mirror of
https://codeberg.org/guix/guix.git
synced 2025-10-02 02:15:12 +00:00
c87a9b855e
At this point the value of 'st.st_mode' is from before canonicalization, so restoring to that will undo the permissions aspect of the canonicalization for a top-level directory store item. Fixes #1104, introduced inae18b3d9e6(ae18b3d9e6). * nix/libstore/build.cc (DerivationGoal::registerOutputs): update 'st' with post-canonicalization permissions before making actualPath temporarily-writable. * tests/store.scm ("build outputs aren't writable"): new test. Change-Id: I5e5eaa79fa6b7f81e1d12fd285883c762a22ce5a Signed-off-by: Ludovic Courtès <ludo@gnu.org>
4413 lines
146 KiB
C++
4413 lines
146 KiB
C++
#include "config.h"
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#include "references.hh"
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#include "pathlocks.hh"
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#include "misc.hh"
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#include "globals.hh"
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#include "local-store.hh"
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#include "util.hh"
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#include "archive.hh"
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#include "affinity.hh"
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#include "builtins.hh"
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#include "spawn.hh"
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#include <map>
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#include <sstream>
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#include <algorithm>
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#include <regex>
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#include <limits.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/utsname.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <cstring>
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#include <stdint.h>
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#include <pwd.h>
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#include <grp.h>
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#include <zlib.h>
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#if HAVE_BZLIB_H
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# include <bzlib.h>
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#endif
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/* Includes required for chroot support. */
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#if HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#if HAVE_SYS_MOUNT_H
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#include <sys/mount.h>
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#endif
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#if HAVE_SYS_SYSCALL_H
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#include <sys/syscall.h>
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#endif
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#if HAVE_SCHED_H
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#include <sched.h>
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#endif
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#if HAVE_SYS_PRCTL_H
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#include <sys/prctl.h>
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#endif
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#if defined(MS_BIND) && defined(MS_PRIVATE)
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#define CHROOT_ENABLED HAVE_CHROOT && HAVE_SYS_MOUNT_H
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#else
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#define CHROOT_ENABLED 0
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#endif
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#if defined(CLONE_NEWNS)
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#define CLONE_ENABLED 1
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#else
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#define CLONE_ENABLED 0
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#endif
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#if defined(SYS_pivot_root)
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#define pivot_root(new_root, put_old) (syscall(SYS_pivot_root, new_root,put_old))
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#endif
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#if CHROOT_ENABLED
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <net/route.h>
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#include <arpa/inet.h>
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#if __linux__
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#include <linux/if_tun.h>
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/* This header isn't documented in 'man netdevice', but there doesn't seem to
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be any other way to get 'struct in6_ifreq'... */
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#include <linux/ipv6.h>
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#include <linux/filter.h>
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#include <linux/seccomp.h>
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#include <seccomp.hh>
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/* Set to 1 to debug the seccomp filter. */
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#define DEBUG_SECCOMP_FILTER 0
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#endif
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#endif
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#if __linux__
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#include <sys/personality.h>
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#endif
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#if HAVE_STATVFS
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#include <sys/statvfs.h>
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#endif
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namespace nix {
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using std::map;
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/* Forward definition. */
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class Worker;
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/* A pointer to a goal. */
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class Goal;
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class DerivationGoal;
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typedef std::shared_ptr<Goal> GoalPtr;
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typedef std::weak_ptr<Goal> WeakGoalPtr;
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struct CompareGoalPtrs {
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bool operator() (const GoalPtr & a, const GoalPtr & b) const;
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};
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/* Set of goals. */
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typedef set<GoalPtr, CompareGoalPtrs> Goals;
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typedef list<WeakGoalPtr> WeakGoals;
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/* A map of paths to goals (and the other way around). */
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typedef map<Path, WeakGoalPtr> WeakGoalMap;
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class Goal : public std::enable_shared_from_this<Goal>
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{
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public:
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typedef enum {ecBusy, ecSuccess, ecFailed, ecNoSubstituters, ecIncompleteClosure} ExitCode;
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protected:
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/* Backlink to the worker. */
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Worker & worker;
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/* Goals that this goal is waiting for. */
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Goals waitees;
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/* Goals waiting for this one to finish. Must use weak pointers
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here to prevent cycles. */
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WeakGoals waiters;
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/* Number of goals we are/were waiting for that have failed. */
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unsigned int nrFailed;
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/* Number of substitution goals we are/were waiting for that
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failed because there are no substituters. */
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unsigned int nrNoSubstituters;
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/* Number of substitution goals we are/were waiting for that
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failed because othey had unsubstitutable references. */
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unsigned int nrIncompleteClosure;
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/* Name of this goal for debugging purposes. */
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string name;
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/* Whether the goal is finished. */
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ExitCode exitCode;
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Goal(Worker & worker) : worker(worker)
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{
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nrFailed = nrNoSubstituters = nrIncompleteClosure = 0;
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exitCode = ecBusy;
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}
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virtual ~Goal()
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{
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trace("goal destroyed");
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}
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public:
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virtual void work() = 0;
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void addWaitee(GoalPtr waitee);
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virtual void waiteeDone(GoalPtr waitee, ExitCode result);
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virtual void handleChildOutput(int fd, const string & data)
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{
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abort();
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}
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virtual void handleEOF(int fd)
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{
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abort();
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}
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void trace(const format & f);
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string getName()
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{
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return name;
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}
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ExitCode getExitCode()
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{
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return exitCode;
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}
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/* Callback in case of a timeout. It should wake up its waiters,
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get rid of any running child processes that are being monitored
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by the worker (important!), etc. */
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virtual void timedOut() = 0;
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virtual string key() = 0;
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protected:
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void amDone(ExitCode result);
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};
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bool CompareGoalPtrs::operator() (const GoalPtr & a, const GoalPtr & b) const {
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string s1 = a->key();
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string s2 = b->key();
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return s1 < s2;
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}
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/* A mapping used to remember for each child process to what goal it
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belongs, and file descriptors for receiving log data and output
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path creation commands. */
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struct Child
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{
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WeakGoalPtr goal;
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set<int> fds;
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bool respectTimeouts;
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bool inBuildSlot;
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time_t lastOutput; /* time we last got output on stdout/stderr */
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time_t timeStarted;
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};
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typedef map<pid_t, Child> Children;
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/* The worker class. */
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class Worker
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{
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private:
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/* Note: the worker should only have strong pointers to the
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top-level goals. */
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/* The top-level goals of the worker. */
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Goals topGoals;
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/* Goals that are ready to do some work. */
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WeakGoals awake;
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/* Goals waiting for a build slot. */
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WeakGoals wantingToBuild;
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/* Child processes currently running. */
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Children children;
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/* Number of build slots occupied. This includes local builds and
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substitutions but not remote builds via the build hook. */
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unsigned int nrLocalBuilds;
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/* Maps used to prevent multiple instantiations of a goal for the
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same derivation / path. */
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WeakGoalMap derivationGoals;
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WeakGoalMap substitutionGoals;
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/* Goals waiting for busy paths to be unlocked. */
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WeakGoals waitingForAnyGoal;
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/* Goals sleeping for a few seconds (polling a lock). */
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WeakGoals waitingForAWhile;
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/* Last time the goals in `waitingForAWhile' where woken up. */
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time_t lastWokenUp;
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public:
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/* Set if at least one derivation had a BuildError (i.e. permanent
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failure). */
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bool permanentFailure;
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/* Set if at least one derivation had a timeout. */
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bool timedOut;
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LocalStore & store;
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std::shared_ptr<Agent> hook;
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std::shared_ptr<Agent> substituter;
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Worker(LocalStore & store);
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~Worker();
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/* Make a goal (with caching). */
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GoalPtr makeDerivationGoal(const Path & drvPath, const StringSet & wantedOutputs, BuildMode buildMode = bmNormal);
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GoalPtr makeSubstitutionGoal(const Path & storePath, bool repair = false);
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/* Remove a dead goal. */
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void removeGoal(GoalPtr goal);
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/* Wake up a goal (i.e., there is something for it to do). */
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void wakeUp(GoalPtr goal);
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/* Return the number of local build and substitution processes
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currently running (but not remote builds via the build
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hook). */
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unsigned int getNrLocalBuilds();
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/* Registers a running child process. `inBuildSlot' means that
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the process counts towards the jobs limit. */
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void childStarted(GoalPtr goal, pid_t pid,
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const set<int> & fds, bool inBuildSlot, bool respectTimeouts);
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/* Unregisters a running child process. `wakeSleepers' should be
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false if there is no sense in waking up goals that are sleeping
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because they can't run yet (e.g., there is no free build slot,
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or the hook would still say `postpone'). */
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void childTerminated(pid_t pid, bool wakeSleepers = true);
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/* Put `goal' to sleep until a build slot becomes available (which
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might be right away). */
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void waitForBuildSlot(GoalPtr goal);
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/* Wait for any goal to finish. Pretty indiscriminate way to
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wait for some resource that some other goal is holding. */
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void waitForAnyGoal(GoalPtr goal);
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/* Wait for a few seconds and then retry this goal. Used when
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waiting for a lock held by another process. This kind of
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polling is inefficient, but POSIX doesn't really provide a way
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to wait for multiple locks in the main select() loop. */
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void waitForAWhile(GoalPtr goal);
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/* Loop until the specified top-level goals have finished. */
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void run(const Goals & topGoals);
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/* Wait for input to become available. */
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void waitForInput();
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unsigned int exitStatus();
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};
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//////////////////////////////////////////////////////////////////////
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void addToWeakGoals(WeakGoals & goals, GoalPtr p)
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{
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// FIXME: necessary?
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// FIXME: O(n)
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bool b = std::none_of(goals.begin(), goals.end(),
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[p](WeakGoalPtr i) { return i.lock() == p; });
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if (b) goals.push_back(p); else return;
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}
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void Goal::addWaitee(GoalPtr waitee)
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{
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waitees.insert(waitee);
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addToWeakGoals(waitee->waiters, shared_from_this());
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}
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void Goal::waiteeDone(GoalPtr waitee, ExitCode result)
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{
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assert(waitees.find(waitee) != waitees.end());
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waitees.erase(waitee);
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trace(format("waitee `%1%' done; %2% left") %
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waitee->name % waitees.size());
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if (result == ecFailed || result == ecNoSubstituters || result == ecIncompleteClosure) ++nrFailed;
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if (result == ecNoSubstituters) ++nrNoSubstituters;
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if (result == ecIncompleteClosure) ++nrIncompleteClosure;
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if (waitees.empty() || (result == ecFailed && !settings.keepGoing)) {
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/* If we failed and keepGoing is not set, we remove all
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remaining waitees. */
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for (auto& i : waitees) {
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GoalPtr goal = i;
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WeakGoals waiters2;
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for (auto& j : goal->waiters)
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if (j.lock() != shared_from_this()) waiters2.push_back(j);
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goal->waiters = waiters2;
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}
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waitees.clear();
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worker.wakeUp(shared_from_this());
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}
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}
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void Goal::amDone(ExitCode result)
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{
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trace("done");
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assert(exitCode == ecBusy);
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assert(result == ecSuccess || result == ecFailed || result == ecNoSubstituters || result == ecIncompleteClosure);
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exitCode = result;
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for (auto& i : waiters) {
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GoalPtr goal = i.lock();
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if (goal) goal->waiteeDone(shared_from_this(), result);
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}
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waiters.clear();
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worker.removeGoal(shared_from_this());
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}
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void Goal::trace(const format & f)
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{
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debug(format("%1%: %2%") % name % f);
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}
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//////////////////////////////////////////////////////////////////////
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class UserLock
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{
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private:
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/* POSIX locks suck. If we have a lock on a file, and we open and
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close that file again (without closing the original file
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descriptor), we lose the lock. So we have to be *very* careful
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not to open a lock file on which we are holding a lock. */
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static PathSet lockedPaths; /* !!! not thread-safe */
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Path fnUserLock;
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AutoCloseFD fdUserLock;
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string user;
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uid_t uid;
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gid_t gid;
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std::vector<gid_t> supplementaryGIDs;
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public:
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UserLock();
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~UserLock();
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void acquire();
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void release();
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void kill();
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string getUser() { return user; }
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uid_t getUID() { return uid; }
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uid_t getGID() { return gid; }
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std::vector<gid_t> getSupplementaryGIDs() { return supplementaryGIDs; }
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bool enabled() { return uid != 0; }
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};
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PathSet UserLock::lockedPaths;
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UserLock::UserLock()
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{
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uid = gid = 0;
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}
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UserLock::~UserLock()
|
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{
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release();
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}
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void UserLock::acquire()
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{
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assert(uid == 0);
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|
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assert(settings.buildUsersGroup != "");
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|
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/* Get the members of the build-users-group. */
|
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struct group * gr = getgrnam(settings.buildUsersGroup.c_str());
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if (!gr)
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throw Error(format("the group `%1%' specified in `build-users-group' does not exist")
|
||
% settings.buildUsersGroup);
|
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gid = gr->gr_gid;
|
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|
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/* Copy the result of getgrnam. */
|
||
Strings users;
|
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for (char * * p = gr->gr_mem; *p; ++p) {
|
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debug(format("found build user `%1%'") % *p);
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users.push_back(*p);
|
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}
|
||
|
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if (users.empty())
|
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throw Error(format("the build users group `%1%' has no members")
|
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% settings.buildUsersGroup);
|
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|
||
/* Find a user account that isn't currently in use for another
|
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build. */
|
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for (auto& i : users) {
|
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debug(format("trying user `%1%'") % i);
|
||
|
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struct passwd * pw = getpwnam(i.c_str());
|
||
if (!pw)
|
||
throw Error(format("the user `%1%' in the group `%2%' does not exist")
|
||
% i % settings.buildUsersGroup);
|
||
|
||
createDirs(settings.nixStateDir + "/userpool");
|
||
|
||
fnUserLock = (format("%1%/userpool/%2%") % settings.nixStateDir % pw->pw_uid).str();
|
||
|
||
if (lockedPaths.find(fnUserLock) != lockedPaths.end())
|
||
/* We already have a lock on this one. */
|
||
continue;
|
||
|
||
AutoCloseFD fd = open(fnUserLock.c_str(), O_RDWR | O_CREAT, 0600);
|
||
if (fd == -1)
|
||
throw SysError(format("opening user lock `%1%'") % fnUserLock);
|
||
closeOnExec(fd);
|
||
|
||
if (lockFile(fd, ltWrite, false)) {
|
||
fdUserLock = fd.borrow();
|
||
lockedPaths.insert(fnUserLock);
|
||
user = i;
|
||
uid = pw->pw_uid;
|
||
|
||
/* Sanity check... */
|
||
if (uid == getuid() || uid == geteuid())
|
||
throw Error(format("the build user should not be a member of `%1%'")
|
||
% settings.buildUsersGroup);
|
||
|
||
/* Get the list of supplementary groups of this build user. This
|
||
is usually either empty or contains a group such as "kvm". */
|
||
supplementaryGIDs.resize(10);
|
||
int ngroups = supplementaryGIDs.size();
|
||
int err = getgrouplist(pw->pw_name, pw->pw_gid,
|
||
supplementaryGIDs.data(), &ngroups);
|
||
if (err == -1)
|
||
throw Error(format("failed to get list of supplementary groups for ‘%1%’") % pw->pw_name);
|
||
|
||
supplementaryGIDs.resize(ngroups);
|
||
|
||
return;
|
||
}
|
||
}
|
||
|
||
throw Error(format("all build users are currently in use; "
|
||
"consider creating additional users and adding them to the `%1%' group")
|
||
% settings.buildUsersGroup);
|
||
}
|
||
|
||
|
||
void UserLock::release()
|
||
{
|
||
if (uid == 0) return;
|
||
fdUserLock.close(); /* releases lock */
|
||
assert(lockedPaths.find(fnUserLock) != lockedPaths.end());
|
||
lockedPaths.erase(fnUserLock);
|
||
fnUserLock = "";
|
||
uid = 0;
|
||
}
|
||
|
||
|
||
void UserLock::kill()
|
||
{
|
||
assert(enabled());
|
||
killUser(uid);
|
||
}
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
typedef map<string, string> HashRewrites;
|
||
|
||
|
||
string rewriteHashes(string s, const HashRewrites & rewrites)
|
||
{
|
||
for (auto& i : rewrites) {
|
||
assert(i.first.size() == i.second.size());
|
||
size_t j = 0;
|
||
while ((j = s.find(i.first, j)) != string::npos) {
|
||
debug(format("rewriting @ %1%") % j);
|
||
s.replace(j, i.second.size(), i.second);
|
||
}
|
||
}
|
||
return s;
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
typedef enum {rpAccept, rpDecline, rpPostpone} HookReply;
|
||
|
||
class SubstitutionGoal;
|
||
|
||
class DerivationGoal : public Goal
|
||
{
|
||
private:
|
||
/* The path of the derivation. */
|
||
Path drvPath;
|
||
|
||
/* The specific outputs that we need to build. Empty means all of
|
||
them. */
|
||
StringSet wantedOutputs;
|
||
|
||
/* Whether additional wanted outputs have been added. */
|
||
bool needRestart;
|
||
|
||
/* Whether to retry substituting the outputs after building the
|
||
inputs. */
|
||
bool retrySubstitution;
|
||
|
||
/* The derivation stored at drvPath. */
|
||
Derivation drv;
|
||
|
||
/* The remainder is state held during the build. */
|
||
|
||
/* Locks on the output paths. */
|
||
PathLocks outputLocks;
|
||
|
||
/* All input paths (that is, the union of FS closures of the
|
||
immediate input paths). */
|
||
PathSet inputPaths;
|
||
|
||
/* Referenceable paths (i.e., input and output paths). */
|
||
PathSet allPaths;
|
||
|
||
/* Outputs that are already valid. If we're repairing, these are
|
||
the outputs that are valid *and* not corrupt. */
|
||
PathSet validPaths;
|
||
|
||
/* Outputs that are corrupt or not valid. */
|
||
PathSet missingPaths;
|
||
|
||
/* User selected for running the builder. */
|
||
UserLock buildUser;
|
||
|
||
/* The process ID of the builder. */
|
||
Pid pid;
|
||
|
||
/* The temporary directory. */
|
||
Path tmpDir;
|
||
|
||
/* The path of the temporary directory in the sandbox. */
|
||
Path tmpDirInSandbox;
|
||
|
||
/* File descriptor for the log file. */
|
||
FILE * fLogFile;
|
||
gzFile gzLogFile;
|
||
#if HAVE_BZLIB_H
|
||
BZFILE * bzLogFile;
|
||
#endif
|
||
AutoCloseFD fdLogFile;
|
||
|
||
/* Number of bytes received from the builder's stdout/stderr. */
|
||
unsigned long logSize;
|
||
|
||
/* Pipe for the builder's standard output/error. */
|
||
Pipe builderOut;
|
||
|
||
/* The build hook. */
|
||
std::shared_ptr<Agent> hook;
|
||
|
||
/* Whether we're currently doing a chroot build. */
|
||
bool useChroot;
|
||
|
||
/* The directory containing the chroot root directory, and the chroot root
|
||
directory itself--the latter is a sub-directory of the former. */
|
||
Path chrootRootTop, chrootRootDir;
|
||
|
||
/* RAII object to delete the chroot directory. */
|
||
std::shared_ptr<AutoDelete> autoDelChroot;
|
||
|
||
/* Whether this is a fixed-output derivation. */
|
||
bool fixedOutput;
|
||
|
||
/* PID of the 'slirp4netns' process in case of a fixed-output
|
||
derivation. */
|
||
Pid slirp;
|
||
|
||
typedef void (DerivationGoal::*GoalState)();
|
||
GoalState state;
|
||
|
||
/* Hash rewriting. */
|
||
HashRewrites rewritesToTmp, rewritesFromTmp;
|
||
typedef map<Path, Path> RedirectedOutputs;
|
||
RedirectedOutputs redirectedOutputs;
|
||
|
||
BuildMode buildMode;
|
||
|
||
/* If we're repairing without a chroot, there may be outputs that
|
||
are valid but corrupt. So we redirect these outputs to
|
||
temporary paths. */
|
||
PathSet redirectedBadOutputs;
|
||
|
||
/* The current round, if we're building multiple times. */
|
||
unsigned int curRound = 1;
|
||
|
||
unsigned int nrRounds;
|
||
|
||
/* Path registration info from the previous round, if we're
|
||
building multiple times. Since this contains the hash, it
|
||
allows us to compare whether two rounds produced the same
|
||
result. */
|
||
ValidPathInfos prevInfos;
|
||
|
||
BuildResult result;
|
||
|
||
public:
|
||
DerivationGoal(const Path & drvPath, const StringSet & wantedOutputs, Worker & worker, BuildMode buildMode = bmNormal);
|
||
~DerivationGoal();
|
||
|
||
void timedOut() override;
|
||
|
||
string key()
|
||
{
|
||
/* Ensure that derivations get built in order of their name,
|
||
i.e. a derivation named "aardvark" always comes before
|
||
"baboon". And substitution goals always happen before
|
||
derivation goals (due to "b$"). */
|
||
return "b$" + storePathToName(drvPath) + "$" + drvPath;
|
||
}
|
||
|
||
void work();
|
||
|
||
Path getDrvPath()
|
||
{
|
||
return drvPath;
|
||
}
|
||
|
||
/* Add wanted outputs to an already existing derivation goal. */
|
||
void addWantedOutputs(const StringSet & outputs);
|
||
|
||
BuildResult getResult() { return result; }
|
||
|
||
private:
|
||
/* The states. */
|
||
void init();
|
||
void haveDerivation();
|
||
void outputsSubstituted();
|
||
void closureRepaired();
|
||
void inputsRealised();
|
||
void tryToBuild();
|
||
void buildDone();
|
||
|
||
/* Is the build hook willing to perform the build? */
|
||
HookReply tryBuildHook();
|
||
|
||
/* Start building a derivation. */
|
||
void startBuilder();
|
||
|
||
void execBuilderOrBuiltin(SpawnContext &);
|
||
|
||
friend void execBuilderOrBuiltinAction(SpawnContext &);
|
||
|
||
/* Check that the derivation outputs all exist and register them
|
||
as valid. */
|
||
void registerOutputs();
|
||
|
||
/* Open a log file and a pipe to it. */
|
||
Path openLogFile();
|
||
|
||
/* Close the log file. */
|
||
void closeLogFile();
|
||
|
||
/* Delete the temporary directory, if we have one. */
|
||
void deleteTmpDir(bool force);
|
||
|
||
/* Callback used by the worker to write to the log. */
|
||
void handleChildOutput(int fd, const string & data);
|
||
void handleEOF(int fd);
|
||
|
||
/* Return the set of (in)valid paths. */
|
||
PathSet checkPathValidity(bool returnValid, bool checkHash);
|
||
|
||
/* Abort the goal if `path' failed to build. */
|
||
bool pathFailed(const Path & path);
|
||
|
||
/* Forcibly kill the child process, if any. */
|
||
void killChild();
|
||
|
||
Path addHashRewrite(const Path & path);
|
||
|
||
void repairClosure();
|
||
|
||
void done(BuildResult::Status status, const string & msg = "");
|
||
};
|
||
|
||
|
||
DerivationGoal::DerivationGoal(const Path & drvPath, const StringSet & wantedOutputs, Worker & worker, BuildMode buildMode)
|
||
: Goal(worker)
|
||
, wantedOutputs(wantedOutputs)
|
||
, needRestart(false)
|
||
, retrySubstitution(false)
|
||
, fLogFile(0)
|
||
, gzLogFile(0)
|
||
#if HAVE_BZLIB_H
|
||
, bzLogFile(0)
|
||
#endif
|
||
, useChroot(false)
|
||
, buildMode(buildMode)
|
||
{
|
||
this->drvPath = drvPath;
|
||
state = &DerivationGoal::init;
|
||
name = (format("building of `%1%'") % drvPath).str();
|
||
trace("created");
|
||
|
||
/* Prevent the .chroot directory from being
|
||
garbage-collected. (See isActiveTempFile() in gc.cc.) */
|
||
worker.store.addTempRoot(drvPath);
|
||
}
|
||
|
||
|
||
DerivationGoal::~DerivationGoal()
|
||
{
|
||
/* Careful: we should never ever throw an exception from a
|
||
destructor. */
|
||
try { killChild(); } catch (...) { ignoreException(); }
|
||
try { deleteTmpDir(false); } catch (...) { ignoreException(); }
|
||
try { closeLogFile(); } catch (...) { ignoreException(); }
|
||
}
|
||
|
||
|
||
void DerivationGoal::killChild()
|
||
{
|
||
if (pid != -1) {
|
||
worker.childTerminated(pid);
|
||
|
||
if (buildUser.enabled()) {
|
||
/* If we're using a build user, then there is a tricky
|
||
race condition: if we kill the build user before the
|
||
child has done its setuid() to the build user uid, then
|
||
it won't be killed, and we'll potentially lock up in
|
||
pid.wait(). So also send a conventional kill to the
|
||
child. */
|
||
::kill(-pid, SIGKILL); /* ignore the result */
|
||
buildUser.kill();
|
||
pid.wait(true);
|
||
} else
|
||
pid.kill();
|
||
|
||
assert(pid == -1);
|
||
}
|
||
|
||
/* If there was a build hook involved, remove it from the worker's
|
||
children. */
|
||
if (hook && hook->pid != -1) {
|
||
worker.childTerminated(hook->pid);
|
||
}
|
||
hook.reset();
|
||
|
||
if (slirp != -1)
|
||
/* Terminate the 'slirp4netns' process. */
|
||
slirp.kill();
|
||
}
|
||
|
||
|
||
void DerivationGoal::timedOut()
|
||
{
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ build-failed %1% - timeout") % drvPath);
|
||
killChild();
|
||
done(BuildResult::TimedOut);
|
||
}
|
||
|
||
|
||
void DerivationGoal::work()
|
||
{
|
||
(this->*state)();
|
||
}
|
||
|
||
|
||
void DerivationGoal::addWantedOutputs(const StringSet & outputs)
|
||
{
|
||
/* If we already want all outputs, there is nothing to do. */
|
||
if (wantedOutputs.empty()) return;
|
||
|
||
if (outputs.empty()) {
|
||
wantedOutputs.clear();
|
||
needRestart = true;
|
||
} else
|
||
for (const auto& i : outputs)
|
||
if (wantedOutputs.find(i) == wantedOutputs.end()) {
|
||
wantedOutputs.insert(i);
|
||
needRestart = true;
|
||
}
|
||
}
|
||
|
||
|
||
void DerivationGoal::init()
|
||
{
|
||
trace("init");
|
||
|
||
if (settings.readOnlyMode)
|
||
throw Error(format("cannot build derivation `%1%' - no write access to the store") % drvPath);
|
||
|
||
/* The first thing to do is to make sure that the derivation
|
||
exists. If it doesn't, it may be created through a
|
||
substitute. */
|
||
if (buildMode == bmNormal && worker.store.isValidPath(drvPath)) {
|
||
haveDerivation();
|
||
return;
|
||
}
|
||
|
||
addWaitee(worker.makeSubstitutionGoal(drvPath));
|
||
|
||
state = &DerivationGoal::haveDerivation;
|
||
}
|
||
|
||
|
||
void DerivationGoal::haveDerivation()
|
||
{
|
||
trace("loading derivation");
|
||
|
||
if (nrFailed != 0) {
|
||
printMsg(lvlError, format("cannot build missing derivation ‘%1%’") % drvPath);
|
||
done(BuildResult::MiscFailure);
|
||
return;
|
||
}
|
||
|
||
/* `drvPath' should already be a root, but let's be on the safe
|
||
side: if the user forgot to make it a root, we wouldn't want
|
||
things being garbage collected while we're busy. */
|
||
worker.store.addTempRoot(drvPath);
|
||
|
||
assert(worker.store.isValidPath(drvPath));
|
||
|
||
/* Get the derivation. */
|
||
drv = derivationFromPath(worker.store, drvPath);
|
||
|
||
for (auto& i : drv.outputs)
|
||
worker.store.addTempRoot(i.second.path);
|
||
|
||
/* Check what outputs paths are not already valid. */
|
||
PathSet invalidOutputs = checkPathValidity(false, buildMode == bmRepair);
|
||
|
||
/* If they are all valid, then we're done. */
|
||
if (invalidOutputs.size() == 0 && buildMode == bmNormal) {
|
||
done(BuildResult::AlreadyValid);
|
||
return;
|
||
}
|
||
|
||
/* Check whether any output previously failed to build. If so,
|
||
don't bother. */
|
||
for (auto& i : invalidOutputs)
|
||
if (pathFailed(i)) return;
|
||
|
||
/* We are first going to try to create the invalid output paths
|
||
through substitutes. If that doesn't work, we'll build
|
||
them. */
|
||
if (settings.useSubstitutes && substitutesAllowed(drv))
|
||
for (auto& i : invalidOutputs)
|
||
addWaitee(worker.makeSubstitutionGoal(i, buildMode == bmRepair));
|
||
|
||
if (waitees.empty()) /* to prevent hang (no wake-up event) */
|
||
outputsSubstituted();
|
||
else
|
||
state = &DerivationGoal::outputsSubstituted;
|
||
}
|
||
|
||
|
||
void DerivationGoal::outputsSubstituted()
|
||
{
|
||
trace("all outputs substituted (maybe)");
|
||
|
||
if (nrFailed > 0 && nrFailed > nrNoSubstituters + nrIncompleteClosure && !settings.tryFallback)
|
||
throw Error(format("some substitutes for the outputs of derivation `%1%' failed (usually happens due to networking issues); try `--fallback' to build derivation from source ") % drvPath);
|
||
|
||
/* If the substitutes form an incomplete closure, then we should
|
||
build the dependencies of this derivation, but after that, we
|
||
can still use the substitutes for this derivation itself. */
|
||
if (nrIncompleteClosure > 0 && !retrySubstitution) retrySubstitution = true;
|
||
|
||
nrFailed = nrNoSubstituters = nrIncompleteClosure = 0;
|
||
|
||
if (needRestart) {
|
||
needRestart = false;
|
||
haveDerivation();
|
||
return;
|
||
}
|
||
|
||
unsigned int nrInvalid = checkPathValidity(false, buildMode == bmRepair).size();
|
||
if (buildMode == bmNormal && nrInvalid == 0) {
|
||
done(BuildResult::Substituted);
|
||
return;
|
||
}
|
||
if (buildMode == bmRepair && nrInvalid == 0) {
|
||
repairClosure();
|
||
return;
|
||
}
|
||
if (buildMode == bmCheck && nrInvalid > 0)
|
||
throw Error(format("`%1%' is missing outputs; build it normally before using `--check'") % drvPath);
|
||
|
||
/* Otherwise, at least one of the output paths could not be
|
||
produced using a substitute. So we have to build instead. */
|
||
|
||
/* Make sure checkPathValidity() from now on checks all
|
||
outputs. */
|
||
wantedOutputs = PathSet();
|
||
|
||
/* The inputs must be built before we can build this goal. */
|
||
for (auto& i : drv.inputDrvs)
|
||
addWaitee(worker.makeDerivationGoal(i.first, i.second, buildMode == bmRepair ? bmRepair : bmNormal));
|
||
|
||
for (auto& i : drv.inputSrcs)
|
||
addWaitee(worker.makeSubstitutionGoal(i));
|
||
|
||
if (waitees.empty()) /* to prevent hang (no wake-up event) */
|
||
inputsRealised();
|
||
else
|
||
state = &DerivationGoal::inputsRealised;
|
||
}
|
||
|
||
|
||
void DerivationGoal::repairClosure()
|
||
{
|
||
/* If we're repairing, we now know that our own outputs are valid.
|
||
Now check whether the other paths in the outputs closure are
|
||
good. If not, then start derivation goals for the derivations
|
||
that produced those outputs. */
|
||
|
||
/* Get the output closure. */
|
||
PathSet outputClosure;
|
||
for (auto& i : drv.outputs) {
|
||
if (!wantOutput(i.first, wantedOutputs)) continue;
|
||
computeFSClosure(worker.store, i.second.path, outputClosure);
|
||
}
|
||
|
||
/* Filter out our own outputs (which we have already checked). */
|
||
for (auto& i : drv.outputs)
|
||
outputClosure.erase(i.second.path);
|
||
|
||
/* Get all dependencies of this derivation so that we know which
|
||
derivation is responsible for which path in the output
|
||
closure. */
|
||
PathSet inputClosure;
|
||
computeFSClosure(worker.store, drvPath, inputClosure);
|
||
std::map<Path, Path> outputsToDrv;
|
||
for (auto& i : inputClosure)
|
||
if (isDerivation(i)) {
|
||
Derivation drv = derivationFromPath(worker.store, i);
|
||
for (auto& j : drv.outputs)
|
||
outputsToDrv[j.second.path] = i;
|
||
}
|
||
|
||
/* Check each path (slow!). */
|
||
PathSet broken;
|
||
for (auto& i : outputClosure) {
|
||
if (worker.store.pathContentsGood(i)) continue;
|
||
printMsg(lvlError, format("found corrupted or missing path `%1%' in the output closure of `%2%'") % i % drvPath);
|
||
Path drvPath2 = outputsToDrv[i];
|
||
if (drvPath2 == "")
|
||
addWaitee(worker.makeSubstitutionGoal(i, true));
|
||
else
|
||
addWaitee(worker.makeDerivationGoal(drvPath2, PathSet(), bmRepair));
|
||
}
|
||
|
||
if (waitees.empty()) {
|
||
done(BuildResult::AlreadyValid);
|
||
return;
|
||
}
|
||
|
||
state = &DerivationGoal::closureRepaired;
|
||
}
|
||
|
||
|
||
void DerivationGoal::closureRepaired()
|
||
{
|
||
trace("closure repaired");
|
||
if (nrFailed > 0)
|
||
throw Error(format("some paths in the output closure of derivation ‘%1%’ could not be repaired") % drvPath);
|
||
done(BuildResult::AlreadyValid);
|
||
}
|
||
|
||
|
||
void DerivationGoal::inputsRealised()
|
||
{
|
||
trace("all inputs realised");
|
||
|
||
if (nrFailed != 0) {
|
||
printMsg(lvlError,
|
||
format("cannot build derivation `%1%': %2% dependencies couldn't be built")
|
||
% drvPath % nrFailed);
|
||
done(BuildResult::DependencyFailed);
|
||
return;
|
||
}
|
||
|
||
if (retrySubstitution) {
|
||
haveDerivation();
|
||
return;
|
||
}
|
||
|
||
/* Gather information necessary for computing the closure and/or
|
||
running the build hook. */
|
||
|
||
/* The outputs are referenceable paths. */
|
||
for (auto& i : drv.outputs) {
|
||
debug(format("building path `%1%'") % i.second.path);
|
||
allPaths.insert(i.second.path);
|
||
}
|
||
|
||
/* Determine the full set of input paths. */
|
||
|
||
/* First, the input derivations. */
|
||
for (auto& i : drv.inputDrvs) {
|
||
/* Add the relevant output closures of the input derivation
|
||
`*i' as input paths. Only add the closures of output paths
|
||
that are specified as inputs. */
|
||
assert(worker.store.isValidPath(i.first));
|
||
Derivation inDrv = derivationFromPath(worker.store, i.first);
|
||
for (auto& j : i.second)
|
||
if (inDrv.outputs.find(j) != inDrv.outputs.end())
|
||
computeFSClosure(worker.store, inDrv.outputs[j].path, inputPaths);
|
||
else
|
||
throw Error(
|
||
format("derivation `%1%' requires non-existent output `%2%' from input derivation `%3%'")
|
||
% drvPath % j % i.first);
|
||
}
|
||
|
||
/* Second, the input sources. */
|
||
for (auto& i : drv.inputSrcs)
|
||
computeFSClosure(worker.store, i, inputPaths);
|
||
|
||
debug(format("added input paths %1%") % showPaths(inputPaths));
|
||
|
||
allPaths.insert(inputPaths.begin(), inputPaths.end());
|
||
|
||
/* Is this a fixed-output derivation? */
|
||
fixedOutput = true;
|
||
for (auto & i : drv.outputs)
|
||
if (i.second.hash == "") fixedOutput = false;
|
||
|
||
/* Don't repeat fixed-output derivations since they're already
|
||
verified by their output hash.*/
|
||
nrRounds = fixedOutput ? 1 : settings.get("build-repeat", 0) + 1;
|
||
|
||
/* Okay, try to build. Note that here we don't wait for a build
|
||
slot to become available, since we don't need one if there is a
|
||
build hook. */
|
||
state = &DerivationGoal::tryToBuild;
|
||
worker.wakeUp(shared_from_this());
|
||
}
|
||
|
||
|
||
static bool canBuildLocally(const string & platform)
|
||
{
|
||
return platform == settings.thisSystem
|
||
#if __linux__
|
||
|| (platform == "i686-linux" && settings.thisSystem == "x86_64-linux")
|
||
|| (platform == "armhf-linux" && settings.thisSystem == "aarch64-linux")
|
||
#endif
|
||
;
|
||
}
|
||
|
||
|
||
static string get(const StringPairs & map, const string & key, const string & def = "")
|
||
{
|
||
StringPairs::const_iterator i = map.find(key);
|
||
return i == map.end() ? def : i->second;
|
||
}
|
||
|
||
|
||
bool willBuildLocally(const Derivation & drv)
|
||
{
|
||
return get(drv.env, "preferLocalBuild") == "1" && canBuildLocally(drv.platform);
|
||
}
|
||
|
||
|
||
bool substitutesAllowed(const Derivation & drv)
|
||
{
|
||
return get(drv.env, "allowSubstitutes", "1") == "1";
|
||
}
|
||
|
||
|
||
void DerivationGoal::tryToBuild()
|
||
{
|
||
trace("trying to build");
|
||
|
||
/* Check for the possibility that some other goal in this process
|
||
has locked the output since we checked in haveDerivation().
|
||
(It can't happen between here and the lockPaths() call below
|
||
because we're not allowing multi-threading.) If so, put this
|
||
goal to sleep until another goal finishes, then try again. */
|
||
for (auto& i : drv.outputs)
|
||
if (pathIsLockedByMe(i.second.path)) {
|
||
debug(format("putting derivation `%1%' to sleep because `%2%' is locked by another goal")
|
||
% drvPath % i.second.path);
|
||
worker.waitForAnyGoal(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
/* Obtain locks on all output paths. The locks are automatically
|
||
released when we exit this function or the client crashes. If we
|
||
can't acquire the lock, then continue; hopefully some other
|
||
goal can start a build, and if not, the main loop will sleep a
|
||
few seconds and then retry this goal. */
|
||
if (!outputLocks.lockPaths(outputPaths(drv), "", false)) {
|
||
worker.waitForAWhile(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
/* Now check again whether the outputs are valid. This is because
|
||
another process may have started building in parallel. After
|
||
it has finished and released the locks, we can (and should)
|
||
reuse its results. (Strictly speaking the first check can be
|
||
omitted, but that would be less efficient.) Note that since we
|
||
now hold the locks on the output paths, no other process can
|
||
build this derivation, so no further checks are necessary. */
|
||
validPaths = checkPathValidity(true, buildMode == bmRepair);
|
||
if (buildMode != bmCheck && validPaths.size() == drv.outputs.size()) {
|
||
debug(format("skipping build of derivation `%1%', someone beat us to it") % drvPath);
|
||
outputLocks.setDeletion(true);
|
||
outputLocks.unlock();
|
||
done(BuildResult::AlreadyValid);
|
||
return;
|
||
}
|
||
|
||
missingPaths = outputPaths(drv);
|
||
if (buildMode != bmCheck)
|
||
for (auto& i : validPaths) missingPaths.erase(i);
|
||
|
||
/* If any of the outputs already exist but are not valid, delete
|
||
them. */
|
||
for (auto& i : drv.outputs) {
|
||
Path path = i.second.path;
|
||
if (worker.store.isValidPath(path)) continue;
|
||
if (!pathExists(path)) continue;
|
||
debug(format("removing invalid path `%1%'") % path);
|
||
deletePath(path);
|
||
}
|
||
|
||
/* Check again whether any output previously failed to build,
|
||
because some other process may have tried and failed before we
|
||
acquired the lock. */
|
||
for (auto& i : drv.outputs)
|
||
if (pathFailed(i.second.path)) return;
|
||
|
||
/* Don't do a remote build if the derivation has the attribute
|
||
`preferLocalBuild' set. Also, check and repair modes are only
|
||
supported for local builds. */
|
||
bool buildLocally = buildMode != bmNormal || willBuildLocally(drv);
|
||
|
||
/* Is the build hook willing to accept this job? */
|
||
if (!buildLocally) {
|
||
switch (tryBuildHook()) {
|
||
case rpAccept:
|
||
/* Yes, it has started doing so. Wait until we get
|
||
EOF from the hook. */
|
||
state = &DerivationGoal::buildDone;
|
||
return;
|
||
case rpPostpone:
|
||
/* Not now; wait until at least one child finishes or
|
||
the wake-up timeout expires. */
|
||
worker.waitForAWhile(shared_from_this());
|
||
outputLocks.unlock();
|
||
return;
|
||
case rpDecline:
|
||
/* We should do it ourselves. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Make sure that we are allowed to start a build. If this
|
||
derivation prefers to be done locally, do it even if
|
||
maxBuildJobs is 0. */
|
||
unsigned int curBuilds = worker.getNrLocalBuilds();
|
||
if (curBuilds >= settings.maxBuildJobs && !(buildLocally && curBuilds == 0)) {
|
||
worker.waitForBuildSlot(shared_from_this());
|
||
outputLocks.unlock();
|
||
return;
|
||
}
|
||
|
||
try {
|
||
|
||
/* Okay, we have to build. */
|
||
startBuilder();
|
||
|
||
} catch (BuildError & e) {
|
||
printMsg(lvlError, e.msg());
|
||
outputLocks.unlock();
|
||
buildUser.release();
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ build-failed %1% - %2% %3%")
|
||
% drvPath % 0 % e.msg());
|
||
worker.permanentFailure = true;
|
||
done(BuildResult::InputRejected, e.msg());
|
||
return;
|
||
}
|
||
|
||
/* This state will be reached when we get EOF on the child's
|
||
log pipe. */
|
||
state = &DerivationGoal::buildDone;
|
||
}
|
||
|
||
|
||
void replaceValidPath(const Path & storePath, const Path tmpPath)
|
||
{
|
||
/* We can't atomically replace storePath (the original) with
|
||
tmpPath (the replacement), so we have to move it out of the
|
||
way first. We'd better not be interrupted here, because if
|
||
we're repairing (say) Glibc, we end up with a broken system. */
|
||
Path oldPath = (format("%1%.old-%2%-%3%") % storePath % getpid() % rand()).str();
|
||
if (pathExists(storePath))
|
||
rename(storePath.c_str(), oldPath.c_str());
|
||
if (rename(tmpPath.c_str(), storePath.c_str()) == -1)
|
||
throw SysError(format("moving `%1%' to `%2%'") % tmpPath % storePath);
|
||
if (pathExists(oldPath))
|
||
deletePath(oldPath);
|
||
}
|
||
|
||
|
||
MakeError(NotDeterministic, BuildError)
|
||
|
||
|
||
/* Recursively make the file permissions of a path safe for exposure to
|
||
arbitrary users, but without canonicalising its permissions, timestamp, and
|
||
user. Throw an exception if a file type that isn't explicitly known to be
|
||
safe is found; when 'allowSpecialFiles' is true, pipes and sockets are
|
||
allowed. */
|
||
static void secureFilePerms(Path path, bool allowSpecialFiles = false)
|
||
{
|
||
struct stat st;
|
||
if (lstat(path.c_str(), &st)) return;
|
||
|
||
switch(st.st_mode & S_IFMT) {
|
||
case S_IFLNK:
|
||
return;
|
||
|
||
case S_IFDIR:
|
||
for (auto & i : readDirectory(path)) {
|
||
secureFilePerms(path + "/" + i.name, allowSpecialFiles);
|
||
}
|
||
/* FALLTHROUGH */
|
||
|
||
case S_IFREG:
|
||
chmod(path.c_str(), (st.st_mode & ~S_IFMT) & ~(S_ISUID | S_ISGID | S_IWOTH));
|
||
break;
|
||
|
||
case S_IFSOCK:
|
||
case S_IFIFO:
|
||
if (allowSpecialFiles) {
|
||
chmod(path.c_str(), (st.st_mode & ~S_IFMT) & ~(S_ISUID | S_ISGID | S_IWOTH));
|
||
break;
|
||
}
|
||
/* FALLTHROUGH */
|
||
|
||
default:
|
||
throw Error(format("file `%1%' has an unsupported type") % path);
|
||
}
|
||
}
|
||
|
||
void DerivationGoal::buildDone()
|
||
{
|
||
trace("build done");
|
||
|
||
/* Since we got an EOF on the logger pipe, the builder is presumed
|
||
to have terminated. In fact, the builder could also have
|
||
simply have closed its end of the pipe --- just don't do that
|
||
:-) */
|
||
int status;
|
||
pid_t savedPid;
|
||
if (hook) {
|
||
savedPid = hook->pid;
|
||
status = hook->pid.wait(true);
|
||
} else {
|
||
/* !!! this could block! security problem! solution: kill the
|
||
child */
|
||
savedPid = pid;
|
||
status = pid.wait(true);
|
||
}
|
||
|
||
debug(format("builder process for `%1%' finished") % drvPath);
|
||
|
||
/* So the child is gone now. */
|
||
worker.childTerminated(savedPid);
|
||
|
||
/* Close the read side of the logger pipe. */
|
||
if (hook) {
|
||
hook->builderOut.readSide.close();
|
||
hook->fromAgent.readSide.close();
|
||
}
|
||
else builderOut.readSide.close();
|
||
|
||
/* Close the log file. */
|
||
closeLogFile();
|
||
|
||
/* When running under a build user, make sure that all processes
|
||
running under that uid are gone. This is to prevent a
|
||
malicious user from leaving behind a process that keeps files
|
||
open and modifies them after they have been chown'ed to
|
||
root. */
|
||
if (buildUser.enabled()) buildUser.kill();
|
||
|
||
bool diskFull = false;
|
||
|
||
try {
|
||
|
||
/* Check the exit status. */
|
||
if (!statusOk(status)) {
|
||
|
||
/* Heuristically check whether the build failure may have
|
||
been caused by a disk full condition. We have no way
|
||
of knowing whether the build actually got an ENOSPC.
|
||
So instead, check if the disk is (nearly) full now. If
|
||
so, we don't mark this build as a permanent failure. */
|
||
#if HAVE_STATVFS
|
||
unsigned long long required = 8ULL * 1024 * 1024; // FIXME: make configurable
|
||
struct statvfs st;
|
||
if (statvfs(settings.nixStore.c_str(), &st) == 0 &&
|
||
(unsigned long long) st.f_bavail * st.f_bsize < required)
|
||
diskFull = true;
|
||
if (statvfs(tmpDir.c_str(), &st) == 0 &&
|
||
(unsigned long long) st.f_bavail * st.f_bsize < required)
|
||
diskFull = true;
|
||
#endif
|
||
|
||
deleteTmpDir(false);
|
||
|
||
/* Move paths out of the chroot for easier debugging of
|
||
build failures. */
|
||
if (useChroot && buildMode == bmNormal)
|
||
for (auto& i : missingPaths)
|
||
if (pathExists(chrootRootDir + i)) {
|
||
try {
|
||
secureFilePerms(chrootRootDir + i);
|
||
rename((chrootRootDir + i).c_str(), i.c_str());
|
||
} catch(Error & e) {
|
||
printMsg(lvlError, e.msg());
|
||
}
|
||
}
|
||
|
||
if (diskFull)
|
||
printMsg(lvlError, "note: build failure may have been caused by lack of free disk space");
|
||
|
||
throw BuildError(format("builder for `%1%' %2%")
|
||
% drvPath % statusToString(status));
|
||
}
|
||
|
||
if (fixedOutput) {
|
||
/* Replace the output, if it exists, by a fresh copy of itself to
|
||
make sure that there's no stale file descriptor pointing to it
|
||
(CVE-2024-27297). */
|
||
for (auto& i : drv.outputs) {
|
||
Path output = chrootRootDir + i.second.path;
|
||
if (pathExists(output)) {
|
||
Path pivot = output + ".tmp";
|
||
copyFileRecursively(output, pivot, true);
|
||
int err = rename(pivot.c_str(), output.c_str());
|
||
if (err != 0)
|
||
throw SysError(format("renaming `%1%' to `%2%'")
|
||
% pivot % output);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Compute the FS closure of the outputs and register them as
|
||
being valid. */
|
||
registerOutputs();
|
||
|
||
/* Delete unused redirected outputs (when doing hash rewriting). */
|
||
for (auto& i : redirectedOutputs)
|
||
if (pathExists(i.second)) deletePath(i.second);
|
||
|
||
/* Delete the chroot (if we were using one). */
|
||
autoDelChroot.reset(); /* this runs the destructor */
|
||
|
||
deleteTmpDir(true);
|
||
|
||
/* Repeat the build if necessary. */
|
||
if (curRound++ < nrRounds) {
|
||
outputLocks.unlock();
|
||
buildUser.release();
|
||
state = &DerivationGoal::tryToBuild;
|
||
worker.wakeUp(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
/* It is now safe to delete the lock files, since all future
|
||
lockers will see that the output paths are valid; they will
|
||
not create new lock files with the same names as the old
|
||
(unlinked) lock files. */
|
||
outputLocks.setDeletion(true);
|
||
outputLocks.unlock();
|
||
|
||
} catch (BuildError & e) {
|
||
if (!hook)
|
||
printMsg(lvlError, e.msg());
|
||
outputLocks.unlock();
|
||
buildUser.release();
|
||
|
||
BuildResult::Status st = BuildResult::MiscFailure;
|
||
|
||
if (hook && WIFEXITED(status) && WEXITSTATUS(status) == 101) {
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ build-failed %1% - timeout") % drvPath);
|
||
st = BuildResult::TimedOut;
|
||
}
|
||
|
||
else if (hook && (!WIFEXITED(status) || WEXITSTATUS(status) != 100)) {
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ hook-failed %1% - %2% %3%")
|
||
% drvPath % status % e.msg());
|
||
}
|
||
|
||
else {
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ build-failed %1% - %2% %3%")
|
||
% drvPath % 1 % e.msg());
|
||
|
||
st =
|
||
statusOk(status) ? BuildResult::OutputRejected :
|
||
fixedOutput || diskFull ? BuildResult::TransientFailure :
|
||
BuildResult::PermanentFailure;
|
||
|
||
/* Register the outputs of this build as "failed" so we
|
||
won't try to build them again (negative caching).
|
||
However, don't do this for fixed-output derivations,
|
||
since they're likely to fail for transient reasons
|
||
(e.g., fetchurl not being able to access the network).
|
||
Hook errors (like communication problems with the
|
||
remote machine) shouldn't be cached either. */
|
||
if (settings.cacheFailure && !fixedOutput && !diskFull)
|
||
for (auto& i : drv.outputs)
|
||
worker.store.registerFailedPath(i.second.path);
|
||
}
|
||
|
||
done(st, e.msg());
|
||
return;
|
||
}
|
||
|
||
/* Release the build user, if applicable. */
|
||
buildUser.release();
|
||
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ build-succeeded %1% -") % drvPath);
|
||
|
||
done(BuildResult::Built);
|
||
}
|
||
|
||
|
||
HookReply DerivationGoal::tryBuildHook()
|
||
{
|
||
if (!settings.useBuildHook) return rpDecline;
|
||
|
||
if (!worker.hook) {
|
||
Strings args = {
|
||
"offload",
|
||
settings.thisSystem.c_str(),
|
||
(format("%1%") % settings.maxSilentTime).str().c_str(),
|
||
(format("%1%") % settings.printBuildTrace).str().c_str(),
|
||
(format("%1%") % settings.buildTimeout).str().c_str()
|
||
};
|
||
|
||
worker.hook = std::make_shared<Agent>(settings.guixProgram, args);
|
||
}
|
||
|
||
/* Tell the hook about system features (beyond the system type)
|
||
required from the build machine. (The hook could parse the
|
||
drv file itself, but this is easier.) */
|
||
Strings features = tokenizeString<Strings>(get(drv.env, "requiredSystemFeatures"));
|
||
for (auto& i : features) checkStoreName(i); /* !!! abuse */
|
||
|
||
/* Send the request to the hook. */
|
||
writeLine(worker.hook->toAgent.writeSide, (format("%1% %2% %3% %4%")
|
||
% (worker.getNrLocalBuilds() < settings.maxBuildJobs ? "1" : "0")
|
||
% drv.platform % drvPath % concatStringsSep(",", features)).str());
|
||
|
||
/* Read the first line of input, which should be a word indicating
|
||
whether the hook wishes to perform the build. */
|
||
string reply;
|
||
while (true) {
|
||
string s = readLine(worker.hook->fromAgent.readSide);
|
||
if (string(s, 0, 2) == "# ") {
|
||
reply = string(s, 2);
|
||
break;
|
||
}
|
||
s += "\n";
|
||
writeToStderr(s);
|
||
}
|
||
|
||
debug(format("hook reply is `%1%'") % reply);
|
||
|
||
if (reply == "decline" || reply == "postpone")
|
||
return reply == "decline" ? rpDecline : rpPostpone;
|
||
else if (reply != "accept")
|
||
throw Error(format("bad hook reply `%1%'") % reply);
|
||
|
||
printMsg(lvlTalkative, format("using hook to build path(s) %1%") % showPaths(missingPaths));
|
||
|
||
hook = worker.hook;
|
||
worker.hook.reset();
|
||
|
||
/* Tell the hook all the inputs that have to be copied to the
|
||
remote system. This unfortunately has to contain the entire
|
||
derivation closure to ensure that the validity invariant holds
|
||
on the remote system. (I.e., it's unfortunate that we have to
|
||
list it since the remote system *probably* already has it.) */
|
||
PathSet allInputs;
|
||
allInputs.insert(inputPaths.begin(), inputPaths.end());
|
||
computeFSClosure(worker.store, drvPath, allInputs);
|
||
|
||
string s;
|
||
for (auto& i : allInputs) { s += i; s += ' '; }
|
||
writeLine(hook->toAgent.writeSide, s);
|
||
|
||
/* Tell the hooks the missing outputs that have to be copied back
|
||
from the remote system. */
|
||
s = "";
|
||
for (auto& i : missingPaths) { s += i; s += ' '; }
|
||
writeLine(hook->toAgent.writeSide, s);
|
||
|
||
hook->toAgent.writeSide.close();
|
||
|
||
/* Create the log file and pipe. */
|
||
Path logFile = openLogFile();
|
||
|
||
set<int> fds;
|
||
fds.insert(hook->fromAgent.readSide);
|
||
fds.insert(hook->builderOut.readSide);
|
||
worker.childStarted(shared_from_this(), hook->pid, fds, false, true);
|
||
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ build-started %1% - %2% %3% %4%")
|
||
% drvPath % drv.platform % logFile % hook->pid);
|
||
|
||
return rpAccept;
|
||
}
|
||
|
||
|
||
void chmod_(const Path & path, mode_t mode)
|
||
{
|
||
if (chmod(path.c_str(), mode) == -1)
|
||
throw SysError(format("setting permissions on `%1%'") % path);
|
||
}
|
||
|
||
|
||
/* UID and GID of the build user inside its own user namespace. */
|
||
static const uid_t guestUID = 30001;
|
||
static const gid_t guestGID = 30000;
|
||
|
||
/* Initialize the user namespace of CHILD. */
|
||
static void initializeUserNamespace(pid_t child,
|
||
uid_t hostUID = getuid(),
|
||
gid_t hostGID = getgid(),
|
||
uid_t guestUID = guestUID,
|
||
gid_t guestGID = guestGID)
|
||
{
|
||
writeFile("/proc/" + std::to_string(child) + "/uid_map",
|
||
(format("%d %d 1") % guestUID % hostUID).str());
|
||
|
||
writeFile("/proc/" + std::to_string(child) + "/setgroups", "deny");
|
||
|
||
writeFile("/proc/" + std::to_string(child) + "/gid_map",
|
||
(format("%d %d 1") % guestGID % hostGID).str());
|
||
}
|
||
|
||
#if CHROOT_ENABLED
|
||
|
||
/* Creating TAP device for the fixed-output derivation build environment,
|
||
based on how slirp4netns does it. send_fd_socket is a unix-domain socket
|
||
that a file descriptor for the TAP device will be sent on along with a
|
||
single null byte of regular data. */
|
||
static void setupTap(int send_fd_socket, bool ipv6Enabled)
|
||
{
|
||
AutoCloseFD tapfd;
|
||
struct ifreq ifr;
|
||
struct in6_ifreq ifr6;
|
||
char tapname[] = "tap0";
|
||
int ifindex;
|
||
|
||
tapfd = open("/dev/net/tun", O_RDWR);
|
||
if(tapfd < 0)
|
||
throw SysError("opening `/dev/net/tun'");
|
||
|
||
memset(&ifr, 0, sizeof(ifr));
|
||
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
|
||
strncpy(ifr.ifr_name, tapname, sizeof(ifr.ifr_name) - 1);
|
||
if(ioctl(tapfd, TUNSETIFF, (void*)&ifr) < 0)
|
||
throw SysError("TUNSETIFF");
|
||
|
||
/* DAD is "duplicate address detection". By default the kernel will put
|
||
any ipv6 addresses that we add into the "tentative" state, and only
|
||
after several seconds have been spent trying to chat with network
|
||
neighbors about whether anyone is already using the address will it
|
||
allow it to be bound to, whether for listening or for connecting.
|
||
|
||
This causes tcp connections initiated before then to bind to ::1, which
|
||
obviously is not a valid address for communication between hosts. Even
|
||
after the real addresses leave the "tentative" state, the source address
|
||
used for the already-started connection attempt does not change.
|
||
|
||
In our situation we know for a fact nobody else is using the addresses
|
||
we give, so there's no point in waiting the extra several seconds to
|
||
perform DAD; disable it entirely instead.
|
||
|
||
Note: this needs to use conf/tap0/ instead of conf/all/ */
|
||
writeFile("/proc/sys/net/ipv6/conf/tap0/accept_dad", "0");
|
||
|
||
/* By default tap0 will solicit and receive router advertisements, and
|
||
* thereby obtain an ipv6 address from slirp4netns. But if the host
|
||
* doesn't have a working ipv6 connection, this could mess things up for
|
||
* guest programs (and really the guest network stack itself), as they
|
||
* have no way of knowing that, and will therefore likely try connecting
|
||
* to addresses found in AAAA records, which will fail. To prevent this,
|
||
* ignore router advertisements. */
|
||
writeFile("/proc/sys/net/ipv6/conf/tap0/accept_ra", "0");
|
||
|
||
/* Now set up:
|
||
1. tap0's active flags (so it's running, up, etc)
|
||
2. tap0's MTU
|
||
3. tap0's ip address
|
||
4. tap0's network mask
|
||
5. A default route to tap0 */
|
||
AutoCloseFD sockfd = socket(AF_INET, SOCK_DGRAM, 0);
|
||
|
||
if(sockfd < 0)
|
||
throw SysError("creating socket");
|
||
|
||
AutoCloseFD sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0);
|
||
|
||
if(sockfd6 < 0)
|
||
throw SysError("creating ipv6 socket");
|
||
|
||
if(ioctl(sockfd, SIOCGIFINDEX, &ifr) < 0)
|
||
throw SysError("getting tap0 ifindex");
|
||
|
||
ifindex = ifr.ifr_ifindex;
|
||
|
||
ifr.ifr_flags = IFF_UP | IFF_RUNNING;
|
||
if(ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0)
|
||
throw SysError("setting flags for tap0");
|
||
|
||
/* slirp4netns default */
|
||
ifr.ifr_mtu = 1500;
|
||
if(ioctl(sockfd, SIOCSIFMTU, &ifr) < 0)
|
||
throw SysError("setting MTU for tap0");
|
||
|
||
/* default network CIDR: 10.0.2.0/24, fd00::/64 */
|
||
/* default recommended_vguest: 10.0.2.100, fd00::??? (we choose to use
|
||
fd00::80 and fe80::80) */
|
||
/* default gateway: 10.0.2.2, fd00::2 */
|
||
struct sockaddr_in *sai = (struct sockaddr_in *) &ifr.ifr_addr;
|
||
sai->sin_family = AF_INET;
|
||
sai->sin_port = htonl(0);
|
||
if(inet_pton(AF_INET, "10.0.2.100", &sai->sin_addr) != 1)
|
||
throw Error("inet_pton failed");
|
||
|
||
if(ioctl(sockfd, SIOCSIFADDR, &ifr) < 0)
|
||
throw SysError("setting tap0 address");
|
||
|
||
if(ipv6Enabled) {
|
||
if(inet_pton(AF_INET6, "fd00::80", &ifr6.ifr6_addr) != 1)
|
||
throw Error("inet_pton failed");
|
||
ifr6.ifr6_prefixlen = 64;
|
||
ifr6.ifr6_ifindex = ifindex;
|
||
|
||
if(ioctl(sockfd6, SIOCSIFADDR, &ifr6) < 0)
|
||
throw SysError("setting tap0 ipv6 address");
|
||
}
|
||
|
||
/* Always set up the link-local address so that communication with the
|
||
* host loopback over ipv6 can be possible. */
|
||
if(inet_pton(AF_INET6, "fe80::80", &ifr6.ifr6_addr) != 1)
|
||
throw Error("inet_pton failed");
|
||
ifr6.ifr6_prefixlen = 64;
|
||
ifr6.ifr6_ifindex = ifindex;
|
||
|
||
if(ioctl(sockfd6, SIOCSIFADDR, &ifr6) < 0)
|
||
throw SysError("setting tap0 link-local ipv6 address");
|
||
|
||
if(inet_pton(AF_INET, "255.255.255.0", &sai->sin_addr) != 1)
|
||
throw Error("inet_pton failed");
|
||
|
||
if(ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0)
|
||
throw SysError("setting tap0 network mask");
|
||
|
||
/* To my knowledge there is no official documentation of SIOCADDRT and
|
||
struct rtentry for Linux aside from the Linux kernel source code as of
|
||
the year 2025. This is therefore fully cargo-culted from
|
||
slirp4netns. */
|
||
|
||
struct rtentry route;
|
||
memset(&route, 0, sizeof(route));
|
||
sai = (struct sockaddr_in *)&route.rt_gateway;
|
||
sai->sin_family = AF_INET;
|
||
if(inet_pton(AF_INET, "10.0.2.2", &sai->sin_addr) != 1)
|
||
throw Error("inet_pton failed");
|
||
sai = (struct sockaddr_in *)&route.rt_dst;
|
||
sai->sin_family = AF_INET;
|
||
sai->sin_addr.s_addr = htonl(INADDR_ANY);
|
||
sai = (struct sockaddr_in *)&route.rt_genmask;
|
||
sai->sin_family = AF_INET;
|
||
sai->sin_addr.s_addr = htonl(INADDR_ANY);
|
||
|
||
route.rt_flags = RTF_UP | RTF_GATEWAY;
|
||
route.rt_metric = 0;
|
||
route.rt_dev = tapname;
|
||
|
||
if(ioctl(sockfd, SIOCADDRT, &route) < 0)
|
||
throw SysError("setting tap0 as default route");
|
||
|
||
struct in6_rtmsg route6;
|
||
memset(&route6, 0, sizeof(route6));
|
||
if(inet_pton(AF_INET6, "fd00::2", &route6.rtmsg_gateway) != 1)
|
||
throw Error("inet_pton failed");
|
||
|
||
if(ipv6Enabled) {
|
||
/* Set up a default gateway via slirp4netns */
|
||
route6.rtmsg_dst = IN6ADDR_ANY_INIT;
|
||
route6.rtmsg_dst_len = 0;
|
||
route6.rtmsg_flags = RTF_UP | RTF_GATEWAY;
|
||
} else {
|
||
/* Set up a route to slirp4netns, but only for talking to the host
|
||
* loopback */
|
||
if(inet_pton(AF_INET6, "fd00::2", &route6.rtmsg_dst) != 1)
|
||
throw Error("inet_pton failed");
|
||
route6.rtmsg_dst_len = 128;
|
||
route6.rtmsg_flags = RTF_UP;
|
||
}
|
||
route6.rtmsg_src = IN6ADDR_ANY_INIT;
|
||
route6.rtmsg_src_len = 0;
|
||
route6.rtmsg_ifindex = ifindex;
|
||
route6.rtmsg_metric = 1;
|
||
|
||
if(ioctl(sockfd6, SIOCADDRT, &route6) < 0)
|
||
throw SysError("setting tap0 as default ipv6 route");
|
||
|
||
sendFD(send_fd_socket, tapfd);
|
||
}
|
||
|
||
|
||
struct ChrootBuildSpawnContext : CloneSpawnContext {
|
||
bool ipv6Enabled = false;
|
||
};
|
||
|
||
static void setupTapAction(SpawnContext & sctx)
|
||
{
|
||
ChrootBuildSpawnContext & ctx = (ChrootBuildSpawnContext &) sctx;
|
||
setupTap(ctx.setupFD, ctx.ipv6Enabled);
|
||
}
|
||
|
||
|
||
static void waitForSlirpReadyAction(SpawnContext & sctx)
|
||
{
|
||
CloneSpawnContext & ctx = (CloneSpawnContext &) sctx;
|
||
/* Wait for the parent process to get slirp4netns running */
|
||
waitForMessage(ctx.setupFD, "1");
|
||
}
|
||
|
||
|
||
static void enableRouteLocalnetAction(SpawnContext & sctx)
|
||
{
|
||
/* Don't treat as invalid packets received with loopback source addresses.
|
||
This allows for packets to be received from the host loopback using its
|
||
real address, so for example proxy settings referencing 127.0.0.1 will
|
||
work both for builtin and regular fixed-output derivations. */
|
||
|
||
/* Note: this file is treated relative to the network namespace of the
|
||
process that opens it. We aren't modifying any host settings here,
|
||
provided we are in a new network namespace. */
|
||
Path route_localnet4 = "/proc/sys/net/ipv4/conf/all/route_localnet";
|
||
/* XXX: no such toggle exists for ipv6 */
|
||
if(pathExists(route_localnet4))
|
||
writeFile(route_localnet4, "1");
|
||
}
|
||
|
||
|
||
static void prepareSlirpChrootAction(SpawnContext & sctx)
|
||
{
|
||
CloneSpawnContext & ctx = (CloneSpawnContext &) sctx;
|
||
auto mounts = tokenizeString<Strings>(readFile("/proc/self/mountinfo", true), "\n");
|
||
set<string> seen;
|
||
for(auto & i : mounts) {
|
||
auto fields = tokenizeString<vector<string> >(i, " ");
|
||
auto fs = decodeOctalEscaped(fields.at(4));
|
||
if(seen.find(fs) == seen.end()) {
|
||
/* slirp4netns only does a single umount of the old root ("/old")
|
||
after pivot_root. Because of this, if there are multiple
|
||
mounts stacked on top of each other, only the topmost one (the
|
||
read-only bind mount) will be unmounted, leaving the real root
|
||
in place and causing the subsequent rmdir to fail. The best we
|
||
can do is to make everything immediately underneath "/" be
|
||
read-only, which we do after mounting every non-/ filesystem
|
||
read-only. */
|
||
if(fs == "/") continue;
|
||
/* Don't mount /etc or any of its subdirectories, we're only interested
|
||
in mounting network stuff from it */
|
||
if(fs.compare(0, 4, "/etc") == 0) continue;
|
||
/* We want /run to be empty */
|
||
if(fs.compare(0, 4, "/run") == 0) continue;
|
||
/* Don't mount anything from under our chroot directory */
|
||
if(fs.compare(0, ctx.chrootRootDir.length(), ctx.chrootRootDir) == 0) continue;
|
||
struct stat st;
|
||
if(stat(fs.c_str(), &st) != 0) {
|
||
if(errno == EACCES) continue; /* Not accessible anyway */
|
||
else throw SysError(format("stat of `%1%'") % fs);
|
||
}
|
||
|
||
ctx.readOnlyFilesInChroot.insert(fs);
|
||
ctx.filesInChroot[fs] = fs;
|
||
seen.insert(fs);
|
||
}
|
||
}
|
||
|
||
/* Limit /etc to containing just /etc/resolv.conf and /etc/hosts, and
|
||
read-only at that */
|
||
Strings etcFiles = { "/etc/resolv.conf", "/etc/hosts" };
|
||
for(auto & i : etcFiles) {
|
||
if(pathExists(i)) {
|
||
ctx.filesInChroot[i] = i;
|
||
ctx.readOnlyFilesInChroot.insert(i);
|
||
}
|
||
}
|
||
|
||
/* Make everything immediately under "/" read-only, since we can't make /
|
||
itself read-only. */
|
||
DirEntries dirs = readDirectory("/");
|
||
for (auto & i : dirs) {
|
||
string fs = "/" + i.name;
|
||
if(fs == "/etc") continue;
|
||
if(fs == "/run") continue;
|
||
ctx.filesInChroot[fs] = fs;
|
||
ctx.readOnlyFilesInChroot.insert(fs);
|
||
}
|
||
|
||
if(mkdir((ctx.chrootRootDir + "/run").c_str(), 0700) == -1)
|
||
throw SysError("mkdir /run in chroot");
|
||
}
|
||
|
||
|
||
static void remapIdsTo0Action(SpawnContext & sctx)
|
||
{
|
||
CloneSpawnContext & ctx = (CloneSpawnContext &) sctx;
|
||
string uid = std::to_string(ctx.setuid ? ctx.user : getuid());
|
||
string gid = std::to_string(ctx.setgid ? ctx.group : getgid());
|
||
|
||
/* If uid != getuid(), then the process that writes to uid_map needs
|
||
* capabilities in the parent user namespace. Fork a child to stay in
|
||
* the parent namespace and do the write for us. */
|
||
unshareAndInitUserns(CLONE_NEWUSER,
|
||
"0 " + uid + " 1",
|
||
"0 " + gid + " 1",
|
||
ctx.lockMountsAllowSetgroups);
|
||
|
||
ctx.user = 0;
|
||
ctx.group = 0;
|
||
}
|
||
|
||
|
||
static std::vector<struct sock_filter> slirpSeccompFilter()
|
||
{
|
||
std::vector<struct sock_filter> out;
|
||
struct sock_filter allow = BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW);
|
||
struct sock_filter deny = BPF_STMT(BPF_RET | BPF_K,
|
||
/* Could also use
|
||
* SECCOMP_RET_KILL_THREAD, but this
|
||
* gives nicer error messages. */
|
||
SECCOMP_RET_ERRNO | ENOSYS);
|
||
struct sock_filter silentDeny = BPF_STMT(BPF_RET | BPF_K,
|
||
SECCOMP_RET_ERRNO | 0);
|
||
|
||
/* instructions to check for AF_INET or AF_INET6 in the first argument */
|
||
std::vector<struct sock_filter> allowInet;
|
||
seccompMatchu64(allowInet,
|
||
AF_INET,
|
||
{allow},
|
||
offsetof(struct seccomp_data, args[0]));
|
||
seccompMatchu64(allowInet,
|
||
AF_INET6,
|
||
{allow},
|
||
offsetof(struct seccomp_data, args[0]));
|
||
/* ... and deny otherwise */
|
||
std::vector<struct sock_filter> denyNonInet;
|
||
denyNonInet.insert(denyNonInet.begin(), allowInet.begin(), allowInet.end());
|
||
denyNonInet.push_back(deny);
|
||
|
||
/* ... and silent variant. */
|
||
std::vector<struct sock_filter> silentDenyNonInet;
|
||
|
||
silentDenyNonInet.insert(silentDenyNonInet.begin(), allowInet.begin(), allowInet.end());
|
||
silentDenyNonInet.push_back(silentDeny);
|
||
|
||
/* accumulator <-- data.arch */
|
||
out.push_back(BPF_STMT(BPF_LD | BPF_W | BPF_ABS, (offsetof(struct seccomp_data, arch))));
|
||
/* Deny if non-native arch. This simplifies checks as we can now just use
|
||
* the __NR_* syscall numbers. */
|
||
out.push_back(BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K,
|
||
AUDIT_ARCH_NATIVE,
|
||
1,
|
||
0));
|
||
out.push_back(deny);
|
||
|
||
std::vector<Uint32RangeAction> specialCaseActions;
|
||
|
||
#ifdef __NR_socket
|
||
Uint32RangeAction socketAction;
|
||
socketAction.low = __NR_socket;
|
||
socketAction.high = __NR_socket;
|
||
socketAction.instructions = denyNonInet;
|
||
specialCaseActions.push_back(socketAction);
|
||
#endif
|
||
|
||
#ifdef __NR_socketpair
|
||
/* socketpair can be used to create unix sockets. Presumably they can't
|
||
* be re-bound or reconnected to use the abstract unix socket namespace,
|
||
* since they're already connected, but let's not risk it - slirp4netns
|
||
* shouldn't have a reason to use any IPC anyway. */
|
||
Uint32RangeAction socketpairAction;
|
||
socketpairAction.low = __NR_socketpair;
|
||
socketpairAction.high = __NR_socketpair;
|
||
/* The silent variant is necessary for socketpair because slirp4netns
|
||
unconditionally creates a unix socket using socketpair for using setns
|
||
to exfiltrate a tapfd, despite not actually needing to do that at all
|
||
since we pass it the tapfd directly. It will refuse to start if
|
||
socketpair returns anything but 0, so we have no choice but to do that.
|
||
The would-be-returned socket fds are never used. */
|
||
socketpairAction.instructions = silentDenyNonInet;
|
||
specialCaseActions.push_back(socketpairAction);
|
||
#endif
|
||
|
||
#ifdef __NR_socketcall
|
||
/* Some architectures include a system call "socketcall" for multiplexing
|
||
* all the socket-related calls. This system call only accepts two
|
||
* arguments: a number to indicate which socket-related system call to
|
||
* invoke, and a pointer to an array holding the arguments for it.
|
||
* Seccomp can't inspect the contents of memory, only the raw bits passed
|
||
* to the kernel, so there's no way to only disallow certain invocations
|
||
* of a socket-related system call. In the past decade, most linux
|
||
* architectures which relied on "socketcall" have since added dedicated
|
||
* system calls (socket, socketpair, connect, etc) that can be used
|
||
* instead of socketcall, and it was mostly uncommon architectures that
|
||
* relied on it in the first place, so we should be fine to just block it
|
||
* outright. */
|
||
Uint32RangeAction socketcallAction;
|
||
socketcallAction.low = __NR_socketcall;
|
||
socketcallAction.high = __NR_socketcall;
|
||
socketcallAction.instructions = {deny};
|
||
specialCaseActions.push_back(socketcallAction);
|
||
#endif
|
||
|
||
/* Kernels before 4.8 allow a process to bypass seccomp restrictions by
|
||
* spawning another process to ptrace it and modify a system call after
|
||
* the seccomp check. */
|
||
Uint32RangeAction ptraceAction;
|
||
ptraceAction.low = __NR_ptrace;
|
||
ptraceAction.high = __NR_ptrace;
|
||
ptraceAction.instructions = { deny };
|
||
specialCaseActions.push_back(ptraceAction);
|
||
|
||
std::vector<struct sock_filter> specialCases =
|
||
rangeActionsToFilter(specialCaseActions);
|
||
|
||
/* accumulator <-- data.nr */
|
||
out.push_back(BPF_STMT(BPF_LD | BPF_W | BPF_ABS, (offsetof(struct seccomp_data, nr))));
|
||
|
||
out.insert(out.end(), specialCases.begin(), specialCases.end());
|
||
|
||
/* accumulator <-- data.nr again */
|
||
out.push_back(BPF_STMT(BPF_LD | BPF_W | BPF_ABS, (offsetof(struct seccomp_data, nr))));
|
||
|
||
std::vector<Uint32RangeAction> pinnedSyscallRanges = NATIVE_SYSCALL_RANGES;
|
||
if(pinnedSyscallRanges.size() != 0) {
|
||
for(auto & i : pinnedSyscallRanges) {
|
||
i.instructions.push_back(allow);
|
||
}
|
||
std::vector<struct sock_filter> pinnedWhitelist = rangeActionsToFilter(pinnedSyscallRanges);
|
||
out.insert(out.end(), pinnedWhitelist.begin(), pinnedWhitelist.end());
|
||
out.push_back(deny);
|
||
}
|
||
else {
|
||
/* Couldn't determine pinned system calls, resort to allowing by
|
||
* default. */
|
||
out.push_back(allow);
|
||
}
|
||
return out;
|
||
}
|
||
|
||
|
||
#if DEBUG_SECCOMP_FILTER
|
||
|
||
/* Note: limited to only the subset we actually use, makes various
|
||
* assumptions, not general-purpose. */
|
||
static void writeSeccompFilterDot(std::vector<struct sock_filter> filter, FILE *f)
|
||
{
|
||
fprintf(f, "digraph filter { \n");
|
||
for(size_t j = 0; j < filter.size(); j++) {
|
||
switch(BPF_CLASS(filter[j].code)) {
|
||
case BPF_LD:
|
||
fprintf(f, "\"%zu\" [label=\"load into accumulator from offset %u\"];\n",
|
||
j, filter[j].k);
|
||
fprintf(f, "\"%zu\" -> \"%zu\";\n", j, j + 1);
|
||
break;
|
||
case BPF_JMP:
|
||
switch(BPF_OP(filter[j].code)) {
|
||
case BPF_JA:
|
||
fprintf(f, "\"%zu\" [label=\"unconditional jump\"];\n", j);
|
||
fprintf(f, "\"%zu\" -> \"%zu\";\n", j, j + filter[j].k + 1);
|
||
break;
|
||
case BPF_JEQ:
|
||
fprintf(f, "\"%zu\" [label=\"jump if accumulator = %u\"];\n", j,
|
||
filter[j].k);
|
||
fprintf(f, "\"%zu\" -> \"%zu\" [label=\"true\"];\n", j,
|
||
j + filter[j].jt + 1);
|
||
fprintf(f, "\"%zu\" -> \"%zu\" [label=\"false\"];\n", j,
|
||
j + filter[j].jf + 1);
|
||
break;
|
||
case BPF_JGT:
|
||
fprintf(f, "\"%zu\" [label=\"jump if accumulator > %u\"];\n", j,
|
||
filter[j].k);
|
||
fprintf(f, "\"%zu\" -> \"%zu\" [label=\"true\"];\n", j,
|
||
j + filter[j].jt + 1);
|
||
fprintf(f, "\"%zu\" -> \"%zu\" [label=\"false\"];\n", j,
|
||
j + filter[j].jf + 1);
|
||
break;
|
||
case BPF_JGE:
|
||
fprintf(f, "\"%zu\" [label=\"jump if accumulator >= %u\"];\n", j,
|
||
filter[j].k);
|
||
fprintf(f, "\"%zu\" -> \"%zu\" [label=\"true\"];\n", j,
|
||
j + filter[j].jt + 1);
|
||
fprintf(f, "\"%zu\" -> \"%zu\" [label=\"false\"];\n", j,
|
||
j + filter[j].jf + 1);
|
||
break;
|
||
default:
|
||
fprintf(stderr, "unrecognized jump operation at %zu: %d\n", j, BPF_OP(filter[j].code));
|
||
}
|
||
break;
|
||
case BPF_RET:
|
||
switch(filter[j].k & SECCOMP_RET_ACTION_FULL) {
|
||
case SECCOMP_RET_KILL_PROCESS:
|
||
fprintf(f, "\"%zu\" [label=\"kill the process\"];\n", j);
|
||
break;
|
||
case SECCOMP_RET_KILL_THREAD:
|
||
fprintf(f, "\"%zu\" [label=\"kill the thread\"];\n", j);
|
||
break;
|
||
case SECCOMP_RET_ERRNO:
|
||
fprintf(f, "\"%zu\" [label=\"return errno for \\\"%s\\\"\"];\n",
|
||
j, strerror(filter[j].k & SECCOMP_RET_DATA));
|
||
break;
|
||
case SECCOMP_RET_ALLOW:
|
||
fprintf(f, "\"%zu\" [label=\"allow system call\"];\n", j);
|
||
break;
|
||
default:
|
||
fprintf(stderr, "unrecognized return operation at %zu: %d\n", j, filter[j].k);
|
||
break;
|
||
}
|
||
break;
|
||
default:
|
||
fprintf(stderr, "unrecognized bpf class at %zu: %d\n", j, BPF_CLASS(filter[j].code));
|
||
}
|
||
}
|
||
fprintf(f, "}\n");
|
||
}
|
||
|
||
#endif
|
||
|
||
/* Spawn 'slirp4netns' in separate namespaces as the given user and group;
|
||
'tapfd' must correspond to a /dev/net/tun connection. Configure it to
|
||
write to 'notifyReadyFD' once it's up and running. */
|
||
static pid_t spawnSlirp4netns(int tapfd, int notifyReadyFD,
|
||
uid_t slirpUser, gid_t slirpGroup)
|
||
{
|
||
Pipe slirpSetupPipe;
|
||
CloneSpawnContext slirpCtx;
|
||
AutoCloseFD devNullFd;
|
||
bool amRoot = geteuid() == 0;
|
||
bool newUserNS = !amRoot;
|
||
slirpCtx.phases = getCloneSpawnPhases();
|
||
slirpCtx.cloneFlags =
|
||
/* slirp4netns will handle the chroot and pivot_root on its own, but
|
||
we should ensure that whatever filesystem holds the slirp4netns
|
||
executable is read-only, since otherwise it might be possible for a
|
||
compromised slirp4netns to overwrite itself using /proc/self/exe,
|
||
depending on who owns what. */
|
||
CLONE_NEWNS |
|
||
/* ptrace disregards user namespaces when the would-be tracing process
|
||
and the would-be traced process have the same real, effective, and
|
||
saved user ids. The only way to protect them is to make it
|
||
impossible to reference them. */
|
||
CLONE_NEWPID |
|
||
/* need this when we're not running as root so that we have the
|
||
* capabilities to create the other namespaces. */
|
||
(newUserNS ? CLONE_NEWUSER : 0) |
|
||
/* For good measure */
|
||
CLONE_NEWIPC |
|
||
CLONE_NEWUTS |
|
||
/* Of course, a new network namespace would defeat the
|
||
purpose. */
|
||
SIGCHLD;
|
||
slirpCtx.program = settings.slirp4netns;
|
||
slirpCtx.args =
|
||
{ "slirp4netns", "--netns-type=tapfd",
|
||
"--enable-sandbox",
|
||
"--enable-ipv6",
|
||
"--ready-fd=" + std::to_string(notifyReadyFD) };
|
||
if(!settings.useHostLoopback)
|
||
slirpCtx.args.push_back("--disable-host-loopback");
|
||
slirpCtx.args.push_back(std::to_string(tapfd));
|
||
slirpCtx.inheritEnv = true;
|
||
if(newUserNS) {
|
||
slirpSetupPipe.create();
|
||
slirpCtx.setupFD = slirpSetupPipe.readSide;
|
||
slirpCtx.earlyCloseFDs.insert(slirpSetupPipe.writeSide);
|
||
}
|
||
slirpCtx.closeMostFDs = true;
|
||
slirpCtx.preserveFDs.insert(notifyReadyFD);
|
||
slirpCtx.preserveFDs.insert(tapfd);
|
||
slirpCtx.setStdin = true;
|
||
slirpCtx.stdinFile = "/dev/null";
|
||
slirpCtx.setsid = true;
|
||
slirpCtx.dropAmbientCapabilities = true;
|
||
slirpCtx.doChroot = true;
|
||
slirpCtx.mountTmpfsOnChroot = true;
|
||
slirpCtx.chrootRootDir = getEnv("TMPDIR", "/tmp");
|
||
slirpCtx.lockMounts = true;
|
||
slirpCtx.lockMountsMapAll = true; /* So that later setuid will work */
|
||
slirpCtx.lockMountsAllowSetgroups = amRoot;
|
||
slirpCtx.mountProc = true;
|
||
slirpCtx.setuid = true;
|
||
slirpCtx.user = slirpUser;
|
||
slirpCtx.setgid = true;
|
||
slirpCtx.group = slirpGroup;
|
||
/* Dropping supplementary groups requires capabilities in current user
|
||
* namespace */
|
||
if(amRoot) {
|
||
slirpCtx.supplementaryGroups = {};
|
||
slirpCtx.setSupplementaryGroups = true;
|
||
}
|
||
/* Unless built with '--enable-kernel=4.3.0' or similar, glibc on i686
|
||
uses 'socketcall' instead of dedicated system calls like 'socket' and
|
||
'bind'. Since the seccomp filter cannot inspect 'socketcall' arguments
|
||
in a meaningful way, it can only prohibit all 'socketcall' calls; the
|
||
other option is to disable the seccomp filter entirely, meaning that
|
||
slirp4netns would have access to abstract unix sockets in the root
|
||
network namespace. */
|
||
#ifdef __NR_socketcall
|
||
#ifndef NO_SOCKETCALL_LIBC
|
||
if(getenv("GUIX_FORCE_SECCOMP") == NULL)
|
||
printMsg(lvlInfo, "warning: seccomp filter for slirp4netns presumed unusable with this libc, disabling it");
|
||
else
|
||
#endif
|
||
#endif
|
||
{
|
||
slirpCtx.seccompFilter = slirpSeccompFilter();
|
||
slirpCtx.addSeccompFilter = true;
|
||
}
|
||
|
||
/* Silence slirp4netns output unless requested */
|
||
if(verbosity <= lvlInfo) {
|
||
devNullFd = open("/dev/null", O_WRONLY);
|
||
if(devNullFd == -1)
|
||
throw SysError("cannot open `/dev/null'");
|
||
slirpCtx.logFD = devNullFd;
|
||
}
|
||
|
||
#if DEBUG_SECCOMP_FILTER
|
||
writeSeccompFilterDot(slirpCtx.seccompFilter, stderr);
|
||
fflush(stderr);
|
||
#endif
|
||
|
||
addPhaseAfter(slirpCtx.phases,
|
||
"makeChrootSeparateFilesystem",
|
||
"prepareSlirpChroot",
|
||
prepareSlirpChrootAction);
|
||
|
||
/* slirp behaves differently when uid != 0 */
|
||
addPhaseAfter(slirpCtx.phases,
|
||
"lockMounts",
|
||
"remapIdsTo0",
|
||
remapIdsTo0Action);
|
||
|
||
#if 0 /* For debugging networking issues */
|
||
slirpCtx.env["SLIRP_DEBUG"] = "call,misc,error,tftp,verbose_call";
|
||
slirpCtx.env["G_MESSAGES_DEBUG"] = "all";
|
||
#endif
|
||
|
||
pid_t slirpPid = cloneChild(slirpCtx);
|
||
|
||
if(newUserNS) {
|
||
slirpSetupPipe.readSide.close();
|
||
initializeUserNamespace(slirpPid, getuid(), getgid(), getuid(), getgid());
|
||
writeFull(slirpSetupPipe.writeSide, (unsigned char*)"go\n", 3);
|
||
}
|
||
return slirpPid;
|
||
}
|
||
|
||
static void clearRootWritePermsAction(SpawnContext & sctx)
|
||
{
|
||
if(chmod("/", 0555) == -1)
|
||
throw SysError("changing mode of chroot root directory");
|
||
}
|
||
|
||
|
||
/* Note: linux-only */
|
||
bool haveGlobalIPv6Address()
|
||
{
|
||
if(!pathExists("/proc/net/if_inet6")) return false;
|
||
|
||
auto addresses = tokenizeString<Strings>(readFile("/proc/net/if_inet6", true), "\n");
|
||
for(auto & i : addresses) {
|
||
auto fields = tokenizeString<vector<string> >(i, " ");
|
||
auto scopeHex = fields.at(3);
|
||
/* 0x0 means "Global scope" */
|
||
if(scopeHex == "00" || scopeHex == "40") return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
#endif /* CHROOT_ENABLED */
|
||
|
||
/* Return true if the operating system kernel part of SYSTEM1 and SYSTEM2 (the
|
||
bit that comes after the hyphen in system types such as "i686-linux") is
|
||
the same. */
|
||
static bool sameOperatingSystemKernel(const std::string& system1, const std::string& system2)
|
||
{
|
||
auto os1 = system1.substr(system1.find("-"));
|
||
auto os2 = system2.substr(system2.find("-"));
|
||
return os1 == os2;
|
||
}
|
||
|
||
|
||
void DerivationGoal::execBuilderOrBuiltin(SpawnContext & ctx)
|
||
{
|
||
if(isBuiltin(drv)) {
|
||
/* Note: must not return from this block */
|
||
try {
|
||
logType = ltFlat;
|
||
|
||
auto buildDrv = lookupBuiltinBuilder(drv.builder);
|
||
if (buildDrv != NULL) {
|
||
/* Check what the output file name is. When doing a 'bmCheck'
|
||
build, the output file name is different from that
|
||
specified in DRV due to hash rewriting. */
|
||
Path output = drv.outputs["out"].path;
|
||
auto redirected = redirectedOutputs.find(output);
|
||
if (redirected != redirectedOutputs.end())
|
||
output = redirected->second;
|
||
|
||
buildDrv(drv, drvPath, output);
|
||
}
|
||
else
|
||
throw Error(format("unsupported builtin function '%1%'") % string(drv.builder, 8));
|
||
_exit(0);
|
||
} catch (std::exception & e) {
|
||
writeFull(STDERR_FILENO, "error: " + string(e.what()) + "\n");
|
||
_exit(1);
|
||
}
|
||
}
|
||
/* Ensure that the builder is within the store. This prevents users from
|
||
using /proc/self/exe (or a symlink to it) as their builder, which could
|
||
allow them to overwrite the guix-daemon binary (CVE-2019-5736).
|
||
|
||
This attack is possible even if the target of /proc/self/exe is outside
|
||
the chroot (it's as if it were a hard link), though it requires that
|
||
its ELF interpreter and dependencies be in the chroot.
|
||
|
||
Note: 'canonPath' throws if 'ctx.program' cannot be resolved within the
|
||
chroot. */
|
||
ctx.program = canonPath(ctx.program, true);
|
||
if(!isInStore(ctx.program))
|
||
throw Error(format("derivation builder `%1' is outside the store") % ctx.program);
|
||
/* If DRV targets the same operating system kernel, try to execute it:
|
||
there might be binfmt_misc set up for user-land emulation of other
|
||
architectures. However, if it targets a different operating
|
||
system--e.g., "i586-gnu" vs. "x86_64-linux"--do not try executing it:
|
||
the ELF file for that OS is likely indistinguishable from a native ELF
|
||
binary and it would just crash at run time. */
|
||
int error;
|
||
if (sameOperatingSystemKernel(drv.platform, settings.thisSystem)) {
|
||
try {
|
||
execAction(ctx);
|
||
error = errno;
|
||
} catch(SysError & e) {
|
||
error = e.errNo;
|
||
}
|
||
} else {
|
||
error = ENOEXEC;
|
||
}
|
||
/* Right platform? Check this after we've tried 'execve' to allow for
|
||
transparent emulation of different platforms with binfmt_misc handlers
|
||
that invoke QEMU. */
|
||
if (error == ENOEXEC && !canBuildLocally(drv.platform)) {
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ unsupported-platform %1% %2%") % drvPath % drv.platform);
|
||
throw Error(format("a `%1%' is required to build `%3%', but I am a `%2%'")
|
||
% drv.platform % settings.thisSystem % drvPath);
|
||
}
|
||
|
||
errno = error;
|
||
throw SysError(format("executing `%1%'") % drv.builder);
|
||
}
|
||
|
||
|
||
void execBuilderOrBuiltinAction(SpawnContext & ctx)
|
||
{
|
||
((DerivationGoal *)ctx.extraData)->execBuilderOrBuiltin(ctx);
|
||
}
|
||
|
||
|
||
void DerivationGoal::startBuilder()
|
||
{
|
||
auto f = format(
|
||
buildMode == bmRepair ? "repairing path(s) %1%" :
|
||
buildMode == bmCheck ? "checking path(s) %1%" :
|
||
nrRounds > 1 ? "building path(s) %1% (round %2%/%3%)" :
|
||
"building path(s) %1%");
|
||
f.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
|
||
startNest(nest, lvlInfo, f % showPaths(missingPaths) % curRound % nrRounds);
|
||
|
||
/* A ChrootBuildSpawnContext reference can be passed to procedures
|
||
expecting a SpawnContext reference */
|
||
#if CHROOT_ENABLED
|
||
ChrootBuildSpawnContext ctx;
|
||
#else
|
||
SpawnContext ctx;
|
||
#endif
|
||
|
||
ctx.extraData = (void *) this;
|
||
ctx.setsid = true;
|
||
ctx.oomSacrifice = true;
|
||
ctx.signalSetupSuccess = true;
|
||
ctx.setStdin = true;
|
||
ctx.stdinFile = "/dev/null";
|
||
ctx.closeMostFDs = true;
|
||
ctx.program = drv.builder;
|
||
ctx.args = drv.args;
|
||
if(!isBuiltin(drv))
|
||
ctx.args.insert(ctx.args.begin(), baseNameOf(drv.builder));
|
||
|
||
#if __linux__
|
||
ctx.dropAmbientCapabilities = true;
|
||
ctx.persona = PER_LINUX; /* default */
|
||
ctx.setPersona = true;
|
||
/* Change the personality to 32-bit if we're doing an
|
||
i686-linux build on an x86_64-linux machine. */
|
||
struct utsname utsbuf;
|
||
uname(&utsbuf);
|
||
if (drv.platform == "i686-linux" &&
|
||
(settings.thisSystem == "x86_64-linux" ||
|
||
(!strcmp(utsbuf.sysname, "Linux") && !strcmp(utsbuf.machine, "x86_64")))) {
|
||
ctx.persona = PER_LINUX32;
|
||
}
|
||
|
||
if (drv.platform == "armhf-linux" &&
|
||
(settings.thisSystem == "aarch64-linux" ||
|
||
(!strcmp(utsbuf.sysname, "Linux") && !strcmp(utsbuf.machine, "aarch64")))) {
|
||
ctx.persona = PER_LINUX32;
|
||
}
|
||
|
||
/* Impersonate a Linux 2.6 machine to get some determinism in
|
||
builds that depend on the kernel version. */
|
||
if ((drv.platform == "i686-linux" || drv.platform == "x86_64-linux") && settings.impersonateLinux26) {
|
||
ctx.persona |= 0x0020000; /* == UNAME26 */
|
||
}
|
||
|
||
/* Disable address space randomization for improved determinism. */
|
||
ctx.persona |= ADDR_NO_RANDOMIZE;
|
||
|
||
#endif
|
||
|
||
/* Note: built-in builders are *not* running in a chroot environment so
|
||
that we can easily implement them in Guile without having it as a
|
||
derivation input (they are running under a separate build user,
|
||
though). */
|
||
useChroot = settings.useChroot && !isBuiltin(drv);
|
||
|
||
/* Construct the environment passed to the builder. */
|
||
ctx.env.clear();
|
||
ctx.inheritEnv = false;
|
||
|
||
/* Most shells initialise PATH to some default (/bin:/usr/bin:...) when
|
||
PATH is not set. We don't want this, so we fill it in with some dummy
|
||
value. */
|
||
ctx.env["PATH"] = "/path-not-set";
|
||
|
||
/* Set HOME to a non-existing path to prevent certain programs from using
|
||
/etc/passwd (or NIS, or whatever) to locate the home directory (for
|
||
example, wget looks for ~/.wgetrc). I.e., these tools use /etc/passwd
|
||
if HOME is not set, but they will just assume that the settings file
|
||
they are looking for does not exist if HOME is set but points to some
|
||
non-existing path. */
|
||
Path homeDir = "/homeless-shelter";
|
||
ctx.env["HOME"] = homeDir;
|
||
|
||
/* Tell the builder where the store is. Usually they
|
||
shouldn't care, but this is useful for purity checking (e.g.,
|
||
the compiler or linker might only want to accept paths to files
|
||
in the store or in the build directory). */
|
||
ctx.env["NIX_STORE"] = settings.nixStore;
|
||
|
||
/* The maximum number of cores to utilize for parallel building. */
|
||
ctx.env["NIX_BUILD_CORES"] = (format("%d") % settings.buildCores).str();
|
||
|
||
/* Add all bindings specified in the derivation. */
|
||
for (auto& i : drv.env)
|
||
ctx.env[i.first] = i.second;
|
||
|
||
/* Create a temporary directory where the build will take
|
||
place. */
|
||
auto drvName = storePathToName(drvPath);
|
||
tmpDir = createTempDir("", "guix-build-" + drvName, false, false, 0700);
|
||
|
||
if (useChroot) {
|
||
/* Make the build directory seen by the build process a sub-directory.
|
||
That way, "/tmp/guix-build-foo.drv-0" is root-owned, and thus its
|
||
permissions cannot be changed by the build process, while
|
||
"/tmp/guix-build-foo.drv-0/top" is owned by the build user. This
|
||
cannot be done when !useChroot because then $NIX_BUILD_TOP would
|
||
be inaccessible to the build user by its full file name.
|
||
|
||
If the build user could make the build directory world-writable,
|
||
then an attacker could create in it a hardlink to a root-owned file
|
||
such as /etc/shadow. If 'keepFailed' is true, the daemon would
|
||
then chown that hardlink to the user, giving them write access to
|
||
that file. See CVE-2021-27851. */
|
||
tmpDir += "/top";
|
||
if (mkdir(tmpDir.c_str(), 0700) == 1)
|
||
throw SysError("creating top-level build directory");
|
||
}
|
||
|
||
/* In a sandbox, for determinism, always use the same temporary
|
||
directory. */
|
||
tmpDirInSandbox = useChroot ? canonPath("/tmp", true) + "/guix-build-" + drvName + "-0" : tmpDir;
|
||
|
||
ctx.setcwd = true;
|
||
ctx.cwd = tmpDirInSandbox;
|
||
/* For convenience, set an environment pointing to the top build
|
||
directory. */
|
||
ctx.env["NIX_BUILD_TOP"] = tmpDirInSandbox;
|
||
|
||
/* Also set TMPDIR and variants to point to this directory. */
|
||
ctx.env["TMPDIR"] = ctx.env["TEMPDIR"] = ctx.env["TMP"] = ctx.env["TEMP"] = tmpDirInSandbox;
|
||
|
||
/* Explicitly set PWD to prevent problems with chroot builds. In
|
||
particular, dietlibc cannot figure out the cwd because the
|
||
inode of the current directory doesn't appear in .. (because
|
||
getdents returns the inode of the mount point). */
|
||
ctx.env["PWD"] = tmpDirInSandbox;
|
||
|
||
/* *Only* if this is a fixed-output derivation, propagate the
|
||
values of the environment variables specified in the
|
||
`impureEnvVars' attribute to the builder. This allows for
|
||
instance environment variables for proxy configuration such as
|
||
`http_proxy' to be easily passed to downloaders like
|
||
`fetchurl'. Passing such environment variables from the caller
|
||
to the builder is generally impure, but the output of
|
||
fixed-output derivations is by definition pure (since we
|
||
already know the cryptographic hash of the output). */
|
||
if (fixedOutput) {
|
||
Strings varNames = tokenizeString<Strings>(get(drv.env, "impureEnvVars"));
|
||
for (auto& i : varNames) ctx.env[i] = getEnv(i);
|
||
}
|
||
|
||
/* The `exportReferencesGraph' feature allows the references graph
|
||
to be passed to a builder. This attribute should be a list of
|
||
pairs [name1 path1 name2 path2 ...]. The references graph of
|
||
each `pathN' will be stored in a text file `nameN' in the
|
||
temporary build directory. The text files have the format used
|
||
by `nix-store --register-validity'. However, the deriver
|
||
fields are left empty. */
|
||
string s = get(drv.env, "exportReferencesGraph");
|
||
Strings ss = tokenizeString<Strings>(s);
|
||
if (ss.size() % 2 != 0)
|
||
throw BuildError(format("odd number of tokens in `exportReferencesGraph': `%1%'") % s);
|
||
for (Strings::iterator i = ss.begin(); i != ss.end(); ) {
|
||
string fileName = *i++;
|
||
checkStoreName(fileName); /* !!! abuse of this function */
|
||
|
||
/* Check that the store path is valid. */
|
||
Path storePath = *i++;
|
||
if (!isInStore(storePath))
|
||
throw BuildError(format("`exportReferencesGraph' contains a non-store path `%1%'")
|
||
% storePath);
|
||
storePath = toStorePath(storePath);
|
||
if (!worker.store.isValidPath(storePath))
|
||
throw BuildError(format("`exportReferencesGraph' contains an invalid path `%1%'")
|
||
% storePath);
|
||
|
||
/* If there are derivations in the graph, then include their
|
||
outputs as well. This is useful if you want to do things
|
||
like passing all build-time dependencies of some path to a
|
||
derivation that builds a NixOS DVD image. */
|
||
PathSet paths, paths2;
|
||
computeFSClosure(worker.store, storePath, paths);
|
||
paths2 = paths;
|
||
|
||
for (auto& j : paths2) {
|
||
if (isDerivation(j)) {
|
||
Derivation drv = derivationFromPath(worker.store, j);
|
||
for (auto& k : drv.outputs)
|
||
computeFSClosure(worker.store, k.second.path, paths);
|
||
}
|
||
}
|
||
|
||
/* Write closure info to `fileName'. */
|
||
writeFile(tmpDir + "/" + fileName,
|
||
worker.store.makeValidityRegistration(paths, false, false));
|
||
}
|
||
|
||
|
||
/* If `build-users-group' is not empty, then we have to build as
|
||
one of the members of that group. */
|
||
if (settings.buildUsersGroup != "") {
|
||
buildUser.acquire();
|
||
assert(buildUser.getUID() != 0);
|
||
assert(buildUser.getGID() != 0);
|
||
|
||
/* Make sure that no other processes are executing under this
|
||
uid. */
|
||
buildUser.kill();
|
||
|
||
/* Change ownership of the temporary build directory. */
|
||
if (chown(tmpDir.c_str(), buildUser.getUID(), buildUser.getGID()) == -1)
|
||
throw SysError(format("cannot change ownership of '%1%'") % tmpDir);
|
||
|
||
ctx.setuid = true;
|
||
ctx.user = buildUser.getUID();
|
||
ctx.setgid = true;
|
||
ctx.group = buildUser.getGID();
|
||
ctx.setSupplementaryGroups = true;
|
||
ctx.supplementaryGroups = buildUser.getSupplementaryGIDs();
|
||
}
|
||
|
||
#if CHROOT_ENABLED
|
||
bool useSlirp4netns = false;
|
||
#endif
|
||
|
||
if (useChroot) {
|
||
#if CHROOT_ENABLED
|
||
ctx.phases = getCloneSpawnPhases();
|
||
addPhaseAfter(ctx.phases, "chroot", "clearRootWritePerms",
|
||
clearRootWritePermsAction);
|
||
/* Create a temporary directory in which we set up the chroot
|
||
environment using bind-mounts. Put it in the store to ensure it
|
||
can be atomically moved to the store. */
|
||
chrootRootTop = drvPath + ".chroot";
|
||
chrootRootDir = chrootRootTop + "/top";
|
||
if (pathExists(chrootRootTop)) deletePath(chrootRootTop);
|
||
|
||
/* Clean up the chroot directory automatically. */
|
||
autoDelChroot = std::shared_ptr<AutoDelete>(new AutoDelete(chrootRootTop));
|
||
|
||
if(fixedOutput) {
|
||
if(findProgram(settings.slirp4netns) == "")
|
||
printMsg(lvlError, format("`%1%' can't be found in PATH, network access disabled") % settings.slirp4netns);
|
||
else {
|
||
if(!pathExists("/dev/net/tun"))
|
||
printMsg(lvlError, "`/dev/net/tun' is missing, network access disabled");
|
||
else {
|
||
useSlirp4netns = true;
|
||
ctx.ipv6Enabled = haveGlobalIPv6Address();
|
||
}
|
||
}
|
||
}
|
||
|
||
ctx.doChroot = true;
|
||
ctx.chrootRootDir = chrootRootDir;
|
||
ctx.cloneFlags = CLONE_NEWNS | CLONE_NEWNET | CLONE_NEWPID | CLONE_NEWIPC | CLONE_NEWUTS | SIGCHLD;
|
||
|
||
if(!fixedOutput || /* redundant but shows the cases clearly */
|
||
(fixedOutput && !settings.useHostLoopback))
|
||
ctx.initLoopback = true;
|
||
|
||
if(!buildUser.enabled())
|
||
ctx.cloneFlags |= CLONE_NEWUSER;
|
||
|
||
/* Set the hostname etc. to fixed values. */
|
||
ctx.hostname = "localhost";
|
||
ctx.domainname = "(none)"; /* kernel default */
|
||
|
||
printMsg(lvlChatty, format("setting up chroot environment in `%1%'") % chrootRootDir);
|
||
|
||
if (mkdir(chrootRootTop.c_str(), 0750) == -1)
|
||
throw SysError(format("cannot create build root container '%1%'") % chrootRootTop);
|
||
if (mkdir(chrootRootDir.c_str(), 0750) == -1)
|
||
throw SysError(format("cannot create build root '%1%'") % chrootRootDir);
|
||
|
||
if (buildUser.enabled() && chown(chrootRootDir.c_str(), 0, buildUser.getGID()) == -1)
|
||
throw SysError(format("cannot change ownership of ‘%1%’") % chrootRootDir);
|
||
|
||
/* Create a writable /tmp in the chroot. Many builders need
|
||
this. (Of course they should really respect $TMPDIR
|
||
instead.) */
|
||
Path chrootTmpDir = chrootRootDir + "/tmp";
|
||
createDirs(chrootTmpDir);
|
||
chmod_(chrootTmpDir, 01777);
|
||
|
||
/* Create a /etc/passwd with entries for the build user and the
|
||
nobody account. The latter is kind of a hack to support
|
||
Samba-in-QEMU. */
|
||
createDirs(chrootRootDir + "/etc");
|
||
|
||
writeFile(chrootRootDir + "/etc/passwd",
|
||
(format(
|
||
"nixbld:x:%1%:%2%:Nix build user:/:/noshell\n"
|
||
"nobody:x:65534:65534:Nobody:/:/noshell\n")
|
||
% (buildUser.enabled() ? buildUser.getUID() : guestUID)
|
||
% (buildUser.enabled() ? buildUser.getGID() : guestGID)).str());
|
||
|
||
/* Declare the build user's group so that programs get a consistent
|
||
view of the system (e.g., "id -gn"). */
|
||
writeFile(chrootRootDir + "/etc/group",
|
||
(format("nixbld:!:%1%:\n")
|
||
% (buildUser.enabled() ? buildUser.getGID() : guestGID)).str());
|
||
|
||
if (fixedOutput) {
|
||
/* Fixed-output derivations typically need to access the network,
|
||
so give them access to /etc/resolv.conf and so on. */
|
||
std::vector<Path> files = { "/etc/services", "/etc/nsswitch.conf" };
|
||
if (useSlirp4netns) {
|
||
if (settings.useHostLoopback) {
|
||
string hosts;
|
||
if(pathExists("/etc/hosts")) {
|
||
hosts = readFile("/etc/hosts");
|
||
hosts = std::regex_replace(hosts, std::regex("127\\.0\\.0\\.1"), "10.0.2.2");
|
||
hosts = std::regex_replace(hosts, std::regex("::1"), "fd00::2");
|
||
} else {
|
||
hosts =
|
||
"10.0.2.2 localhost\n"
|
||
"fd00::2 localhost\n";
|
||
}
|
||
writeFile(chrootRootDir + "/etc/hosts", hosts);
|
||
}
|
||
else {
|
||
files.push_back("/etc/hosts");
|
||
}
|
||
writeFile(chrootRootDir + "/etc/resolv.conf", "nameserver 10.0.2.3");
|
||
}
|
||
else {
|
||
files.push_back("/etc/hosts");
|
||
files.push_back("/etc/resolv.conf");
|
||
}
|
||
for (auto & file : files) {
|
||
if (pathExists(file)) {
|
||
ctx.filesInChroot[file] = file;
|
||
ctx.readOnlyFilesInChroot.insert(file);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
/* Create /etc/hosts with localhost entry. */
|
||
writeFile(chrootRootDir + "/etc/hosts",
|
||
"127.0.0.1 localhost\n"
|
||
"::1 localhost\n");
|
||
|
||
/* Bind-mount a user-configurable set of directories from the
|
||
host file system. */
|
||
PathSet dirs = tokenizeString<StringSet>(settings.get("build-chroot-dirs", string(DEFAULT_CHROOT_DIRS)));
|
||
PathSet dirs2 = tokenizeString<StringSet>(settings.get("build-extra-chroot-dirs", string("")));
|
||
dirs.insert(dirs2.begin(), dirs2.end());
|
||
for (auto & i : dirs) {
|
||
size_t p = i.find('=');
|
||
if (p == string::npos)
|
||
ctx.filesInChroot[i] = i;
|
||
else
|
||
ctx.filesInChroot[string(i, 0, p)] = string(i, p + 1);
|
||
}
|
||
ctx.filesInChroot[tmpDirInSandbox] = tmpDir;
|
||
|
||
/* Create the fake store. */
|
||
Path chrootStoreDir = chrootRootDir + settings.nixStore;
|
||
createDirs(chrootStoreDir);
|
||
chmod_(chrootStoreDir, 01775);
|
||
|
||
if (buildUser.enabled() && chown(chrootStoreDir.c_str(), 0, buildUser.getGID()) == -1)
|
||
/* As an extra security precaution, make the fake store only
|
||
writable by the build user. */
|
||
throw SysError(format("cannot change ownership of ‘%1%’") % chrootStoreDir);
|
||
|
||
/* Make the closure of the inputs available in the chroot, rather than
|
||
the whole store. This prevents any access to undeclared
|
||
dependencies. */
|
||
for (auto& i : inputPaths) {
|
||
ctx.filesInChroot[i] = i;
|
||
ctx.readOnlyFilesInChroot.insert(i);
|
||
}
|
||
|
||
/* If we're repairing, checking or rebuilding part of a
|
||
multiple-outputs derivation, it's possible that we're
|
||
rebuilding a path that is in settings.dirsInChroot
|
||
(typically the dependencies of /bin/sh). Throw them
|
||
out. */
|
||
for (auto & i : drv.outputs)
|
||
ctx.filesInChroot.erase(i.second.path);
|
||
|
||
/* Set up a nearly empty /dev, unless the user asked to bind-mount the
|
||
host /dev. */
|
||
Strings ss;
|
||
if(ctx.filesInChroot.find("/dev") == ctx.filesInChroot.end()) {
|
||
createDirs(chrootRootDir + "/dev/shm");
|
||
createDirs(chrootRootDir + "/dev/pts");
|
||
ss.push_back("/dev/full");
|
||
#ifdef __linux__
|
||
if (pathExists("/dev/kvm"))
|
||
ss.push_back("/dev/kvm");
|
||
#endif
|
||
ss.push_back("/dev/null");
|
||
ss.push_back("/dev/random");
|
||
ss.push_back("/dev/tty");
|
||
ss.push_back("/dev/urandom");
|
||
ss.push_back("/dev/zero");
|
||
createSymlink("/proc/self/fd", chrootRootDir + "/dev/fd");
|
||
createSymlink("/proc/self/fd/0", chrootRootDir + "/dev/stdin");
|
||
createSymlink("/proc/self/fd/1", chrootRootDir + "/dev/stdout");
|
||
createSymlink("/proc/self/fd/2", chrootRootDir + "/dev/stderr");
|
||
}
|
||
|
||
for (auto & i : ss) ctx.filesInChroot[i] = i;
|
||
|
||
ctx.mountProc = true;
|
||
ctx.mountDevshm = true;
|
||
/* Mount a new devpts on /dev/pts. Note that this requires the kernel
|
||
to be compiled with CONFIG_DEVPTS_MULTIPLE_INSTANCES=y (which is
|
||
the case if /dev/ptx/ptmx exists). */
|
||
ctx.maybeMountDevpts =
|
||
pathExists("/dev/pts/ptmx") &&
|
||
ctx.filesInChroot.find("/dev/pts") == ctx.filesInChroot.end();
|
||
ctx.lockMounts = !buildUser.enabled();
|
||
|
||
for (auto & i : ctx.filesInChroot) {
|
||
/* Failsafe: If the source is in the store, it should be
|
||
read-only */
|
||
if(i.second.compare(0, settings.nixStore.length(), settings.nixStore) == 0) {
|
||
ctx.readOnlyFilesInChroot.insert(i.first);
|
||
}
|
||
}
|
||
#else
|
||
throw Error("chroot builds are not supported on this platform");
|
||
#endif
|
||
}
|
||
|
||
else {
|
||
ctx.phases = getBasicSpawnPhases();
|
||
|
||
if (pathExists(homeDir))
|
||
throw Error(format("directory `%1%' exists; please remove it") % homeDir);
|
||
|
||
/* We're not doing a chroot build, but we have some valid
|
||
output paths. Since we can't just overwrite or delete
|
||
them, we have to do hash rewriting: i.e. in the
|
||
environment/arguments passed to the build, we replace the
|
||
hashes of the valid outputs with unique dummy strings;
|
||
after the build, we discard the redirected outputs
|
||
corresponding to the valid outputs, and rewrite the
|
||
contents of the new outputs to replace the dummy strings
|
||
with the actual hashes. */
|
||
if (validPaths.size() > 0)
|
||
for (auto i : validPaths)
|
||
addHashRewrite(i);
|
||
|
||
/* If we're repairing, then we don't want to delete the
|
||
corrupt outputs in advance. So rewrite them as well. */
|
||
if (buildMode == bmRepair)
|
||
for (auto& i : missingPaths)
|
||
if (worker.store.isValidPath(i) && pathExists(i)) {
|
||
addHashRewrite(i);
|
||
redirectedBadOutputs.insert(i);
|
||
}
|
||
}
|
||
|
||
replacePhase(ctx.phases, "exec", execBuilderOrBuiltinAction);
|
||
|
||
/* Run the builder. */
|
||
printMsg(lvlChatty, format("executing builder `%1%'") % drv.builder);
|
||
|
||
/* Create the log file. */
|
||
Path logFile = openLogFile();
|
||
|
||
/* Create a pipe to get the output of the builder. */
|
||
builderOut.create();
|
||
|
||
ctx.logFD = builderOut.writeSide;
|
||
ctx.earlyCloseFDs.insert(builderOut.readSide);
|
||
|
||
/* Fork a child to build the package. Note that while we
|
||
currently use forks to run and wait for the children, it
|
||
shouldn't be hard to use threads for this on systems where
|
||
fork() is unavailable or inefficient.
|
||
|
||
If we're building in a chroot, then also set up private
|
||
namespaces for the build:
|
||
|
||
- The PID namespace causes the build to start as PID 1.
|
||
Processes outside of the chroot are not visible to those on
|
||
the inside, but processes inside the chroot are visible from
|
||
the outside (though with different PIDs).
|
||
|
||
- The private mount namespace ensures that all the bind mounts
|
||
we do will only show up in this process and its children, and
|
||
will disappear automatically when we're done.
|
||
|
||
- The private network namespace ensures that the builder cannot
|
||
talk to the outside world (or vice versa). It only has a
|
||
private loopback interface. As an exception, fixed-output
|
||
derivations may talk to the outside world through slirp4netns, but
|
||
still in a separate network namespace.
|
||
|
||
- The IPC namespace prevents the builder from communicating
|
||
with outside processes using SysV IPC mechanisms (shared
|
||
memory, message queues, semaphores). It also ensures that
|
||
all IPC objects are destroyed when the builder exits.
|
||
|
||
- The UTS namespace ensures that builders see a hostname of
|
||
localhost rather than the actual hostname.
|
||
*/
|
||
#if __linux__
|
||
if (useChroot) {
|
||
int fds[2];
|
||
AutoCloseFD parentSetupSocket;
|
||
AutoCloseFD childSetupSocket;
|
||
|
||
if(((ctx.cloneFlags & CLONE_NEWUSER) != 0) || useSlirp4netns) {
|
||
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, fds))
|
||
throw SysError("creating setup socket");
|
||
parentSetupSocket = fds[0];
|
||
closeOnExec(parentSetupSocket);
|
||
ctx.earlyCloseFDs.insert(parentSetupSocket);
|
||
childSetupSocket = fds[1];
|
||
closeOnExec(childSetupSocket);
|
||
ctx.setupFD = childSetupSocket;
|
||
}
|
||
|
||
if(useSlirp4netns) {
|
||
addPhaseAfter(ctx.phases, "initLoopback", "setupTap", setupTapAction);
|
||
addPhaseAfter(ctx.phases, "setupTap", "waitForSlirpReady",
|
||
waitForSlirpReadyAction);
|
||
if(settings.useHostLoopback)
|
||
addPhaseAfter(ctx.phases, "waitForSlirpReady", "enableRouteLocalnet",
|
||
enableRouteLocalnetAction);
|
||
}
|
||
|
||
pid = cloneChild(ctx);
|
||
|
||
if(childSetupSocket >= 0) childSetupSocket.close();
|
||
|
||
if ((ctx.cloneFlags & CLONE_NEWUSER) != 0) {
|
||
/* Initialize the UID/GID mapping of the builder. */
|
||
initializeUserNamespace(pid);
|
||
writeFull(parentSetupSocket, (unsigned char*)"go\n", 3);
|
||
}
|
||
|
||
try {
|
||
if(useSlirp4netns) {
|
||
AutoCloseFD tapfd = receiveFD(parentSetupSocket);
|
||
/* Start 'slirp4netns' to provide networking in the child process;
|
||
running the builder in the global network namespace would give
|
||
it access to the global namespace of abstract sockets, which
|
||
could be used to grant write access to the store to an external
|
||
process. */
|
||
slirp = spawnSlirp4netns(
|
||
tapfd,
|
||
parentSetupSocket,
|
||
/* Do whatever we can to run slirp4netns as some user
|
||
other than root - run it as the build user if
|
||
necessary */
|
||
buildUser.enabled() ? buildUser.getUID() : getuid(),
|
||
buildUser.enabled() ? buildUser.getGID() : getgid());
|
||
}
|
||
} catch(std::exception & e) {
|
||
if(slirp != -1) {
|
||
slirp.kill(true);
|
||
}
|
||
if(pid != -1) {
|
||
pid.kill(true);
|
||
}
|
||
throw e;
|
||
}
|
||
|
||
} else
|
||
#endif
|
||
{
|
||
pid = fork();
|
||
if (pid == 0) runChildSetup(ctx);
|
||
}
|
||
|
||
if (pid == -1) throw SysError("unable to fork");
|
||
|
||
/* parent */
|
||
pid.setSeparatePG(true);
|
||
builderOut.writeSide.close();
|
||
worker.childStarted(shared_from_this(), pid, std::set<int>{builderOut.readSide}, true, true);
|
||
|
||
/* Check if setting up the build environment failed. */
|
||
string msg = readLine(builderOut.readSide);
|
||
if (!msg.empty()) throw Error(msg);
|
||
|
||
if (settings.printBuildTrace) {
|
||
printMsg(lvlError, format("@ build-started %1% - %2% %3% %4%")
|
||
% drvPath % drv.platform % logFile % pid);
|
||
}
|
||
|
||
}
|
||
|
||
|
||
/* Parse a list of reference specifiers. Each element must either be
|
||
a store path, or the symbolic name of the output of the derivation
|
||
(such as `out'). */
|
||
PathSet parseReferenceSpecifiers(const Derivation & drv, string attr)
|
||
{
|
||
PathSet result;
|
||
Paths paths = tokenizeString<Paths>(attr);
|
||
for (auto& i : paths) {
|
||
if (isStorePath(i))
|
||
result.insert(i);
|
||
else if (drv.outputs.find(i) != drv.outputs.end())
|
||
result.insert(drv.outputs.find(i)->second.path);
|
||
else throw BuildError(
|
||
format("derivation contains an invalid reference specifier `%1%'")
|
||
% i);
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
void DerivationGoal::registerOutputs()
|
||
{
|
||
/* When using a build hook, the build hook can register the output
|
||
as valid (by doing `nix-store --import'). If so we don't have
|
||
to do anything here. */
|
||
if (hook) {
|
||
bool allValid = true;
|
||
for (auto& i : drv.outputs)
|
||
if (!worker.store.isValidPath(i.second.path)) allValid = false;
|
||
if (allValid) return;
|
||
}
|
||
|
||
ValidPathInfos infos;
|
||
|
||
/* Set of inodes seen during calls to canonicalisePathMetaData()
|
||
for this build's outputs. This needs to be shared between
|
||
outputs to allow hard links between outputs. */
|
||
InodesSeen inodesSeen;
|
||
|
||
Path checkSuffix = "-check";
|
||
|
||
/* Check whether the output paths were created, and grep each
|
||
output path to determine what other paths it references. Also make all
|
||
output paths read-only. */
|
||
for (auto& i : drv.outputs) {
|
||
Path path = i.second.path;
|
||
if (missingPaths.find(path) == missingPaths.end()) continue;
|
||
|
||
Path actualPath = path;
|
||
if (useChroot) {
|
||
actualPath = chrootRootDir + path;
|
||
} else {
|
||
Path redirected = redirectedOutputs[path];
|
||
if (buildMode == bmRepair
|
||
&& redirectedBadOutputs.find(path) != redirectedBadOutputs.end()
|
||
&& pathExists(redirected))
|
||
replaceValidPath(path, redirected);
|
||
if (buildMode == bmCheck && redirected != "")
|
||
actualPath = redirected;
|
||
}
|
||
|
||
struct stat st;
|
||
if (lstat(actualPath.c_str(), &st) == -1) {
|
||
if (errno == ENOENT)
|
||
throw BuildError(
|
||
format("builder for `%1%' failed to produce output path `%2%'")
|
||
% drvPath % path);
|
||
throw SysError(format("getting attributes of path `%1%'") % actualPath);
|
||
}
|
||
|
||
#ifndef __CYGWIN__
|
||
/* Check that the output is not group or world writable, as
|
||
that means that someone else can have interfered with the
|
||
build. Also, the output should be owned by the build
|
||
user. */
|
||
if ((!S_ISLNK(st.st_mode) && (st.st_mode & (S_IWGRP | S_IWOTH))) ||
|
||
(buildUser.enabled() && st.st_uid != buildUser.getUID()))
|
||
throw BuildError(format("suspicious ownership or permission on `%1%'; rejecting this build output") % path);
|
||
#endif
|
||
|
||
/* Apply hash rewriting if necessary. */
|
||
bool rewritten = false;
|
||
if (!rewritesFromTmp.empty()) {
|
||
printMsg(lvlError, format("warning: rewriting hashes in `%1%'; cross fingers") % path);
|
||
|
||
/* Canonicalise first. This ensures that the path we're
|
||
rewriting doesn't contain a hard link to /etc/shadow or
|
||
something like that. */
|
||
canonicalisePathMetaData(actualPath, buildUser.enabled() ? buildUser.getUID() : -1, inodesSeen);
|
||
|
||
/* FIXME: this is in-memory. */
|
||
StringSink sink;
|
||
dumpPath(actualPath, sink);
|
||
deletePath(actualPath);
|
||
sink.s = rewriteHashes(sink.s, rewritesFromTmp);
|
||
StringSource source(sink.s);
|
||
restorePath(actualPath, source);
|
||
|
||
rewritten = true;
|
||
}
|
||
|
||
startNest(nest, lvlTalkative,
|
||
format("scanning for references inside `%1%'") % path);
|
||
|
||
/* Check that fixed-output derivations produced the right
|
||
outputs (i.e., the content hash should match the specified
|
||
hash). */
|
||
if (i.second.hash != "") {
|
||
|
||
bool recursive; HashType ht; Hash h;
|
||
i.second.parseHashInfo(recursive, ht, h);
|
||
|
||
if (!recursive) {
|
||
/* The output path should be a regular file without
|
||
execute permission. */
|
||
if (!S_ISREG(st.st_mode) || (st.st_mode & S_IXUSR) != 0)
|
||
throw BuildError(
|
||
format("output path `%1% should be a non-executable regular file") % path);
|
||
}
|
||
|
||
/* Check the hash. */
|
||
Hash h2 = recursive ? hashPath(ht, actualPath).first : hashFile(ht, actualPath);
|
||
if (h != h2) {
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ hash-mismatch %1% %2% %3% %4%")
|
||
% path % i.second.hashAlgo
|
||
% printHash16or32(h) % printHash16or32(h2));
|
||
throw BuildError(format("hash mismatch for store item '%1%'") % path);
|
||
}
|
||
}
|
||
|
||
/* Get rid of all weird permissions. This also checks that
|
||
all files are owned by the build user, if applicable. */
|
||
canonicalisePathMetaData(actualPath,
|
||
buildUser.enabled() && !rewritten ? buildUser.getUID() : -1, inodesSeen);
|
||
|
||
if (useChroot) {
|
||
if (pathExists(actualPath)) {
|
||
/* Now that output paths have been canonicalized (in particular
|
||
there are no setuid files left), move them outside of the
|
||
chroot and to the store. */
|
||
if (buildMode == bmRepair)
|
||
replaceValidPath(path, actualPath);
|
||
else
|
||
if (buildMode != bmCheck) {
|
||
if (S_ISDIR(st.st_mode)) {
|
||
if (lstat(actualPath.c_str(), &st) == -1)
|
||
throw SysError(format("getting canonicalized permissions of directory `%1%'") % actualPath);
|
||
/* Change mode on the directory to allow for
|
||
rename(2). */
|
||
if (chmod(actualPath.c_str(), st.st_mode | 0700) == -1)
|
||
throw SysError(format("making `%1%' writable for move from chroot to store") % actualPath);
|
||
}
|
||
if (rename(actualPath.c_str(), path.c_str()) == -1)
|
||
throw SysError(format("moving build output `%1%' from the chroot to the store") % path);
|
||
if (S_ISDIR(st.st_mode) && chmod(path.c_str(), st.st_mode) == -1)
|
||
throw SysError(format("restoring permissions on directory `%1%'") % actualPath);
|
||
}
|
||
}
|
||
if (buildMode != bmCheck) actualPath = path;
|
||
}
|
||
|
||
/* For this output path, find the references to other paths
|
||
contained in it. Compute the SHA-256 NAR hash at the same
|
||
time. The hash is stored in the database so that we can
|
||
verify later on whether nobody has messed with the store. */
|
||
HashResult hash;
|
||
PathSet references = scanForReferences(actualPath, allPaths, hash);
|
||
|
||
if (buildMode == bmCheck) {
|
||
if (!store->isValidPath(path)) continue;
|
||
ValidPathInfo info = worker.store.queryPathInfo(path);
|
||
if (hash.first != info.hash) {
|
||
if (settings.keepFailed) {
|
||
Path dst = path + checkSuffix;
|
||
if (pathExists(dst)) deletePath(dst);
|
||
if (rename(actualPath.c_str(), dst.c_str()))
|
||
throw SysError(format("renaming `%1%' to `%2%'") % actualPath % dst);
|
||
throw Error(format("derivation `%1%' may not be deterministic: output `%2%' differs from `%3%'")
|
||
% drvPath % path % dst);
|
||
} else
|
||
throw Error(format("derivation `%1%' may not be deterministic: output `%2%' differs")
|
||
% drvPath % path);
|
||
}
|
||
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ build-succeeded %1% -") % drvPath);
|
||
|
||
continue;
|
||
}
|
||
|
||
/* For debugging, print out the referenced and unreferenced
|
||
paths. */
|
||
for (auto& i : inputPaths) {
|
||
PathSet::iterator j = references.find(i);
|
||
if (j == references.end())
|
||
debug(format("unreferenced input: `%1%'") % i);
|
||
else
|
||
debug(format("referenced input: `%1%'") % i);
|
||
}
|
||
|
||
/* Enforce `allowedReferences' and friends. */
|
||
auto checkRefs = [&](const string & attrName, bool allowed, bool recursive) {
|
||
if (drv.env.find(attrName) == drv.env.end()) return;
|
||
|
||
PathSet spec = parseReferenceSpecifiers(drv, get(drv.env, attrName));
|
||
|
||
PathSet used;
|
||
if (recursive) {
|
||
/* Our requisites are the union of the closures of our references. */
|
||
for (auto & i : references)
|
||
/* Don't call computeFSClosure on ourselves. */
|
||
if (actualPath != i)
|
||
computeFSClosure(worker.store, i, used);
|
||
} else
|
||
used = references;
|
||
|
||
for (auto & i : used)
|
||
if (allowed) {
|
||
if (spec.find(i) == spec.end())
|
||
throw BuildError(format("output (`%1%') is not allowed to refer to path `%2%'") % actualPath % i);
|
||
} else {
|
||
if (spec.find(i) != spec.end())
|
||
throw BuildError(format("output (`%1%') is not allowed to refer to path `%2%'") % actualPath % i);
|
||
}
|
||
};
|
||
|
||
checkRefs("allowedReferences", true, false);
|
||
checkRefs("allowedRequisites", true, true);
|
||
checkRefs("disallowedReferences", false, false);
|
||
checkRefs("disallowedRequisites", false, true);
|
||
|
||
if (curRound == nrRounds) {
|
||
worker.store.optimisePath(path); // FIXME: combine with scanForReferences()
|
||
|
||
worker.store.markContentsGood(path);
|
||
}
|
||
|
||
ValidPathInfo info;
|
||
info.path = path;
|
||
info.hash = hash.first;
|
||
info.narSize = hash.second;
|
||
info.references = references;
|
||
info.deriver = drvPath;
|
||
infos.push_back(info);
|
||
}
|
||
|
||
/* Compare the result with the previous round, and report which
|
||
path is different, if any.*/
|
||
if (curRound > 1 && prevInfos != infos) {
|
||
assert(prevInfos.size() == infos.size());
|
||
for (auto i = prevInfos.begin(), j = infos.begin(); i != prevInfos.end(); ++i, ++j)
|
||
if (!(*i == *j)) {
|
||
Path prev = i->path + checkSuffix;
|
||
if (pathExists(prev))
|
||
throw NotDeterministic(
|
||
format("output ‘%1%’ of ‘%2%’ differs from ‘%3%’ from previous round")
|
||
% i->path % drvPath % prev);
|
||
else
|
||
throw NotDeterministic(
|
||
format("output ‘%1%’ of ‘%2%’ differs from previous round")
|
||
% i->path % drvPath);
|
||
}
|
||
assert(false); // shouldn't happen
|
||
}
|
||
|
||
if (settings.keepFailed) {
|
||
for (auto & i : drv.outputs) {
|
||
Path prev = i.second.path + checkSuffix;
|
||
if (pathExists(prev)) deletePath(prev);
|
||
if (curRound < nrRounds) {
|
||
Path dst = i.second.path + checkSuffix;
|
||
if (rename(i.second.path.c_str(), dst.c_str()))
|
||
throw SysError(format("renaming ‘%1%’ to ‘%2%’") % i.second.path % dst);
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
if (curRound < nrRounds) {
|
||
prevInfos = infos;
|
||
return;
|
||
}
|
||
|
||
/* Register each output path as valid, and register the sets of
|
||
paths referenced by each of them. If there are cycles in the
|
||
outputs, this will fail. */
|
||
worker.store.registerValidPaths(infos);
|
||
}
|
||
|
||
|
||
string drvsLogDir = "drvs";
|
||
|
||
|
||
Path DerivationGoal::openLogFile()
|
||
{
|
||
logSize = 0;
|
||
|
||
if (!settings.keepLog) return "";
|
||
|
||
string baseName = baseNameOf(drvPath);
|
||
|
||
/* Create a log file. */
|
||
Path dir = (format("%1%/%2%/%3%/") % settings.nixLogDir % drvsLogDir % string(baseName, 0, 2)).str();
|
||
createDirs(dir);
|
||
|
||
switch (settings.logCompression)
|
||
{
|
||
case COMPRESSION_GZIP: {
|
||
Path logFileName = (format("%1%/%2%.gz") % dir % string(baseName, 2)).str();
|
||
AutoCloseFD fd = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
|
||
if (fd == -1) throw SysError(format("creating log file `%1%'") % logFileName);
|
||
closeOnExec(fd);
|
||
|
||
/* Note: FD will be closed by 'gzclose'. */
|
||
if (!(gzLogFile = gzdopen(fd.borrow(), "w")))
|
||
throw Error(format("cannot open compressed log file `%1%'") % logFileName);
|
||
|
||
gzbuffer(gzLogFile, 32768);
|
||
gzsetparams(gzLogFile, Z_BEST_COMPRESSION, Z_DEFAULT_STRATEGY);
|
||
|
||
return logFileName;
|
||
}
|
||
|
||
#if HAVE_BZLIB_H
|
||
case COMPRESSION_BZIP2: {
|
||
Path logFileName = (format("%1%/%2%.bz2") % dir % string(baseName, 2)).str();
|
||
AutoCloseFD fd = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
|
||
if (fd == -1) throw SysError(format("creating log file `%1%'") % logFileName);
|
||
closeOnExec(fd);
|
||
|
||
if (!(fLogFile = fdopen(fd.borrow(), "w")))
|
||
throw SysError(format("opening log file `%1%'") % logFileName);
|
||
|
||
int err;
|
||
if (!(bzLogFile = BZ2_bzWriteOpen(&err, fLogFile, 9, 0, 0)))
|
||
throw Error(format("cannot open compressed log file `%1%'") % logFileName);
|
||
|
||
return logFileName;
|
||
}
|
||
#endif
|
||
|
||
case COMPRESSION_NONE: {
|
||
Path logFileName = (format("%1%/%2%") % dir % string(baseName, 2)).str();
|
||
fdLogFile = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
|
||
if (fdLogFile == -1) throw SysError(format("creating log file `%1%'") % logFileName);
|
||
closeOnExec(fdLogFile);
|
||
return logFileName;
|
||
}
|
||
}
|
||
|
||
abort();
|
||
}
|
||
|
||
|
||
void DerivationGoal::closeLogFile()
|
||
{
|
||
if (gzLogFile) {
|
||
int err;
|
||
err = gzclose(gzLogFile);
|
||
gzLogFile = NULL;
|
||
if (err != Z_OK) throw Error(format("cannot close compressed log file (gzip error = %1%)") % err);
|
||
}
|
||
#if HAVE_BZLIB_H
|
||
else if (bzLogFile) {
|
||
int err;
|
||
BZ2_bzWriteClose(&err, bzLogFile, 0, 0, 0);
|
||
bzLogFile = 0;
|
||
if (err != BZ_OK) throw Error(format("cannot close compressed log file (BZip2 error = %1%)") % err);
|
||
}
|
||
#endif
|
||
|
||
if (fLogFile) {
|
||
fclose(fLogFile);
|
||
fLogFile = 0;
|
||
}
|
||
|
||
fdLogFile.close();
|
||
}
|
||
|
||
|
||
static void _chown(const Path & path, uid_t uid, gid_t gid)
|
||
{
|
||
checkInterrupt();
|
||
|
||
if (lchown(path.c_str(), uid, gid) == -1) {
|
||
throw SysError(format("change owner and group of `%1%'") % path);
|
||
}
|
||
struct stat st = lstat(path);
|
||
if (S_ISDIR(st.st_mode)) {
|
||
for (auto & i : readDirectory(path))
|
||
_chown(path + "/" + i.name, uid, gid);
|
||
}
|
||
}
|
||
|
||
|
||
void DerivationGoal::deleteTmpDir(bool force)
|
||
{
|
||
if (tmpDir != "") {
|
||
// When useChroot is true, tmpDir looks like
|
||
// "/tmp/guix-build-foo.drv-0/top". Its parent is root-owned.
|
||
string top;
|
||
if (useChroot) {
|
||
if (baseNameOf(tmpDir) != "top") abort();
|
||
top = dirOf(tmpDir);
|
||
} else top = tmpDir;
|
||
|
||
if (settings.keepFailed && !force) {
|
||
printMsg(lvlError,
|
||
format("note: keeping build directory `%2%'")
|
||
% drvPath % top);
|
||
chmod(tmpDir.c_str(), 0755);
|
||
|
||
// Change the ownership if clientUid is set. Never change the
|
||
// ownership or the group to "root" for security reasons.
|
||
if (settings.clientUid != (uid_t) -1 && settings.clientUid != 0) {
|
||
uid_t uid = settings.clientUid;
|
||
gid_t gid = settings.clientGid != 0 ? settings.clientGid : -1;
|
||
bool reown = false;
|
||
|
||
/* First remove setuid/setgid bits. Allow sockets and pipes
|
||
in the build directory. */
|
||
secureFilePerms(tmpDir, true);
|
||
|
||
try {
|
||
_chown(tmpDir, uid, gid);
|
||
|
||
if (getuid() != 0) {
|
||
/* If, without being root, the '_chown' call above
|
||
succeeded, then it means we have CAP_CHOWN. Retake
|
||
ownership of tmpDir itself so it can be renamed
|
||
below. */
|
||
reown = true;
|
||
}
|
||
|
||
} catch (SysError & e) {
|
||
/* When running as an unprivileged user and without
|
||
CAP_CHOWN, we cannot chown the build tree. Print a
|
||
message and keep going. */
|
||
printMsg(lvlInfo, format("cannot change ownership of build directory '%1%': %2%")
|
||
% tmpDir % strerror(e.errNo));
|
||
}
|
||
|
||
if (top != tmpDir) {
|
||
if (reown) chown(tmpDir.c_str(), getuid(), getgid());
|
||
|
||
// Rename tmpDir to its parent, with an intermediate step.
|
||
string pivot = top + ".pivot";
|
||
if (rename(top.c_str(), pivot.c_str()) == -1)
|
||
throw SysError("pivoting failed build tree");
|
||
if (rename((pivot + "/top").c_str(), top.c_str()) == -1)
|
||
throw SysError("renaming failed build tree");
|
||
|
||
if (reown)
|
||
/* Running unprivileged but with CAP_CHOWN. */
|
||
chown(top.c_str(), uid, gid);
|
||
|
||
rmdir(pivot.c_str());
|
||
}
|
||
}
|
||
}
|
||
else {
|
||
deletePath(tmpDir);
|
||
if (top != tmpDir) rmdir(dirOf(tmpDir).c_str());
|
||
}
|
||
tmpDir = "";
|
||
}
|
||
}
|
||
|
||
|
||
void DerivationGoal::handleChildOutput(int fd, const string & data)
|
||
{
|
||
string prefix;
|
||
|
||
if (settings.multiplexedBuildOutput) {
|
||
/* Print a prefix that allows clients to determine whether a message
|
||
comes from the daemon or from a build process, and in the latter
|
||
case, which build process it comes from. The PID here matches the
|
||
one given in "@ build-started" traces; it's shorter that the
|
||
derivation file name, hence this choice. */
|
||
prefix = "@ build-log "
|
||
+ std::to_string(pid < 0 ? hook->pid : pid)
|
||
+ " " + std::to_string(data.size()) + "\n";
|
||
}
|
||
|
||
if ((hook && fd == hook->builderOut.readSide) ||
|
||
(!hook && fd == builderOut.readSide))
|
||
{
|
||
logSize += data.size();
|
||
if (settings.maxLogSize && logSize > settings.maxLogSize) {
|
||
printMsg(lvlError,
|
||
format("%1% killed after writing more than %2% bytes of log output")
|
||
% getName() % settings.maxLogSize);
|
||
timedOut(); // not really a timeout, but close enough
|
||
return;
|
||
}
|
||
if (verbosity >= settings.buildVerbosity)
|
||
writeToStderr(prefix + data);
|
||
|
||
if (gzLogFile) {
|
||
if (data.size() > 0) {
|
||
int count, err;
|
||
count = gzwrite(gzLogFile, data.data(), data.size());
|
||
if (count == 0) throw Error(format("cannot write to compressed log file (gzip error = %1%)") % gzerror(gzLogFile, &err));
|
||
}
|
||
#if HAVE_BZLIB_H
|
||
} else if (bzLogFile) {
|
||
int err;
|
||
BZ2_bzWrite(&err, bzLogFile, (unsigned char *) data.data(), data.size());
|
||
if (err != BZ_OK) throw Error(format("cannot write to compressed log file (BZip2 error = %1%)") % err);
|
||
#endif
|
||
} else if (fdLogFile != -1)
|
||
writeFull(fdLogFile, data);
|
||
}
|
||
|
||
if (hook && fd == hook->fromAgent.readSide)
|
||
writeToStderr(prefix + data);
|
||
}
|
||
|
||
|
||
void DerivationGoal::handleEOF(int fd)
|
||
{
|
||
worker.wakeUp(shared_from_this());
|
||
}
|
||
|
||
|
||
PathSet DerivationGoal::checkPathValidity(bool returnValid, bool checkHash)
|
||
{
|
||
PathSet result;
|
||
for (auto& i : drv.outputs) {
|
||
if (!wantOutput(i.first, wantedOutputs)) continue;
|
||
bool good =
|
||
worker.store.isValidPath(i.second.path) &&
|
||
(!checkHash || worker.store.pathContentsGood(i.second.path));
|
||
if (good == returnValid) result.insert(i.second.path);
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
bool DerivationGoal::pathFailed(const Path & path)
|
||
{
|
||
if (!settings.cacheFailure) return false;
|
||
|
||
if (!worker.store.hasPathFailed(path)) return false;
|
||
|
||
printMsg(lvlError, format("builder for `%1%' failed previously (cached)") % path);
|
||
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ build-failed %1% - cached") % drvPath);
|
||
|
||
done(BuildResult::CachedFailure);
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
Path DerivationGoal::addHashRewrite(const Path & path)
|
||
{
|
||
string h1 = string(path, settings.nixStore.size() + 1, 32);
|
||
string h2 = string(printHash32(hashString(htSHA256, "rewrite:" + drvPath + ":" + path)), 0, 32);
|
||
Path p = settings.nixStore + "/" + h2 + string(path, settings.nixStore.size() + 33);
|
||
if (pathExists(p)) deletePath(p);
|
||
assert(path.size() == p.size());
|
||
rewritesToTmp[h1] = h2;
|
||
rewritesFromTmp[h2] = h1;
|
||
redirectedOutputs[path] = p;
|
||
printMsg(lvlChatty, format("output '%1%' redirected to '%2%'")
|
||
% path % p);
|
||
return p;
|
||
}
|
||
|
||
|
||
void DerivationGoal::done(BuildResult::Status status, const string & msg)
|
||
{
|
||
result.status = status;
|
||
result.errorMsg = msg;
|
||
amDone(result.success() ? ecSuccess : ecFailed);
|
||
if (result.status == BuildResult::TimedOut)
|
||
worker.timedOut = true;
|
||
if (result.status == BuildResult::PermanentFailure || result.status == BuildResult::CachedFailure)
|
||
worker.permanentFailure = true;
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
class SubstitutionGoal : public Goal
|
||
{
|
||
friend class Worker;
|
||
|
||
private:
|
||
/* The store path that should be realised through a substitute. */
|
||
Path storePath;
|
||
|
||
/* Path info returned by the substituter's query info operation. */
|
||
SubstitutablePathInfo info;
|
||
|
||
/* Lock on the store path. */
|
||
std::shared_ptr<PathLocks> outputLock;
|
||
|
||
/* Whether to try to repair a valid path. */
|
||
bool repair;
|
||
|
||
/* Location where we're downloading the substitute. Differs from
|
||
storePath when doing a repair. */
|
||
Path destPath;
|
||
|
||
typedef void (SubstitutionGoal::*GoalState)();
|
||
GoalState state;
|
||
|
||
/* The substituter. */
|
||
std::shared_ptr<Agent> substituter;
|
||
|
||
/* Either the empty string, or the status phrase returned by the
|
||
substituter. */
|
||
string status;
|
||
|
||
void tryNext();
|
||
|
||
public:
|
||
SubstitutionGoal(const Path & storePath, Worker & worker, bool repair = false);
|
||
~SubstitutionGoal();
|
||
|
||
void timedOut();
|
||
|
||
string key()
|
||
{
|
||
/* "a$" ensures substitution goals happen before derivation
|
||
goals. */
|
||
return "a$" + storePathToName(storePath) + "$" + storePath;
|
||
}
|
||
|
||
void work();
|
||
|
||
/* The states. */
|
||
void init();
|
||
void gotInfo();
|
||
void referencesValid();
|
||
void tryToRun();
|
||
void finished();
|
||
|
||
/* Callback used by the worker to write to the log. */
|
||
void handleChildOutput(int fd, const string & data);
|
||
void handleEOF(int fd);
|
||
|
||
Path getStorePath() { return storePath; }
|
||
};
|
||
|
||
|
||
SubstitutionGoal::SubstitutionGoal(const Path & storePath, Worker & worker, bool repair)
|
||
: Goal(worker)
|
||
, repair(repair)
|
||
{
|
||
this->storePath = storePath;
|
||
state = &SubstitutionGoal::init;
|
||
name = (format("substitution of `%1%'") % storePath).str();
|
||
trace("created");
|
||
}
|
||
|
||
|
||
SubstitutionGoal::~SubstitutionGoal()
|
||
{
|
||
if (substituter) worker.childTerminated(substituter->pid);
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::timedOut()
|
||
{
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ substituter-failed %1% timeout") % storePath);
|
||
if (substituter) {
|
||
pid_t savedPid = substituter->pid;
|
||
substituter.reset();
|
||
worker.childTerminated(savedPid);
|
||
}
|
||
amDone(ecFailed);
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::work()
|
||
{
|
||
(this->*state)();
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::init()
|
||
{
|
||
trace("init");
|
||
|
||
worker.store.addTempRoot(storePath);
|
||
|
||
/* If the path already exists we're done. */
|
||
if (!repair && worker.store.isValidPath(storePath)) {
|
||
amDone(ecSuccess);
|
||
return;
|
||
}
|
||
|
||
if (settings.readOnlyMode)
|
||
throw Error(format("cannot substitute path `%1%' - no write access to the store") % storePath);
|
||
|
||
tryNext();
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::tryNext()
|
||
{
|
||
trace("trying substituter");
|
||
|
||
SubstitutablePathInfos infos;
|
||
PathSet dummy{storePath};
|
||
worker.store.querySubstitutablePathInfos(dummy, infos);
|
||
SubstitutablePathInfos::iterator k = infos.find(storePath);
|
||
if (k == infos.end()) {
|
||
/* None left. Terminate this goal and let someone else deal
|
||
with it. */
|
||
debug(format("path `%1%' is required, but there is no substituter that can build it") % storePath);
|
||
/* Hack: don't indicate failure if there were no substituters.
|
||
In that case the calling derivation should just do a
|
||
build. */
|
||
amDone(ecNoSubstituters);
|
||
return;
|
||
}
|
||
|
||
/* Found a substitute. */
|
||
info = k->second;
|
||
|
||
/* To maintain the closure invariant, we first have to realise the
|
||
paths referenced by this one. */
|
||
for (auto& i : info.references)
|
||
if (i != storePath) /* ignore self-references */
|
||
addWaitee(worker.makeSubstitutionGoal(i));
|
||
|
||
if (waitees.empty()) /* to prevent hang (no wake-up event) */
|
||
referencesValid();
|
||
else
|
||
state = &SubstitutionGoal::referencesValid;
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::referencesValid()
|
||
{
|
||
trace("all references realised");
|
||
|
||
if (nrFailed > 0) {
|
||
debug(format("some references of path `%1%' could not be realised") % storePath);
|
||
amDone(nrNoSubstituters > 0 || nrIncompleteClosure > 0 ? ecIncompleteClosure : ecFailed);
|
||
return;
|
||
}
|
||
|
||
for (auto& i : info.references)
|
||
if (i != storePath) /* ignore self-references */
|
||
assert(worker.store.isValidPath(i));
|
||
|
||
state = &SubstitutionGoal::tryToRun;
|
||
worker.wakeUp(shared_from_this());
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::tryToRun()
|
||
{
|
||
trace("trying to run");
|
||
|
||
/* Make sure that we are allowed to start a build. Note that even
|
||
is maxBuildJobs == 0 (no local builds allowed), we still allow
|
||
a substituter to run. This is because substitutions cannot be
|
||
distributed to another machine via the build hook. */
|
||
if (worker.getNrLocalBuilds() >= (settings.maxBuildJobs == 0 ? 1 : settings.maxBuildJobs)) {
|
||
worker.waitForBuildSlot(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
/* Maybe a derivation goal has already locked this path
|
||
(exceedingly unlikely, since it should have used a substitute
|
||
first, but let's be defensive). */
|
||
outputLock.reset(); // make sure this goal's lock is gone
|
||
if (pathIsLockedByMe(storePath)) {
|
||
debug(format("restarting substitution of `%1%' because it's locked by another goal")
|
||
% storePath);
|
||
worker.waitForAnyGoal(shared_from_this());
|
||
return; /* restart in the tryToRun() state when another goal finishes */
|
||
}
|
||
|
||
/* Acquire a lock on the output path. */
|
||
outputLock = std::shared_ptr<PathLocks>(new PathLocks);
|
||
if (!outputLock->lockPaths(PathSet{storePath}, "", false)) {
|
||
worker.waitForAWhile(shared_from_this());
|
||
return;
|
||
}
|
||
|
||
/* Check again whether the path is invalid. */
|
||
if (!repair && worker.store.isValidPath(storePath)) {
|
||
debug(format("store path `%1%' has become valid") % storePath);
|
||
outputLock->setDeletion(true);
|
||
outputLock.reset();
|
||
amDone(ecSuccess);
|
||
return;
|
||
}
|
||
|
||
printMsg(lvlInfo, format("fetching path `%1%'...") % storePath);
|
||
|
||
destPath = repair ? storePath + ".tmp" : storePath;
|
||
|
||
/* Remove the (stale) output path if it exists. */
|
||
if (pathExists(destPath))
|
||
deletePath(destPath);
|
||
|
||
if (!worker.substituter) {
|
||
const Strings args = { "substitute", "--substitute" };
|
||
const std::map<string, string> env = {
|
||
{ "_NIX_OPTIONS",
|
||
settings.pack() + "deduplicate="
|
||
+ (settings.autoOptimiseStore ? "yes" : "no")
|
||
}
|
||
};
|
||
worker.substituter = std::make_shared<Agent>(settings.guixProgram, args, env);
|
||
}
|
||
|
||
/* Borrow the worker's substituter. */
|
||
if (!substituter) substituter.swap(worker.substituter);
|
||
|
||
/* Send the request to the substituter. */
|
||
writeLine(substituter->toAgent.writeSide,
|
||
(format("substitute %1% %2%") % storePath % destPath).str());
|
||
|
||
set<int> fds;
|
||
fds.insert(substituter->fromAgent.readSide);
|
||
fds.insert(substituter->builderOut.readSide);
|
||
worker.childStarted(shared_from_this(), substituter->pid, fds, true, true);
|
||
|
||
state = &SubstitutionGoal::finished;
|
||
|
||
if (settings.printBuildTrace)
|
||
/* The second element in the message used to be the name of the
|
||
substituter but we're left with only one. */
|
||
printMsg(lvlError, format("@ substituter-started %1% substitute") % storePath);
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::finished()
|
||
{
|
||
trace("substitute finished");
|
||
|
||
/* Remove the 'guix substitute' process from the list of children. */
|
||
worker.childTerminated(substituter->pid);
|
||
|
||
/* If max-jobs > 1, the worker might have created a new 'substitute'
|
||
process in the meantime. If that is the case, terminate ours;
|
||
otherwise, give it back to the worker. */
|
||
if (worker.substituter) {
|
||
substituter.reset ();
|
||
} else {
|
||
worker.substituter.swap(substituter);
|
||
}
|
||
|
||
/* Check the exit status and the build result. */
|
||
HashResult hash;
|
||
try {
|
||
auto statusList = tokenizeString<vector<string> >(status);
|
||
|
||
if (statusList.empty()) {
|
||
throw SubstError(format("fetching path `%1%' (empty status)")
|
||
% storePath);
|
||
} else if (statusList[0] == "hash-mismatch") {
|
||
if (settings.printBuildTrace) {
|
||
auto hashType = statusList[1];
|
||
auto expectedHash = statusList[2];
|
||
auto actualHash = statusList[3];
|
||
printMsg(lvlError, format("@ hash-mismatch %1% %2% %3% %4%")
|
||
% storePath
|
||
% hashType % expectedHash % actualHash);
|
||
}
|
||
throw SubstError(format("hash mismatch for substituted item `%1%'") % storePath);
|
||
} else if (statusList[0] == "success") {
|
||
if (!pathExists(destPath))
|
||
throw SubstError(format("substitute did not produce path `%1%'") % destPath);
|
||
|
||
std::string hashStr = statusList[1];
|
||
size_t n = hashStr.find(':');
|
||
if (n == string::npos)
|
||
throw Error(format("bad hash from substituter: %1%") % hashStr);
|
||
|
||
HashType hashType = parseHashType(string(hashStr, 0, n));
|
||
switch (hashType) {
|
||
case htUnknown:
|
||
throw Error(format("unknown hash algorithm in `%1%'") % hashStr);
|
||
case htSHA256:
|
||
hash.first = parseHash16or32(hashType, string(hashStr, n + 1));
|
||
if (!string2Int(statusList[2], hash.second))
|
||
throw Error(format("invalid nar size for '%1%' substitute") % storePath);
|
||
break;
|
||
default:
|
||
/* The database only stores SHA256 hashes, so compute it. */
|
||
hash = hashPath(htSHA256, destPath);
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
throw SubstError(format("fetching path `%1%' (status: '%2%')")
|
||
% storePath % status);
|
||
|
||
} catch (SubstError & e) {
|
||
|
||
printMsg(lvlInfo, e.msg());
|
||
|
||
if (settings.printBuildTrace) {
|
||
printMsg(lvlError, format("@ substituter-failed %1% %2% %3%")
|
||
% storePath % status % e.msg());
|
||
}
|
||
|
||
amDone(ecFailed);
|
||
return;
|
||
}
|
||
|
||
if (repair) replaceValidPath(storePath, destPath);
|
||
|
||
/* Note: 'guix substitute' takes care of resetting timestamps and of
|
||
deduplicating 'destPath', so no need to do it here. */
|
||
|
||
ValidPathInfo info2;
|
||
info2.path = storePath;
|
||
info2.hash = hash.first;
|
||
info2.narSize = hash.second;
|
||
info2.references = info.references;
|
||
info2.deriver = info.deriver;
|
||
worker.store.registerValidPath(info2);
|
||
|
||
outputLock->setDeletion(true);
|
||
outputLock.reset();
|
||
|
||
worker.store.markContentsGood(storePath);
|
||
|
||
printMsg(lvlChatty,
|
||
format("substitution of path `%1%' succeeded") % storePath);
|
||
|
||
if (settings.printBuildTrace)
|
||
printMsg(lvlError, format("@ substituter-succeeded %1%") % storePath);
|
||
|
||
amDone(ecSuccess);
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::handleChildOutput(int fd, const string & data)
|
||
{
|
||
if (verbosity >= settings.buildVerbosity
|
||
&& fd == substituter->fromAgent.readSide) {
|
||
writeToStderr(data);
|
||
/* Don't write substitution output to a log file for now. We
|
||
probably should, though. */
|
||
}
|
||
|
||
if (fd == substituter->builderOut.readSide) {
|
||
/* DATA may consist of several lines. Process them one by one. */
|
||
string input = data;
|
||
while (!input.empty()) {
|
||
/* Process up to the first newline. */
|
||
size_t end = input.find_first_of("\n");
|
||
string trimmed = (end != string::npos) ? input.substr(0, end) : input;
|
||
|
||
/* Update the goal's state accordingly. */
|
||
if (status == "") {
|
||
status = trimmed;
|
||
worker.wakeUp(shared_from_this());
|
||
} else {
|
||
printMsg(lvlError, format("unexpected substituter message '%1%'") % input);
|
||
}
|
||
|
||
input = (end != string::npos) ? input.substr(end + 1) : "";
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
void SubstitutionGoal::handleEOF(int fd)
|
||
{
|
||
worker.wakeUp(shared_from_this());
|
||
}
|
||
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
static bool working = false;
|
||
|
||
|
||
Worker::Worker(LocalStore & store)
|
||
: store(store)
|
||
{
|
||
/* Debugging: prevent recursive workers. */
|
||
if (working) abort();
|
||
working = true;
|
||
nrLocalBuilds = 0;
|
||
lastWokenUp = 0;
|
||
permanentFailure = false;
|
||
timedOut = false;
|
||
}
|
||
|
||
|
||
Worker::~Worker()
|
||
{
|
||
working = false;
|
||
|
||
/* Explicitly get rid of all strong pointers now. After this all
|
||
goals that refer to this worker should be gone. (Otherwise we
|
||
are in trouble, since goals may call childTerminated() etc. in
|
||
their destructors). */
|
||
topGoals.clear();
|
||
}
|
||
|
||
|
||
GoalPtr Worker::makeDerivationGoal(const Path & path,
|
||
const StringSet & wantedOutputs, BuildMode buildMode)
|
||
{
|
||
GoalPtr goal = derivationGoals[path].lock();
|
||
if (!goal) {
|
||
goal = GoalPtr(new DerivationGoal(path, wantedOutputs, *this, buildMode));
|
||
derivationGoals[path] = goal;
|
||
wakeUp(goal);
|
||
} else
|
||
(dynamic_cast<DerivationGoal *>(goal.get()))->addWantedOutputs(wantedOutputs);
|
||
return goal;
|
||
}
|
||
|
||
|
||
GoalPtr Worker::makeSubstitutionGoal(const Path & path, bool repair)
|
||
{
|
||
GoalPtr goal = substitutionGoals[path].lock();
|
||
if (!goal) {
|
||
goal = GoalPtr(new SubstitutionGoal(path, *this, repair));
|
||
substitutionGoals[path] = goal;
|
||
wakeUp(goal);
|
||
}
|
||
return goal;
|
||
}
|
||
|
||
|
||
static void removeGoal(GoalPtr goal, WeakGoalMap & goalMap)
|
||
{
|
||
/* !!! inefficient */
|
||
for (WeakGoalMap::iterator i = goalMap.begin();
|
||
i != goalMap.end(); )
|
||
if (i->second.lock() == goal) {
|
||
WeakGoalMap::iterator j = i; ++j;
|
||
goalMap.erase(i);
|
||
i = j;
|
||
}
|
||
else ++i;
|
||
}
|
||
|
||
|
||
void Worker::removeGoal(GoalPtr goal)
|
||
{
|
||
nix::removeGoal(goal, derivationGoals);
|
||
nix::removeGoal(goal, substitutionGoals);
|
||
if (topGoals.find(goal) != topGoals.end()) {
|
||
topGoals.erase(goal);
|
||
/* If a top-level goal failed, then kill all other goals
|
||
(unless keepGoing was set). */
|
||
if (goal->getExitCode() == Goal::ecFailed && !settings.keepGoing)
|
||
topGoals.clear();
|
||
}
|
||
|
||
/* Wake up goals waiting for any goal to finish. */
|
||
for (auto& i : waitingForAnyGoal) {
|
||
GoalPtr goal = i.lock();
|
||
if (goal) wakeUp(goal);
|
||
}
|
||
|
||
waitingForAnyGoal.clear();
|
||
}
|
||
|
||
|
||
void Worker::wakeUp(GoalPtr goal)
|
||
{
|
||
goal->trace("woken up");
|
||
addToWeakGoals(awake, goal);
|
||
}
|
||
|
||
|
||
unsigned Worker::getNrLocalBuilds()
|
||
{
|
||
return nrLocalBuilds;
|
||
}
|
||
|
||
|
||
void Worker::childStarted(GoalPtr goal,
|
||
pid_t pid, const set<int> & fds, bool inBuildSlot,
|
||
bool respectTimeouts)
|
||
{
|
||
Child child;
|
||
child.goal = goal;
|
||
child.fds = fds;
|
||
child.timeStarted = child.lastOutput = time(0);
|
||
child.inBuildSlot = inBuildSlot;
|
||
child.respectTimeouts = respectTimeouts;
|
||
children[pid] = child;
|
||
if (inBuildSlot) nrLocalBuilds++;
|
||
}
|
||
|
||
|
||
void Worker::childTerminated(pid_t pid, bool wakeSleepers)
|
||
{
|
||
assert(pid != -1); /* common mistake */
|
||
|
||
Children::iterator i = children.find(pid);
|
||
assert(i != children.end());
|
||
|
||
if (i->second.inBuildSlot) {
|
||
assert(nrLocalBuilds > 0);
|
||
nrLocalBuilds--;
|
||
}
|
||
|
||
children.erase(pid);
|
||
|
||
if (wakeSleepers) {
|
||
|
||
/* Wake up goals waiting for a build slot. */
|
||
for (auto& i : wantingToBuild) {
|
||
GoalPtr goal = i.lock();
|
||
if (goal) wakeUp(goal);
|
||
}
|
||
|
||
wantingToBuild.clear();
|
||
}
|
||
}
|
||
|
||
|
||
void Worker::waitForBuildSlot(GoalPtr goal)
|
||
{
|
||
debug("wait for build slot");
|
||
if (getNrLocalBuilds() < settings.maxBuildJobs)
|
||
wakeUp(goal); /* we can do it right away */
|
||
else
|
||
addToWeakGoals(wantingToBuild, goal);
|
||
}
|
||
|
||
|
||
void Worker::waitForAnyGoal(GoalPtr goal)
|
||
{
|
||
debug("wait for any goal");
|
||
addToWeakGoals(waitingForAnyGoal, goal);
|
||
}
|
||
|
||
|
||
void Worker::waitForAWhile(GoalPtr goal)
|
||
{
|
||
debug("wait for a while");
|
||
addToWeakGoals(waitingForAWhile, goal);
|
||
}
|
||
|
||
|
||
void Worker::run(const Goals & _topGoals)
|
||
{
|
||
for (auto& i : _topGoals) topGoals.insert(i);
|
||
|
||
startNest(nest, lvlDebug, format("entered goal loop"));
|
||
|
||
while (1) {
|
||
|
||
checkInterrupt();
|
||
|
||
/* Call every wake goal (in the ordering established by
|
||
CompareGoalPtrs). */
|
||
while (!awake.empty() && !topGoals.empty()) {
|
||
Goals awake2;
|
||
for (auto & i : awake) {
|
||
GoalPtr goal = i.lock();
|
||
if (goal) awake2.insert(goal);
|
||
}
|
||
awake.clear();
|
||
for (auto & goal : awake2) {
|
||
checkInterrupt();
|
||
goal->work();
|
||
if (topGoals.empty()) break; // stuff may have been cancelled
|
||
}
|
||
}
|
||
|
||
if (topGoals.empty()) break;
|
||
|
||
/* Wait for input. */
|
||
if (!children.empty() || !waitingForAWhile.empty())
|
||
waitForInput();
|
||
else {
|
||
if (awake.empty() && settings.maxBuildJobs == 0) throw Error(
|
||
"unable to start any build; either increase `--max-jobs' "
|
||
"or enable distributed builds");
|
||
assert(!awake.empty());
|
||
}
|
||
}
|
||
|
||
/* If --keep-going is not set, it's possible that the main goal
|
||
exited while some of its subgoals were still active. But if
|
||
--keep-going *is* set, then they must all be finished now. */
|
||
assert(!settings.keepGoing || awake.empty());
|
||
assert(!settings.keepGoing || wantingToBuild.empty());
|
||
assert(!settings.keepGoing || children.empty());
|
||
}
|
||
|
||
|
||
void Worker::waitForInput()
|
||
{
|
||
printMsg(lvlVomit, "waiting for children");
|
||
|
||
/* Process output from the file descriptors attached to the
|
||
children, namely log output and output path creation commands.
|
||
We also use this to detect child termination: if we get EOF on
|
||
the logger pipe of a build, we assume that the builder has
|
||
terminated. */
|
||
|
||
bool useTimeout = false;
|
||
struct timeval timeout;
|
||
timeout.tv_usec = 0;
|
||
time_t before = time(0);
|
||
|
||
/* If we're monitoring for silence on stdout/stderr, or if there
|
||
is a build timeout, then wait for input until the first
|
||
deadline for any child. */
|
||
assert(sizeof(time_t) >= sizeof(long));
|
||
time_t nearest = LONG_MAX; // nearest deadline
|
||
for (auto& i : children) {
|
||
if (!i.second.respectTimeouts) continue;
|
||
if (settings.maxSilentTime != 0)
|
||
nearest = std::min(nearest, i.second.lastOutput + settings.maxSilentTime);
|
||
if (settings.buildTimeout != 0)
|
||
nearest = std::min(nearest, i.second.timeStarted + settings.buildTimeout);
|
||
}
|
||
if (nearest != LONG_MAX) {
|
||
timeout.tv_sec = std::max((time_t) 1, nearest - before);
|
||
useTimeout = true;
|
||
printMsg(lvlVomit, format("sleeping %1% seconds") % timeout.tv_sec);
|
||
}
|
||
|
||
/* If we are polling goals that are waiting for a lock, then wake
|
||
up after a few seconds at most. */
|
||
if (!waitingForAWhile.empty()) {
|
||
useTimeout = true;
|
||
if (lastWokenUp == 0)
|
||
printMsg(lvlError, "waiting for locks or build slots...");
|
||
if (lastWokenUp == 0 || lastWokenUp > before) lastWokenUp = before;
|
||
timeout.tv_sec = std::max((time_t) 1, (time_t) (lastWokenUp + settings.pollInterval - before));
|
||
} else lastWokenUp = 0;
|
||
|
||
using namespace std;
|
||
/* Use select() to wait for the input side of any logger pipe to
|
||
become `available'. Note that `available' (i.e., non-blocking)
|
||
includes EOF. */
|
||
fd_set fds;
|
||
FD_ZERO(&fds);
|
||
int fdMax = 0;
|
||
for (auto& i : children) {
|
||
for (auto& j : i.second.fds) {
|
||
FD_SET(j, &fds);
|
||
if (j >= fdMax) fdMax = j + 1;
|
||
}
|
||
}
|
||
|
||
if (select(fdMax, &fds, 0, 0, useTimeout ? &timeout : 0) == -1) {
|
||
if (errno == EINTR) return;
|
||
throw SysError("waiting for input");
|
||
}
|
||
|
||
time_t after = time(0);
|
||
|
||
/* Process all available file descriptors. */
|
||
|
||
/* Since goals may be canceled from inside the loop below (causing
|
||
them go be erased from the `children' map), we have to be
|
||
careful that we don't keep iterators alive across calls to
|
||
timedOut(). */
|
||
set<pid_t> pids;
|
||
for (auto& i : children) pids.insert(i.first);
|
||
|
||
for (auto& i : pids) {
|
||
checkInterrupt();
|
||
Children::iterator j = children.find(i);
|
||
if (j == children.end()) continue; // child destroyed
|
||
GoalPtr goal = j->second.goal.lock();
|
||
assert(goal);
|
||
|
||
set<int> fds2(j->second.fds);
|
||
for (auto& k : fds2) {
|
||
if (FD_ISSET(k, &fds)) {
|
||
unsigned char buffer[4096];
|
||
ssize_t rd = read(k, buffer, sizeof(buffer));
|
||
if (rd == -1) {
|
||
if (errno != EINTR)
|
||
throw SysError(format("reading from %1%")
|
||
% goal->getName());
|
||
} else if (rd == 0) {
|
||
debug(format("%1%: got EOF") % goal->getName());
|
||
goal->handleEOF(k);
|
||
j->second.fds.erase(k);
|
||
} else {
|
||
printMsg(lvlVomit, format("%1%: read %2% bytes")
|
||
% goal->getName() % rd);
|
||
string data((char *) buffer, rd);
|
||
j->second.lastOutput = after;
|
||
goal->handleChildOutput(k, data);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (goal->getExitCode() == Goal::ecBusy &&
|
||
settings.maxSilentTime != 0 &&
|
||
j->second.respectTimeouts &&
|
||
after - j->second.lastOutput >= (time_t) settings.maxSilentTime)
|
||
{
|
||
printMsg(lvlError,
|
||
format("%1% timed out after %2% seconds of silence")
|
||
% goal->getName() % settings.maxSilentTime);
|
||
goal->timedOut();
|
||
}
|
||
|
||
else if (goal->getExitCode() == Goal::ecBusy &&
|
||
settings.buildTimeout != 0 &&
|
||
j->second.respectTimeouts &&
|
||
after - j->second.timeStarted >= (time_t) settings.buildTimeout)
|
||
{
|
||
printMsg(lvlError,
|
||
format("%1% timed out after %2% seconds")
|
||
% goal->getName() % settings.buildTimeout);
|
||
goal->timedOut();
|
||
}
|
||
}
|
||
|
||
if (!waitingForAWhile.empty() && lastWokenUp + settings.pollInterval <= after) {
|
||
lastWokenUp = after;
|
||
for (auto& i : waitingForAWhile) {
|
||
GoalPtr goal = i.lock();
|
||
if (goal) wakeUp(goal);
|
||
}
|
||
waitingForAWhile.clear();
|
||
}
|
||
}
|
||
|
||
|
||
unsigned int Worker::exitStatus()
|
||
{
|
||
return timedOut ? 101 : (permanentFailure ? 100 : 1);
|
||
}
|
||
|
||
|
||
//////////////////////////////////////////////////////////////////////
|
||
|
||
|
||
void LocalStore::buildPaths(const PathSet & drvPaths, BuildMode buildMode)
|
||
{
|
||
startNest(nest, lvlDebug,
|
||
format("building %1%") % showPaths(drvPaths));
|
||
|
||
Worker worker(*this);
|
||
|
||
Goals goals;
|
||
for (auto& i : drvPaths) {
|
||
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(i);
|
||
if (isDerivation(i2.first))
|
||
goals.insert(worker.makeDerivationGoal(i2.first, i2.second, buildMode));
|
||
else
|
||
goals.insert(worker.makeSubstitutionGoal(i, buildMode));
|
||
}
|
||
|
||
worker.run(goals);
|
||
|
||
PathSet failed;
|
||
for (auto& i : goals)
|
||
if (i->getExitCode() == Goal::ecFailed) {
|
||
DerivationGoal * i2 = dynamic_cast<DerivationGoal *>(i.get());
|
||
if (i2) failed.insert(i2->getDrvPath());
|
||
else failed.insert(dynamic_cast<SubstitutionGoal *>(i.get())->getStorePath());
|
||
}
|
||
|
||
if (!failed.empty())
|
||
throw Error(format("build of %1% failed") % showPaths(failed), worker.exitStatus());
|
||
}
|
||
|
||
|
||
void LocalStore::ensurePath(const Path & path)
|
||
{
|
||
/* If the path is already valid, we're done. */
|
||
if (isValidPath(path)) return;
|
||
|
||
Worker worker(*this);
|
||
GoalPtr goal = worker.makeSubstitutionGoal(path);
|
||
Goals goals{goal};
|
||
|
||
worker.run(goals);
|
||
|
||
if (goal->getExitCode() != Goal::ecSuccess)
|
||
throw Error(format("path `%1%' does not exist and cannot be created") % path, worker.exitStatus());
|
||
}
|
||
|
||
|
||
void LocalStore::repairPath(const Path & path)
|
||
{
|
||
Worker worker(*this);
|
||
GoalPtr goal = worker.makeSubstitutionGoal(path, true);
|
||
Goals goals{goal};
|
||
|
||
worker.run(goals);
|
||
|
||
if (goal->getExitCode() != Goal::ecSuccess) {
|
||
/* Since substituting the path didn't work, if we have a valid
|
||
deriver, then rebuild the deriver. */
|
||
Path deriver = queryDeriver(path);
|
||
if (deriver != "" && isValidPath(deriver)) {
|
||
goals.clear();
|
||
goals.insert(worker.makeDerivationGoal(deriver, StringSet(), bmRepair));
|
||
worker.run(goals);
|
||
} else
|
||
throw Error(format("cannot repair path `%1%'") % path, worker.exitStatus());
|
||
}
|
||
}
|
||
|
||
|
||
}
|