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daemon: Use the guest GID in /etc/group.

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Partly fixes <https://issues.guix.gnu.org/77862>.

Fixes a bug whereby, when running guix-daemon unprivileged, /etc/group
would contain the wrong GID for the “nixbld” group.  This inconsistency
would lead to failures in the Coreutils test suite, for instance.

* nix/libstore/build.cc (DerivationGoal::startBuilder): Use ‘guestGID’
when writing /etc/group.
* tests/store.scm ("/etc/passwd and /etc/group"): New test.

Reported-by: keinflue <keinflue@posteo.net>
Change-Id: I739bc96c4c935fd9015a45e2bfe5b3e3f90554a9
This commit is contained in:
Ludovic Courtès 2025-04-25 20:17:17 +02:00
parent 5529636006
commit 0d3bc50b0c
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2 changed files with 23 additions and 1 deletions
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nix/libstore/build.cc
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@ -1854,7 +1854,7 @@ void DerivationGoal::startBuilder()
view of the system (e.g., "id -gn"). */
writeFile(chrootRootDir + "/etc/group",
(format("nixbld:!:%1%:\n")
% (buildUser.enabled() ? buildUser.getGID() : getgid())).str());
% (buildUser.enabled() ? buildUser.getGID() : guestGID)).str());
/* Create /etc/hosts with localhost entry. */
if (!fixedOutput)