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This mitigates a race condition described in #576. The 'Type=exec' option ensures that systemd only starts follow-up units after the guix-daemon binary has started. By then, the mount points are collected in a private namespace and will not be affected. Without this option, 'gnu-store.mount' could win the race and remount everything read-only before guix-daemon has acquired a read-write view. Fixes #2270 * etc/guix-daemon.service.in: Mitigate mount race condition Change-Id: I5d28ebc38b0c10e6d2aa8e65353757ef13d5bad3 Signed-off-by: Ludovic Courtès <ludo@gnu.org>
54 lines
2 KiB
SYSTEMD
54 lines
2 KiB
SYSTEMD
# This is a "service unit file" for the systemd init system to launch
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# 'guix-daemon'. Drop it in /etc/systemd/system or similar to have
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# 'guix-daemon' automatically started.
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[Unit]
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Description=Build daemon for GNU Guix
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# Start before 'gnu-store.mount' to get a writable view of the store.
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Before=gnu-store.mount
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[Service]
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ExecStart=@localstatedir@/guix/profiles/per-user/root/current-guix/bin/guix-daemon \
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--discover=no \
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--substitute-urls='@GUIX_SUBSTITUTE_URLS@'
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Environment='GUIX_STATE_DIRECTORY=@localstatedir@/guix' 'GUIX_LOCPATH=@localstatedir@/guix/profiles/per-user/root/guix-profile/lib/locale' LC_ALL=en_US.utf8
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# Run under a dedicated unprivileged user account.
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User=guix-daemon
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# Bind-mount the store read-write in a private namespace, to counter the
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# effect of 'gnu-store.mount'.
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PrivateMounts=true
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BindPaths=@storedir@
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# Disable host file system mount propagation to keep service view of the
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# store read-write after 'gnu-store.mount' makes it read-only system-wide.
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MountFlags=private
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# Mitigate race condition between guix-daemon and 'gnu-store.mount'.
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# Dependent units will only start after daemon binary is started AND THUS
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# the mount point is acquired in a private namespace.
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Type=exec
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# Provide the CAP_CHOWN capability so that guix-daemon can create and chown
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# /var/guix/profiles/per-user/$USER and also chown failed build directories
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# when using '--keep-failed'. Note that guix-daemon explicitly drops ambient
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# capabilities before executing build processes so they don't inherit them.
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AmbientCapabilities=CAP_CHOWN
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StandardOutput=journal
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StandardError=journal
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# Work around a nasty systemd ‘feature’ that kills the entire process tree
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# (including the daemon!) if any child, such as cc1plus, runs out of memory.
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OOMPolicy=continue
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# Despite the name, this is rate-limited: a broken daemon will eventually fail.
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Restart=always
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# See <https://lists.gnu.org/archive/html/guix-devel/2016-04/msg00608.html>.
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# Some package builds (for example, go@1.8.1) may require even more than
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# 1024 tasks.
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TasksMax=8192
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[Install]
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WantedBy=multi-user.target
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