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contrib: dracut: zfs-snapshot-bootfs: exit status fix

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When the zfs-snapshot-bootfs service attempts to create a snapshot 
that already exists, the exit status of the command is non-zero and 
the service reports failed to the systemd service manager. This is a 
common occurrence if bootfs.snapshot is left set on the kernel command 
line and it should not be considered a failure. 
 
This service was originally set to ignore this error by prefixing 
the command with - on the ExecStart line, but the leading - appears 
to have been dropped in #13359.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Gregory Bartholomew <gregory.lee.bartholomew@gmail.com>
Closes #13769
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gregory-lee-bartholomew 2022-08-12 16:28:15 -05:00 committed by GitHub
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commit d22dd77c4d
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contrib/dracut/90zfs/zfs-snapshot-bootfs.service.in
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@ -8,5 +8,5 @@ ConditionKernelCommandLine=bootfs.snapshot
[Service] [Service]
Type=oneshot Type=oneshot
ExecStart=/bin/sh -c '. /lib/dracut-zfs-lib.sh; decode_root_args || exit; [ "$root" = "zfs:AUTO" ] && root="$BOOTFS"; SNAPNAME="$(getarg bootfs.snapshot)"; exec @sbindir@/zfs snapshot "$root@${SNAPNAME:-%v}"' ExecStart=-/bin/sh -c '. /lib/dracut-zfs-lib.sh; decode_root_args || exit; [ "$root" = "zfs:AUTO" ] && root="$BOOTFS"; SNAPNAME="$(getarg bootfs.snapshot)"; exec @sbindir@/zfs snapshot "$root@${SNAPNAME:-%v}"'
RemainAfterExit=yes RemainAfterExit=yes