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Add bootfs.snapshot and bootfs.rollback kernel parameters

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Unlike other filesystems, snapshots and rollbacks of bootfs need to be
done from a rescue environment. This patch makes it possible to snap-
shot or rollback the bootfs simply by specifying bootfs.snapshot or
bootfs.rollback on the kernel command line. The operation will be
performed by dracut just before bootfs is mounted.

Reviewed-by: Antonio Russo <antonio.e.russo@gmail.com> 
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Gregory Bartholomew <gregory.lee.bartholomew@gmail.com>
Closes #10198
This commit is contained in:
gregory-lee-bartholomew
2020-05-29 23:16:08 -05:00
committed by GitHub
parent 3d93161b01
commit 9052e3d70b
6 changed files with 66 additions and 2 deletions
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contrib/dracut/90zfs/module-setup.sh.in
+6
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@@ -109,5 +109,11 @@ install() {
ln -s ../zfs-import.target "${initdir}/$systemdsystemunitdir/initrd.target.wants"/zfs-import.target
type mark_hostonly >/dev/null 2>&1 && mark_hostonly @systemdunitdir@/zfs-import.target
fi
for _service in zfs-snapshot-bootfs.service zfs-rollback-bootfs.service ; do
inst "${moddir}"/$_service "${systemdsystemunitdir}"/$_service
if ! [ -L "${initdir}/$systemdsystemunitdir/initrd.target.wants"/$_service ]; then
ln -s ../$_service "${initdir}/$systemdsystemunitdir/initrd.target.wants"/$_service
fi
done
fi
}