[Bug 1172273] snapper rollback considered harmful

http://bugzilla.suse.com/show_bug.cgi?id=1172273 http://bugzilla.suse.com/show_bug.cgi?id=1172273#c5 --- Comment #5 from Fabian Vogt --- (In reply to Thorsten Kukuk from comment #4)

As Ignaz wrote: we can assume that a system is using transactional-updates, if the root filesystem is read-only.

So, if the root filesystem is read-only and snapper rollback is called,

This also matches the case when booting into a read-only snapshot on plain TW, so it would need some additional criteria.

map the given snapshot number or the current snapshot number to a btrfs ID and make it the new default: btrfs subvolume set-default $BTRFS_ID /.snapshots

afterwards, remove any cleaning algorithm from that snapshot: snapper ${SNAPPER_NO_DBUS} modify -c '' ${ROLLBACK_SNAPSHOT}

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