Sorry to come up with an old thread, but I'm really interested if
something is going on with that idea. It would help in many situations
if you could "promote" snapshots to "regular" subvolumes.
Let's for example take btrfs-restore: It does not restore snapshots by
default, which is rather smart, because a snapshot should merely be a
somewhat older version of an existing subvolume. But let's assume in
some point in the past, you really messed up your /home and you used a
snapshot to recreate it, like deleting the dirty /home subvolume and
snapshotting the latest backup to a writeable /home again. Then,
whatever the reason be, you see yourself confronted with using the
btrfs-restore tool. Now per default you cannot restore /home, since it
is officially a snapshot, but on the other hand, you do not want to
restore all other snapshots together with /home (without fiddling with
some regular expression path filter, that is).
To truly achieve the desired outcome, instead of snapshotting a backup
to /home, you would have had to create a new subvolume /home and to
reflink-cp all the contents from the snapshot to the new /home. I find
this somehow irritating, given that snapshotting is almost instantly
while cp takes quite some time on a big enough /home.
So I hereby want to push this snapshot-promoting request and would be
interested in the developers' opinions!
--
Flo
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