Snapshot directory timestamps are constant, should be dynamic about btrfs-sxbackup HOT 8 CLOSED

btrfs subvolumes are not directories. it's the timestamp of the source subvolume (root folder) at the time the snapshot is taken. it's what btrfs does and it makes sense, too..

from btrfs-sxbackup.

Can you elaborate on the "static timestamp makes sense" logic for you? Looks like a logic disconnect to me. It is impossible to determine when the snapshot was created if you don't put a timestamp into the subvolume name. Not looking to push a change to sxbackup, but additional insight would help me talk about this with btrfs people.

from btrfs-sxbackup.

sure. it's basically like a mountpoint. as soon as a volume is mounted the timestamp you see (eg. via ls) will be the one of the mounted volume, not the directory's anylonger.
it's the same here. the timestamp you see is the one of the snapshot subvolume root directory. it's actually the same for all your snapshots as the root directory of your source subvolume didn't change between the backup runs. this behaviour is also not btrfs-sxbackup but *nix related. I added local time to btrfs-sxbackup info for a more convenient view at backup creation dates.

from btrfs-sxbackup.

you could actually simulate a "moving timestamp" by touching your source volume before running the backup eg.
touch / && btrfs-sxbackup run /

from btrfs-sxbackup.

[Edit out nonsense which was just an artifact caused by the fact I touch the subvol prior to snapshotting]

I had been toying with the idea of parsing the creation date out of btrfs subvolume show, but it's quite slow to invoke this on each snapshot individually. Perhaps we should ask for btrfs-progs to add a new switch which shows creation date in btrfs subvol list, there are switches to display nearly every other field displayed by btrfs subvol show...

FWIW I've had to mess with source subvols prior to snapshotting anyway, thanks to https://bugzilla.kernel.org/show_bug.cgi?id=95201

from btrfs-sxbackup.

can you check if this works for you?

from btrfs-sxbackup.

I can confirm, its working. Thank you.

from btrfs-sxbackup.

thanks for the heads up.

from btrfs-sxbackup.