Fedora provides yum-fs-snapshot. If installed, on each package
installation or update a snapshot of all btrfs filesystems is taken, so
it is possible to revert the installation/update.
Suppose an update failed and I want to get back: with
# btrfs subvolume set-default yum-snapshot-whatever /
I define which snapshot to use at the next boot.
After rebooting I decide I really want to stay with this snapshot. I can
delete all other snapshots, but can I also delete my previous main
volume, thus defining the current default snapshot as my new base. (If
not, a growing part of the filesystem is wasted for old data I don't
need anymore.)
Any insight is appreciated!
Michael Kofler
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