Deleting a user whose home is a btrfs subvolume left that subvolume behind. The role passed remove=true to the user
module, but userdel removes a home directory with rmdir, which refuses to delete a subvolume that still holds nested
subvolumes or is otherwise not empty. The home therefore survived the removal and blocked a later recreation of the
same user, because btrfs_subvolume then found the path already occupied.
The subvolume is now deleted explicitly by the same module that created it, which keeps the creation and the removal
symmetric. Snapshots are stored outside the subvolume, so a btrbk based backup keeps the data available even though
the home itself is gone.
The removal is skipped when the home directory no longer exists, since findmnt fails on a missing path.
Co-authored-by: Copilot <copilot@github.com>
volker.raschekandCopilot
5f757914be