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I want to delegate non-root user to delete read-only subvolumes (snapshots).

What exactly capabilities/rights I need to grant, so that he can remove his own read-only snapshots?

I've already mounted the btrfs with -o user_subvol_rm_allowed so users can remove read/write snapshots.

I need it to augment otherwise brillant SnapBtr.py, so non-root users can operate it.

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A user can not delete readonly snapshots directly, but he can make them writeable first and then delete them. For this you need to use the btrfs property command:

btrfs property set -ts /path/to/snapshot ro false

If the user is the owner of the snapshot, this should make it writeable and therefore deletable.

  • That is cool. Thank you! Too bad, that the btrfs-tools v3.12 present on Ubuntu 14.04 does not include this command - but that is a different story. – Adam Ryczkowski Aug 13 '14 at 22:11
  • I also stumbled across this. TBH I think that's a plain btrfs bug. – Jürgen Strobel Feb 2 '16 at 11:10

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