[Bug 1871246] [NEW] Revert to snapshot with child subvolumes

[Dark Dragon]

Public bug reported:

When using child subvolumes (e.g. /var/lib/docker/btrfs,
/var/snap/lxd/common/lxd/storage-pools/default), restoring a snapshot
involves moving these child subvolumes manually.

I suggest to add a command "btrfs subvolume restore SRC DST" with an option "--include-children" with the following behavior:
1. In case DST already exists, it could be moved to DST.bak
2. btrfs subvolume snapshot SRC DST
3. For all children of DST.bak, move to SRC

** Affects: btrfs-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1871246

Title:
  Revert to snapshot with child subvolumes

Status in btrfs-tools package in Ubuntu:
  New

Bug description:
  When using child subvolumes (e.g. /var/lib/docker/btrfs,
  /var/snap/lxd/common/lxd/storage-pools/default), restoring a snapshot
  involves moving these child subvolumes manually.

  I suggest to add a command "btrfs subvolume restore SRC DST" with an option "--include-children" with the following behavior:
  1. In case DST already exists, it could be moved to DST.bak
  2. btrfs subvolume snapshot SRC DST
  3. For all children of DST.bak, move to SRC

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