Richard W.M. Jones 56da6b36d3 daemon: btrfs: Simplify snapshot code and fix invalid memory access ...

The existing code had a bug which you can demonstrate by doing:

  $ guestfish -N fs:btrfs:10G -m /dev/sda1 \
  btrfs-subvolume-create /sub :
  btrfs-subvolume-snapshot /sub /snap1 : \
  btrfs-subvolume-snapshot /sub /snap123 : \
  btrfs-subvolume-snapshot /sub /snap123456 : \
  btrfs-subvolume-show /sub
  ...
  libguestfs: error: appliance closed the connection unexpectedly.
  This usually means the libguestfs appliance crashed.

As the code for parsing the output and creating the comma-separated
list of snapshots was unncessarily complicated in the first place,
simplify it.  This also fixes the bug.

This also adds a regression test.

Thanks: Arye Yurkovsky
Link: https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/QV5VDHIH7WRUNAE54K6OEOKJMWL6M7EM/

2025-11-24 10:44:44 +00:00

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