[pbs-devel] [PATCH proxmox-backup 2/2] fix #6358: remove group note file if present on group destroy

[Christian Ebner]

Removing the group directory when forgetting a backup group or
removing the final backup snapshot of a group did not take into
consideration a potentially present group note file, leading for it
to fail.

Further, since the owner file is removed before trying to remove the
(not empty) group directory, the group will not be usable anymore as
the owner check will fail as well.

To fix this, remove the backup group's note file first, if present
and only after that try to cleanup the rest.

Fixes: https://bugzilla.proxmox.com/show_bug.cgi?id=6358
Signed-off-by: Christian Ebner <c.ebner at proxmox.com>
---
 pbs-datastore/src/backup_info.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pbs-datastore/src/backup_info.rs b/pbs-datastore/src/backup_info.rs
index d4732fdd9..22b4eddf3 100644
--- a/pbs-datastore/src/backup_info.rs
+++ b/pbs-datastore/src/backup_info.rs
@@ -244,6 +244,13 @@ impl BackupGroup {
 
     /// Helper function, assumes that no more snapshots are present in the group.
     fn remove_group_dir(&self) -> Result<(), Error> {
+        let note_path = self.store.group_notes_path(&self.ns, &self.group);
+        if let Err(err) = std::fs::remove_file(&note_path) {
+            if err.kind() != std::io::ErrorKind::NotFound {
+                bail!("removing the note file '{note_path:?}' failed - {err}")
+            }
+        }
+
         let owner_path = self.store.owner_path(&self.ns, &self.group);
 
         std::fs::remove_file(&owner_path).map_err(|err| {
-- 
2.39.5