verify: log/warn on invalid owner

in order to trigger a notification/make the problem more visible than
just in syslog.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

src/api2/admin/datastore.rs

@@ -648,7 +648,7 @@ pub fn verify(
                 verify_all_backups(datastore, worker.clone(), worker.upid(), owner, None)?
             };
             if failed_dirs.len() > 0 {
-                worker.log("Failed to verify following snapshots:");
+                worker.log("Failed to verify following snapshots/groups:");
                 for dir in failed_dirs {
                     worker.log(format!("\t{}", dir));
                 }

src/backup/verify.rs

@@ -508,23 +508,31 @@ pub fn verify_all_backups(
     }
 
     let filter_by_owner = |group: &BackupGroup| {
-        if let Some(owner) = &owner {
+        match (datastore.get_owner(group), &owner) {
-            match datastore.get_owner(group) {
+            (Ok(ref group_owner), Some(owner)) => {
-                Ok(ref group_owner) => {
                 group_owner == owner
                     || (group_owner.is_token()
                         && !owner.is_token()
                         && group_owner.user() == owner.user())
             },
-                Err(err) => {
+            (Ok(_), None) => true,
+            (Err(err), Some(_)) => {
                 // intentionally not in task log
                 // the task user might not be allowed to see this group!
                 println!("Failed to get owner of group '{}' - {}", group, err);
                 false
             },
-            }
+            (Err(err), None) => {
-        } else {
+                // we don't filter by owner, but we want to log the error
+                task_log!(
+                    worker,
+                    "Failed to get owner of group '{} - {}",
+                    group,
+                    err,
+                );
+                errors.push(group.to_string());
                 true
+            },
         }
     };