[pbs-devel] [PATCH proxmox-backup 2/7] backup: only allow finished backups as base snapshot

[Stefan Reiter <s.reiter@proxmox.com>]

If the datastore holds broken backups for some reason, do not attempt to
base following snapshots on those. This would lead to an error on
/previous, leaving the client no choice but to upload all chunks, even
though there might be potential for incremental savings.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
---
 src/api2/backup.rs        | 2 +-
 src/backup/backup_info.rs | 8 ++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/api2/backup.rs b/src/api2/backup.rs
index ad13faa5..aafea8fa 100644
--- a/src/api2/backup.rs
+++ b/src/api2/backup.rs
@@ -97,7 +97,7 @@ async move {
         bail!("backup owner check failed ({} != {})", username, owner);
     }
 
-    let last_backup = BackupInfo::last_backup(&datastore.base_path(), &backup_group).unwrap_or(None);
+    let last_backup = BackupInfo::last_backup(&datastore.base_path(), &backup_group, true).unwrap_or(None);
     let backup_dir = BackupDir::new_with_group(backup_group.clone(), backup_time);
 
     if let Some(last) = &last_backup {
diff --git a/src/backup/backup_info.rs b/src/backup/backup_info.rs
index 37dc7aa1..ea917d3c 100644
--- a/src/backup/backup_info.rs
+++ b/src/backup/backup_info.rs
@@ -313,9 +313,13 @@ impl BackupInfo {
     }
 
     /// Finds the latest backup inside a backup group
-    pub fn last_backup(base_path: &Path, group: &BackupGroup) -> Result<Option<BackupInfo>, Error> {
+    pub fn last_backup(base_path: &Path, group: &BackupGroup, only_finished: bool)
+        -> Result<Option<BackupInfo>, Error>
+    {
         let backups = group.list_backups(base_path)?;
-        Ok(backups.into_iter().max_by_key(|item| item.backup_dir.backup_time()))
+        Ok(backups.into_iter()
+            .filter(|item| !only_finished || item.is_finished())
+            .max_by_key(|item| item.backup_dir.backup_time()))
     }
 
     pub fn sort_list(list: &mut Vec<BackupInfo>, ascendending: bool) {
-- 
2.20.1