src/backup/datastore.rs: impl last_backup helper

src/backup/datastore.rs

@@ -168,6 +168,16 @@ impl DataStore {
         }
     }
 
+    /// Finds the latest backup inside a backup group
+    pub fn last_backup(&self, backup_type: &str, backup_id: &str) -> Result<Option<BackupInfo>, Error> {
+        let group = BackupGroup::new(backup_type, backup_id);
+
+        let backups = group.list_backups(&self.base_path())?;
+
+        Ok(backups.into_iter().max_by_key(|item| item.backup_dir.backup_time()))
+     }
+
+
     pub fn list_images(&self) -> Result<Vec<PathBuf>, Error> {
         let base = self.base_path();