fix(backups): robustness against stale locks: snapshot sizing

selfprivacy_api/backup/backuppers/restic_backupper.py

@@ -335,6 +335,7 @@ class ResticBackupper(AbstractBackupper):
         with subprocess.Popen(
             command,
             stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
             shell=False,
         ) as handle:
             output = handle.communicate()[0].decode("utf-8")
@@ -382,7 +383,10 @@ class ResticBackupper(AbstractBackupper):
         )
 
         with subprocess.Popen(
-            restore_command, stdout=subprocess.PIPE, shell=False
+            restore_command,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            shell=False,
         ) as handle:
 
             # for some reason restore does not support

tests/test_graphql/test_backup.py

@@ -791,6 +791,9 @@ def test_operations_while_locked(backups, dummy_service):
     # using lowlevel to make sure no caching interferes
     assert Backups.provider().backupper.is_initted() is True
 
+    Backups.provider().backupper.lock()
+    assert Backups.snapshot_restored_size(snap.id) > 0
+
     # check that no locks were left
     Backups.provider().backupper.lock()
     Backups.provider().backupper.unlock()