resilient: do not compute the signature for same file several times

slapos/resilient/runner_utils.py

@@ -109,6 +109,7 @@ def writeSignatureFile(slappart_signature_method_dict, runner_working_path, sign
       continue
 
     # Find if special signature function should be applied
+    signature_process = None
     for special_slappart in special_slappart_list:
       backup_identity_script_path = os.path.join(
         runner_working_path,
@@ -121,7 +122,9 @@ def writeSignatureFile(slappart_signature_method_dict, runner_working_path, sign
           stdin=subprocess.PIPE,
           stdout=subprocess.PIPE,
         )
+        break
 
+    if signature_process:
       (output, error_output) = signature_process.communicate(
         '\0'.join([os.path.join(dirpath, filename) for filename in filename_list])
       )
@@ -129,8 +132,8 @@ def writeSignatureFile(slappart_signature_method_dict, runner_working_path, sign
       if signature_process.returncode != 0:
         print(
           "An issue occured when calculating the custom signature"
-            " with %s :\n%s" % (
-              backup_identity_script_path, error_output
+          " with %s :\n%s\n%s" % (
+            backup_identity_script_path, output, error_output
           )
         )
         sys.exit(1)