Remove expected_return_value. Resolves #232

pre_commit/clientlib/validate_manifest.py

@@ -24,7 +24,6 @@ MANIFEST_JSON_SCHEMA = {
             'language': {'type': 'string'},
             'language_version': {'type': 'string', 'default': 'default'},
             'files': {'type': 'string'},
-            'expected_return_value': {'type': 'number', 'default': 0},
             'stages': {
                 'type': 'array',
                 'default': [],

pre_commit/commands/run.py

@@ -87,7 +87,7 @@ def _run_single_hook(hook, repo, args, write, skips=frozenset()):
 
     retcode, stdout, stderr = repo.run_hook(hook, filenames)
 
-    if retcode != hook['expected_return_value']:
+    if retcode:
         retcode = 1
         print_color = color.RED
         pass_fail = 'Failed'