Update cq_client and add validate command to commit_queue binary

third_party/cq_client/validate_config.py

Index: third_party/cq_client/validate_config.py
diff --git a/third_party/cq_client/validate_config.py b/third_party/cq_client/validate_config.py
new file mode 100644
index 0000000000000000000000000000000000000000..1e34b868e1172e0222856d9a8a79a09397c1460a
--- /dev/null
+++ b/third_party/cq_client/validate_config.py
@@ -0,0 +1,112 @@
+#!/usr/bin/env python
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""CQ config validation library."""
+
+import argparse
+# The 'from google import protobuf' below was replaced to fix an issue where
+# some users may have built-in google package installed on their system, which
+# is incompatible with cq_pb2 below. This hack can be removed after
+# http://crbug.com/503067 is resolved.
+import protobuf26 as protobuf
+import logging
+import re
+import sys
+
+from cq_client import cq_pb2
+
+
+REQUIRED_FIELDS = [
+  'version',
+  'rietveld',
+  'rietveld.url',
+  'verifiers',
+  'cq_name',
+]
+
+LEGACY_FIELDS = [
+  'svn_repo_url',
+  'server_hooks_missing',
+  'verifiers_with_patch',
+]
+
+EMAIL_REGEXP = '^[^@]+@[^@]+\.[^@]+$'
+
+
+def _HasField(message, field_path):
+  """Checks that at least one field with given path exist in the proto message.
+
+  This function correctly handles repeated fields and will make sure that each
+  repeated field will have required sub-path, e.g. if 'abc' is a repeated field
+  and field_path is 'abc.def', then the function will only return True when each
+  entry for 'abc' will contain at least one value for 'def'.
+
+  Args:
+    message (google.protobuf.message.Message): Protocol Buffer message to check.
+    field_path (string): Path to the target field separated with ".".
+
+  Return:
+    True if at least one such field is explicitly set in the message.
+  """
+  path_parts = field_path.split('.', 1)
+  field_name = path_parts[0]
+  sub_path = path_parts[1] if len(path_parts) == 2 else None
+
+  field_labels = {fd.name: fd.label for fd in message.DESCRIPTOR.fields}
+  repeated_field = (field_labels[field_name] ==
+                    protobuf.descriptor.FieldDescriptor.LABEL_REPEATED)
+
+  if sub_path:
+    field = getattr(message, field_name)
+    if repeated_field:
+      if not field:
+        return False
+      return all(_HasField(entry, sub_path) for entry in field)
+    else:
+      return _HasField(field, sub_path)
+  else:
+    if repeated_field:
+      return len(getattr(message, field_name)) > 0
+    else:
+      return message.HasField(field_name)
+
+
+def IsValid(cq_config):
+  """Validates a CQ config and prints errors/warnings to the screen.
+
+  Args:
+    cq_config (string): Unparsed text format of the CQ config proto.
+
+  Returns:
+    True if the config is valid.
+  """
+  try:
+    config = cq_pb2.Config()
+    protobuf.text_format.Merge(cq_config, config)
+  except protobuf.text_format.ParseError as e:
+    logging.error('Failed to parse config as protobuf:\n%s', e)
+    return False
+
+  for fname in REQUIRED_FIELDS:
+    if not _HasField(config, fname):
+      logging.error('%s is a required field', fname)
+      return False
+
+  for fname in LEGACY_FIELDS:
+    if _HasField(config, fname):
+      logging.warn('%s is a legacy field', fname)
+
+
+  for base in config.rietveld.project_bases:
+    try:
+      re.compile(base)
+    except re.error:
+      logging.error('failed to parse "%s" in project_bases as a regexp', base)
+      return False
+
+  # TODO(sergiyb): For each field, check valid values depending on its
+  # semantics, e.g. email addresses, regular expressions etc.
+
+  return True