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diff --git a/third_party/python/yamllint/yamllint/rules/octal_values.py b/third_party/python/yamllint/yamllint/rules/octal_values.py
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index 0000000000..f6e80cef56
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+++ b/third_party/python/yamllint/yamllint/rules/octal_values.py
@@ -0,0 +1,95 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2017 ScienJus
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Use this rule to prevent values with octal numbers. In YAML, numbers that
+start with ``0`` are interpreted as octal, but this is not always wanted.
+For instance ``010`` is the city code of Beijing, and should not be
+converted to ``8``.
+
+.. rubric:: Examples
+
+#. With ``octal-values: {forbid-implicit-octal: true}``
+
+   the following code snippets would **PASS**:
+   ::
+
+    user:
+      city-code: '010'
+
+   the following code snippets would **PASS**:
+   ::
+
+    user:
+      city-code: 010,021
+
+   the following code snippets would **FAIL**:
+   ::
+
+    user:
+      city-code: 010
+
+#. With ``octal-values: {forbid-explicit-octal: true}``
+
+   the following code snippets would **PASS**:
+   ::
+
+    user:
+      city-code: '0o10'
+
+   the following code snippets would **FAIL**:
+   ::
+
+    user:
+      city-code: 0o10
+"""
+
+import yaml
+
+from yamllint.linter import LintProblem
+
+
+ID = 'octal-values'
+TYPE = 'token'
+CONF = {'forbid-implicit-octal': bool,
+        'forbid-explicit-octal': bool}
+DEFAULT = {'forbid-implicit-octal': True,
+           'forbid-explicit-octal': True}
+
+
+def check(conf, token, prev, next, nextnext, context):
+    if prev and isinstance(prev, yaml.tokens.TagToken):
+        return
+
+    if conf['forbid-implicit-octal']:
+        if isinstance(token, yaml.tokens.ScalarToken):
+            if not token.style:
+                val = token.value
+                if val.isdigit() and len(val) > 1 and val[0] == '0':
+                    yield LintProblem(
+                        token.start_mark.line + 1, token.end_mark.column + 1,
+                        'forbidden implicit octal value "%s"' %
+                        token.value)
+
+    if conf['forbid-explicit-octal']:
+        if isinstance(token, yaml.tokens.ScalarToken):
+            if not token.style:
+                val = token.value
+                if len(val) > 2 and val[:2] == '0o' and val[2:].isdigit():
+                    yield LintProblem(
+                        token.start_mark.line + 1, token.end_mark.column + 1,
+                        'forbidden explicit octal value "%s"' %
+                        token.value)