1 files changed, 29 insertions, 0 deletions
diff --git a/zuul/lib/dependson.py b/zuul/lib/dependson.py
new file mode 100644
index 000000000..cd0f6efa3
--- /dev/null
+++ b/zuul/lib/dependson.py
@@ -0,0 +1,29 @@
+# Copyright 2018 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import re
+
+
+DEPENDS_ON_RE = re.compile(r"^Depends-On: (.*?)\s*$",
+                           re.MULTILINE | re.IGNORECASE)
+
+
+def find_dependency_headers(message):
+    # Search for Depends-On headers
+    dependencies = []
+    for match in DEPENDS_ON_RE.findall(message):
+        if match in dependencies:
+            continue
+        dependencies.append(match)
+    return dependencies