Script to print a list of the official oslo repos

Add a script to print a list of the official oslo repositories. This can
be used as the basis of other tools that do things to those
repositories.

Change-Id: Iee0b73591b0153961606294a44d8db064478f656

list_oslo_projects.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+
+#    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.
+
+"""Print a list of the oslo project repository names.
+"""
+
+from __future__ import print_function
+
+import os
+
+from oslo.config import cfg
+import yaml
+
+
+DEFAULT_CONFIG_FILES = [
+    './oslo.conf',
+    os.path.expanduser('~/.oslo.conf'),
+]
+
+
+def main():
+    conf = cfg.ConfigOpts()
+    conf.register_cli_opt(
+        cfg.StrOpt(
+            'repo_root',
+            default='.',
+            help='directory containing the git repositories',
+        )
+    )
+    # Look for a few configuration files, and load the ones we find.
+    default_config_files = [
+        f
+        for f in DEFAULT_CONFIG_FILES
+        if os.path.exists(f)
+    ]
+    conf(
+        project='oslo',
+        default_config_files=default_config_files,
+    )
+
+    # Find the governance repository.
+    gov_repo = os.path.expanduser(os.path.join(conf.repo_root,
+                                               'openstack/governance'))
+
+    # Parse the program file within the repository.
+    program_input = os.path.join(gov_repo, 'reference/programs.yaml')
+    with open(program_input, 'r') as f:
+        program = yaml.load(f.read())
+
+    # Print the list of repositories.
+    repos = [p['repo'] for p in program['Common Libraries']['projects']]
+    for r in sorted(repos):
+        print(r)
+
+
+if __name__ == '__main__':
+    import sys
+    sys.exit(main())