Update channel list from project-config

Now that the governance resolution to allow teams to host meetings in
their channels [1] has merged and all defined channels have a meetbot[2]
get the valid channel list from infra's canonical source.

[1] I631e2597bf818c5e4b2f813da14764d2cb55d0ce
[2] I6a8a1cedd8a83e3e856e8df4aba4d0a584912eb0

Change-Id: I09e4fc07c486905a55ef06604b05493532175bf5

tools/check_channels.py

@@ -15,11 +15,25 @@
 from __future__ import print_function
 
 import argparse
+import requests
+import yaml
+
 from yaml2ical import meeting
 
-channels = set(['openstack-meeting', 'openstack-meeting-alt',
-                'openstack-meeting-3', 'openstack-meeting-4',
-                'openstack-meeting-5', 'openstack-meeting-cp'])
+ACCESSBOT_YAML_URL = ('http://git.openstack.org/cgit/'
+                      'openstack-infra/project-config/'
+                      'plain/accessbot/channels.yaml')
+
+
+# FIXME*tonyb): Extend this to ensure the channel has a meetbot.
+# Right now this is true as the meetbots are in the globals but it could
+# change.
+def get_channels():
+    req = requests.get(ACCESSBOT_YAML_URL)
+    if req.status_code != 200:
+        raise SystemError('Unable to retrieve accessbot config. Aborting!')
+    accessbot = yaml.safe_load(req.text)
+    return set([x['name'] for x in accessbot['channels']])
 
 
 def main():
@@ -39,6 +53,7 @@ fully functional MeetBot.
                         help="directory containing YAML to process")
 
     args = parser.parse_args()
+    channels = get_channels()
     meetings = meeting.load_meetings(args.yaml_dir)
     for m in meetings:
         for s in m.schedules:
@@ -49,5 +64,6 @@ fully functional MeetBot.
                                  (s.filefrom, s.irc,
                                   ', '.join(channels)))
 
+
 if __name__ == '__main__':
     main()