Extract torrent trackers into a settings variable

This allows them to be overridden and changed in a central location,
like we do with the SVN URL, PXE boot URL, etc.

Signed-off-by: Dan McGee <dan@archlinux.org>

releng/models.py

@@ -5,6 +5,7 @@
 import markdown
 from pytz import utc
 
+from django.conf import settings
 from django.core.urlresolvers import reverse
 from django.db import models
 from django.db.models.signals import pre_save
@@ -146,9 +147,9 @@ def iso_url(self):
     def magnet_uri(self):
         query = [
             ('dn', "archlinux-%s-dual.iso" % self.version),
-            ('tr', "udp://tracker.archlinux.org:6969"),
-            ('tr', "http://tracker.archlinux.org:6969/announce"),
         ]
+        if settings.TORRENT_TRACKERS:
+            query.extend(('tr', uri) for uri in settings.TORRENT_TRACKERS)
         if self.torrent_infohash:
             query.insert(0, ('xt', "urn:btih:%s" % self.torrent_infohash))
         return "magnet:?%s" % '&'.join(['%s=%s' % (k, v) for k, v in query])

settings.py

@@ -164,6 +164,12 @@
 # community bit on the end, repo.svn_root is appended)
 SVN_BASE_URL = 'svn://svn.archlinux.org/'
 
+# Trackers used for ISO download magnet links
+TORRENT_TRACKERS = (
+    'udp://tracker.archlinux.org:6969',
+    'http://tracker.archlinux.org:6969/announce',
+)
+
 ## Import local settings
 from local_settings import *