Bug 1272544 - artifact builds with git now only consider the last 500 revisions rather than all revisions for the last 500 commits. r=chmanchester

MozReview-Commit-ID: 21Y4S5t952d

--HG--
extra : rebase_source : c447adf697f9924d6738c15ccb8c0e170fed31d3

python/mozbuild/mozbuild/artifacts.py

@@ -824,11 +824,10 @@ class Artifacts(object):
         return candidate_pushheads
 
     def _get_hg_revisions_from_git(self):
-
-        # First commit is HEAD, next is HEAD~1, etc.
         rev_list = subprocess.check_output([
             self._git, 'rev-list', '--topo-order',
-            'HEAD~{num}..HEAD'.format(num=NUM_REVISIONS_TO_QUERY),
+            '--max-count={num}'.format(num=NUM_REVISIONS_TO_QUERY),
+            'HEAD',
         ])
 
         hg_hash_list = subprocess.check_output([