# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 2015-04-28 20:49:19
# Node ID 5c35a604035284c8062d110a768343a7dcec7158
# Parent  9183cb6886efe83f6e34b716e7c865b71f252bd9

changegroup: document that 'source' parameter exists for extensions

The 'source' parameter passed to generatefiles() is unused by the
method itself, but Durham says it is used by an extension.

diff --git a/mercurial/changegroup.py b/mercurial/changegroup.py
--- a/mercurial/changegroup.py
+++ b/mercurial/changegroup.py
@@ -440,6 +440,7 @@ class cg1packer(object):
         if clnodes:
             repo.hook('outgoing', node=hex(clnodes[0]), source=source)
 
+    # The 'source' parameter is useful for extensions
     def generatefiles(self, changedfiles, linknodes, commonrevs, source):
         repo = self._repo
         progress = self._progress