# HG changeset patch
# User Thomas Arendsen Hein <thomas@intevation.de>
# Date 1165788233 -3600
# Node ID db36a4f490f685e3557d2315d4c8ee078af2749f
# Parent  8e907b86126bab93155eb2ed227d3ccc95a20300
Indicate the purpose of the dummy changelog file in itself.
Otherwise people getting an error message with an old installation might
wonder why this file is corrupted.

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -50,7 +50,10 @@ class localrepository(repo.repository):
                     reqfile.write("%s\n" % r)
                 reqfile.close()
                 # create an invalid changelog
-                self.opener("00changelog.i", "a").write('\0\0\0\2')
+                self.opener("00changelog.i", "a").write(
+                    '\0\0\0\2' # represents revlogv2
+                    ' dummy changelog to prevent using the old repo layout'
+                )
             else:
                 raise repo.RepoError(_("repository %s not found") % path)
         elif create: