--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/cacheutil.py	Wed Jan 17 17:46:49 2018 +0100
@@ -0,0 +1,21 @@
+# scmutil.py - Mercurial core utility functions
+#
+#  Copyright Matt Mackall <mpm@selenic.com> and other
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+from __future__ import absolute_import
+
+from . import repoview
+
+def cachetocopy(srcrepo):
+    """return the list of cache file valuable to copy during a clone"""
+    # In local clones we're copying all nodes, not just served
+    # ones. Therefore copy all branch caches over.
+    cachefiles = ['branch2']
+    cachefiles += ['branch2-%s' % f for f in repoview.filtertable]
+    cachefiles += ['rbc-names-v1', 'rbc-revs-v1']
+    cachefiles += ['tags2']
+    cachefiles += ['tags2-%s' % f for f in repoview.filtertable]
+    cachefiles += ['hgtagsfnodes1']
+    return cachefiles