diff -r 6d43b39fbaa0 -r 03ff17a4bf53 hgext/infinitepush/common.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext/infinitepush/common.py	Fri Feb 09 13:39:15 2018 +0530
@@ -0,0 +1,58 @@
+# Copyright 2017 Facebook, Inc.
+#
+# 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
+
+import json
+import os
+import struct
+import tempfile
+
+from mercurial.node import hex
+
+from mercurial import (
+    error,
+    extensions,
+)
+
+def isremotebooksenabled(ui):
+    return ('remotenames' in extensions._extensions and
+            ui.configbool('remotenames', 'bookmarks'))
+
+def encodebookmarks(bookmarks):
+    encoded = {}
+    for bookmark, node in bookmarks.iteritems():
+        encoded[bookmark] = node
+    dumped = json.dumps(encoded)
+    result = struct.pack('>i', len(dumped)) + dumped
+    return result
+
+def downloadbundle(repo, unknownbinhead):
+    index = repo.bundlestore.index
+    store = repo.bundlestore.store
+    bundleid = index.getbundle(hex(unknownbinhead))
+    if bundleid is None:
+        raise error.Abort('%s head is not known' % hex(unknownbinhead))
+    bundleraw = store.read(bundleid)
+    return _makebundlefromraw(bundleraw)
+
+def _makebundlefromraw(data):
+    fp = None
+    fd, bundlefile = tempfile.mkstemp()
+    try:  # guards bundlefile
+        try:  # guards fp
+            fp = os.fdopen(fd, 'wb')
+            fp.write(data)
+        finally:
+            fp.close()
+    except Exception:
+        try:
+            os.unlink(bundlefile)
+        except Exception:
+            # we would rather see the original exception
+            pass
+        raise
+
+    return bundlefile