Index: trunk/scripts/git-migration/filter-subdirs
===================================================================
--- trunk/scripts/git-migration/filter-subdirs	(revision 1937)
+++ trunk/scripts/git-migration/filter-subdirs	(revision 1938)
@@ -19,5 +19,3 @@
     tree = t[2]
 
-subprocess.check_call(['git', 'commit-tree',
-                       tree] + sys.argv[2:],
-                      stdin=sys.stdin)
+os.execvp('git', ['git', 'commit-tree', tree] + sys.argv[2:])