util: do not recurse in makedirs if name is '' (issue2528)

mercurial/util.py

@@ -841,7 +841,7 b' def makedirs(name, mode=None):'
     except OSError, err:
         if err.errno == errno.EEXIST:
             return
-        if err.errno != errno.ENOENT:
+        if not name or err.errno != errno.ENOENT:
             raise
     parent = os.path.abspath(os.path.dirname(name))
     makedirs(parent, mode)

tests/test-bundle.t

@@ -399,6 +399,13 b' Direct clone from bundle (all-history)'
   
   $ rm -r full-clone
 
+When cloning from a non-copiable repository into '', do not
+recurse infinitely (issue 2528)
+
+  $ hg clone full.hg ''
+  abort: No such file or directory
+  [255]
+
 test for http://mercurial.selenic.com/bts/issue216
 
 Unbundle incremental bundles into fresh empty in one go