--- a/hgext/convert/common.py	Fri Aug 03 21:05:01 2012 +0200
+++ b/hgext/convert/common.py	Fri Aug 03 21:37:33 2012 +0200
@@ -5,8 +5,7 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import base64, errno
-import os
+import base64, errno, subprocess, os
 import cPickle as pickle
 from mercurial import util
 from mercurial.i18n import _
@@ -260,7 +259,7 @@
     def postrun(self):
         pass
 
-    def _cmdline(self, cmd, closestdin, *args, **kwargs):
+    def _cmdline(self, cmd, *args, **kwargs):
         cmdline = [self.command, cmd] + list(args)
         for k, v in kwargs.iteritems():
             if len(k) == 1:
@@ -277,19 +276,22 @@
         cmdline = [util.shellquote(arg) for arg in cmdline]
         if not self.ui.debugflag:
             cmdline += ['2>', os.devnull]
-        if closestdin:
-            cmdline += ['<', os.devnull]
         cmdline = ' '.join(cmdline)
         return cmdline
 
     def _run(self, cmd, *args, **kwargs):
-        return self._dorun(util.popen, cmd, True, *args, **kwargs)
+        def popen(cmdline):
+            p = subprocess.Popen(cmdline, shell=True, bufsize=-1,
+                    close_fds=util.closefds,
+                    stdout=subprocess.PIPE)
+            return p
+        return self._dorun(popen, cmd, *args, **kwargs)
 
     def _run2(self, cmd, *args, **kwargs):
-        return self._dorun(util.popen2, cmd, False, *args, **kwargs)
+        return self._dorun(util.popen2, cmd, *args, **kwargs)
 
-    def _dorun(self, openfunc, cmd, closestdin, *args, **kwargs):
-        cmdline = self._cmdline(cmd, closestdin, *args, **kwargs)
+    def _dorun(self, openfunc, cmd,  *args, **kwargs):
+        cmdline = self._cmdline(cmd, *args, **kwargs)
         self.ui.debug('running: %s\n' % (cmdline,))
         self.prerun()
         try:
@@ -298,16 +300,17 @@
             self.postrun()
 
     def run(self, cmd, *args, **kwargs):
-        fp = self._run(cmd, *args, **kwargs)
-        output = fp.read()
+        p = self._run(cmd, *args, **kwargs)
+        output = p.communicate()[0]
         self.ui.debug(output)
-        return output, fp.close()
+        return output, p.returncode
 
     def runlines(self, cmd, *args, **kwargs):
-        fp = self._run(cmd, *args, **kwargs)
-        output = fp.readlines()
+        p = self._run(cmd, *args, **kwargs)
+        output = p.stdout.readlines()
+        p.wait()
         self.ui.debug(''.join(output))
-        return output, fp.close()
+        return output, p.returncode
 
     def checkexit(self, status, output=''):
         if status:

--- a/hgext/convert/darcs.py	Fri Aug 03 21:05:01 2012 +0200
+++ b/hgext/convert/darcs.py	Fri Aug 03 21:37:33 2012 +0200
@@ -104,9 +104,10 @@
         # possible, etree will still raise an exception if any
         # non-printable characters are in the XML changelog.
         parser = XMLParser(encoding='latin-1')
-        fp = self._run(cmd, **kwargs)
-        etree.parse(fp, parser=parser)
-        self.checkexit(fp.close())
+        p = self._run(cmd, **kwargs)
+        etree.parse(p.stdout, parser=parser)
+        p.wait()
+        self.checkexit(p.returncode)
         return etree.getroot()
 
     def format(self):