diff -r 12721a20ed30 -r 4c6f7f0dadab mercurial/scmposix.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/scmposix.py	Tue Feb 12 11:36:21 2013 -0600
@@ -0,0 +1,32 @@
+import sys, os
+import osutil
+
+def _rcfiles(path):
+    rcs = [os.path.join(path, 'hgrc')]
+    rcdir = os.path.join(path, 'hgrc.d')
+    try:
+        rcs.extend([os.path.join(rcdir, f)
+                    for f, kind in osutil.listdir(rcdir)
+                    if f.endswith(".rc")])
+    except OSError:
+        pass
+    return rcs
+
+def systemrcpath():
+    path = []
+    if sys.platform == 'plan9':
+        root = 'lib/mercurial'
+    else:
+        root = 'etc/mercurial'
+    # old mod_python does not set sys.argv
+    if len(getattr(sys, 'argv', [])) > 0:
+        p = os.path.dirname(os.path.dirname(sys.argv[0]))
+        path.extend(_rcfiles(os.path.join(p, root)))
+    path.extend(_rcfiles('/' + root))
+    return path
+
+def userrcpath():
+    if sys.platform == 'plan9':
+        return [os.environ['home'] + '/lib/hgrc']
+    else:
+        return [os.path.expanduser('~/.hgrc')]