diff -r 1708a0cad774 -r 8b252e826c68 mercurial/scmutil.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/scmutil.py	Tue Apr 19 12:42:53 2011 +0200
@@ -0,0 +1,27 @@
+# scmutil.py - Mercurial core utility functions
+#
+#  Copyright Matt Mackall <mpm@selenic.com>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+from i18n import _
+import util, error
+import os
+
+def checkportable(ui, f):
+    '''Check if filename f is portable and warn or abort depending on config'''
+    util.checkfilename(f)
+    val = ui.config('ui', 'portablefilenames', 'warn')
+    lval = val.lower()
+    abort = os.name == 'nt' or lval == 'abort'
+    bval = util.parsebool(val)
+    if abort or lval == 'warn' or bval:
+        msg = util.checkwinfilename(f)
+        if msg:
+            if abort:
+                raise util.Abort("%s: %r" % (msg, f))
+            ui.warn(_("warning: %s: %r\n") % (msg, f))
+    elif bval is None and lval != 'ignore':
+        raise error.ConfigError(
+            _("ui.portablefilenames value is invalid ('%s')") % val)