[PATCH 1 of 1] util.mktempcopy: eliminate pointless lstat / chmod calls on Windows

[Adrian Buehlmann]

# HG changeset patch
# User Adrian Buehlmann <adrian at cadifra.com>
# Date 1308558845 -7200
# Branch stable
# Node ID e2a259aa747155ded2b960fafc20809a0fbcd16d
# Parent  15faf0e66909286e9ca88f536a160db1d2fc6aac
util.mktempcopy: eliminate pointless lstat / chmod calls on Windows

The only file flag that os.chmod supports on Windows is the readonly flag,
which we definitely don't care to copy.

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -683,19 +683,20 @@
     d, fn = os.path.split(name)
     fd, temp = tempfile.mkstemp(prefix='.%s-' % fn, dir=d)
     os.close(fd)
-    # Temporary files are created with mode 0600, which is usually not
-    # what we want.  If the original file already exists, just copy
-    # its mode.  Otherwise, manually obey umask.
-    try:
-        st_mode = os.lstat(name).st_mode & 0777
-    except OSError, inst:
-        if inst.errno != errno.ENOENT:
-            raise
-        st_mode = createmode
-        if st_mode is None:
-            st_mode = ~umask
-        st_mode &= 0666
-    os.chmod(temp, st_mode)
+    if os.name != 'nt':
+        # Temporary files are created with mode 0600, which is usually not
+        # what we want.  If the original file already exists, just copy
+        # its mode.  Otherwise, manually obey umask.
+        try:
+            st_mode = os.lstat(name).st_mode & 0777
+        except OSError, inst:
+            if inst.errno != errno.ENOENT:
+                raise
+            st_mode = createmode
+            if st_mode is None:
+                st_mode = ~umask
+            st_mode &= 0666
+        os.chmod(temp, st_mode)
     if emptyok:
         return temp
     try: