[PATCH 04 of 13 STABLE V4] icasefs: consider as case sensitive if there is no counterevidence, for safety

[FUJIWARA Katsunori]

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1324037380 -32400
# Branch stable
# Node ID 4708d2c872d99a2881506755d76e20aa5f3474ad
# Parent  c5033e2ccf7653deae9995e0ab55e80f696bfa59
icasefs: consider as case sensitive if there is no counterevidence, for safety

for safety, this patch prevents case-less name from misleading into
case insensitivity, even though such names should not be used.

diff -r c5033e2ccf76 -r 4708d2c872d9 mercurial/util.py
--- a/mercurial/util.py	Fri Dec 16 21:09:40 2011 +0900
+++ b/mercurial/util.py	Fri Dec 16 21:09:40 2011 +0900
@@ -595,9 +595,12 @@
     """
     s1 = os.stat(path)
     d, b = os.path.split(path)
-    p2 = os.path.join(d, b.upper())
-    if path == p2:
-        p2 = os.path.join(d, b.lower())
+    b2 = b.upper()
+    if b == b2:
+        b2 = b.lower()
+        if b == b2:
+            return True # no evidence against case sensitivity
+    p2 = os.path.join(d, b2)
     try:
         s2 = os.stat(p2)
         if s2 == s1: