add: notify when adding a file that would cause a case-folding collision On a case-sensitive file system, files can be added with names that differ only in case (a "case collision"). This would cause an error on case-insensitive filesystems. A warning or error is now given for such collisions, depending on the value of ui.portablefilenames ('warn', 'abort', or 'ignore'): $ touch file File $ hg add --config ui.portablefilenames=abort File abort: possible case-folding collision for File $ hg add File warning: possible case-folding collision for File

--- a/mercurial/scmutil.py	Sat Apr 30 11:08:24 2011 +0200
+++ b/mercurial/scmutil.py	Sat Apr 30 12:39:46 2011 +0200
@@ -22,6 +22,11 @@
         if msg:
             portabilityalert(ui, "%s: %r" % (msg, f))
 
+def checkcasecollision(ui, f, files):
+    if f.lower() in files and files[f.lower()] != f:
+        portabilityalert(ui, _('possible case-folding collision for %s') % f)
+    files[f.lower()] = f
+
 def checkportabilityalert(ui):
     '''check if the user's config requests nothing, a warning, or abort for
     non-portable filenames'''