[PATCH] Enables lock work under the other 'OS'

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[PATCH] Enables lock work under the other 'OS'
From: K Thananchayan <[e-mail]>

os.symlink is not supported under Windows. This patch
introduces util.mklockf, util.getlowner that use
regular files under Winodws but symlink under unix.

tweaked by mpm:
 - changed function names
 - fixed to work on UNIX

manifest hash: 6f650a78a3b203dcad2f861582500b6b4036599a
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mercurial/lock.py

@@ -6,6 +6,7 b''
 # of the GNU General Public License, incorporated herein by reference.
 
 import os, time
+import util
 
 class LockHeld(Exception):
     pass
@@ -34,10 +35,10 b' class lock:'
     def trylock(self):
         pid = os.getpid()
         try:
-            os.symlink(str(pid), self.f)
+            util.makelock(str(pid), self.f)
             self.held = 1
         except:
-            raise LockHeld(os.readlink(self.f))
+            raise LockHeld(util.readlock(self.f))
 
     def release(self):
         if self.held:

mercurial/util.py

@@ -18,7 +18,22 b' def rename(src, dst):'
 if os.name == 'nt':
     def pconvert(path):
         return path.replace("\\", "/")
+
+    def makelock(info, pathname):
+        ld = os.open(pathname, os.O_CREAT | os.O_WRONLY | os.O_EXCL)
+        os.write(ld, info)
+        os.close(ld)
+
+    def readlock(pathname):
+        return file(pathname).read()
 else:
     def pconvert(path):
         return path
 
+    def makelock(info, pathname):
+        os.symlink(info, pathname)
+
+    def readlock(pathname):
+        return os.readlink(pathname)
+
+