[PATCH 4 of 6 DEFAULT] subrepo: add support for locking working directory data

[David M. Carr]

# HG changeset patch
# User David M. Carr  <david at carrclan.us>
# Date 1326511283 18000
# Node ID 97f8b28771e6ad077e58b6536d207e79516b61ac
# Parent  935cb6220e4757e98f74a8941d3859afa4fa3b6f
subrepo: add support for locking working directory data

In order for some commands (such as remove) to better support subrepos,
there needs to be a way to lock the working directory data.  This
change adds a mechanism to do so.  It is currently only supported by
hg subrepos.

diff -r 935cb6220e47 -r 97f8b28771e6 mercurial/subrepo.py
--- a/mercurial/subrepo.py	Fri Jan 13 21:33:14 2012 -0500
+++ b/mercurial/subrepo.py	Fri Jan 13 22:21:23 2012 -0500
@@ -360,6 +360,13 @@
         '''
         pass
 
+    def wlock(self, wait=True):
+        '''
+        Obtain the wlock for the subrepo, if applicable.  If not supported,
+        will return None.
+        '''
+        return None
+
     def forget(self, files):
         pass
 
@@ -561,6 +568,9 @@
         ctx = self._repo[None]
         return ctx.walk(match)
 
+    def wlock(self, wait=True):
+        return self._repo.wlock(wait)
+
     def forget(self, files):
         ctx = self._repo[None]
         ctx.forget(files)