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localrepo: decorate dirstate() with filecache

We refresh the stat info when releasing repo.wlock(), right after writing it.

Also, invalidate the dirstate by deleting its attribute. This will force a
stat by the decorator that actually checks if anything changed, rather than
reading it again every time.

Note that prior to this, there was a single dirstate instance created for a
localrepo. It was invalidated by calling dirstate.invalidated(), clearing
its internal attributes.

As a consequence, the following construct is no longer safe:

  ds = repo.dirstate # keep a reference to the repo's dirstate
  wlock = repo.wlock()
  try:
      ds.setparents(...)
  finally:
      wlock.release() # dirstate should be written here

Since it's possible that the dirstate was modified between lines #1 and #2,
therefore changes to the old dirstate won't get written when the lock releases,
because a new instance was created by the decorator.

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also http://mercurial.selenic.com/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide:
#import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)