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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.

Mercurial
=========

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for software developers.

Basic install:

 $ make            # see install targets
 $ make install    # do a system-wide install
 $ hg debuginstall # sanity-check setup
 $ hg              # see help

See http://mercurial.selenic.com/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.