[PATCH 2 of 3] dirstate: add getfstime() to get current time to filesystem resolution

[Matt Mackall]

On Tue, 2011-03-15 at 21:39 -0400, Greg Ward wrote:
> # HG changeset patch
> # User Greg Ward <greg at gerg.ca>
> # Date 1300238571 14400
> # Node ID a32697a387d0ff0b7327cb993b700c1eb0310326
> # Parent  c5fa123f60a63af19057e873106c532ee2c553fa
> dirstate: add getfstime() to get current time to filesystem resolution.
> 
> Based on code already in write(). Will be needed by
> localrepository.commit() to call dirstate.maybelookup().

And this tempfile is needed because we don't have a handy file around
that we're already writing to?

> diff --git a/mercurial/dirstate.py b/mercurial/dirstate.py
> --- a/mercurial/dirstate.py
> +++ b/mercurial/dirstate.py
> @@ -10,6 +10,7 @@
>  import util, ignore, osutil, parsers, encoding
>  import struct, os, stat, errno
>  import cStringIO
> +import tempfile
>  
>  _format = ">cllll"
>  propertycache = util.propertycache
> @@ -391,6 +392,15 @@
>          self._pl = (parent, nullid)
>          self._dirty = True
>  
> +    def getfstime(self, dir):
> +        '''Return the current time to filesystem resolution.'''
> +        (fd, fn) = tempfile.mkstemp(dir=dir)
> +        try:
> +            return int(os.fstat(fd).st_mtime)
> +        finally:
> +            os.close(fd)
> +            os.unlink(fn)
> +
>      def maybelookup(self, f, now):
>          '''Examine f to determine if it needs more work to determine its
>          true status, or whether it can be considered normal.  If more
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