fastest way to check if dir is a workdir

Hi,

I'm writing a little php-git-wrapper and would like to have a function
which tells me, whether a given path is part of a git checkout or not.

What would be the fastest commandline to check, whether the current dir
is part of a checkout? It may be assumed that the repository is at the
standard position.

Thanks a lot,
-- 
Thomas Koch, Software Developer
http://www.koch.ro

Young Media Concepts GmbH
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On Tue, Aug 12, 2008 at 01:34:56PM +0200, Thomas Koch wrote:

I'm writing a little php-git-wrapper and would like to have a function
which tells me, whether a given path is part of a git checkout or not.

What would be the fastest commandline to check, whether the current dir
is part of a checkout? It may be assumed that the repository is at the
standard position.

How about "git rev-parse --is-inside-work-tree"?

-Peff