From: Christoph Duelli <duelli@melosgmbh.de>
Date: Tue, 11 Mar 2008 09:27:16 GMT
Subject: Re: Is a given file known to git?
Message-ID: <47D65074.4000505@melosgmbh.de>
In-Reply-To: <47D636FC.2060203@viscovery.net>

Johannes Sixt schrieb:
> Christoph Duelli schrieb:
>> Given a repository and a path p to a file in it:
>> Is it possible (how?) to detect (in a bash script) if the file pointed
>> to by p is "known" to git?
>> Something along the line:
>> if `git knows p?
>> then
>> ...
>> fi
> 
> For simplicity, I'll assume with "known to git" you mean whether the
> current branch's tip has some content at the given path. Then you could write:
> 
> 	if git rev-parse HEAD:"$p" >/dev/null 2>&1
> 	then
> 		# git knows about $p
> 	else
> 		# git does not know about $p
> 	fi
> 
> -- Hannes
Yes, thank you, Johannes and Shawn, this works.
(A bit slow, though: with this test enabled my script takes 77 secs; 
without it it takes 0.3 secs. The time is spent in 9000 calls to the 
above test (the rev-parse version). (ok, the fact that there is a Perl 
system call around it might take some time, too).)

[For the record:
Shawn's ls-files variant takes: 148 secs
Shawn's cat-file variant takes: 251 secs
Time taken by time; roughly half user, half system.
]

As this script won't run often, that not too big a deal.
Still I would have hoped for a quicker way.

Thanks
-- 
Christoph Duelli