Re: [PATCH 3/4] update-hook: parse the tag header in preparation to use the tag type

From: Andy Parkins <andyparkins@gmail.com>
Date: Mar 20, 2007, 15:24 UTC
Message-ID: <200703201524.04282.andyparkins@gmail.com>
In-Reply-To: <20070320143844.GA1750@spearce.org>

On Tuesday 2007 March 20 14:38, Shawn O. Pearce wrote:

> The problem of course is the update hook is running before a ref
> is created to point at the tag.  If you used post-receive hook
> on the other hand...  Oh, right, that has its own problems too!

I've obviously not described the problem very well; as I don't understand how your comment relates to this patch.

All I'm doing is pulling the individual fields out of

 $ git cat-file -p v1.5.0
 object 437b1b20df4b356c9342dac8d38849f24ef44f27
 type commit
 tag v1.5.0
 tagger Junio C Hamano <junkio@cox.net> Wed Feb 14 00:00:00 2007 +0000

And putting them in their own variables. I'm not sure how for-each-ref or in fact, any ref-based tool would help me do this. At this point it's nothing to do with git, it's a standard shell script problem.

 git cat-file -p $newrev | while read field value
 do
   variable = "found"
 done
 echo $variable

Doesn't work, because the right half of the pipe is run in its own process and so setting "variable" has no effect once the while loop is over.

I found that "<<<" heredoc thing in the bash manual, which is almost like having a reverse pipe and allows the while loop to run in the main process.

Andy

-- 
Dr Andy Parkins, M Eng (hons), MIET
andyparkins@gmail.com