Re: Something like $Id$, $Revision$ or $Date$?

[Michal Nazarewicz <mina86@tlen.pl>]

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Jakub Narebski <jnareb@gmail.com> writes:

> The reason why git doesn't support keywords like $Revision$ or $Date$
> is performance: the $Revision$ and $Date$ are keywords related to
> _commit_ data, not blob data. 

In my case identifying content not commit would be even better.

> 1. You can try to use either hooks (post-commit, post-update I think)
>    or smudge / clean filters (via gitattributes) to do keyword
>    expansion. This hits performance, and you probably would have the
>    problems CVS ad with keyword expansion.

Earlier in the thread there was following code for a pre-commit hook
mentioned:

#v+
files=$(git diff-index --name-only --diff-filter=AM HEAD)
perl -pi -e 's/\$Id.*?\$/\$Id: '$(TZ=UTC date +%s)' \$/g' $files
git add $files
#v-

Now, this meats all my needs except that (i) it adds all the files that
were modified (ie. makes `git commit` work like `git commit -a`) and
(ii) it modifies files even if the commit was aborted.

So, it seems that, what I need is: (i) a pre-commit-post-message-hook
and (ii) a way to get a list of files that are being committed.

> 2. You can use `export-subst` gitattribute and make git-archive do
>    keyword expansion, which can include things like '$Format:%aD$'
>    for commit date (equivalent of $Date:$?).
>
> 3. You can run some local equivalent of GIT-VERSION-GEN script git
>    and Linux kernel uses, and make your build system (Makefile)
>    replace '@@VERSION@@' or '++VERSION++' keywords / placeholders
>    as part of compiling process.

That would work but the thing is I'd like to have visioning without the
need of creating releases or doing some other voodoo magic -- simply `scp
file remote:file` or attach to an email.

-- 
Best regards,                                         _     _
 .o. | Liege of Serenly Enlightened Majesty of      o' \,=./ `o
 ..o | Computer Science,  Michal "mina86" Nazarewicz   (o o)
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