Re: Syntax check via update hook?

From: Mark Plaksin <happy@usg.edu>
Date: May 12, 2009, 19:16 UTC
Message-ID: <wsd4aem8rh.fsf@usg.edu>
In-Reply-To: <20090509144711.GA3926@sigill.intra.peff.net>

Jeff King <peff@peff.net> writes:

> That sounds like a reasonable goal. In the hook itself, you can do one
> of:

Show 17 quoted lines

>   2. Check out the whole tree to a temp directory and run your full
>      syntax check there. The simplest way would be by using "git
>      archive" to generate the tree. You can make this a bit more
>      efficient by keeping the temp directory between runs and using
>      git to just update the changed files. Off the top of my head, that
>      would look something like:
>
>         $ cat <<EOF >.git/hooks/update
>         #!/bin/sh
>         GIT_INDEX_FILE=/path/to/tempdir/index; export GIT_INDEX_FILE
>         cd /path/to/tempdir/tree &&
>         mkdir -p tree &&
>         git read-tree "$3" &&
>         git checkout-index &&
>         your_syntax_check
>         EOF
>         $ chmod +x .git/hooks/update

Thanks for helping! :)

Unfortunately we don't quite get it. Can you flesh out your example a bit and explain the concepts involved? We're relative git newbies. We tried reading the man pages to the commands you use to no avail. One big stumbling block seems to be how we create/set-up tempdir. Is that supposed to be a pre-created git checkout, or created via git-archive, or .. ?

Also, we actually just want to check the syntax of the files that were changed in the commit, not the whole tree. Will your method give us access to the path names of the files that changed?

Thanks again!