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new post: Run server-side git hook when there are no updates

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Jan-Erik Rediger 2013-11-02 10:14:33 +01:00
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---
layout: post
title: Run server-side git hook when there are no updates
date: 02.11.2013 10:14
---
I make heavy use of of [hooks in git][git-hooks], especially post-receive, to
do different kind of things (deploying the blog, running some scripts, updating
some checked out repos).
From time to time when I create new hooks they fail due to some weird reasons.
It's hard to investigate because of the slightly different shell environment
the hooks use. But once pushed post-receive hooks won't run again, so just
changing the hook won't help.
There is an easy solution: pre-receive.
I came across this on [Stack Overflow][so] but I keep forgetting it, so here it is.
Add a `pre-receive` file in the hooks directory, make it executable and for
testing let it exit with a non-zero status:
echo "exit 1" > repo.git/hooks/pre-receive
chmod +x repo.git/hooks/pre-receive
Now to execute that hook:
git push origin master HEAD:non-existing-branch
If the pre-receive hook exits with success (`exit 0`) the non-existing-branch
will be created, just keep that in mind.
Now you're free to throw whatever debug code you need into that `pre-receive`
file and see the output locally.
[git-hooks]: http://git-scm.com/book/en/Customizing-Git-Git-Hooks
[so]: http://stackoverflow.com/questions/13401244/git-run-server-side-hook-when-there-are-no-updates