2018-01-01 19:04:05 +00:00
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permalink: "/{{ year }}/{{ month }}/{{ day }}/run-server-side-git-hook-when-there-are-no-updates"
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title: "Run server-side git hook when there are no updates"
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published_date: "2013-11-02 10:14:00 +0100"
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layout: post.liquid
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data:
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route: blog
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2013-11-02 09:14:33 +00:00
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---
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I make heavy use of of [hooks in git][git-hooks], especially post-receive, to
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do different kind of things (deploying the blog, running some scripts, updating
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some checked out repos).
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From time to time when I create new hooks they fail due to some weird reasons.
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It's hard to investigate because of the slightly different shell environment
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the hooks use. But once pushed post-receive hooks won't run again, so just
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changing the hook won't help.
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There is an easy solution: pre-receive.
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I came across this on [Stack Overflow][so] but I keep forgetting it, so here it is.
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Add a `pre-receive` file in the hooks directory, make it executable and for
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testing let it exit with a non-zero status:
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echo "exit 1" > repo.git/hooks/pre-receive
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chmod +x repo.git/hooks/pre-receive
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Now to execute that hook:
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git push origin master HEAD:non-existing-branch
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If the pre-receive hook exits with success (`exit 0`) the non-existing-branch
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will be created, just keep that in mind.
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Now you're free to throw whatever debug code you need into that `pre-receive`
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file and see the output locally.
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[git-hooks]: http://git-scm.com/book/en/Customizing-Git-Git-Hooks
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[so]: http://stackoverflow.com/questions/13401244/git-run-server-side-hook-when-there-are-no-updates
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