Writing a git post-receive hook to deal with a specific branch

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A post-receive hook gets its arguments from stdin, in the form:

<oldrev> <newrev> <refname>

Since these arguments are coming from stdin, not from a command line argument, you need to use read instead of $1 $2 $3.

The post-receive hook can receive multiple branches at once (for example if someone does a git push --all), so we also need to wrap the read in a while loop.

A working snippet looks something like this:

#!/bin/bash
while read oldrev newrev refname
do
    branch=$(git rev-parse --symbolic --abbrev-ref $refname)
    if [ "master" = "$branch" ]; then
        # Do something
    fi
done

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