Git hook that inserts the git branch name into the commit message, useful for ticket references

prepare-commit-msg.sh

#!/bin/bash

branchPath=$(git symbolic-ref -q HEAD) # refs/heads/branchName
branchName=${branchPath##*/}           # get text behind the last /

# check that this is not an amend by checking that the first line is empty
firstLine=$(head -n1 $1)
if [ -z "$firstLine"  ] ; then
	# insert template at the start of the commit message file
	sed -i "1s/^/$branchName \n/" $1
fi