Git hook which adds ticket number extracted from branch name (like TICKET-123_comment) to every commit message.

prepare-commit-msg

#!/bin/bash
#
# This hook adds ticket number from branch name to every commit message
#
 
BRANCH_NAME=$(git symbolic-ref --short HEAD)
MSG=$(head -n 1 $1)

[[ -z "$BRANCH_NAME" ]] && exit 0
if [ "$BRANCH_NAME" = "master" ]; then
	APPEND="[master] "
else
	TICKET=`echo "$BRANCH_NAME" | sed 's/\([A-Z]\+-[0-9]\+\|build\).*/\1/'`
	[ -z "$TICKET" -o "$TICKET" = "$BRANCH_NAME" ] && exit 0
	APPEND="[$TICKET] "
fi

[[ "${MSG:0:${#APPEND}}" == "$APPEND" ]] && exit 0

sed -i.bak -e "1s/^/${APPEND}/" $1