prepare-commit-msg

#!/bin/sh
#
# Automatically adds branch name and branch description to every commit message.
#
NAME=$(git branch | grep '*' | sed 's/* //')
DESCRIPTION=$(git config branch."$NAME".description)
TEXT=$(cat "$1" | sed '/^#.*/d')

if [ -n "$TEXT" ]
then
    echo "[$NAME]"' '$(cat "$1" | sed '/^#.*/d') > "$1"
    if [ -n "$DESCRIPTION" ]
    then
       echo "" >> "$1"
       echo $DESCRIPTION >> "$1"
    fi
else
    echo "Aborting commit due to empty commit message."
    exit 1
fi

Remember to turn this file as executable. You can do this by running: chmod +x .git/hooks/prepare-commit-msg