'commit-msg' hook that pulls your Jira issue number from your branch name

commit-msg

#!/bin/sh

# Add git branch if relevant
parse_git_branch() {
  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}

# Extact tracker abbreviation and ticket number (e.g. DS-123)
parse_git_tracker_and_ticket() {
  parse_git_branch | grep -e '[A-Z]\+-[0-9]\+' -o
}

MESSAGE="$(cat $1)"
TICKET=`parse_git_tracker_and_ticket`

if [ -n "$TICKET" ]
then
   echo "New commit message: [$TICKET] $MESSAGE"
   echo "[$TICKET] $MESSAGE" > $1
fi

Just noticed when you --amend a commit, it adds the ticket number to the commit again. Even if you use --no-edit.

For this purpose the prepare-commit-msg hook should be used. 1. It allows editing of the ID if necessary. 2. Also avoids the problems with amend etc.