goes in the hooks dir, requires the hooks plugin on newer versions of gerrit

ref-update

#!/bin/bash
ref="$(awk -F'newrev' '{print $2}' <<< "$@" | xargs)"
log="$(git log --format=%s%b -n 1 "$ref")"

if grep -iq "JIRA:*[0-9]*" <<< "$log"
  then
    :
  else
    echo "Commit rejected, please provide a jira issue in the format JIRA: ISSUE_NUMBER in the commit message"
    exit 1
fi