Git pre-receive hook to check GitVersion (http://gitversion.readthedocs.io/en/latest/) tags in merge message

pre-receive.sh

#!/bin/bash
#
# check commit messages for semantic versioning tags

REGEX="\\+semver:\\s?(breaking|major|feature|minor|fix|patch|none|skip)"
DEFAULT_BRANCH=$(git symbolic-ref HEAD)
ERROR_MSG="[POLICY] The commit message doesn't contains a semantic versioning tag"

while read OLDREV NEWREV REFNAME ; do
  if [[ "${REFNAME}" != "${DEFAULT_BRANCH:=refs/heads/master}" ]]; then
    exit 0
  else
    COMMIT_MESSAGE=`git log --format=%B -n 1 $NEWREV | cat -`
    if ! echo $COMMIT_MESSAGE | grep -iqE "$REGEX"; then
      echo "$ERROR_MSG: $COMMIT_MESSAGE" >&2
      exit 1
    fi
  fi
done
exit 0