entrypoint.sh

#!/bin/sh
set -x

cd "${GITHUB_WORKSPACE}" || exit

# Set up variables.
TAG="${INPUT_TAG:-${GITHUB_REF#refs/tags/}}" # v1.2.3
MINOR="${TAG%.*}"                            # v1.2
MAJOR="${MINOR%.*}"                          # v1
MAJOR_VERSION_TAG_ONLY=${INPUT_MAJOR_VERSION_TAG_ONLY:-}

if [ "${GITHUB_REF}" = "${TAG}" ]; then
  echo "This workflow is not triggered by tag push: GITHUB_REF=${GITHUB_REF}"
  exit 1
fi

MESSAGE="${INPUT_MESSAGE:-Release ${TAG}}"

# Set up Git.
git config user.name "${GITHUB_ACTOR}"
git config user.email "${GITHUB_ACTOR}@users.noreply.github.com"

# Update MAJOR/MINOR tag
git tag -fa "${MAJOR}" -m "${MESSAGE}"
[ "${MAJOR_VERSION_TAG_ONLY}" = "true" ] || git tag -fa "${MINOR}" -m "${MESSAGE}"

# Set up remote url for checkout@v1 action.
if [ -n "${INPUT_GITHUB_TOKEN}" ]; then
  git remote set-url origin "https://${GITHUB_ACTOR}:${INPUT_GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"
fi

# Push
[ "${MAJOR_VERSION_TAG_ONLY}" = "true" ] || git push --force origin "${MINOR}"
git push --force origin "${MAJOR}"