publish

#!/bin/bash
set -euo pipefail

#################################################################################
# A script to tag and publish the docker container. When run, the image will be
# tagged with the supplied version, the current git SHA, and `latest`.
#
# These will then be pushed to DockerHub using the (encrypted) credentials from
# the environment
#
# Usage: $0 <version>
#################################################################################

REPO=pseudomuto/protoc-gen-twagger

_tag_image() {
  docker build -t "${1}" .
  docker tag "${1}" "${2}:${3}"
  docker tag "${1}" "${2}:latest"
}

_push_image() {
  # credentials are encrypted in travis.yml
  docker login -u "${DOCKER_HUB_USER}" -p "${DOCKER_HUB_PASSWORD}"
  docker push "${1}"
  docker push "${2}:${3}"
  docker push "${2}:latest"
}

main() {
  if [ "$#" -ne 1 ]; then
    echo "USAGE: $0 <version>"
    exit 1
  fi

  local sha="${TRAVIS_COMMIT:-}"
  if [ -z "${sha}" ]; then sha=$(git rev-parse HEAD); fi

  local version="${1}"
  local git_tag="${REPO}:${sha}"

  _tag_image "${git_tag}" "${REPO}" "${version}"

  if [ -n "${DOCKER_HUB_USER:-}" ]; then
    _push_image "${git_tag}" "${REPO}" "${version}"
  fi
}

main "$@"