release.sh

#!/bin/bash

set -euo pipefail

PROJECT="Pinery"
MAIN_BRANCH="master"

# validate arguments
usage_error() {
  echo "Error: bad arguments" >&2
  echo "Usage: ${0} <major|minor|patch>" >&2
  exit 1
}

if [ "$#" -ne 1 ]; then
  usage_error
fi

# validate prerequisites
if [[ ! $(command -v xmlstarlet) ]]; then
  echo "Error: xmlstarlet not found"
  exit 2
fi

# validate git state
if [[ ! $(git branch | grep "^\*" | cut -d ' ' -f2) = "${MAIN_BRANCH}" ]]; then
  echo "Error: Not on ${MAIN_BRANCH} branch" >&2
  exit 3
fi
git fetch
if (( $(git log HEAD..origin/${MAIN_BRANCH} --oneline | wc -l) > 0 )); then
  echo "Error: Branch is not up-to-date with remote origin" >&2
  exit 4
fi

CURRENT_VERSION=$(xmlstarlet sel -t -v /_:project/_:version pom.xml | sed -e s/-SNAPSHOT//g)

MAJOR=$(echo "$CURRENT_VERSION" | cut -d . -f 1 -)
MINOR=$(echo "$CURRENT_VERSION" | cut -d . -f 2 -)
PATCH=$(echo "$CURRENT_VERSION" | cut -d . -f 3 -)

case "${1}" in
major)
    MAJOR=$((MAJOR+1))
    MINOR=0
    PATCH=0
    ;;
minor)
    MINOR=$((MINOR+1))
    PATCH=0
    ;;
patch)
    # use patch version from snapshot version
    ;;
*)
    usage_error
    ;;
esac
RELEASE_TYPE=${1}
RELEASE_VERSION=${MAJOR}.${MINOR}.${PATCH}

prepare() {
  echo "Preparing ${RELEASE_TYPE} release ${RELEASE_VERSION}..."
  mvn versions:set -DnewVersion=${RELEASE_VERSION} -DgenerateBackupPoms=false && \
  git commit -a -m "${PROJECT} v${RELEASE_VERSION} release" && \
  git tag -a v${RELEASE_VERSION} -m "${PROJECT} v${RELEASE_VERSION} release" && \
  TAGGED=true && \
  mvn clean install && \
  mvn versions:set -DnextSnapshot=true -DgenerateBackupPoms=false && \
  git commit -a -m "prepared for next development iteration"
}

rollback_local() {
  # undoes all changes from prepare function
  git reset --hard origin/${MAIN_BRANCH}
  if [[ ${TAGGED} = true ]]; then
    git tag -d v${RELEASE_VERSION}
  fi
  echo "Release failed. Changes reset." >&2
  exit 5
}

push() {
  echo "Pushing release..."
  # print these commands as they are not automatically rolled back
  set -x
  git push origin ${MAIN_BRANCH} && \
  git push origin v${RELEASE_VERSION} && \
  git checkout tags/v${RELEASE_VERSION} && \
  mvn deploy && \
  git checkout ${MAIN_BRANCH} && \
  set +x
}

push_error() {
  set +x
  echo "An error occurred while pushing the release. The process should probably be completed manually."
  exit 6
}

prepare || rollback_local
push || push_error

echo "export $(echo ${PROJECT} | tr '[:lower:]' '[:upper:]')_VERSION=${RELEASE_VERSION}"