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#!/usr/bin/env bash
#  Copyright 2023 Red Hat
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#      https://www.apache.org/licenses/LICENSE-2.0
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
# -------------------------------------------------------
# Undoes a failed release:
#   - deletes a local and remote tag
#   - bump to previous version
#   - commit & push changes
# -------------------------------------------------------
set -Eeuo pipefail
trap cleanup SIGINT SIGTERM ERR EXIT
VERSION=0.0.1
# Change into the script's directory
# Using relative paths is safe!
script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)
readonly script_dir
cd "${script_dir}"
  cat <<EOF
    $(basename "${BASH_SOURCE[0]}") [FLAGS] <release-version>
    -h, --help          Prints help information
    -v, --version       Prints version information
    --no-color          Uses plain text output
    <release-version>   The release version to undo (as semver)
cleanup() {
  trap - SIGINT SIGTERM ERR EXIT
setup_colors() {
  if [[ -t 2 ]] && [[ -z "${NO_COLOR-}" ]] && [[ "${TERM-}" != "dumb" ]]; then
    NOFORMAT='\033[0m' RED='\033[0;31m' GREEN='\033[0;32m' ORANGE='\033[0;33m' BLUE='\033[0;34m' PURPLE='\033[0;35m' CYAN='\033[0;36m' YELLOW='\033[1;33m'
    # shellcheck disable=SC2034
    NOFORMAT='' RED='' GREEN='' ORANGE='' BLUE='' PURPLE='' CYAN='' YELLOW=''
  echo >&2 -e "${1-}"
  local msg=$1
  local code=${2-1} # default exit status 1
  msg "$msg"
  exit "$code"
version() {
  msg "${BASH_SOURCE[0]} $VERSION"
parse_params() {
  while :; do
    case "${1-}" in
    -h | --help) usage ;;
    -v | --version) version ;;
    --no-color) NO_COLOR=1 ;;
    -?*) die "Unknown option: $1" ;;
    *) break ;;
  ARGS=("$@")
  [[ ${#ARGS[@]} -eq 1 ]] || die "Missing release version"
  RELEASE_VERSION=${ARGS[0]}
is_semver() {
    local version
    version="$1"
    if [[ ! ${version} =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
        return 1
parse_params "$@"
setup_colors
SNAPSHOT_VERSION="${RELEASE_VERSION}-SNAPSHOT"
TAG="v${RELEASE_VERSION}"
is_semver "${RELEASE_VERSION}" || die "Release version is not a semantic version"
git diff-index --quiet HEAD || die "You have uncommitted changes"
[[ $(git tag -l "${TAG}") ]] || die "Tag ${TAG} not found"
msg "Codebase is ready to undo release ${CYAN}${RELEASE_VERSION}${NOFORMAT}"
msg "If you decide to continue, this script will "
msg "   1. Delete the tag ${CYAN}${TAG}${NOFORMAT} (local and remote)"
msg "   2. Bump the version to ${CYAN}${SNAPSHOT_VERSION}${NOFORMAT}"
msg "   3. ${CYAN}Commit${NOFORMAT} and ${CYAN}push${NOFORMAT} to origin"
echo "Do you wish to continue?"
select yn in "Yes" "No"; do
    case $yn in
        Yes ) break;;
        No ) die "Aborted ";;
msg "Delete tag"
git tag -d ${TAG}
git push --quiet --delete origin ${TAG}
./versionBump.sh ${SNAPSHOT_VERSION}
msg "Push changes"
git commit --quiet -am "Undo release ${TAG}"
git push --quiet origin main &> /dev/null
msg "Done. Please update/undo the changes to the changelog!"

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