rebase.sh

BASE_BRANCH="upgrade"
BRANCH=$1

show_help() {
  echo "./${0} BRANCH_NAME"
  exit 1
}

if ! [[ "$BRANCH" ]]; then
  show_help
fi

git checkout $BASE_BRANCH
git pull

if ! git checkout "${BRANCH}"; then
  echo "Branch '${BRANCH}' does not exist."
  show_help
fi

git pull
git rebase $BASE_BRANCH
git push -f
git checkout $BASE_BRANCH

# shellcheck disable=SC2063
git branch | grep "*"