entrypoint.sh

#!/bin/bash -l

git_setup() {
  cat <<- EOF > "$HOME"/.netrc
		machine github.com
		login $GITHUB_ACTOR
		password $GITHUB_TOKEN
		machine api.github.com
		login $GITHUB_ACTOR
		password $GITHUB_TOKEN
EOF
  chmod 600 "$HOME"/.netrc

  git config --global user.email "$GITBOT_EMAIL"
  git config --global user.name "$GITHUB_ACTOR"
  git config --global --add safe.directory /github/workspace
}

quote() { printf %s\\n "$1" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/'/" ; }

print_cmd() {
  for cmd in "$@"; do
    # If the quoted (%q) command contains a backslash, it means there
    # are characters needs to be escaped. In this case, we quote the string
    # with single quotes.
    if printf "%q" "$cmd" | grep -q "\\\\"; then
      printf "%s " "$(quote "$cmd")"
    else
      printf "%s " "$cmd"
    fi
  done
  printf "\n"
}

git_cmd() {
  # shellcheck disable=SC3010
  if [[ "${DRY_RUN:-false}" == "true" ]]; then
    echo "This is a dry run. We just output the command:"
    print_cmd "$@"
  else
    echo "This is NOT a dry run. We output and execute the command:"
    print_cmd "$@"
    "$@"
  fi
}

echo "work around permission issue"
git config --global --add safe.directory /github/workspace

echo "INPUT_PR_BRANCH:$INPUT_PR_BRANCH"
echo "GITHUB_SHA:$GITHUB_SHA"

PR_BRANCH="auto-$INPUT_PR_BRANCH-$GITHUB_SHA-$(date +%s)"
echo "PR_BRANCH:$PR_BRANCH"
MESSAGE=$(git log -1 "$GITHUB_SHA" | grep -c "AUTO")
echo "MESSAGE:$MESSAGE"

if [[ "$MESSAGE" -gt 0 ]]; then
  echo "Autocommit, NO ACTION"
  exit 0
fi

LAST_COMMIT=$(git log -1)
echo "LAST COMMIT:$LAST_COMMIT"

# fetch the commit in case of shallow clone
git_cmd git fetch origin "${GITHUB_SHA}" --depth=2

PR_TITLE=$(git log -1 --format="%s" "$GITHUB_SHA")
echo "PR_TITLE:$PR_TITLE"
echo "INPUT_PR_BODY:${INPUT_PR_BODY}"

# Add GITHUB_SHA to the PR/issue body
INPUT_PR_BODY=$(printf "%s\n\nThis PR/issue was created by cherry-pick action from commit %s.", "${INPUT_PR_BODY}", "${GITHUB_SHA}")

git_setup
git_cmd git remote update
git_cmd git fetch --all
git_cmd git checkout -b "${PR_BRANCH}" origin/"${INPUT_PR_BRANCH}"
git_cmd git cherry-pick "${GITHUB_SHA}"

# Check the exit code of `git cherry-pick`
# shellcheck disable=SC2181
if [ $? -eq 0 ]; then
  echo "git cherry-pick succeeded. We will create a pull request for it."
  git_cmd git push -u origin "${PR_BRANCH}"
  git_cmd hub pull-request -b "${INPUT_PR_BRANCH}" -h "${PR_BRANCH}" -l "${INPUT_PR_LABELS}" -a "${GITHUB_ACTOR}" -m "${PR_TITLE}" -m "${INPUT_PR_BODY}" -r "${GITHUB_ACTOR}"
else
  echo "git cherry-pick failed. We will create an issue for it."
  git_cmd hub issue create -m "cherry-pick ${PR_TITLE} to branch ${INPUT_PR_BRANCH}" -m "${INPUT_PR_BODY}" -a "${GITHUB_ACTOR}" -l "${INPUT_PR_LABELS}"
fi