entrypoint.sh

#!/bin/sh -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
}

git_cmd() {
  if [[ "${DRY_RUN:-false}" == "true" ]]; then
    echo $@
  else
    eval $@
  fi
}

git_setup
git_cmd git remote add upstream ${INPUT_UPSTREAM}
git_cmd git fetch upstream ${INPUT_UPSTREAM_BRANCH}

last_sha=$(git_cmd git rev-list -1 upstream/${INPUT_UPSTREAM_BRANCH})
short_sha=${last_sha:0:10}
echo "Last commited SHA: ${last_sha}"

up_to_date=$(git_cmd git rev-list origin/${INPUT_BRANCH} | grep ${last_sha} | wc -l)
pr_branch="pull-upstream-${last_sha:0:10}"
edits="\`$short_sha\` ($(date +'%m %d %Y'))."

if [[ "${up_to_date}" -eq 0 ]]; then
  git_cmd git checkout -b "${pr_branch}" --track "origin/${INPUT_BRANCH}"
  git_cmd git merge --no-edit "upstream/${INPUT_UPSTREAM_BRANCH}" -m \"Merge remote-tracking branch 'gnu/master' into master\"
  sed -i -r "s/^(The last merged commit is).*/\1 $edits/" README.md
  git_cmd git add README.md
  git_cmd git commit --amend --no-edit
  git_cmd git push -u origin "${pr_branch}"
  git_cmd git remote remove upstream

  hub pr list
  pr_exists=$(git_cmd hub pr list | grep ${last_sha} | wc -l)

  if [[ "${pr_exists}" -gt 0 ]]; then
    echo "PR Already exists!!!"
    exit 0
  else
    git_cmd hub pull-request -b "${INPUT_BRANCH}" -h "${pr_branch}" -l "${INPUT_PR_LABELS}" -a "${GITHUB_ACTOR}" -m "\"Merge upstream: ${short_sha}\""
  fi
else
  echo "Branch up-to-date"
  exit 0
fi