entrypoint

#!/bin/sh -eux

CONFIG_ERROR=78

((jq -r ".comment.body" "${GITHUB_EVENT_PATH}" | grep -E "/submodules") \
  && jq -r ".issue.pull_request.url" "${GITHUB_EVENT_PATH}" \
  ) || exit ${CONFIG_ERROR}

if [ "$(jq -r ".action" "${GITHUB_EVENT_PATH}")" != "created" ]; then
  echo "not a new comment"
  exit ${CONFIG_ERROR}
fi

REPO=$(jq -r ".repository.full_name" "${GITHUB_EVENT_PATH}")

cd "${GITHUB_WORKSPACE}"

PR=$(jq -r ".issue.number" "${GITHUB_EVENT_PATH}")

BASE_URI="https://api.github.com"
API_HEADER="Accept: application/vnd.github.v3+json"
AUTH_HEADER="Authorization: token ${GITHUB_TOKEN}"

PR_INFO=$(curl -X GET -s -H "${AUTH_HEADER}" -H "${API_HEADER}" \
  "${BASE_URI}/repos/${REPO}/pulls/${PR}")

REF=$(echo "${PR_INFO}" | jq -r .head.ref)

git config --global user.email "submodule@github.com"
git config --global user.name "GitHub Submodules Action"

git remote set-url origin https://x-access-token:${GITHUB_TOKEN}@github.com/${REPO}.git

git fetch --all -p
git checkout "${REF}"

git submodule init
git submodule update
git submodule foreach 'git fetch --all -p'
git submodule foreach 'git merge origin/master'
git add -v .
git commit -m "bumping submodules"
git push origin "${REF}"