action.yml

name: 'Checkout'
description: 'Checks out correct branch or pull request merge'
branding:
  icon: 'download'
  color: 'blue'
runs:
  using: 'composite'
  steps:
    - shell: bash
      run: |
        retry() {
          for i in {1..10}; do
              if "$@"; then
                  return 0
              else
                  sleep "${i}"
              fi
          done
          "$@"
        }

        wd=$(pwd)

        git version
        git config --global --add safe.directory "${wd}"
        git config --global advice.detachedHead false

        git init -b _initial_branch

        git remote add origin "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"

        git config --local gc.auto 0

        if [[ "${GITHUB_REF}" == "refs/heads/"* ]]; then
          branch="${GITHUB_REF#refs/heads/}"
          remote_ref="refs/remotes/origin/${branch}"
          retry git fetch --no-tags --prune --no-recurse-submodules --depth=1 origin "+${GITHUB_SHA}:${remote_ref}"
          retry git checkout --force -B "${branch}" "${remote_ref}"
        else
          retry git fetch --no-tags --prune --no-recurse-submodules --depth=1 origin "+${GITHUB_SHA}:${GITHUB_REF}"
          retry git checkout --force "${GITHUB_REF}"
        fi