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- uses: actions/checkout@v2
  with:
    # Repository name with owner. For example, actions/checkout
    # Default: ${{ github.repository }}
    repository: ''

    # The branch, tag or SHA to checkout. When checking out the repository that
    # triggered a workflow, this defaults to the reference or SHA for that event.
    # Otherwise, uses the default branch.
    ref: ''

    # Personal access token (PAT) used to fetch the repository. The PAT is configured
    # with the local git config, which enables your scripts to run authenticated git
    # commands. The post-job step removes the PAT.
    #
    # We recommend using a service account with the least permissions necessary. Also
    # when generating a new PAT, select the least scopes necessary.
    #
    # [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)
    #
    # Default: ${{ github.token }}
    token: ''

    # SSH key used to fetch the repository. The SSH key is configured with the local
    # git config, which enables your scripts to run authenticated git commands. The
    # post-job step removes the SSH key.
    #
    # We recommend using a service account with the least permissions necessary.
    #
    # [Learn more about creating and using encrypted secrets](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-and-using-encrypted-secrets)
    ssh-key: ''

    # Known hosts in addition to the user and global host key database. The public SSH
    # keys for a host may be obtained using the utility `ssh-keyscan`. For example,
    # `ssh-keyscan github.com`. The public key for github.com is always implicitly
    # added.
    ssh-known-hosts: ''

    # Whether to perform strict host key checking. When true, adds the options
    # `StrictHostKeyChecking=yes` and `CheckHostIP=no` to the SSH command line. Use
    # the input `ssh-known-hosts` to configure additional hosts.
    # Default: true
    ssh-strict: ''

    # Whether to configure the token or SSH key with the local git config
    # Default: true
    persist-credentials: ''

    # Relative path under $GITHUB_WORKSPACE to place the repository
    path: ''

    # Whether to execute `git clean -ffdx && git reset --hard HEAD` before fetching
    # Default: true
    clean: ''

    # Number of commits to fetch. 0 indicates all history for all branches and tags.
    # Default: 1
    fetch-depth: ''

    # Whether to download Git-LFS files
    # Default: false
    lfs: ''

    # Whether to checkout submodules: `true` to checkout submodules or `recursive` to
    # recursively checkout submodules.
    #
    # When the `ssh-key` input is not provided, SSH URLs beginning with
    # `git@github.com:` are converted to HTTPS.
    #
    # Default: false
    submodules: ''

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- uses: actions/checkout@v2
  with:
    fetch-depth: 0

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- uses: actions/checkout@v2
  with:
    ref: my-branch

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- uses: actions/checkout@v2
  with:
    fetch-depth: 2
- run: git checkout HEAD^

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- name: Checkout
  uses: actions/checkout@v2
  with:
    path: main

- name: Checkout tools repo
  uses: actions/checkout@v2
  with:
    repository: my-org/my-tools
    path: my-tools

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- name: Checkout
  uses: actions/checkout@v2

- name: Checkout tools repo
  uses: actions/checkout@v2
  with:
    repository: my-org/my-tools
    path: my-tools

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- name: Checkout
  uses: actions/checkout@v2
  with:
    path: main

- name: Checkout private tools
  uses: actions/checkout@v2
  with:
    repository: my-org/my-private-tools
    token: ${{ secrets.GitHub_PAT }} # `GitHub_PAT` is a secret that contains your PAT
    path: my-tools

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- uses: actions/checkout@v2
  with:
    ref: ${{ github.event.pull_request.head.sha }}

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on:
  pull_request:
    branches: [master]
    types: [opened, synchronize, closed]
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2