checkout/README.md

# LNRSCheckout V2 (forked off of @actions/checkout@v2)

In the examples below, use ***LexisNexis-GHA-Public/LNRSCheckout@v2.3.4.1*** instead.  

This action checks-out your repository under `$GITHUB_WORKSPACE`, so your workflow can access it.

Only a single commit is fetched by default, for the ref/SHA that triggered the workflow. Set `fetch-depth: 0` to fetch all history for all branches and tags. Refer [here](https://help.github.com/en/articles/events-that-trigger-workflows) to learn which commit `$GITHUB_SHA` points to for different events.

The auth token is persisted in the local git config. This enables your scripts to run authenticated git commands. The token is removed during post-job cleanup. Set `persist-credentials: false` to opt-out.

When Git 2.18 or higher is not in your PATH, falls back to the REST API to download the files.

## A note about your `$GITHUB_WORKSPACE`  
On windows runner's this path is the working directory of your github runner + repo name x2.  The issue is that long repo names may result in exceeding the windows file name length restrictions, expecially if you count adding npm installers and other package management systems.  The naming format is the same for linux/macOS runners, however they do not have the same limitations Windows has.  

    d:\gh\01\_work\very-long-repo-name\very-long-repo-name\

This particular codebase has been modified to allow the `path` parameter to use parent folder structure.

    path: '..\..\repo-workingdir'
    allow_parent_path: true

Results in a working directory:

    d:\gh\01\_work\repo-workingdir

In the end this is better than what we had before.  However the original working directory will still be required.  Also note it's possible this can be dangerous so be careful using this feature.

# What's new

- Improved performance
  - Fetches only a single commit by default
- Script authenticated git commands
  - Auth token persisted in the local git config
- Supports SSH
- Creates a local branch
  - No longer detached HEAD when checking out a branch
- Improved layout
  - The input `path` is always relative to $GITHUB_WORKSPACE
  - Aligns better with container actions, where $GITHUB_WORKSPACE gets mapped in
- Fallback to REST API download
  - When Git 2.18 or higher is not in the PATH, the REST API will be used to download the files
  - When using a job container, the container's PATH is used

Refer [here](https://github.com/actions/checkout/blob/v1/README.md) for previous versions.

# Usage

<!-- start usage -->
```yaml
- 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 the workspace folder to place the repository
    path: ''

    # allows path option to result in a path that is a parent of the working
    # directory. This may have unforseen consequences.
    # Default: false
    allow_parent_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: ''
```
<!-- end usage -->

# Scenarios

- [Fetch all history for all tags and branches](#Fetch-all-history-for-all-tags-and-branches)
- [Checkout a different branch](#Checkout-a-different-branch)
- [Checkout HEAD^](#Checkout-HEAD)
- [Checkout multiple repos (side by side)](#Checkout-multiple-repos-side-by-side)
- [Checkout multiple repos (nested)](#Checkout-multiple-repos-nested)
- [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
- [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit)
- [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event)
- [Push a commit using the built-in token](#Push-a-commit-using-the-built-in-token)

## Fetch all history for all tags and branches

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

## Checkout a different branch

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

## Checkout HEAD^

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

## Checkout multiple repos (side by side)

```yaml
- 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
```

## Checkout multiple repos (nested)

```yaml
- name: Checkout
  uses: actions/checkout@v2

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

## Checkout multiple repos (private)

```yaml
- 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
```

> - `${{ github.token }}` is scoped to the current repository, so if you want to checkout a different repository that is private you will need to provide your own [PAT](https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line).


## Checkout pull request HEAD commit instead of merge commit

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

## Checkout pull request on closed event

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

## Push a commit using the built-in token

```yaml
on: push
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: |
          date > generated.txt
          git config user.name github-actions
          git config user.email github-actions@github.com
          git add .
          git commit -m "generated"
          git push          
```

# License

The scripts and documentation in this project are released under the [MIT License](LICENSE)