update-flake-lock/action.yml

name: 'Update flake.lock'
description: 'Update your flake.lock and send a PR'
inputs:
  inputs:
    description: 'A space-separated list of inputs to update. Leave empty to update all inputs.'
    required: false
    default: ''
  token:
    description: 'GITHUB_TOKEN or a `repo` scoped Personal Access Token (PAT)'
    required: false
    default: ${{ github.token }}
  pr-title:
    description: 'The title of the Pull Request to be created'
    required: false
    default: "flake.lock: Update"
runs:
  using: "composite"
  steps:
    - run: |
        if [[ -n '${{ inputs.inputs }}' ]]; then
          inputs=()
          for input in ${{ inputs.inputs }}; do
            inputs+=("--update-input" "$input")
          done
          nix flake lock "${inputs[@]}" --commit-lock-file
        else
          nix flake update --commit-lock-file
        fi
      shell: bash
      env:
        GIT_AUTHOR_NAME: github-actions[bot]
        GIT_AUTHOR_EMAIL: <github-actions[bot]@users.noreply.github.com>
        GIT_COMMITTER_NAME: github-actions[bot]
        GIT_COMMITTER_EMAIL: <github-actions[bot]@users.noreply.github.com>
    - run: |
        content="$(git log --format=%b -n 1)"
        content="${content//'%'/'%25'}"
        content="${content//$'\n'/'%0A'}"
        content="${content//$'\r'/'%0D'}"
        echo "::set-output name=msg::$content"
      shell: bash
      id: commit_message
    - name: Create PR
      uses: peter-evans/create-pull-request@v3
      with:
        branch: update_flake_lock_action
        delete-branch: true
        title: ${{ inputs.pr-title }}
        token: ${{ inputs.token }}
        body: |
          Automated changes by the [update-flake-lock](https://github.com/DeterminateSystems/update-flake-lock) GitHub Action.

          ```
          ${{ steps.commit_message.outputs.msg }}
          ```

          ### Running GitHub Actions on this PR

          GitHub Actions will not run workflows on pull requests which are opened by a GitHub Action.

          To run GitHub Actions workflows on this PR, run:

          ```sh
          git branch -D update_flake_lock_action
          git fetch origin
          git checkout update_flake_lock_action
          git commit --amend --no-edit
          git push origin update_flake_lock_action --force
          ```