name: 'Initialize CI Environment and Repository for Flake Builds'
description: |
  Initialize a Nix Flakes CI environment (optionally with LFS).
inputs:
  token:
    description: 'OAUTH token to access repositories'
    required: false
    default: ${{ github.token }}
  lfs:
    description: Whether to enable lfs. Note that nix flake builds don't support LFS currently.
    required: false
    default: false
runs:
  using: "composite"
  steps:
    - name: Checkout Repository
      shell: bash
      run: |
        if [ "${{ inputs.lfs }}" == "true" ]; then git lfs install; fi
        echo -e "machine ${GITHUB_SERVER_URL##https://}\nlogin oauth2\npassword ${{ inputs.token }}" > ~/.netrc
        # Disable clone protection to pull LFS as well
        GIT_CLONE_PROTECTION_ACTIVE=false git clone --branch $GITHUB_REF_NAME --recurse-submodules $GITHUB_SERVER_URL/$GITHUB_REPOSITORY .
        git submodule update --init --recursive

    - name: Prefetch git submodules in nix store
      run: git submodule foreach --recursive 'nix flake prefetch'