.github/actions/setup_nix/action.yml

name: Install Nix
description: Installs Nix or a Nix-compatible flake fork, while also enabling
  the requisite caches.
inputs:
  shell:
    description: "Shell to use for glue logic"
    required: true
    default: "bash"
  github_token:
    description: "A token for the Nix daemon to use when fetching information from GitHub"
    required: false
    default: ""
  nix_cache_domain:
    description: "An additional https-hosted Nix build cache"
    required: false
    default: ""
  nix_public_key:
    description: "The public key for the aforementioned Nix cache if specified"
    required: false
    default: ""
runs:
  using: "composite"
  steps:
    - name: Set GitHub Token Config String
      if: inputs.github_token != ''
      shell: ${{ inputs.shell }}
      run: |
        echo "GITHUB_ACCESS_TOKEN_STR=${{ inputs.github_token }}" >> $GITHUB_ENV
    - name: Set Nix Cache Config Strings
      if: inputs.nix_cache_domain != '' && inputs.nix_public_key != ''
      shell: ${{ inputs.shell }}
      run: |
        echo "EXTRA_SUBSTITUTER_STR=https://${{ inputs.nix_cache_domain }}" >> $GITHUB_ENV
        echo "EXTRA_TRUSTED_KEY_STR=${{ inputs.nix_public_key }}" >> $GITHUB_ENV
    - uses: DeterminateSystems/nix-installer-action@main
      with:
        determinate: false
        extra-conf: |
          access-tokens = ${{ env.GITHUB_ACCESS_TOKEN_STR }}
          extra-substituters = ${{ env.EXTRA_SUBSTITUTER_STR }} https://nix-cache.fossi-foundation.org
          extra-trusted-public-keys = ${{ env.EXTRA_TRUSTED_KEY_STR }} nix-cache.fossi-foundation.org:3+K59iFwXqKsL7BNu6Guy0v+uTlwsxYQxjspXzqLYQs=
    - name: Inject GitHub Token into Environment
      if: inputs.github_token != ''
      uses: fossi-foundation/nix-eda/.github/actions/nix_daemon_inject_github_token@5.5.0
      with:
        github_token: ${{ inputs.github_token }}