anchor.diff:        system = "x86_64-linux";
       };
   
  -
       "fedora-36" = {
         image = import <nix/fetchurl.nix> {
           url = https://app.vagrantup.com/generic/boxes/fedora36/versions/4.1.12/providers/libvirt.box;
  
positive.code: 
      install-force-no-daemon = {
        script = ''
          set -eux
  
          tar -xf ./nix.tar.xz
          mv ./nix-* nix
          ./nix/install --no-daemon
  
negative.code:           sleep 1
          done
  
          if [[ -n $postBoot ]]; then
            echo "Running post-boot commands..."
            $ssh "set -ex; $postBoot"
          fi
  
          echo "Copying installer..."
          scp -P 20022 $ssh_opts $binaryTarball/nix-*.tar.xz vagrant@localhost:nix.tar.xz
  
          echo "Running installer..."
          $ssh "set -eux; $installScript"
  
          echo "Testing Nix installation..."
          # FIXME: should update ~/.bashrc.
          $ssh "
            set -ex
            source ~/.bash_profile || source ~/.bash_login || source ~/.profile || true
            nix-env --version
            nix --extra-experimental-features nix-command store ping
          "
  
          echo "Done!"
          touch $out
  