anchor.diff:  
       # TODO add nix-env -i command and verify that root can install additional
       # tools such as git or sshfs-fuse!
  -    # run this test when booting both: the iso and the installed system
       pkgs.runCommand "nixos-installation-test" { inherit systemDerivation; } ''
   
       INFO(){ echo "INFO: " $@; }
  
positive.code:     INFO "booting installed system"
      RUN_KVM -boot c
      waitForSSHD
      SHUTDOWN_VM
  
      echo "$(date) success" > $out
  
negative.code:     # creating shell script for debugging purposes
      cat >> run-kvm.sh << EOF
      #!/bin/sh -e
  
      # don't ask me why I have to remove the socket.. If I don't it won't be
      # reused by kvm_qemu!
      rm $SOCKET_NAME || true
      exec qemu-system-x86_64 -m 512 \
          -no-kvm-irqchip \
          -net nic,model=virtio -net user -smb /nix \
  