anchor.diff:      # creating shell script for debugging purposes
       cat >> run-kvm.sh << EOF
       #!/bin/sh -e
  -    # maybe swap should be used ?
  +
  +    # 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 \
  
positive.code:     INFO "booting installed system"
      RUN_KVM -boot c
      waitForSSHD
      SHUTDOWN_VM
  
      echo "$(date) success" > $out
  
negative.code: 
      # TODO add nix-env -i command and verify that root can install additional
      # tools such as git or sshfs-fuse!
      pkgs.runCommand "nixos-installation-test" { inherit systemDerivation; } ''
  
      INFO(){ echo "INFO: " $@; }
  