anchor.diff:      [global]
       security = user
       map to guest = Bad User
  +    guest account = root
       workgroup = cygwin
       netbios name = controller
       server string = %h
  
positive.code: 
      [nixstore]
      path = /nix/store
      read only = no
      guest ok = yes
  
      [xchg]
      path = /xchg
      read only = no
      guest ok = yes
      CONFIG
  
  
negative.code:       -o trans=virtio,version=9p2000.L,msize=262144,cache=loose \
        xchg /fs/xchg
  
      echo root:x:0:0::/root:/bin/false > /fs/etc/passwd
  
      set +e
      chroot /fs $command $out
  