anchor.diff:      [global]
       security = user
       map to guest = Bad User
  +    guest account = root
       workgroup = cygwin
       netbios name = controller
       server string = %h
  
positive.code:       -o trans=virtio,version=9p2000.L,msize=262144,cache=loose \
        xchg /fs/xchg
  
      cat > /fs/etc/passwd <<PASSWD
      root:x:0:0::/root:/bin/false
      nobody:x:65534:65534::/var/empty:/bin/false
      PASSWD
  
      set +e
      chroot /fs $command $out
  
negative.code: 
      [nixstore]
      path = /nix/store
      writable = yes
      guest ok = yes
  
      [xchg]
      path = /xchg
      writable = yes
      guest ok = yes
      CONFIG
  
  