anchor.diff:      mount -o bind /dev /fs/dev
   
       echo "mounting host filesystem..."
  -    mount -t cifs //10.0.2.4/qemu /fs/hostfs -o guest,username=nobody
  +    mount -t cifs //10.0.2.4/qemu /fs/hostfs -o guest,sec=none
   
       mkdir -p /fs/nix/store
       mount -o bind /fs/hostfs/nix/store /fs/nix/store
  
positive.code: 
    startSamba =
      ''
        cat > $TMPDIR/smb.conf <<SMB
        [global]
          private dir = $TMPDIR
  
negative.code:         smb passwd file = $TMPDIR/smbpasswd
          security = share
        [qemu]
          force user = $WHO
          path = /
          read only = no
          guest ok = yes
  