this derivation will be built:
  /nix/store/42ldynn5iyxm0h6wvmnqzxb206q1vg37-quake3-demodata-1.11-6.drv
building '/nix/store/42ldynn5iyxm0h6wvmnqzxb206q1vg37-quake3-demodata-1.11-6.drv'
quake3-demodata-1.11-6> tar: A lone zero block at 106740

upload niks3: ok