this derivation will be built:
  /nix/store/m8hmv4b0lsdq48pi1jq83xvx3bhcxz2n-udev-custom-callback-0.3.drv
this path will be fetched (0.0 KiB download, 6.3 KiB unpacked):
  /nix/store/mkxbbww5bcwi0hhy9ndcncgqpj07800i-shadow-4.20.3-dev
building '/nix/store/m8hmv4b0lsdq48pi1jq83xvx3bhcxz2n-udev-custom-callback-0.3.drv' on 'ssh-ng://nix-remote-builder@rofl-13.brkn.lol'
building '/nix/store/m8hmv4b0lsdq48pi1jq83xvx3bhcxz2n-udev-custom-callback-0.3.drv'
udev-custom-callback-0.3> Running phase: installPhase

upload niks3: ok