this derivation will be built:
  /nix/store/j5dj568av62n9jkwvv4d92yyhnrik312-harmonia-llvm-cov-3.2.0.drv
building '/nix/store/j5dj568av62n9jkwvv4d92yyhnrik312-harmonia-llvm-cov-3.2.0.drv' on 'ssh-ng://customer@mac02'