these 12 derivations will be built:
  /nix/store/2a1z0wkvip11gpgrqyjkxqqhn9k3ll5a-stage-2-init.sh.drv
  /nix/store/7b3rsqh0igdh4svmq6pbrsixsgi9l1sk-boot.json.drv
  /nix/store/klpbhfqpa80dd741jb3by0419j5l2fj5-builder.pl.drv
  /nix/store/jp37i1pvjvk5j16jm29k3vml1hlhmlwx-perl-5.42.0-env.drv
  /nix/store/3hn3l0sr88vhi52vvlwchpgfy96yvnhx-nixos-system-server-test.drv
  /nix/store/ygcnpc8gjimfnynlqmgpp2wzn06q0rmh-nixos-system-server-test.drv
  /nix/store/dhn6xar61nbvm0l30f88v5c20fza431a-nixos-system-server-test.drv
  /nix/store/l73kmrnnx1iw661xnv8gk3rh0hqslvbj-closure-info.drv
  /nix/store/zprgn8mvx1f7bk1lh8i3zw13m5g08sfw-run-nixos-vm.drv
  /nix/store/2dshlhd4ppldg2sy93r1jhr749lg1i26-nixos-vm.drv
  /nix/store/wca1m4db552sfmawj4hbkql8a6qs0np1-nixos-test-driver-pgroonga.drv
  /nix/store/1z47alg6jyglghh6qmdib21rajhwhxcj-vm-test-run-pgroonga.drv
building '/nix/store/3hn3l0sr88vhi52vvlwchpgfy96yvnhx-nixos-system-server-test.drv' on 'ssh-ng://builder@mac-linux-builder'