$ nix-instantiate hello.nix
/nix/store/z77vn965a59irqnrrjvbspiyl2rph0jp-hello.drv
$ nix-store -r /nix/store/z77vn965a59irqnrrjvbspiyl2rph0jp-hello.drv
/nix/store/a42k52zwv6idmf50r9lps1nzwq9khvpf-hello
$ nix-store -q --references /nix/store/a42k52zwv6idmf50r9lps1nzwq9khvpf-hello
/nix/store/94n64qy99ja0vgbkf675nyk39g9b978n-glibc-2.19
/nix/store/8jm0wksask7cpf85miyakihyfch1y21q-gcc-4.8.3
/nix/store/a42k52zwv6idmf50r9lps1nzwq9khvpf-hello