$  nix show-derivation /nix/store/cwgrvr8vhzxijwrvigp4kxdslmsfizn2-source.drv
{
  "/nix/store/cwgrvr8vhzxijwrvigp4kxdslmsfizn2-source.drv": {
    "outputs": {
      "out": {
        "path": "/nix/store/fd3y797jj0z5cmg19s4fsxx6n8b8b3y0-source",
        "hashAlgo": "r:sha256",
        "hash": "3330a2a596f2508435c5a08a1d13c98f5d16c9666b6a34e9ddb3efcd50cac510"
      }
    },
    "inputSrcs": [
      "/nix/store/qjk2h301faawvbnhv5azhyiaw6vrqalg-builder.sh"
    ],
    "inputDrvs": {
      "/nix/store/3byfg9bn21ap2vgwsvzj5chvfwfdakmx-mirrors-list.drv": [
        "out"
      ],
      "/nix/store/j730dxkwvxdqzwccpf4hjhxpn2vdaqkp-curl-7.61.0.drv": [
        "dev"
      ],
      "/nix/store/m663jln8hqmhl35fy3jh00aaxhs0r1pm-stdenv-linux.drv": [
        "out"
      ],
      "/nix/store/nbsd7ickb5djv68b6511c30p2c5f0lfg-unzip-6.0.drv": [
        "out"
      ],
      "/nix/store/z7pkrfk5fmggdzyhpjzxv0bfx6mxvh75-bash-4.4-p23.drv": [
        "out"
      ]
    },
    "platform": "x86_64-linux",
    "builder": "/nix/store/dkh7l9a4sx7zqh8riqbj3z21sz25p8xy-bash-4.4-p23/bin/bash",
    "args": [
      "-e",
      "/nix/store/qjk2h301faawvbnhv5azhyiaw6vrqalg-builder.sh"
    ],
    "env": {
      "buildInputs": "",
      "builder": "/nix/store/dkh7l9a4sx7zqh8riqbj3z21sz25p8xy-bash-4.4-p23/bin/bash",
      "configureFlags": "",
      "curlOpts": "",
      "depsBuildBuild": "",
      "depsBuildBuildPropagated": "",
      "depsBuildTarget": "",
      "depsBuildTargetPropagated": "",
      "depsHostHost": "",
      "depsHostHostPropagated": "",
      "depsTargetTarget": "",
      "depsTargetTargetPropagated": "",
      "downloadToTemp": "1",
      "executable": "",
      "impureEnvVars": "http_proxy https_proxy ftp_proxy all_proxy no_proxy NIX_CURL_FLAGS NIX_HASHED_MIRRORS NIX_CONNECT_TIMEOUT NIX_MIRRORS_alsa NIX_MIRRORS_apache NIX_MIRRORS_bioc NIX_MIRRORS_bitlbee NIX_MIRRORS_cpan NIX_MIRRORS_debian NIX_MIRRORS_fedora NIX_MIRRORS_gcc NIX_MIRRORS_gentoo NIX_MIRRORS_gnome NIX_MIRRORS_gnu NIX_MIRRORS_gnupg NIX_MIRRORS_hackage NIX_MIRRORS_hashedMirrors NIX_MIRRORS_imagemagick NIX_MIRRORS_kde NIX_MIRRORS_kernel NIX_MIRRORS_maven NIX_MIRRORS_metalab NIX_MIRRORS_mozilla NIX_MIRRORS_mysql NIX_MIRRORS_oldsuse NIX_MIRRORS_openbsd NIX_MIRRORS_opensuse NIX_MIRRORS_postgresql NIX_MIRRORS_pypi NIX_MIRRORS_roy NIX_MIRRORS_sageupstream NIX_MIRRORS_samba NIX_MIRRORS_savannah NIX_MIRRORS_sourceforge NIX_MIRRORS_sourceforgejp NIX_MIRRORS_steamrt NIX_MIRRORS_ubuntu NIX_MIRRORS_xfce NIX_MIRRORS_xorg",
      "mirrorsFile": "/nix/store/kj1xcn9491bz137cxzk95jlnj2db3nfn-mirrors-list",
      "name": "source",
      "nativeBuildInputs": "/nix/store/ijmi8n723yqgc1wgchaw57ynm6z0czac-curl-7.61.0-dev /nix/store/srap5gybvswlgqmwn9pzp5d4cccdr7lp-unzip-6.0",
      "nixpkgsVersion": "18.09",
      "out": "/nix/store/fd3y797jj0z5cmg19s4fsxx6n8b8b3y0-source",
      "outputHash": "0465r98cvvxkvplk8skbcv4icpcgr49iv2m0qlsq8l7jjsjs4c1k",
      "outputHashAlgo": "sha256",
      "outputHashMode": "recursive",
      "postFetch": "export PATH=/nix/store/srap5gybvswlgqmwn9pzp5d4cccdr7lp-unzip-6.0/bin:$PATH\n\nunpackDir=\"$TMPDIR/unpack\"\nmkdir \"$unpackDir\"\ncd \"$unpackDir\"\n\nrenamed=\"$TMPDIR/archive.tar.gz?sha=v9.4.0\"\nmv \"$downloadedFile\" \"$renamed\"\nunpackFile \"$renamed\"\nif [ $(ls \"$unpackDir\" | wc -l) != 1 ]; then\n  echo \"error: zip file must contain a single file or directory.\"\n  echo \"hint: Pass stripRoot=false; to fetchzip to assume flat list of files.\"\n  exit 1\nfi\nfn=$(cd \"$unpackDir\" && echo *)\nif [ -f \"$unpackDir/$fn\" ]; then\n  mkdir $out\nfi\nmv \"$unpackDir/$fn\" \"$out\"\n",
      "preferHashedMirrors": "1",
      "preferLocalBuild": "1",
      "propagatedBuildInputs": "",
      "propagatedNativeBuildInputs": "",
      "showURLs": "",
      "stdenv": "/nix/store/308y8p82zjyzk19im5vbnalwxm2v95v8-stdenv-linux",
      "strictDeps": "",
      "system": "x86_64-linux",
      "urls": "https://gitlab.com/api/v4/projects/gitlab-org%2Fgitlab-ci-multi-runner/repository/archive.tar.gz?sha=v9.4.0"
    }
  }
}