$ nix-build docker.nix

these derivations will be built:
  /nix/store/lvf7009avc7h7xwab9vylgc5smghjn86-monitor-lib-0.0.1.0.drv
  /nix/store/849shif6w9i85gjp7wmav9cm39w9hjfy-docker-layer-monitor.drv
  /nix/store/ib20yhr9mx18dpzkvhfa0rjrvj7763wl-alpine-3.3.drv
  /nix/store/s15gf4gjxd9qnvfjiagc707pa6q447hr-runtime-deps.drv
  /nix/store/zd8l6v65p4ias226wkk4yp7v09dkixaz-alpine-3.3.tar.gz.drv
  /nix/store/kn2mp235qi50pd25dykrkvd63ald2wj7-docker-image-monitor.tar.gz.drv
building path(s) ‘/nix/store/rbm7imnwv6r1h3wm9m4zkf329lpk9y0z-alpine-3.3’
building path(s) ‘/nix/store/fqmhzzhk6fviwrjd3bn8l2zgq35ih4w2-monitor-lib-0.0.1.0’
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0setupCompilerEnvironmentPhase
Build with /nix/store/qhs7f6yk5b8ipfcwdnq20gbdg2dbg0zq-ghc-8.0.2.

100     2    0     2    0     0      2      0 --:--:-- --:--:-- --:--:--     3
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0unpacking sources
unpacking source archive /nix/store/k7ck0d3wh3xwlpwrmwkahcrzgxgvd18d-monitor
source root is monitor
patching sources
compileBuildDriverPhase
setupCompileFlags: -package-db=/tmp/nix-build-monitor-lib-0.0.1.0.drv-0/package.conf.d -j1 -threaded

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0[1 of 1] Compiling Main             ( Setup.hs, /tmp/nix-build-monitor-lib-0.0.1.0.drv-0/Main.o )
Linking Setup ...

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404 NOT FOUND
builder for ‘/nix/store/ib20yhr9mx18dpzkvhfa0rjrvj7763wl-alpine-3.3.drv’ failed with exit code 22
cannot build derivation ‘/nix/store/zd8l6v65p4ias226wkk4yp7v09dkixaz-alpine-3.3.tar.gz.drv’: 1 dependencies couldn't be built
cannot build derivation ‘/nix/store/kn2mp235qi50pd25dykrkvd63ald2wj7-docker-image-monitor.tar.gz.drv’: 1 dependencies couldn't be built
error: build of ‘/nix/store/kn2mp235qi50pd25dykrkvd63ald2wj7-docker-image-monitor.tar.gz.drv’ failed