{ nixpkgs ? import {}, compiler ? "ghc902", doBenchmark ? false }: let inherit (nixpkgs) pkgs; f = { mkDerivation, aeson, base, blaze-html, blaze-markup , bytestring, cassava, conduit, conferer, conferer-aeson , conferer-warp, conferer-yaml, containers, data-default-class , directory, either, exceptions, extra, fmt, hoauth2, http-api-data , http-media, insert-ordered-containers, lens, lib, monad-logger , mtl, path-pieces, persistent, persistent-postgresql , prometheus-client, prometheus-metrics-ghc, protocol-buffers , protocol-buffers-descriptor, regex-tdfa, resource-pool, servant , servant-docs, servant-server, servant-swagger, servant-websockets , shakespeare, stm, swagger2, text, time, timezone-olson , timezone-series, transformers, unliftio-core, uri-bytestring , uuid, vector, vector-algorithms, wai-extra, warp, websockets , yesod, yesod-auth, yesod-auth-oauth2, yesod-core, yesod-form , zip-archive }: mkDerivation { pname = "tracktrain"; version = "0.1.0.0"; src = ./.; isLibrary = false; isExecutable = true; libraryHaskellDepends = [ aeson base blaze-html blaze-markup bytestring cassava conduit conferer conferer-warp containers either exceptions extra fmt hoauth2 http-api-data http-media insert-ordered-containers lens monad-logger mtl path-pieces persistent persistent-postgresql prometheus-client prometheus-metrics-ghc protocol-buffers protocol-buffers-descriptor regex-tdfa resource-pool servant servant-docs servant-server servant-swagger servant-websockets shakespeare stm swagger2 text time timezone-olson timezone-series transformers unliftio-core uri-bytestring uuid vector vector-algorithms warp websockets yesod yesod-auth yesod-auth-oauth2 yesod-core yesod-form zip-archive ]; executableHaskellDepends = [ aeson base bytestring conferer conferer-aeson conferer-yaml data-default-class directory extra fmt monad-logger persistent-postgresql protocol-buffers time wai-extra warp ]; doHaddock = false; description = "tracktrain tracks trains on their traintracks"; license = "unknown"; mainProgram = "tracktrain"; postInstall = '' cp -r $src/assets $out/assets ''; }; haskellPackages = if compiler == "default" then pkgs.haskellPackages else pkgs.haskell.packages.${compiler}; variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id; # we can override haskell packages in nix here; but attempt to minimise that # since builds get pretty expensive when we do. hpkgs = haskellPackages.override { overrides = self: super: with pkgs.haskell.lib; { # hoauth2 = doDistribute super.hoauth2_2_6_0; # cryptonite = doDistribute super.cryptonite_0_30; # memory = doDistribute super.memory_0_18_0; }; }; drv = variant (hpkgs.callPackage f {}); # this removes the /lib directory from the built derivation, which depends on ghc. # this dramatically reduces closure size stripLib = drv: pkgs.stdenv.mkDerivation { name = drv.name + "-without-lib"; src = drv.outPath; buildPhase = '' mkdir -p $out cp -r $src/bin $out cp -r $src/assets $out/assets ''; phases = [ "buildPhase" ]; }; in stripLib drv