Less flaky nix build

Don't rely on cabal2nix at build time.

bookme.nix

+{ mkDerivation, aeson, base, blaze-markup, bytestring
+, case-insensitive, classy-prelude, classy-prelude-yesod
+, containers, data-default, directory, exceptions, fast-logger
+, file-embed, foreign-store, gitrev, gogol, gogol-apps-calendar
+, hjsmin, hpack, hspec, http-client-tls, http-conduit, http-types
+, lens, monad-control, monad-logger, shakespeare, sorted-list
+, stdenv, template-haskell, text, time, transformers, tz
+, unordered-containers, vector, wai, wai-extra, wai-logger, warp
+, yaml, yesod, yesod-core, yesod-form, yesod-static, yesod-test
+}:
+mkDerivation {
+  pname = "bookme";
+  version = "0.0.0";
+  src = ./.;
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    aeson base blaze-markup bytestring case-insensitive classy-prelude
+    classy-prelude-yesod containers data-default directory exceptions
+    fast-logger file-embed foreign-store gitrev gogol
+    gogol-apps-calendar hjsmin http-client-tls http-conduit http-types
+    lens monad-control monad-logger shakespeare sorted-list
+    template-haskell text time transformers tz unordered-containers
+    vector wai wai-extra wai-logger warp yaml yesod yesod-core
+    yesod-form yesod-static
+  ];
+  libraryToolDepends = [ hpack ];
+  executableHaskellDepends = [
+    aeson base blaze-markup bytestring case-insensitive classy-prelude
+    classy-prelude-yesod containers data-default directory exceptions
+    fast-logger file-embed foreign-store gitrev gogol
+    gogol-apps-calendar hjsmin http-client-tls http-conduit http-types
+    lens monad-control monad-logger shakespeare sorted-list
+    template-haskell text time transformers tz unordered-containers
+    vector wai wai-extra wai-logger warp yaml yesod yesod-core
+    yesod-form yesod-static
+  ];
+  testHaskellDepends = [
+    aeson base blaze-markup bytestring case-insensitive classy-prelude
+    classy-prelude-yesod containers data-default directory exceptions
+    fast-logger file-embed foreign-store gitrev gogol
+    gogol-apps-calendar hjsmin hspec http-client-tls http-conduit
+    http-types lens monad-control monad-logger shakespeare sorted-list
+    template-haskell text time transformers tz unordered-containers
+    vector wai wai-extra wai-logger warp yaml yesod yesod-core
+    yesod-form yesod-static yesod-test
+  ];
+  preConfigure = "hpack";
+  license = stdenv.lib.licenses.unfree;
+  hydraPlatforms = stdenv.lib.platforms.none;
+}

default.nix

@@ -2,40 +2,88 @@
 }:
 with nixpkgs;
 let
-  stackageVersion = "lts-1110";
+  # This requires the nixpkgs-stackage overlay.
+  hpkgs = nixpkgs.pkgs.haskell.packages.stackage.lts-1110;
+  hlib = nixpkgs.pkgs.haskell.lib;
 
-  stackageSrc = pkgs.fetchgit {
-    url = "https://github.com/typeable/nixpkgs-stackage.git";
-    rev = "7c94ec65e12850e7dd5282e83a6da91f88cb8857";
-    sha256 = "1ihsbgb9agg1f5q7mk3ycja6njbrg1dqlxniav47kyr9cm5ng0kn";
-  };
-
-  gogolSrc = pkgs.fetchgit {
+  # The gogol package is not part of stackage LTS, and it's a bit
+  # tricky to build. Best results so far are with LTS specified above
+  # and the gogol revision specified here.
+  gogol-src = pkgs.fetchgit {
     url = "https://github.com/brendanhay/gogol.git";
     rev = "344c9f781560e1ed8395b17e370ba1b085f2edc2";
     sha256 = "0f48mh7f2ifk3b7rjwgn9cwmi6845xv9zvs07khycbk70959pk1n";
   };
 
-  stackageOverlay = import stackageSrc;
-  nixpkgs' = import pkgs.path { overlays = [stackageOverlay]; };
-  haskell = nixpkgs'.pkgs.haskell;
+  gogol-core =
+    { mkDerivation, aeson, attoparsec, base, bifunctors, bytestring
+    , case-insensitive, conduit, dlist, exceptions, hashable
+    , http-api-data, http-client, http-media, http-types, lens
+    , resourcet, scientific, servant, stdenv, tasty, text, time
+    , unordered-containers
+    }:
+    mkDerivation {
+      pname = "gogol-core";
+      version = "0.3.0";
+      src = gogol-src;
+      preCompileBuildDriver = "cd core";
+      libraryHaskellDepends = [
+        aeson attoparsec base bifunctors bytestring case-insensitive
+        conduit dlist exceptions hashable http-api-data http-client
+        http-media http-types lens resourcet scientific servant text time
+        unordered-containers
+      ];
+      testHaskellDepends = [ base tasty ];
+      homepage = "https://github.com/brendanhay/gogol";
+      description = "Core data types and functionality for Gogol libraries";
+      license = "unknown";
+    };
 
-  mkNix = name: loc: pkgs.runCommand name {} ''
-    ${pkgs.cabal2nix}/bin/cabal2nix ${loc} >$out
-  '';
+  gogol =
+    { mkDerivation, aeson, base, bytestring, case-insensitive, conduit
+    , conduit-extra, cryptonite, directory, exceptions, filepath
+    , gogol-core, http-client, http-conduit, http-media, http-types
+    , lens, memory, mime-types, mtl, resourcet, stdenv, text, time
+    , transformers, unliftio-core, unordered-containers, x509
+    , x509-store
+    }:
+    mkDerivation {
+      pname = "gogol";
+      version = "0.3.0";
+      src = gogol-src;
+      preCompileBuildDriver = "cd gogol";
+      libraryHaskellDepends = [
+        aeson base bytestring case-insensitive conduit conduit-extra
+        cryptonite directory exceptions filepath gogol-core http-client
+        http-conduit http-media http-types lens memory mime-types mtl
+        resourcet text time transformers unliftio-core unordered-containers
+        x509 x509-store
+      ];
+      homepage = "https://github.com/brendanhay/gogol";
+      description = "Comprehensive Google Services SDK";
+      license = "unknown";
+    };
 
-  gogolCoreNix = mkNix "gogol-core.nix" "${gogolSrc}/core";
-  gogolNix     = mkNix "gogol.nix"      "${gogolSrc}/gogol";
-  gogolCalNix  = mkNix "gogol-cal.nix"  "${gogolSrc}/gogol-apps-calendar";
-  bookmeNix    = mkNix "bookme.nix" ./.;
+  gogol-cal =
+    { mkDerivation, base, gogol-core, stdenv }:
+    mkDerivation {
+      pname = "gogol-apps-calendar";
+      version = "0.3.0";
+      src = gogol-src;
+      preCompileBuildDriver = "cd gogol-apps-calendar";
+      libraryHaskellDepends = [ base gogol-core ];
+      homepage = "https://github.com/brendanhay/gogol";
+      description = "Google Calendar SDK";
+      license = "unknown";
+    };
 
-  hpkgs = haskell.packages.stackage.${stackageVersion}.override {
+  hpkgs' = hpkgs.override {
     overrides = self: super: {
-      gogol-core          = self.callPackage gogolCoreNix {};
-      gogol               = self.callPackage gogolNix {};
-      gogol-apps-calendar = self.callPackage gogolCalNix {};
-      alex = haskell.lib.dontCheck super.alex;
-      bookme = self.callPackage bookmeNix {};
+      alex = hlib.dontCheck super.alex;
+      bookme = self.callPackage (import ./bookme.nix) {};
+      gogol-core = self.callPackage gogol-core {};
+      gogol = self.callPackage gogol {};
+      gogol-apps-calendar = self.callPackage gogol-cal {};
       # mkDerivation = args: super.mkDerivation (args // {
       #   enableLibraryProfiling = false;
       #   doHoogle = false;
@@ -44,4 +92,4 @@ let
     };
   };
 in
-haskell.lib.justStaticExecutables hpkgs.bookme
+hlib.justStaticExecutables hpkgs'.bookme