Add tests for extra-hackages functionality

Author: maksbotan

overlays/haskell.nix

@@ -201,8 +201,12 @@ self: super: {
         dotCabal = { index-state, sha256, cabal-install, extra-hackage-tarballs ? [], ... }@args:
             let
               allTarballs = [ (hackageTarball args) ] ++ extra-hackage-tarballs;
+              allNames = self.lib.concatMapStringsSep "-" (tarball: tarball.name) allTarballs;
+              # Main Hackage index-state is embedded in its name and thus will propagate to
+              # dotCabalName anyway.
+              dotCabalName = "dot-cabal-" + allNames;
             in
-            self.runCommand "dot-cabal-at-${builtins.replaceStrings [":"] [""] index-state}" { nativeBuildInputs = [ cabal-install ]; } ''
+            self.runCommand dotCabalName { nativeBuildInputs = [ cabal-install ]; } ''
                 mkdir -p $out/.cabal
                 cat <<EOF > $out/.cabal/config
                 ${self.lib.concatStrings (

test/default.nix

@@ -175,6 +175,7 @@ let
     exe-only = callTest ./exe-only { inherit util; };
     stack-source-repo = callTest ./stack-source-repo {};
     lookup-sha256 = callTest ./lookup-sha256 {};
+    extra-hackage = callTest ./extra-hackage {};
 
     unit = unitTests;
   };

test/extra-hackage/01-index.tar.gz

@@ -0,0 +1,11 @@
+# Tests for extra Hackage functionality
+
+This directory contains two packages, `external-package-demo` and `external-package-user`, the
+second one depends on the first one. Both packages were created with `cabal init`.
+
+`external-package-demo` was uploaded to local Hackage at `localhost` and `01-index.tar.gz` from that
+Hackage was downloaded to this directory. Then the index file was processed with `hackage-to-nix`,
+the result is in `hackage/` directory.
+
+The tests check that `cabalProject'` is able to construct plan with dependencies from extra Hackage
+and then build the package itself.

test/extra-hackage/README.md

@@ -0,0 +1,28 @@
+{ cabalProject', testSrc }:
+
+let  
+  
+  hackage = import ./hackage;
+
+  tarball = {
+    name = "extra-hackage-demo";
+    index = ./01-index.tar.gz;
+  };
+
+  demo-src = ./external-package-demo-0.1.0.0.tar.gz;
+
+  project = cabalProject' {
+    src = testSrc "extra-hackage/external-package-user";
+
+    extra-hackages = [ hackage ];
+    extra-hackage-tarballs = [ tarball ];
+
+    modules = [
+      # To prevent nix-build from trying to download it from the
+      # actual Hackage.
+      { packages.external-package-demo.src = demo-src; }
+    ];
+  };
+
+in
+  project

test/extra-hackage/default.nix

@@ -0,0 +1,5 @@
+# Revision history for external-package-demo
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.

test/extra-hackage/external-package-demo-0.1.0.0.tar.gz

@@ -0,0 +1,8 @@
+module Main where
+
+import qualified MyLib (someFunc)
+
+main :: IO ()
+main = do
+  putStrLn "Hello, Haskell!"
+  MyLib.someFunc

test/extra-hackage/external-package-demo/CHANGELOG.md

@@ -0,0 +1,4 @@
+module MyLib (someFunc) where
+
+someFunc :: IO ()
+someFunc = putStrLn "someFunc"

test/extra-hackage/external-package-demo/Main.hs

@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain