Add some test cases for the component builder

test/README.md

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+### Haskell infrastructure test cases
+
+To execute the test cases, build from this directory:
+
+    nix-build --no-out-link default.nix
+

test/cabal-22/Main.hs

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+module Main where
+
+import Lib (message)
+
+main :: IO ()
+main = putStrLn message

test/cabal-22/Setup.hs

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+import Distribution.Simple
+main = defaultMain

test/cabal-22/default.nix

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+{ pkgs
+, haskell
+, stdenv
+}:
+
+with stdenv.lib;
+
+let
+  pkgSet = haskell.mkNewPkgSet {
+    inherit pkgs;
+    pkg-def = import ./plan.nix;
+    pkg-def-overlays = [
+      { project = ./project.nix; }
+    ];
+    modules = [ ];
+  };
+
+  packages = pkgSet.config.hsPkgs;
+
+in
+  stdenv.mkDerivation {
+    name = "cabal-22-test";
+
+    buildCommand = ''
+      exe="${packages.project.components.exes.project}/bin/project"
+
+      size=$(command stat --format '%s' "$exe")
+      printf "size of executable $exe is $size. \n" >& 2
+
+      # fixme: run on target platform when cross-compiled
+      printf "checking whether executable runs... " >& 2
+      "$exe"
+
+      # fixme: linux-specific
+      printf "checking that executable is dynamically linked to system libraries... " >& 2
+      ldd "$exe" | grep libpthread
+
+      # fixme: posix-specific
+      printf "checking that dynamic library is produced... " >& 2
+      sofile=$(find "${packages.project.components.library}" | grep -e '\.so$')
+      echo "$sofile"
+
+      printf "checking that dynamic library is dynamically linked to base... " >& 2
+      ldd "$sofile" | grep libHSbase
+
+      touch $out
+    '';
+
+    meta.platforms = platforms.all;
+} // { inherit (packages) project; }

test/cabal-22/lib/Lib.hs

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+module Lib (message) where
+
+message :: String
+message = "Hello, Haskell!"

test/cabal-22/plan.nix

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+hackage:
+  {
+    packages = {
+      "ghc-prim".revision = hackage."ghc-prim"."0.5.2.0".revisions.default;
+      "rts".revision = hackage."rts"."1.0".revisions.default;
+      "base".revision = hackage."base"."4.11.1.0".revisions.default;
+      "integer-gmp".revision = hackage."integer-gmp"."1.0.2.0".revisions.default;
+    };
+    compiler = {
+      version = "8.4.4";
+      nix-name = "ghc844";
+      packages = {
+        "ghc-prim" = "0.5.2.0";
+        "rts" = "1.0";
+        "base" = "4.11.1.0";
+        "integer-gmp" = "1.0.2.0";
+      };
+    };
+  }

test/cabal-22/project.cabal

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+cabal-version:       2.2
+-- Initial package description 'project.cabal' generated by 'cabal init'.
+-- For further documentation, see http://haskell.org/cabal/users-guide/
+
+name:                project
+version:             0.1.0.0
+-- synopsis:
+-- description:
+-- bug-reports:
+license:             NONE
+author:              Rodney Lorrimar
+maintainer:          rodney.lorrimar@iohk.io
+-- copyright:
+-- category:
+
+library
+  exposed-modules:     Lib
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       base ^>=4.11.1.0
+  hs-source-dirs:      lib
+  default-language:    Haskell2010
+
+executable project
+  main-is:             Main.hs
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       base ^>=4.11.1.0
+                     , project
+  -- hs-source-dirs:
+  default-language:    Haskell2010

test/cabal-22/project.nix

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+{ system
+, compiler
+, flags
+, pkgs
+, hsPkgs
+, pkgconfPkgs
+, ... }:
+  {
+    flags = {};
+    package = {
+      specVersion = "2.2";
+      identifier = {
+        name = "project";
+        version = "0.1.0.0";
+      };
+      license = "NONE";
+      copyright = "";
+      maintainer = "rodney.lorrimar@iohk.io";
+      author = "Rodney Lorrimar";
+      homepage = "";
+      url = "";
+      synopsis = "";
+      description = "";
+      buildType = "Simple";
+    };
+    components = {
+      "library" = {
+        depends = [ (hsPkgs.base) ];
+      };
+      exes = {
+        "project" = {
+          depends = [
+            (hsPkgs.base)
+            (hsPkgs.project)
+          ];
+        };
+      };
+    };
+  } // rec {
+    src = pkgs.lib.mkDefault ./.;
+  }

test/cabal-simple/Main.hs

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+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

test/cabal-simple/Setup.hs

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+import Distribution.Simple
+main = defaultMain

test/cabal-simple/cabal-simple.cabal

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+cabal-version:       >=1.10
+-- Initial package description 'cabal-simple.cabal' generated by 'cabal
+-- init'.  For further documentation, see
+-- http://haskell.org/cabal/users-guide/
+
+name:                cabal-simple
+version:             0.1.0.0
+-- synopsis:
+-- description:
+-- bug-reports:
+license:             PublicDomain
+author:              Rodney Lorrimar
+maintainer:          rodney.lorrimar@iohk.io
+-- category:
+build-type:          Simple
+
+library
+  -- exposed-modules:
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       base >=4.11 && <4.12
+  -- hs-source-dirs:
+  default-language:    Haskell2010
+
+executable cabal-simple
+  main-is:             Main.hs
+  -- other-modules:
+  -- other-extensions:
+  build-depends:       base >=4.11 && <4.12
+  -- hs-source-dirs:
+  default-language:    Haskell2010

test/cabal-simple/cabal-simple.nix

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+{ system
+, compiler
+, flags
+, pkgs
+, hsPkgs
+, pkgconfPkgs
+, ... }:
+  {
+    flags = {};
+    package = {
+      specVersion = "1.10";
+      identifier = {
+        name = "cabal-simple";
+        version = "0.1.0.0";
+      };
+      license = "LicenseRef-PublicDomain";
+      copyright = "";
+      maintainer = "rodney.lorrimar@iohk.io";
+      author = "Rodney Lorrimar";
+      homepage = "";
+      url = "";
+      synopsis = "";
+      description = "";
+      buildType = "Simple";
+    };
+    components = {
+      "library" = {
+        depends = [ (hsPkgs.base) ];
+      };
+      exes = {
+        "cabal-simple" = {
+          depends = [ (hsPkgs.base) ];
+        };
+      };
+    };
+  } // rec {
+    src = pkgs.lib.mkDefault ./.;
+  }

test/cabal-simple/default.nix

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+# Test a package set
+{ pkgs
+, haskell
+, stdenv
+}:
+
+with stdenv.lib;
+
+let
+  pkgSet = haskell.mkNewPkgSet {
+    inherit pkgs;
+    pkg-def = import ./plan.nix;
+    pkg-def-overlays = [
+      { cabal-simple = ./cabal-simple.nix;
+      }
+    ];
+    modules = [ ];
+  };
+
+  packages = pkgSet.config.hsPkgs;
+
+in
+  stdenv.mkDerivation {
+    name = "cabal-simple-test";
+
+    buildCommand = ''
+      exe="${packages.cabal-simple.components.exes.cabal-simple}/bin/cabal-simple"
+
+      size=$(command stat --format '%s' "$exe")
+      printf "size of executable $exe is $size. \n" >& 2
+
+      # fixme: run on target platform when cross-compiled
+      printf "checking whether executable runs... " >& 2
+      $exe
+
+      # fixme: linux-specific
+      printf "checking that executable is dynamically linked to system libraries... " >& 2
+      ldd $exe | grep libpthread
+
+      touch $out
+    '';
+
+    meta.platforms = platforms.all;
+} // { inherit (packages) cabal-simple; }
+
+## steps to generate local files
+# 1. cabal-to-nix cabal-simple.cabal > cabal-simple.nix
+# 2. cabal new-build
+# 3. plan-to-nix ./dist-newstyle/cache/plan.json > plan.nix

test/cabal-simple/plan.nix

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+hackage:
+  {
+    packages = {
+      "ghc-prim".revision = hackage."ghc-prim"."0.5.2.0".revisions.default;
+      "rts".revision = hackage."rts"."1.0".revisions.default;
+      "base".revision = hackage."base"."4.11.1.0".revisions.default;
+      "integer-gmp".revision = hackage."integer-gmp"."1.0.2.0".revisions.default;
+    };
+    compiler = {
+      version = "8.4.4";
+      nix-name = "ghc844";
+      packages = {
+        "ghc-prim" = "0.5.2.0";
+        "rts" = "1.0";
+        "base" = "4.11.1.0";
+        "integer-gmp" = "1.0.2.0";
+      };
+    };
+  }

test/default.nix

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+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+
+let
+  # all packages from hackage as nix expressions
+  hackage = import (fetchFromGitHub { owner  = "angerman";
+                                      repo   = "hackage.nix";
+                                      rev    = "66c28064da46525711722b75b4adb2ac878897d3";
+                                      sha256 = "12ffzzjgirwzha3ngxbniccgn19406iryxspq19kgi4kz9lz6bpr";
+                                      name   = "hackage-exprs-source"; });
+
+  # The new Haskell infra applied to nix representation of Hackage
+  haskell = import ../. hackage;
+
+in {
+  cabal-simple = callPackage ./cabal-simple { inherit haskell; };
+  cabal-22 = callPackage ./cabal-22 { inherit haskell; };
+}
+
+## possible test cases
+# 1. fully static linking
+# 2. presence of haddock
+# 3. cabal 2.4 stuff
+# 4. multiple libraries in a cabal project