134 lines
5.1 KiB
Nix
134 lines
5.1 KiB
Nix
# This expression takes a file like `hackage-packages.nix` and constructs
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# a full package set out of that.
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# required dependencies:
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{ pkgs, stdenv, all-cabal-hashes }:
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# arguments:
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# * ghc package to use
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# * package-set: a function that takes { pkgs, stdenv, callPackage } as first arg and `self` as second
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{ ghc, package-set }:
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# return value: a function from self to the package set
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self: let
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inherit (stdenv.lib) fix' extends makeOverridable;
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inherit (import ./lib.nix { inherit pkgs; }) overrideCabal;
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mkDerivationImpl = pkgs.callPackage ./generic-builder.nix {
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inherit stdenv;
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inherit (pkgs) fetchurl pkgconfig glibcLocales coreutils gnugrep gnused;
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nodejs = pkgs.nodejs-slim;
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jailbreak-cabal = if (self.ghc.cross or null) != null
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then self.ghc.bootPkgs.jailbreak-cabal
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else self.jailbreak-cabal;
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inherit (self) ghc;
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hscolour = overrideCabal self.hscolour (drv: {
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isLibrary = false;
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doHaddock = false;
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hyperlinkSource = false; # Avoid depending on hscolour for this build.
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postFixup = "rm -rf $out/lib $out/share $out/nix-support";
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});
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cpphs = overrideCabal (self.cpphs.overrideScope (self: super: {
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mkDerivation = drv: super.mkDerivation (drv // {
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enableSharedExecutables = false;
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enableSharedLibraries = false;
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doHaddock = false;
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useCpphs = false;
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});
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})) (drv: {
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isLibrary = false;
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postFixup = "rm -rf $out/lib $out/share $out/nix-support";
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});
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};
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mkDerivation = makeOverridable mkDerivationImpl;
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# manualArgs are the arguments that were explictly passed to `callPackage`, like:
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#
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# callPackage foo { bar = null; };
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#
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# here `bar` is a manual argument.
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callPackageWithScope = scope: fn: manualArgs:
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let
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# this code is copied from callPackage in lib/customisation.nix
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#
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# we cannot use `callPackage` here because we want to call `makeOverridable`
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# on `drvScope` (we cannot add `overrideScope` after calling `callPackage` because then it is
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# lost on `.override`) but determine the auto-args based on `drv` (the problem here
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# is that nix has no way to "passthrough" args while preserving the reflection
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# info that callPackage uses to determine the arguments).
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drv = if builtins.isFunction fn then fn else import fn;
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auto = builtins.intersectAttrs (builtins.functionArgs drv) scope;
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# this wraps the `drv` function to add a `overrideScope` function to the result.
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drvScope = allArgs: drv allArgs // {
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overrideScope = f:
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let newScope = mkScope (fix' (extends f scope.__unfix__));
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# note that we have to be careful here: `allArgs` includes the auto-arguments that
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# weren't manually specified. If we would just pass `allArgs` to the recursive call here,
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# then we wouldn't look up any packages in the scope in the next interation, because it
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# appears as if all arguments were already manually passed, so the scope change would do
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# nothing.
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in callPackageWithScope newScope drv manualArgs;
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};
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in stdenv.lib.makeOverridable drvScope (auto // manualArgs);
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mkScope = scope: pkgs // pkgs.xorg // pkgs.gnome2 // scope;
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defaultScope = mkScope self;
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callPackage = drv: args: callPackageWithScope defaultScope drv args;
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withPackages = packages: callPackage ./with-packages-wrapper.nix {
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inherit (self) llvmPackages;
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haskellPackages = self;
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inherit packages;
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};
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haskellSrc2nix = { name, src, sha256 ? null }:
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let
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sha256Arg = if isNull sha256 then "--sha256=" else ''--sha256="${sha256}"'';
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in pkgs.stdenv.mkDerivation {
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name = "cabal2nix-${name}";
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buildInputs = [ pkgs.cabal2nix ];
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phases = ["installPhase"];
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LANG = "en_US.UTF-8";
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LOCALE_ARCHIVE = pkgs.lib.optionalString pkgs.stdenv.isLinux "${pkgs.glibcLocales}/lib/locale/locale-archive";
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installPhase = ''
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export HOME="$TMP"
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mkdir -p "$out"
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cabal2nix --compiler=${self.ghc.name} --system=${stdenv.system} ${sha256Arg} "${src}" > "$out/default.nix"
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'';
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};
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hackage2nix = name: version: haskellSrc2nix {
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name = "${name}-${version}";
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sha256 = ''$(sed -e 's/.*"SHA256":"//' -e 's/".*$//' "${all-cabal-hashes}/${name}/${version}/${name}.json")'';
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src = "${all-cabal-hashes}/${name}/${version}/${name}.cabal";
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};
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in package-set { inherit pkgs stdenv callPackage; } self // {
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inherit mkDerivation callPackage haskellSrc2nix hackage2nix;
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callHackage = name: version: self.callPackage (self.hackage2nix name version);
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# Creates a Haskell package from a source package by calling cabal2nix on the source.
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callCabal2nix = name: src: self.callPackage (self.haskellSrc2nix { inherit src name; });
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ghcWithPackages = selectFrom: withPackages (selectFrom self);
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ghcWithHoogle = selectFrom:
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let
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packages = selectFrom self;
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hoogle = callPackage ./hoogle.nix {
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inherit packages;
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};
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in withPackages (packages ++ [ hoogle ]);
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ghc = ghc // {
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withPackages = self.ghcWithPackages;
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withHoogle = self.ghcWithHoogle;
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};
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}
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