472 lines
18 KiB
Nix
472 lines
18 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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{ # package-set used for build tools (all of nixpkgs)
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buildPackages
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, # A haskell package set for Setup.hs, compiler plugins, and similar
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# build-time uses.
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buildHaskellPackages
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, # package-set used for non-haskell dependencies (all of nixpkgs)
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pkgs
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, # stdenv provides our build and host platforms
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stdenv
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, # this module provides the list of known licenses and maintainers
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lib
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# needed for overrideCabal & packageSourceOverrides
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, haskellLib
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, # hashes for downloading Hackage packages
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all-cabal-hashes
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, # compiler to use
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ghc
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, # A function that takes `{ pkgs, lib, callPackage }` as the first arg and
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# `self` as second, and returns a set of haskell packages
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package-set
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, # The final, fully overriden package set usable with the nixpkgs fixpoint
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# overriding functionality
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extensible-self
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}:
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# return value: a function from self to the package set
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self:
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let
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inherit (stdenv) buildPlatform hostPlatform;
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inherit (lib) fix' extends makeOverridable;
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inherit (haskellLib) overrideCabal;
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mkDerivationImpl = pkgs.callPackage ./generic-builder.nix {
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inherit stdenv;
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nodejs = buildPackages.nodejs-slim;
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inherit (self) buildHaskellPackages ghc ghcWithHoogle ghcWithPackages;
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inherit (self.buildHaskellPackages) jailbreak-cabal;
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hscolour = overrideCabal self.buildHaskellPackages.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 lib.isFunction fn then fn else import fn;
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auto = builtins.intersectAttrs (lib.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 lib.makeOverridable drvScope (auto // manualArgs);
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mkScope = scope: let
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ps = pkgs.__splicedPackages;
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scopeSpliced = pkgs.splicePackages {
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pkgsBuildBuild = scope.buildHaskellPackages.buildHaskellPackages;
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pkgsBuildHost = scope.buildHaskellPackages;
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pkgsBuildTarget = {};
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pkgsHostHost = {};
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pkgsHostTarget = scope;
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pkgsTargetTarget = {};
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} // {
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# Don't splice these
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inherit (scope) ghc buildHaskellPackages;
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};
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in ps // ps.xorg // ps.gnome2 // { inherit stdenv; } // scopeSpliced;
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defaultScope = mkScope self;
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callPackage = drv: args: callPackageWithScope defaultScope drv args;
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withPackages = packages: buildPackages.callPackage ./with-packages-wrapper.nix {
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inherit (self) ghc llvmPackages;
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inherit packages;
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};
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# Use cabal2nix to create a default.nix for the package sources found at 'src'.
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haskellSrc2nix = { name, src, sha256 ? null, extraCabal2nixOptions ? "" }:
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let
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sha256Arg = if sha256 == null then "--sha256=" else ''--sha256="${sha256}"'';
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in buildPackages.stdenv.mkDerivation {
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name = "cabal2nix-${name}";
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nativeBuildInputs = [ buildPackages.cabal2nix-unwrapped ];
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preferLocalBuild = true;
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allowSubstitutes = false;
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phases = ["installPhase"];
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LANG = "en_US.UTF-8";
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LOCALE_ARCHIVE = pkgs.lib.optionalString (buildPlatform.libc == "glibc") "${buildPackages.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=${self.ghc.haskellCompilerName} --system=${hostPlatform.config} ${sha256Arg} "${src}" ${extraCabal2nixOptions} > "$out/default.nix"
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'';
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};
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all-cabal-hashes-component = name: version: buildPackages.runCommand "all-cabal-hashes-component-${name}-${version}" {} ''
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tar --wildcards -xzvf ${all-cabal-hashes} \*/${name}/${version}/${name}.{json,cabal}
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mkdir -p $out
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mv */${name}/${version}/${name}.{json,cabal} $out
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'';
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hackage2nix = name: version: let component = all-cabal-hashes-component name version; in self.haskellSrc2nix {
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name = "${name}-${version}";
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sha256 = ''$(sed -e 's/.*"SHA256":"//' -e 's/".*$//' "${component}/${name}.json")'';
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src = "${component}/${name}.cabal";
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};
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# Adds a nix file as an input to the haskell derivation it
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# produces. This is useful for callHackage / callCabal2nix to
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# prevent the generated default.nix from being garbage collected
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# (requiring it to be frequently rebuilt), which can be an
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# annoyance.
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callPackageKeepDeriver = src: args:
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overrideCabal (self.callPackage src args) (orig: {
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preConfigure = ''
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# Generated from ${src}
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${orig.preConfigure or ""}
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'';
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passthru = orig.passthru or {} // {
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# When using callCabal2nix or callHackage, it is often useful
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# to debug a failure by inspecting the Nix expression
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# generated by cabal2nix. This can be accessed via this
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# cabal2nixDeriver field.
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cabal2nixDeriver = src;
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};
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});
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in package-set { inherit pkgs lib callPackage; } self // {
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inherit mkDerivation callPackage haskellSrc2nix hackage2nix buildHaskellPackages;
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inherit (haskellLib) packageSourceOverrides;
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# callHackage :: Text -> Text -> AttrSet -> HaskellPackage
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#
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# e.g., while overriding a package set:
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# '... foo = self.callHackage "foo" "1.5.3" {}; ...'
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callHackage = name: version: callPackageKeepDeriver (self.hackage2nix name version);
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# callHackageDirect
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# :: { pkg :: Text, ver :: Text, sha256 :: Text }
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# -> AttrSet
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# -> HaskellPackage
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#
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# This function does not depend on all-cabal-hashes and therefore will work
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# for any version that has been released on hackage as opposed to only
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# versions released before whatever version of all-cabal-hashes you happen
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# to be currently using.
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callHackageDirect = {pkg, ver, sha256}:
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let pkgver = "${pkg}-${ver}";
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in self.callCabal2nix pkg (pkgs.fetchzip {
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url = "mirror://hackage/${pkgver}/${pkgver}.tar.gz";
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inherit sha256;
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});
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# Creates a Haskell package from a source package by calling cabal2nix on the source.
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callCabal2nixWithOptions = name: src: extraCabal2nixOptions: args:
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let
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filter = path: type:
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pkgs.lib.hasSuffix "${name}.cabal" path ||
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baseNameOf path == "package.yaml";
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expr = self.haskellSrc2nix {
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inherit name extraCabal2nixOptions;
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src = if pkgs.lib.canCleanSource src
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then pkgs.lib.cleanSourceWith { inherit src filter; }
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else src;
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};
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in overrideCabal (callPackageKeepDeriver expr args) (orig: {
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inherit src;
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});
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callCabal2nix = name: src: args: self.callCabal2nixWithOptions name src "" args;
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# : { root : Path
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# , name : Defaulted String
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# , source-overrides : Defaulted (Either Path VersionNumber)
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# , overrides : Defaulted (HaskellPackageOverrideSet)
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# , modifier : Defaulted
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# , returnShellEnv : Defaulted
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# , withHoogle : Defaulted
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# , cabal2nixOptions : Defaulted
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# } -> NixShellAwareDerivation
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#
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# Given a path to a haskell package directory, an optional package name
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# which defaults to the base name of the path, an optional set of source
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# overrides as appropriate for the 'packageSourceOverrides' function, an
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# optional set of arbitrary overrides, and an optional haskell package
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# modifier, return a derivation appropriate for nix-build or nix-shell to
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# build that package.
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#
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# If 'returnShellEnv' is true this returns a derivation which will give you
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# an environment suitable for developing the listed packages with an
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# incremental tool like cabal-install.
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#
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# If 'withHoogle' is true (the default if a shell environment is requested)
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# then 'ghcWithHoogle' is used to generate the derivation (instead of
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# 'ghcWithPackages'), see the documentation there for more information.
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#
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# 'cabal2nixOptions' can contain extra command line arguments to pass to
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# 'cabal2nix' when generating the package derivation, for example setting
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# a cabal flag with '--flag=myflag'.
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developPackage =
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{ root
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, name ? builtins.baseNameOf root
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, source-overrides ? {}
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, overrides ? self: super: {}
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, modifier ? drv: drv
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, returnShellEnv ? pkgs.lib.inNixShell
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, withHoogle ? returnShellEnv
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, cabal2nixOptions ? "" }:
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let drv =
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(extensible-self.extend
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(pkgs.lib.composeExtensions
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(self.packageSourceOverrides source-overrides)
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overrides))
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.callCabal2nixWithOptions name root cabal2nixOptions {};
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in if returnShellEnv
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then (modifier drv).envFunc {inherit withHoogle;}
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else modifier drv;
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ghcWithPackages = selectFrom: withPackages (selectFrom self);
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# Put 'hoogle' into the derivation's PATH with a database containing all
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# the package's dependencies; run 'hoogle server --local' in a shell to
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# host a search engine for the dependencies.
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#
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# To reload the Hoogle server automatically on .cabal file changes try
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# this:
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# echo *.cabal | entr -r -- nix-shell --run 'hoogle server --local'
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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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# Returns a derivation whose environment contains a GHC with only
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# the dependencies of packages listed in `packages`, not the
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# packages themselves. Using nix-shell on this derivation will
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# give you an environment suitable for developing the listed
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# packages with an incremental tool like cabal-install.
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#
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# In addition to the "packages" arg and "withHoogle" arg, anything that
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# can be passed into stdenv.mkDerivation can be included in the input attrset
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#
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# # default.nix
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# with import <nixpkgs> {};
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# haskellPackages.extend (haskell.lib.packageSourceOverrides {
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# frontend = ./frontend;
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# backend = ./backend;
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# common = ./common;
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# })
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#
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# # shell.nix
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# let pkgs = import <nixpkgs> {} in
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# (import ./.).shellFor {
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# packages = p: [p.frontend p.backend p.common];
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# withHoogle = true;
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# buildInputs = [ pkgs.python pkgs.cabal-install ];
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# }
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#
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# -- cabal.project
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# packages:
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# frontend/
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# backend/
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# common/
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#
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# bash$ nix-shell --run "cabal new-build all"
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# bash$ nix-shell --run "python"
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shellFor =
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{ # Packages to create this development shell for. These are usually
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# your local packages.
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packages
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, # Whether or not to generate a Hoogle database for all the
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# dependencies.
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withHoogle ? false
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, # Whether or not to include benchmark dependencies of your local
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# packages. You should set this to true if you have benchmarks defined
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# in your local packages that you want to be able to run with cabal benchmark
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doBenchmark ? false
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, ...
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} @ args:
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let
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# A list of the packages we want to build a development shell for.
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# This is a list of Haskell package derivations.
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selected = packages self;
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# This is a list of attribute sets, where each attribute set
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# corresponds to the build inputs of one of the packages input to shellFor.
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#
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# Each attribute has keys like buildDepends, executableHaskellDepends,
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# testPkgconfigDepends, etc. The values for the keys of the attribute
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# set are lists of dependencies.
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#
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# Example:
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# cabalDepsForSelected
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# => [
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# # This may be the attribute set corresponding to the `backend`
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# # package in the example above.
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# { buildDepends = [ gcc ... ];
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# libraryHaskellDepends = [ lens conduit ... ];
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# ...
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# }
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# # This may be the attribute set corresponding to the `common`
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# # package in the example above.
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# { testHaskellDepends = [ tasty hspec ... ];
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# libraryHaskellDepends = [ lens aeson ];
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# benchmarkHaskellDepends = [ criterion ... ];
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# ...
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# }
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# ...
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# ]
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cabalDepsForSelected = map (p: p.getCabalDeps) selected;
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# A predicate that takes a derivation as input, and tests whether it is
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# the same as any of the `selected` packages.
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#
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# Returns true if the input derivation is not in the list of `selected`
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# packages.
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#
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# isNotSelected :: Derivation -> Bool
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#
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# Example:
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#
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# isNotSelected common [ frontend backend common ]
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# => false
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#
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# isNotSelected lens [ frontend backend common ]
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# => true
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isNotSelected = input: pkgs.lib.all (p: input.outPath or null != p.outPath) selected;
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# A function that takes a list of list of derivations, filters out all
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# the `selected` packages from each list, and concats the results.
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#
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# zipperCombinedPkgs :: [[Derivation]] -> [Derivation]
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#
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# Example:
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# zipperCombinedPkgs [ [ lens conduit ] [ aeson frontend ] ]
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# => [ lens conduit aeson ]
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#
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# Note: The reason this isn't just the function `pkgs.lib.concat` is
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# that we need to be careful to remove dependencies that are in the
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# `selected` packages.
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#
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# For instance, in the above example, if `common` is a dependency of
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# `backend`, then zipperCombinedPkgs needs to be careful to filter out
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# `common`, because cabal will end up ignoring that built version,
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# assuming new-style commands.
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zipperCombinedPkgs = vals:
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pkgs.lib.concatMap
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(drvList: pkgs.lib.filter isNotSelected drvList)
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vals;
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# Zip `cabalDepsForSelected` into a single attribute list, combining
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# the derivations in all the individual attributes.
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#
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# Example:
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# packageInputs
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# => # Assuming the value of cabalDepsForSelected is the same as
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# # the example in cabalDepsForSelected:
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# { buildDepends = [ gcc ... ];
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# libraryHaskellDepends = [ lens conduit aeson ... ];
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# testHaskellDepends = [ tasty hspec ... ];
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# benchmarkHaskellDepends = [ criterion ... ];
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# ...
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# }
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#
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# See the Note in `zipperCombinedPkgs` for what gets filtered out from
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# each of these dependency lists.
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packageInputs =
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pkgs.lib.zipAttrsWith (_name: zipperCombinedPkgs) cabalDepsForSelected;
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# A attribute set to pass to `haskellPackages.mkDerivation`.
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#
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# The important thing to note here is that all the fields from
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# packageInputs are set correctly.
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genericBuilderArgs = {
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pname =
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if pkgs.lib.length selected == 1
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then (pkgs.lib.head selected).name
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else "packages";
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version = "0";
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license = null;
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}
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// packageInputs
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// pkgs.lib.optionalAttrs doBenchmark {
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# `doBenchmark` needs to explicitly be set here because haskellPackages.mkDerivation defaults it to `false`. If the user wants benchmark dependencies included in their development shell, it has to be explicitly enabled here.
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doBenchmark = true;
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};
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# This is a pseudo Haskell package derivation that contains all the
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# dependencies for the packages in `selected`.
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#
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# This is a derivation created with `haskellPackages.mkDerivation`.
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#
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# pkgWithCombinedDeps :: HaskellDerivation
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pkgWithCombinedDeps = self.mkDerivation genericBuilderArgs;
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# The derivation returned from `envFunc` for `pkgWithCombinedDeps`.
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#
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# This is a derivation that can be run with `nix-shell`. It provides a
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# GHC with a package database with all the dependencies of our
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# `selected` packages.
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#
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# This is a derivation created with `stdenv.mkDerivation` (not
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# `haskellPackages.mkDerivation`).
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#
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# pkgWithCombinedDepsDevDrv :: Derivation
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pkgWithCombinedDepsDevDrv = pkgWithCombinedDeps.envFunc { inherit withHoogle; };
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mkDerivationArgs = builtins.removeAttrs args [ "packages" "withHoogle" "doBenchmark" ];
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in pkgWithCombinedDepsDevDrv.overrideAttrs (old: mkDerivationArgs // {
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nativeBuildInputs = old.nativeBuildInputs ++ mkDerivationArgs.nativeBuildInputs or [];
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buildInputs = old.buildInputs ++ mkDerivationArgs.buildInputs or [];
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});
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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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