nixpkgs/pkgs/development/haskell-modules/make-package-set.nix

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# This expression takes a file like `hackage-packages.nix` and constructs
# a full package set out of that.
{ # package-set used for build tools (all of nixpkgs)
buildPackages
, # A haskell package set for Setup.hs, compiler plugins, and similar
# build-time uses.
buildHaskellPackages
, # package-set used for non-haskell dependencies (all of nixpkgs)
pkgs
, # stdenv to use for building haskell packages
stdenv
, haskellLib
, # hashes for downloading Hackage packages
all-cabal-hashes
, # compiler to use
ghc
, # A function that takes `{ pkgs, stdenv, callPackage }` as the first arg and
# `self` as second, and returns a set of haskell packages
package-set
, # The final, fully overriden package set usable with the nixpkgs fixpoint
# overriding functionality
extensible-self
}:
# return value: a function from self to the package set
self:
let
inherit (stdenv) buildPlatform hostPlatform;
inherit (stdenv.lib) fix' extends makeOverridable;
inherit (haskellLib) overrideCabal;
mkDerivationImpl = pkgs.callPackage ./generic-builder.nix {
inherit stdenv;
nodejs = buildPackages.nodejs-slim;
inherit buildHaskellPackages;
inherit (self) ghc;
inherit (buildHaskellPackages) jailbreak-cabal;
hscolour = overrideCabal buildHaskellPackages.hscolour (drv: {
isLibrary = false;
doHaddock = false;
hyperlinkSource = false; # Avoid depending on hscolour for this build.
postFixup = "rm -rf $out/lib $out/share $out/nix-support";
});
cpphs = overrideCabal (self.cpphs.overrideScope (self: super: {
mkDerivation = drv: super.mkDerivation (drv // {
enableSharedExecutables = false;
enableSharedLibraries = false;
doHaddock = false;
useCpphs = false;
});
})) (drv: {
isLibrary = false;
postFixup = "rm -rf $out/lib $out/share $out/nix-support";
});
};
mkDerivation = makeOverridable mkDerivationImpl;
# manualArgs are the arguments that were explictly passed to `callPackage`, like:
#
# callPackage foo { bar = null; };
#
# here `bar` is a manual argument.
callPackageWithScope = scope: fn: manualArgs:
let
# this code is copied from callPackage in lib/customisation.nix
#
# we cannot use `callPackage` here because we want to call `makeOverridable`
# on `drvScope` (we cannot add `overrideScope` after calling `callPackage` because then it is
# lost on `.override`) but determine the auto-args based on `drv` (the problem here
# is that nix has no way to "passthrough" args while preserving the reflection
# info that callPackage uses to determine the arguments).
drv = if stdenv.lib.isFunction fn then fn else import fn;
auto = builtins.intersectAttrs (stdenv.lib.functionArgs drv) scope;
# this wraps the `drv` function to add a `overrideScope` function to the result.
drvScope = allArgs: drv allArgs // {
overrideScope = f:
let newScope = mkScope (fix' (extends f scope.__unfix__));
# note that we have to be careful here: `allArgs` includes the auto-arguments that
# weren't manually specified. If we would just pass `allArgs` to the recursive call here,
# then we wouldn't look up any packages in the scope in the next interation, because it
# appears as if all arguments were already manually passed, so the scope change would do
# nothing.
in callPackageWithScope newScope drv manualArgs;
};
in stdenv.lib.makeOverridable drvScope (auto // manualArgs);
mkScope = scope: pkgs // pkgs.xorg // pkgs.gnome2 // { inherit stdenv; } // scope;
defaultScope = mkScope self;
callPackage = drv: args: callPackageWithScope defaultScope drv args;
withPackages = packages: buildPackages.callPackage ./with-packages-wrapper.nix {
inherit (self) llvmPackages;
inherit ghc;
inherit packages;
};
haskellSrc2nix = { name, src, sha256 ? null }:
let
sha256Arg = if isNull sha256 then "--sha256=" else ''--sha256="${sha256}"'';
in pkgs.buildPackages.stdenv.mkDerivation {
name = "cabal2nix-${name}";
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nativeBuildInputs = [ pkgs.buildPackages.cabal2nix ];
preferLocalBuild = true;
phases = ["installPhase"];
LANG = "en_US.UTF-8";
LOCALE_ARCHIVE = pkgs.lib.optionalString buildPlatform.isLinux "${buildPackages.glibcLocales}/lib/locale/locale-archive";
installPhase = ''
export HOME="$TMP"
mkdir -p "$out"
cabal2nix --compiler=${ghc.haskellCompilerName} --system=${stdenv.system} ${sha256Arg} "${src}" > "$out/default.nix"
'';
};
all-cabal-hashes-component = name: version: pkgs.runCommand "all-cabal-hashes-component-${name}-${version}" {} ''
tar --wildcards -xzvf ${all-cabal-hashes} \*/${name}/${version}/${name}.{json,cabal}
mkdir -p $out
mv */${name}/${version}/${name}.{json,cabal} $out
'';
hackage2nix = name: version: let component = all-cabal-hashes-component name version; in self.haskellSrc2nix {
name = "${name}-${version}";
sha256 = ''$(sed -e 's/.*"SHA256":"//' -e 's/".*$//' "${component}/${name}.json")'';
src = "${component}/${name}.cabal";
};
in package-set { inherit pkgs stdenv callPackage; } self // {
inherit mkDerivation callPackage haskellSrc2nix hackage2nix;
inherit (haskellLib) packageSourceOverrides;
callHackage = name: version: self.callPackage (self.hackage2nix name version);
# Creates a Haskell package from a source package by calling cabal2nix on the source.
callCabal2nix = name: src: args: let
filter = path: type:
pkgs.lib.hasSuffix "${name}.cabal" path ||
baseNameOf path == "package.yaml";
expr = haskellSrc2nix {
inherit name;
src = if pkgs.lib.canCleanSource src
then pkgs.lib.cleanSourceWith { inherit src filter; }
else src;
};
in overrideCabal (self.callPackage expr args) (orig: {
inherit src;
preConfigure =
"# Generated from ${expr}\n${orig.preConfigure or ""}";
});
# : { root : Path
# , source-overrides : Defaulted (Either Path VersionNumber)
# , overrides : Defaulted (HaskellPackageOverrideSet)
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# , modifier : Defaulted
# } -> NixShellAwareDerivation
# Given a path to a haskell package directory whose cabal file is
# named the same as the directory name, an optional set of
# source overrides as appropriate for the 'packageSourceOverrides'
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# function, an optional set of arbitrary overrides, and an optional
# haskell package modifier, return a derivation appropriate
# for nix-build or nix-shell to build that package.
developPackage = { root, source-overrides ? {}, overrides ? self: super: {}, modifier ? drv: drv }:
let name = builtins.baseNameOf root;
drv =
(extensible-self.extend (pkgs.lib.composeExtensions (self.packageSourceOverrides source-overrides) overrides)).callCabal2nix name root {};
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in if pkgs.lib.inNixShell then (modifier drv).env else modifier drv;
ghcWithPackages = selectFrom: withPackages (selectFrom self);
ghcWithHoogle = selectFrom:
let
packages = selectFrom self;
hoogle = callPackage ./hoogle.nix {
inherit packages;
};
in withPackages (packages ++ [ hoogle ]);
# Returns a derivation whose environment contains a GHC with only
# the dependencies of packages listed in `packages`, not the
# packages themselves. Using nix-shell on this derivation will
# give you an environment suitable for developing the listed
# packages with an incremental tool like cabal-install.
#
# # default.nix
# with import <nixpkgs> {};
# haskellPackages.extend (haskell.lib.packageSourceOverrides {
# frontend = ./frontend;
# backend = ./backend;
# common = ./common;
# })
#
# # shell.nix
# (import ./.).shellFor {
# packages = p: [p.frontend p.backend p.common];
# withHoogle = true;
# }
#
# -- cabal.project
# packages:
# frontend/
# backend/
# common/
#
# bash$ nix-shell --run "cabal new-build all"
shellFor = { packages, withHoogle ? false, ... } @ args:
let
selected = packages self;
packageInputs = builtins.map (p: p.override { mkDerivation = haskellLib.extractBuildInputs p.compiler; }) selected;
haskellInputs =
builtins.filter
(input: pkgs.lib.all (p: input.outPath != p.outPath) selected)
(pkgs.lib.concatMap (p: p.haskellBuildInputs) packageInputs);
systemInputs = pkgs.lib.concatMap (p: p.systemBuildInputs) packageInputs;
withPackages = if withHoogle then self.ghcWithHoogle else self.ghcWithPackages;
mkDrvArgs = builtins.removeAttrs args ["packages" "withHoogle"];
in pkgs.stdenv.mkDerivation (mkDrvArgs // {
name = "ghc-shell-for-packages";
nativeBuildInputs = [(withPackages (_: haskellInputs))] ++ mkDrvArgs.nativeBuildInputs or [];
buildInputs = systemInputs ++ mkDrvArgs.buildInputs or [];
phases = ["installPhase"];
installPhase = "echo $nativeBuildInputs $buildInputs > $out";
});
ghc = ghc // {
withPackages = self.ghcWithPackages;
withHoogle = self.ghcWithHoogle;
};
}