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https://github.com/ilyakooo0/haskell.nix.git
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a045d79264
After investigating adding a project argument to override the mapping of libs to packages we realised we could fix the X11 package by updating `modules/configuration-nix.nix`. We also updated `system-nixpkgs-map.nix` to allow multiple packages to be mapped for a single library (turned out not to be necessary for X11). Co-authored-by: Rodney Lorrimar <rodney.lorrimar@iohk.io> Co-authored-by: Hamish Mackenzie <Hamish.Mackenzie@iohk.io>
107 lines
4.2 KiB
Nix
107 lines
4.2 KiB
Nix
let f = { hackage, pkgs, pkg-def, pkg-def-extras ? [], modules ? [] }: let
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buildModules = f { inherit hackage pkg-def pkg-def-extras modules; pkgs = pkgs.buildPackages; };
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in pkgs.lib.evalModules {
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modules = modules ++ [
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({ config, lib, ... }: {
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# Provide all modules with haskellLib, pkgs, and pkgconfPkgs arguments
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_module.args = {
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# this is *not* the hasekllLib from nixpkgs; it is rather our own
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# library from haskell.nix
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haskellLib = let hl = import ./lib { inherit pkgs lib; inherit (pkgs) stdenv recurseIntoAttrs srcOnly; haskellLib = hl; }; in hl;
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# The package descriptions depend on pkgs, which are used to resolve system package dependencies
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# as well as pkgconfPkgs, which are used to resolve pkgconfig name to nixpkgs names. We simply
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# augment the existing pkgs set with the specific mappings:
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pkgs = import ./lib/system-pkgs.nix pkgs;
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pkgconfPkgs = import ./lib/pkgconf-nixpkgs-map.nix pkgs;
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inherit buildModules;
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};
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# Set the hackage DB for modules/hackage.nix
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hackage.db = hackage;
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# Set the plan for modules/plan.nix
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plan.pkg-def = hackage: with builtins;
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# pkg-def's may reference boot packages, but those
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# are not guaranteed to be available on hackage, as
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# it is a manual process. They might eventually show
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# up much later on hackage; but are not installable
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# anyway. Therefore we just strip them out of the
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# pkg-def's packages.
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#
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# Note: these will need to be provided by alternative
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# means outside of hackage.
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let strip-pkg-def = pkg-def: hackage:
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lib.mapAttrs (k: v: if k == "packages"
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then lib.filterAttrs (k: _: !(builtins.elem k config.bootPkgs)) v
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else v)
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(pkg-def hackage);
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in let pkg-def' = strip-pkg-def pkg-def;
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# The desugar reason.
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#
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# it is quite cumbersome to write
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# (hackage: { packages.x.revision = hackage...;
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# packages.y.revision = import ./foo.nix; })
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# where we'd rather write:
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# (hackage: { x = hackage...; })
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# or
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# { y = ./foo.nix; }
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# As such the desugarer desugars this short hand syntax.
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in let desugar = extras:
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let
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isPath = x: builtins.typeOf x == "path";
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# rewrite
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# { ... }
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# into
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# { package = { ... }; }
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inject-packages = o: if o ? "packages" then o else { packages = o; };
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# rewrite
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# x = pkg;
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# into
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# x.revision = pkg;
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inject-revision = pkg: if pkg ? "revision" then pkg else { revision = pkg; };
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# rewrite
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# x.revision = ./some/path;
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# into
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# x.revision = import ./some/path;
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expand-paths = pkg: if !(isPath pkg.revision) then pkg else { revision = import pkg.revision; };
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# apply injection and expansion to the "packages" in extras.
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in lib.mapAttrs (k: v: if k != "packages"
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then v
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else lib.mapAttrs (_: pkg: (expand-paths (inject-revision pkg))) v)
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(inject-packages extras);
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# fold any potential `pkg-def-extras`
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# onto the `pkg-def`.
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#
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# This means you can have a base definition (e.g. stackage)
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# and augment it with custom packages to your liking.
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in foldl' lib.recursiveUpdate
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(pkg-def' hackage)
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(map (p: desugar (if builtins.isFunction p then p hackage else p)) pkg-def-extras)
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;
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})
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# Error handlers
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./modules/error-handler.nix
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# Supplies metadata
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./modules/cabal.nix
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# Converts config.packages into config.hsPkgs
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# Replace this with compat-driver.nix to use nixpkgs haskell build infra
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./modules/component-driver.nix
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# Converts config.hackage.db to config.hackage.configs
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./modules/hackage.nix
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# Converts config.hackage.configs and pkg-def to config.packages
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./modules/plan.nix
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# Configuration that applies to all plans
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./modules/configuration-nix.nix
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];
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};
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in f
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