132 lines
4.7 KiB
Nix
132 lines
4.7 KiB
Nix
/* This function composes the Nix Packages collection. It:
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1. Elaborates `localSystem` and `crossSystem` with defaults as needed.
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2. Applies the final stage to the given `config` if it is a function
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3. Defaults to no non-standard config and no cross-compilation target
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4. Uses the above to infer the default standard environment's (stdenv's)
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stages if no stdenv's are provided
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5. Folds the stages to yield the final fully booted package set for the
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chosen stdenv
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Use `impure.nix` to also infer the `system` based on the one on which
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evaluation is taking place, and the configuration from environment variables
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or dot-files. */
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{ # The system packages will be built on. See the manual for the
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# subtle division of labor between these two `*System`s and the three
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# `*Platform`s.
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localSystem
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, # The system packages will ultimately be run on.
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crossSystem ? localSystem
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, # Allow a configuration attribute set to be passed in as an argument.
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config ? {}
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, # List of overlays layers used to extend Nixpkgs.
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overlays ? []
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, # List of overlays to apply to target packages only.
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crossOverlays ? []
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, # A function booting the final package set for a specific standard
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# environment. See below for the arguments given to that function, the type of
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# list it returns.
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stdenvStages ? import ../stdenv
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, # Ignore unexpected args.
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...
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} @ args:
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let # Rename the function arguments
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config0 = config;
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crossSystem0 = crossSystem;
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in let
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lib = import ../../lib;
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inherit (lib) throwIfNot;
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checked =
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throwIfNot (lib.isList overlays) "The overlays argument to nixpkgs must be a list."
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lib.foldr (x: throwIfNot (lib.isFunction x) "All overlays passed to nixpkgs must be functions.") (r: r) overlays
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throwIfNot (lib.isList crossOverlays) "The crossOverlays argument to nixpkgs must be a list."
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lib.foldr (x: throwIfNot (lib.isFunction x) "All crossOverlays passed to nixpkgs must be functions.") (r: r) crossOverlays
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;
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localSystem = lib.systems.elaborate args.localSystem;
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# Condition preserves sharing which in turn affects equality.
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crossSystem =
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if crossSystem0 == null || crossSystem0 == args.localSystem
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then localSystem
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else lib.systems.elaborate crossSystem0;
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# Allow both:
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# { /* the config */ } and
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# { pkgs, ... } : { /* the config */ }
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config1 =
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if lib.isFunction config0
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then config0 { inherit pkgs; }
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else config0;
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configEval = lib.evalModules {
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modules = [
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./config.nix
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({ options, ... }: {
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_file = "nixpkgs.config";
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config = config1;
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})
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];
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};
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# take all the rest as-is
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config = lib.showWarnings configEval.config.warnings configEval.config;
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# A few packages make a new package set to draw their dependencies from.
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# (Currently to get a cross tool chain, or forced-i686 package.) Rather than
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# give `all-packages.nix` all the arguments to this function, even ones that
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# don't concern it, we give it this function to "re-call" nixpkgs, inheriting
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# whatever arguments it doesn't explicitly provide. This way,
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# `all-packages.nix` doesn't know more than it needs too.
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#
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# It's OK that `args` doesn't include default arguments from this file:
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# they'll be deterministically inferred. In fact we must *not* include them,
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# because it's important that if some parameter which affects the default is
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# substituted with a different argument, the default is re-inferred.
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#
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# To put this in concrete terms, this function is basically just used today to
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# use package for a different platform for the current platform (namely cross
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# compiling toolchains and 32-bit packages on x86_64). In both those cases we
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# want the provided non-native `localSystem` argument to affect the stdenv
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# chosen.
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#
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# NB!!! This thing gets its `config` argument from `args`, i.e. it's actually
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# `config0`. It is important to keep it to `config0` format (as opposed to the
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# result of `evalModules`, i.e. the `config` variable above) throughout all
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# nixpkgs evaluations since the above function `config0 -> config` implemented
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# via `evalModules` is not idempotent. In other words, if you add `config` to
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# `newArgs`, expect strange very hard to debug errors! (Yes, I'm speaking from
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# experience here.)
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nixpkgsFun = newArgs: import ./. (args // newArgs);
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# Partially apply some arguments for building bootstraping stage pkgs
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# sets. Only apply arguments which no stdenv would want to override.
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allPackages = newArgs: import ./stage.nix ({
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inherit lib nixpkgsFun;
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} // newArgs);
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boot = import ../stdenv/booter.nix { inherit lib allPackages; };
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stages = stdenvStages {
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inherit lib localSystem crossSystem config overlays crossOverlays;
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};
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pkgs = boot stages;
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in checked pkgs
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