mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-22 21:50:55 +00:00
11eddd61bc
This fixes both `nix-shell` failing to eval with `nixUnstable`, as well
as ofborg's failure to eval on aarch64 due to passing an "unexpected
arg" (1112e3a8c8/ofborg/src/nix.rs (L334-L340)).
129 lines
4.7 KiB
Nix
129 lines
4.7 KiB
Nix
/* This function composes the Nix Packages collection. It:
|
|
|
|
1. Applies the final stage to the given `config` if it is a function
|
|
|
|
2. Infers an appropriate `platform` based on the `system` if none is
|
|
provided
|
|
|
|
3. Defaults to no non-standard config and no cross-compilation target
|
|
|
|
4. Uses the above to infer the default standard environment's (stdenv's)
|
|
stages if no stdenv's are provided
|
|
|
|
5. Folds the stages to yield the final fully booted package set for the
|
|
chosen stdenv
|
|
|
|
Use `impure.nix` to also infer the `system` based on the one on which
|
|
evaluation is taking place, and the configuration from environment variables
|
|
or dot-files. */
|
|
|
|
{ # The system packages will be built on. See the manual for the
|
|
# subtle division of labor between these two `*System`s and the three
|
|
# `*Platform`s.
|
|
localSystem
|
|
|
|
, # The system packages will ultimately be run on.
|
|
crossSystem ? localSystem
|
|
|
|
, # Allow a configuration attribute set to be passed in as an argument.
|
|
config ? {}
|
|
|
|
, # List of overlays layers used to extend Nixpkgs.
|
|
overlays ? []
|
|
|
|
, # List of overlays to apply to target packages only.
|
|
crossOverlays ? []
|
|
|
|
, # A function booting the final package set for a specific standard
|
|
# environment. See below for the arguments given to that function, the type of
|
|
# list it returns.
|
|
stdenvStages ? import ../stdenv
|
|
|
|
, # Ignore unexpected args.
|
|
...
|
|
} @ args:
|
|
|
|
let # Rename the function arguments
|
|
config0 = config;
|
|
crossSystem0 = crossSystem;
|
|
|
|
in let
|
|
lib = import ../../lib;
|
|
|
|
# Allow both:
|
|
# { /* the config */ } and
|
|
# { pkgs, ... } : { /* the config */ }
|
|
config1 =
|
|
if lib.isFunction config0
|
|
then config0 { inherit pkgs; }
|
|
else config0;
|
|
|
|
# From a minimum of `system` or `config` (actually a target triple, *not*
|
|
# nixpkgs configuration), infer the other one and platform as needed.
|
|
localSystem = lib.systems.elaborate (if builtins.isAttrs args.localSystem then (
|
|
# Allow setting the platform in the config file. This take precedence over
|
|
# the inferred platform, but not over an explicitly passed-in one.
|
|
builtins.intersectAttrs { platform = null; } config1
|
|
// args.localSystem) else args.localSystem);
|
|
|
|
crossSystem = if crossSystem0 == null then localSystem
|
|
else lib.systems.elaborate crossSystem0;
|
|
|
|
configEval = lib.evalModules {
|
|
modules = [
|
|
./config.nix
|
|
({ options, ... }: {
|
|
_file = "nixpkgs.config";
|
|
# filter-out known options, FIXME: remove this eventually
|
|
config = builtins.intersectAttrs options config1;
|
|
})
|
|
];
|
|
};
|
|
|
|
# take all the rest as-is
|
|
config = lib.showWarnings configEval.config.warnings
|
|
(config1 // builtins.removeAttrs configEval.config [ "_module" ]);
|
|
|
|
# A few packages make a new package set to draw their dependencies from.
|
|
# (Currently to get a cross tool chain, or forced-i686 package.) Rather than
|
|
# give `all-packages.nix` all the arguments to this function, even ones that
|
|
# don't concern it, we give it this function to "re-call" nixpkgs, inheriting
|
|
# whatever arguments it doesn't explicitly provide. This way,
|
|
# `all-packages.nix` doesn't know more than it needs too.
|
|
#
|
|
# It's OK that `args` doesn't include default arguments from this file:
|
|
# they'll be deterministically inferred. In fact we must *not* include them,
|
|
# because it's important that if some parameter which affects the default is
|
|
# substituted with a different argument, the default is re-inferred.
|
|
#
|
|
# To put this in concrete terms, this function is basically just used today to
|
|
# use package for a different platform for the current platform (namely cross
|
|
# compiling toolchains and 32-bit packages on x86_64). In both those cases we
|
|
# want the provided non-native `localSystem` argument to affect the stdenv
|
|
# chosen.
|
|
#
|
|
# NB!!! This thing gets its `config` argument from `args`, i.e. it's actually
|
|
# `config0`. It is important to keep it to `config0` format (as opposed to the
|
|
# result of `evalModules`, i.e. the `config` variable above) throughout all
|
|
# nixpkgs evaluations since the above function `config0 -> config` implemented
|
|
# via `evalModules` is not idempotent. In other words, if you add `config` to
|
|
# `newArgs`, expect strange very hard to debug errors! (Yes, I'm speaking from
|
|
# experience here.)
|
|
nixpkgsFun = newArgs: import ./. (args // newArgs);
|
|
|
|
# Partially apply some arguments for building bootstraping stage pkgs
|
|
# sets. Only apply arguments which no stdenv would want to override.
|
|
allPackages = newArgs: import ./stage.nix ({
|
|
inherit lib nixpkgsFun;
|
|
} // newArgs);
|
|
|
|
boot = import ../stdenv/booter.nix { inherit lib allPackages; };
|
|
|
|
stages = stdenvStages {
|
|
inherit lib localSystem crossSystem config overlays crossOverlays;
|
|
};
|
|
|
|
pkgs = boot stages;
|
|
|
|
in pkgs
|