pyrox.dev
top-level: Simplify impure and pure fallback
This is now possible, since the `platform` attribute has been removed in
PR #107214. I've been waiting to do a cleanup like this for a long time!
+10
-14
pkgs/top-level/default.nix
+10
-14
pkgs/top-level/default.nix
···
1
/* This function composes the Nix Packages collection. It:
2
3
-
1. Applies the final stage to the given `config` if it is a function
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5
-
2. Infers an appropriate `platform` based on the `system` if none is
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-
provided
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3. Defaults to no non-standard config and no cross-compilation target
9
···
50
in let
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lib = import ../../lib;
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# Allow both:
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# { /* the config */ } and
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# { pkgs, ... } : { /* the config */ }
···
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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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-
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-
# From a minimum of `system` or `config` (actually a target triple, *not*
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-
# nixpkgs configuration), infer the other one and platform as needed.
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-
localSystem = lib.systems.elaborate (if builtins.isAttrs args.localSystem then (
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-
# Allow setting the platform in the config file. This take precedence over
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-
# the inferred platform, but not over an explicitly passed-in one.
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-
builtins.intersectAttrs { platform = null; } config1
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-
// args.localSystem) else args.localSystem);
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-
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-
crossSystem = if crossSystem0 == null then localSystem
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-
else lib.systems.elaborate crossSystem0;
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configEval = lib.evalModules {
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modules = [
···
1
/* This function composes the Nix Packages collection. It:
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3
+
1. Elaborates `localSystem` and `crossSystem` with defaults as needed.
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5
+
2. Applies the final stage to the given `config` if it is a function
6
7
3. Defaults to no non-standard config and no cross-compilation target
8
···
49
in let
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lib = import ../../lib;
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52
+
localSystem = lib.systems.elaborate args.localSystem;
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+
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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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+
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# Allow both:
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# { /* the config */ } and
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# { pkgs, ... } : { /* the config */ }
···
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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 = [
+14
-20
pkgs/top-level/impure.nix
+14
-20
pkgs/top-level/impure.nix
···
12
13
in
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15
-
{ # We combine legacy `system` and `platform` into `localSystem`, if
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-
# `localSystem` was not passed. Strictly speaking, this is pure desugar, but
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-
# it is most convient to do so before the impure `localSystem.system` default,
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-
# so we do it now.
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-
localSystem ? builtins.intersectAttrs { system = null; platform = null; } args
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-
, # These are needed only because nix's `--arg` command-line logic doesn't work
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-
# with unnamed parameters allowed by ...
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-
system ? localSystem.system
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-
, platform ? localSystem.platform
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-
, crossSystem ? null
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, # Fallback: The contents of the configuration file found at $NIXPKGS_CONFIG or
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# $HOME/.config/nixpkgs/config.nix.
···
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, ...
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} @ args:
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-
# If `localSystem` was explicitly passed, legacy `system` and `platform` should
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-
# not be passed.
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-
assert args ? localSystem -> !(args ? system || args ? platform);
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-
import ./. (builtins.removeAttrs args [ "system" "platform" ] // {
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-
inherit config overlays crossSystem crossOverlays;
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-
# Fallback: Assume we are building packages on the current (build, in GNU
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-
# Autotools parlance) system.
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-
localSystem = if builtins.isString localSystem then localSystem
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-
else (if args ? localSystem then {}
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-
else { system = builtins.currentSystem; }) // localSystem;
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})
···
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13
in
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15
+
{ # We put legacy `system` into `localSystem`, if `localSystem` was not passed.
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+
# If neither is passed, assume we are building packages on the current
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+
# (build, in GNU Autotools parlance) platform.
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+
localSystem ? { system = args.system or builtins.currentSystem; }
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+
# These are needed only because nix's `--arg` command-line logic doesn't work
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+
# with unnamed parameters allowed by ...
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+
, system ? localSystem.system
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+
, crossSystem ? localSystem
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25
, # Fallback: The contents of the configuration file found at $NIXPKGS_CONFIG or
26
# $HOME/.config/nixpkgs/config.nix.
···
75
, ...
76
} @ args:
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78
+
# If `localSystem` was explicitly passed, legacy `system` should
79
+
# not be passed, and vice-versa.
80
+
assert args ? localSystem -> !(args ? system);
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+
assert args ? system -> !(args ? localSystem);
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83
+
import ./. (builtins.removeAttrs args [ "system" ] // {
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+
inherit config overlays localSystem;
85
})