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stdenv: fix crossSystem localSystem comparison #237427

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stdenv: fix crossSystem localSystem comparison #237427

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e5e5fd1
stdenv: fix crossSystem localSystem comparison
Artturin Jun 12, 2023
4e32b2a
treewide: use lib.systems.equals to compare systems
Artturin Jun 15, 2023
87c34c6
pkgs/top-level: Improve crossSystem equality early on
roberth Jun 16, 2023
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21 changes: 17 additions & 4 deletions pkgs/top-level/default.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -60,11 +60,24 @@ in let

localSystem = lib.systems.elaborate args.localSystem;

# Condition preserves sharing which in turn affects equality.
# Condition preserves sharing which in turn improves equality within this Nixpkgs.
#
# Use `lib.systems.equals` to compare systems.
crossSystem =
if crossSystem0 == null || crossSystem0 == args.localSystem
then localSystem
else lib.systems.elaborate crossSystem0;
if crossSystem0 == null || lib.systems.equals crossSystem0 args.localSystem
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@Artturin Artturin Jun 17, 2023 •
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https://gist.github.com/GrahamcOfBorg/1e800ef80702f76206b24b79c9f0dc1d

error: value is a string while a set was expected

crossSystem0 and args.localSystem haven't been elaborated so they're possibly just strings

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crossSystem0 and args.localSystem haven't been elaborated so they're possibly just strings

IMHO we should elaborate unconditionally here.

then
# This makes `crossSystem == localSystem` so that comparisons with `==`
# work **in the context of this single Nixpkgs invocation**.
#
# Equality is still broken when comparing between two Nixpkgs instances:
#
# (import <nixpkgs> {}).stdenv.hostPlatform
# != (import <nixpkgs> {}).stdenv.hostPlatform
localSystem
else
# It's a truly different system, so no significant equality problems.
# We only have to elaborate it, just like we did for localSystem above.
lib.systems.elaborate crossSystem0;

# Allow both:
# { /* the config */ } and
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