Commit b78a8c91 authored Jul 07, 2025 by Robert Hensing

flake.nix: Construct legacyPackages in one go

This saves the construction of an unused `pkgs` attrset and all that
is required to reach that, which is not a lot, but still significant.

Benchmark 1: nix eval .?ref=42608bc8e65c5bf596d6155ad2f0ded6253b1e69#hello.outPath --no-eval-cache
  Time (mean ± σ):      1.062 s ±  0.011 s    [User: 0.674 s, System: 0.226 s]
  Range (min … max):    1.040 s …  1.080 s    10 runs

Benchmark 2: nix eval .?ref=8a7e18b270cb2256a0526b9cda1d9e410aacd440#hello.outPath --no-eval-cache
  Time (mean ± σ):      1.317 s ±  0.033 s    [User: 0.835 s, System: 0.270 s]
  Range (min … max):    1.282 s …  1.371 s    10 runs

Summary
  nix eval .?ref=42608bc8e65c5bf596d6155ad2f0ded6253b1e69#hello.outPath --no-eval-cache ran
    1.24 ± 0.03 times faster than nix eval .?ref=8a7e18b270cb2256a0526b9cda1d9e410aacd440#hello.outPath --no-eval-cache

(where 42608bc had the same tree as this commit)

parent bd3d8592

flake.nix

+8 −5

Original line number	Diff line number	Diff line
		@@ -209,11 +209,14 @@
		*/
		legacyPackages = forAllSystems (
		system:
		(import ./. { inherit system; }).extend (
		final: prev: {
		(import ./. {
		inherit system;
		overlays = import ./pkgs/top-level/impure-overlays.nix ++ [
		(final: prev: {
		lib = prev.lib.extend libVersionInfoOverlay;
		}
		)
		})
		];
		})
		);

		/**