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Fix interaction between appendOverlays and otherPackageSets

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The comment

    a dirty hack that should be removed

has led me to believe that nixpkgsFun isn't the right solution,
but bypassing it is worse, because it creates a second, inner
overriding mechanism that doesn't pass its changes to the old,
outer overriding mechanism.

Before this change:

    nix-repl> ((import <nixpkgs> {}).appendOverlays([(f: s: { foobarbaz = "ok"; })])).foobarbaz
    "ok"

    nix-repl> ((import <nixpkgs> {}).appendOverlays([(f: s: { foobarbaz = "ok"; })])).pkgsCross.aarch64-multiplatform.foobarbaz
    error: attribute 'foobarbaz' missing

           at «string»:1:1:

                1| ((import <nixpkgs> {}).appendOverlays([(f: s: { foobarbaz = "ok"; })])).pkgsCross.aarch64-multiplatform.foobarbaz
                 | ^
                2|

After this change:

    nix-repl> ((import ./. {}).appendOverlays([(f: s: { foobarbaz = "ok"; })])).pkgsCross.aarch64-multiplatform.foobarbaz
    "ok"

Thanks to samueldr for discovering this problem.
This commit is contained in:
Robert Hensing 2021-08-31 09:15:44 +02:00
parent b5f2c5f132
commit eb8e943493
1 changed files with 2 additions and 2 deletions
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4
pkgs/top-level/stage.nix
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@ -15,7 +15,7 @@
# Utility functions, could just import but passing in for efficiency
lib
, # Use to reevaluate Nixpkgs; a dirty hack that should be removed
, # Use to reevaluate Nixpkgs
nixpkgsFun
## Other parameters
@ -218,7 +218,7 @@ let
appendOverlays = extraOverlays:
if extraOverlays == []
then self
else import ./stage.nix (args // { overlays = args.overlays ++ extraOverlays; });
else nixpkgsFun { overlays = args.overlays ++ extraOverlays; };
# NOTE: each call to extend causes a full nixpkgs rebuild, adding ~130MB
# of allocations. DO NOT USE THIS IN NIXPKGS.