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easyOverlay: Support pkgs.system as a fallback

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This is required for `exportOverlays` in `digga`, which passes a fake
`pkgs` that doesn't have a `pkgs.stdenv`, but does have a `pkgs.system`.
This commit is contained in:
Robert Hensing 2023-01-04 20:10:09 +01:00
parent 836c38aa2a
commit 30bddfe65b
1 changed files with 6 additions and 1 deletions
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7
extras/easyOverlay.nix
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@ -44,7 +44,12 @@ in
config = {
flake.overlays.default = final: prev:
let
system = prev.stdenv.hostPlatform.system;
system =
prev.stdenv.hostPlatform.system or (
prev.system or (
throw "Could not determine the `hostPlatform` of Nixpkgs. Was this overlay loaded as a Nixpkgs overlay, or was it loaded into something else?"
)
);
perSys = (getSystem system).extendModules {
modules = [
{