nixos-module/overlay.nix

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{ lix ? null, versionSuffix ? "" }:
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final: prev:
let
# This is kind of scary to not override the nix version to pretend to be
# 2.18 since nixpkgs can introduce new breakage in its Nix unstable CLI
# usage.
# https://github.com/nixos/nixpkgs/blob/6afb255d976f85f3359e4929abd6f5149c323a02/nixos/modules/config/nix.nix#L121
lixPkgFromSource = final.callPackage (lix + "/package.nix") ({
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versionSuffix = "-${versionSuffix}";
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# FIXME: do this more sensibly for future releases
# https://git.lix.systems/lix-project/lix/issues/406
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officialRelease = false;
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});
# These packages depend on Nix features that Lix does not support
overridelist_2_18 = [
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"attic-client"
"devenv"
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"nix-du"
"nix-init"
"nix-prefetch-git"
"nixos-option"
"nurl"
"prefetch-yarn-deps" # force these onto upstream so we are not regularly rebuilding electron
];
override_2_18 = prev.lib.genAttrs overridelist_2_18 (
name: prev.${name}.override {
nix = final.nixVersions.nix_2_18_upstream;
});
warning = ''
warning: You have the lix overlay included into a nixpkgs import twice,
perhaps due to the NixOS module being included twice, or because of using
pkgs.nixos and also including it in imports, or perhaps some unknown
machinations of a complicated flake library.
This is completely harmless since we have no-op'd the second one if you are
seeing this message, but it would be a small style improvement to fix
it :)
P.S. If you had some hack to fix nixos-option build failures in your
configuration, that was caused by including an older version of the lix
overlay twice, which is now mitigated if you see this message, so you can
delete that.
P.P.S. This Lix has super catgirl powers.
'';
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maybeWarnDuplicate = x: if final.lix-overlay-present > 1 then builtins.trace warning x else x;
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overlay = override_2_18 // {
lix-overlay-present = 1;
# used for things that one wouldn't necessarily want to update, but we
# nevertheless shove it in the overlay and fixed-point it in case one *does*
# want to do that.
lix-sources = import ./pins.nix;
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lix = if lix != null then lixPkgFromSource else prev.lix;
nixVersions = prev.nixVersions // rec {
# FIXME: do something less scuffed
nix_2_18 = maybeWarnDuplicate final.lix;
stable = nix_2_18;
nix_2_18_upstream = prev.nixVersions.nix_2_18;
};
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nix-eval-jobs = (prev.nix-eval-jobs.override {
# lix
nix = final.nixVersions.nix_2_18;
}).overrideAttrs (old:
let src = final.lix-sources.nix-eval-jobs;
in {
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version = "2.91.0-lix-${builtins.substring 0 7 src.rev}";
# FIXME: should this be patches instead?
inherit src;
mesonBuildType = "debugoptimized";
ninjaFlags = old.ninjaFlags or [ ] ++ [ "-v" ];
}
);
nix-doc = prev.callPackage ./nix-doc/package.nix { withPlugin = false; };
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pegtl = prev.callPackage ./pegtl.nix { };
};
in
# Make the overlay idempotent, since flakes passing nixos modules around by
# value and many other things make it way too easy to include the overlay
# twice
if (prev ? lix-overlay-present) then { lix-overlay-present = 2; } else overlay