forked from lix-project/nixos-module
106 lines
4.1 KiB
Nix
106 lines
4.1 KiB
Nix
{ lix, versionSuffix ? "" }:
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final: prev:
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let
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# This is kind of scary to not override the nix version to pretend to be
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# 2.18 since nixpkgs can introduce new breakage in its Nix unstable CLI
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# usage.
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# https://github.com/nixos/nixpkgs/blob/6afb255d976f85f3359e4929abd6f5149c323a02/nixos/modules/config/nix.nix#L121
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lixPackageFromSource = final.callPackage (lix + "/package.nix") ({
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inherit versionSuffix;
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});
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# These packages depend on Nix features that Lix does not support
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overridelist_2_18 = [
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"attic-client"
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"devenv"
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"nix-du"
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"nix-init"
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"nix-prefetch-git"
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"nixos-option"
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"nurl"
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"prefetch-yarn-deps" # force these onto upstream so we are not regularly rebuilding electron
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];
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override_2_18 = prev.lib.genAttrs overridelist_2_18 (
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name: prev.${name}.override {
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nix = final.nixVersions.nix_2_18_upstream;
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}
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);
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inherit (prev) lib;
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csi = builtins.fromJSON ''"\u001b"'';
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orange = "${csi}[35;1m";
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normal = "${csi}[0m";
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warning = ''
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${orange}warning${normal}: You have the lix overlay included into a nixpkgs import twice,
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perhaps due to the NixOS module being included twice, or because of using
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pkgs.nixos and also including it in imports, or perhaps some unknown
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machinations of a complicated flake library.
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This is completely harmless since we have no-op'd the second one if you are
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seeing this message, but it would be a small style improvement to fix
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it :)
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P.S. If you had some hack to fix nixos-option build failures in your
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configuration, that was caused by including an older version of the lix
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overlay twice, which is now mitigated if you see this message, so you can
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delete that.
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P.P.S. This Lix has super catgirl powers.
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'';
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wrongMajorWarning = ''
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${orange}warning${normal}: This Lix NixOS module is being built against a Lix with a
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major version (got ${lixPackageToUse.version}) other than the one the
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module was designed for (expecting ${supportedLixMajor}). Some downstream
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packages like nix-eval-jobs may be broken by this. Consider using a
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matching version of the Lix NixOS module to the version of Lix you are
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using.
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'';
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maybeWarnDuplicate = x: if final.lix-overlay-present > 1 then builtins.trace warning x else x;
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versionJson = builtins.fromJSON (builtins.readFile ./version.json);
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supportedLixMajor = lib.versions.majorMinor versionJson.version;
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lixPackageToUse = if lix != null then lixPackageFromSource else prev.lix;
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# Especially if using Lix from nixpkgs, it is plausible that the overlay
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# could be used against the wrong Lix major version and cause confusing build
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# errors. This is a simple safeguard to put in at least something that might be seen.
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maybeWarnWrongMajor = x: if !(lib.hasPrefix supportedLixMajor lixPackageToUse.version) then builtins.trace wrongMajorWarning x else x;
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overlay = override_2_18 // {
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lix-overlay-present = 1;
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# used for things that one wouldn't necessarily want to update, but we
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# nevertheless shove it in the overlay and fixed-point it in case one *does*
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# want to do that.
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lix-sources = import ./pins.nix;
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lix = maybeWarnWrongMajor (maybeWarnDuplicate lixPackageToUse);
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nixVersions = prev.nixVersions // rec {
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nix_2_18 = final.lix;
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stable = nix_2_18;
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nix_2_18_upstream = prev.nixVersions.nix_2_18;
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};
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nix-eval-jobs = (prev.nix-eval-jobs.override {
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# lix
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nix = final.nixVersions.nix_2_18;
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}).overrideAttrs (old:
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let src = final.lix-sources.nix-eval-jobs;
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in {
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version = "2.92.0-lix-${builtins.substring 0 7 src.rev}";
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# FIXME: should this be patches instead?
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inherit src;
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mesonBuildType = "debugoptimized";
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ninjaFlags = old.ninjaFlags or [ ] ++ [ "-v" ];
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}
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);
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nix-doc = prev.callPackage ./nix-doc/package.nix { withPlugin = false; };
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};
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in
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# Make the overlay idempotent, since flakes passing nixos modules around by
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# value and many other things make it way too easy to include the overlay
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# twice
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if (prev ? lix-overlay-present) then { lix-overlay-present = 2; } else overlay
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