73 lines
2.8 KiB
Nix
73 lines
2.8 KiB
Nix
{
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inputs = {
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# user is expected to define this from their flake via `inputs.nixpkgs.follows = ...`
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nixpkgs = {};
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};
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outputs = { self, nixpkgs, variant ? "master" }@inputs:
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let
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patchedPkgsFor = system: nixpkgs.legacyPackages.${system}.applyPatches {
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name = "nixpkgs-patched-uninsane";
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version = nixpkgs.sourceInfo.lastModifiedDate;
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src = nixpkgs;
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patches = builtins.filter (p: p != null) (
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nixpkgs.legacyPackages."${system}".callPackage ./list.nix { } variant nixpkgs.lastModifiedDate
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);
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};
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patchedFlakeFor = system: import "${patchedPkgsFor system}/flake.nix";
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patchedFlakeOutputsFor = system: (patchedFlakeFor system).outputs {
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self = self // self._forSystem system;
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};
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extractBuildPlatform = nixosSystemArgs:
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builtins.foldl'
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(acc: mod: ((mod.nixpkgs or {}).buildPlatform or {}).system or acc)
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(nixosSystemArgs.system or null)
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(nixosSystemArgs.modules or []);
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in
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{
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# i attempt to mirror the non-patched nixpkgs flake outputs,
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# however the act of patching is dependent on the build system (can't be done in pure nix),
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# hence a 100% compatible interface has to be segmented by `system`:
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_forSystem = system: {
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inherit (patchedFlakeOutputsFor system) lib;
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legacyPackages = builtins.mapAttrs
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(system': _:
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(patchedFlakeOutputsFor (if system != null then system else system'))
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.legacyPackages."${system'}"
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)
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nixpkgs.legacyPackages;
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};
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# although i can't expose all of the patched nixpkgs outputs without knowing the `system` to use for patching,
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# several outputs learn about the system implicitly, so i can expose those:
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lib.nixosSystem = args: (
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self._forSystem (extractBuildPlatform args)
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).lib.nixosSystem args;
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legacyPackages = (self._forSystem null).legacyPackages;
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# sourceInfo includes fields (square brackets for the ones which are not always present):
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# - [dirtyRev]
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# - [dirtyShortRev]
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# - lastModified
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# - lastModifiedDate
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# - narHash
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# - outPath
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# - [rev]
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# - [revCount]
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# - [shortRev]
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# - submodules
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#
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# these values are used within nixpkgs:
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# - to give a friendly name to the nixos system (`readlink /run/current-system` -> `...nixos-system-desko-24.05.20240227.dirty`)
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# - to alias `import <nixpkgs>` so that nix uses the system's nixpkgs when called externally (supposedly).
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#
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# these values seem to exist both within the `sourceInfo` attrset and at the top-level.
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# for a list of all implicit flake outputs (which is what these seem to be):
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# $ nix-repl
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# > lf .
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# > <tab>
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inherit (nixpkgs) sourceInfo;
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} // nixpkgs.sourceInfo;
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}
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