flake.nix at fix-function-merge · tjh.dev/nixpkgs

tjh.dev / nixpkgs
Clone of https://github.com/NixOS/nixpkgs.git (to stress-test knotserver)
nixpkgs / flake.nix
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  1# Experimental flake interface to Nixpkgs.
  2# See https://github.com/NixOS/rfcs/pull/49 for details.
  3{
  4  description = "A collection of packages for the Nix package manager";
  5
  6  outputs = { self }:
  7    let
  8      libVersionInfoOverlay = import ./lib/flake-version-info.nix self;
  9      lib = (import ./lib).extend libVersionInfoOverlay;
 10
 11      forAllSystems = lib.genAttrs lib.systems.flakeExposed;
 12
 13      jobs = forAllSystems (system: import ./pkgs/top-level/release.nix {
 14        nixpkgs = self;
 15        inherit system;
 16      });
 17    in
 18    {
 19      lib = lib.extend (final: prev: {
 20
 21        nixos = import ./nixos/lib { lib = final; };
 22
 23        nixosSystem = args:
 24          import ./nixos/lib/eval-config.nix (
 25            {
 26              lib = final;
 27              # Allow system to be set modularly in nixpkgs.system.
 28              # We set it to null, to remove the "legacy" entrypoint's
 29              # non-hermetic default.
 30              system = null;
 31
 32              modules = args.modules ++ [
 33                # This module is injected here since it exposes the nixpkgs self-path in as
 34                # constrained of contexts as possible to avoid more things depending on it and
 35                # introducing unnecessary potential fragility to changes in flakes itself.
 36                #
 37                # See: failed attempt to make pkgs.path not copy when using flakes:
 38                # https://github.com/NixOS/nixpkgs/pull/153594#issuecomment-1023287913
 39                ({ config, pkgs, lib, ... }: {
 40                  config.nixpkgs.flake.source = self.outPath;
 41                })
 42              ];
 43            } // builtins.removeAttrs args [ "modules" ]
 44          );
 45      });
 46
 47      checks = forAllSystems (system: {
 48        tarball = jobs.${system}.tarball;
 49        # Exclude power64 due to "libressl is not available on the requested hostPlatform" with hostPlatform being power64
 50      } // lib.optionalAttrs (self.legacyPackages.${system}.stdenv.isLinux && !self.legacyPackages.${system}.targetPlatform.isPower64) {
 51        # Test that ensures that the nixosSystem function can accept a lib argument
 52        # Note: prefer not to extend or modify `lib`, especially if you want to share reusable modules
 53        #       alternatives include: `import` a file, or put a custom library in an option or in `_module.args.<libname>`
 54        nixosSystemAcceptsLib = (self.lib.nixosSystem {
 55          pkgs = self.legacyPackages.${system};
 56          lib = self.lib.extend (final: prev: {
 57            ifThisFunctionIsMissingTheTestFails = final.id;
 58          });
 59          modules = [
 60            ./nixos/modules/profiles/minimal.nix
 61            ({ lib, ... }: lib.ifThisFunctionIsMissingTheTestFails {
 62              # Define a minimal config without eval warnings
 63              nixpkgs.hostPlatform = "x86_64-linux";
 64              boot.loader.grub.enable = false;
 65              fileSystems."/".device = "nodev";
 66              # See https://search.nixos.org/options?show=system.stateVersion&query=stateversion
 67              system.stateVersion = lib.versions.majorMinor lib.version; # DON'T do this in real configs!
 68            })
 69          ];
 70        }).config.system.build.toplevel;
 71      });
 72
 73      htmlDocs = {
 74        nixpkgsManual = builtins.mapAttrs (_: jobSet: jobSet.manual) jobs;
 75        nixosManual = (import ./nixos/release-small.nix {
 76          nixpkgs = self;
 77        }).nixos.manual;
 78      };
 79
 80      # The "legacy" in `legacyPackages` doesn't imply that the packages exposed
 81      # through this attribute are "legacy" packages. Instead, `legacyPackages`
 82      # is used here as a substitute attribute name for `packages`. The problem
 83      # with `packages` is that it makes operations like `nix flake show
 84      # nixpkgs` unusably slow due to the sheer number of packages the Nix CLI
 85      # needs to evaluate. But when the Nix CLI sees a `legacyPackages`
 86      # attribute it displays `omitted` instead of evaluating all packages,
 87      # which keeps `nix flake show` on Nixpkgs reasonably fast, though less
 88      # information rich.
 89      legacyPackages = forAllSystems (system:
 90        (import ./. { inherit system; }).extend (final: prev: {
 91          lib = prev.lib.extend libVersionInfoOverlay;
 92        })
 93      );
 94
 95      nixosModules = {
 96        notDetected = ./nixos/modules/installer/scan/not-detected.nix;
 97
 98        /*
 99          Make the `nixpkgs.*` configuration read-only. Guarantees that `pkgs`
100          is the way you initialize it.
101
102          Example:
103
104              {
105                imports = [ nixpkgs.nixosModules.readOnlyPkgs ];
106                nixpkgs.pkgs = nixpkgs.legacyPackages.x86_64-linux;
107              }
108        */
109        readOnlyPkgs = ./nixos/modules/misc/nixpkgs/read-only.nix;
110      };
111    };
112}