Allow use of lix from nixpkgs

Change behaviour of module. Allow not specifying LixSrc
and provide fallback to nixpkgs.pkgs.lix

flake.lock

@@ -36,11 +36,11 @@
     "lix": {
       "flake": false,
       "locked": {
-        "lastModified": 1714969435,
-        "narHash": "sha256-HNIT8NiSZ1qrQMQT69Cr1nIhxrIIqHNPqLlmsVdcl18=",
-        "rev": "106b95904304e498cc6c72aace705441768ab240",
+        "lastModified": 1718767907,
+        "narHash": "sha256-gpd+mGQxqVHw2kO6rSPQel8TkChHh9UpqxjsmQi0QJM=",
+        "rev": "85f282ef572577899b3d80ba8def1b920a386218",
         "type": "tarball",
-        "url": "https://git.lix.systems/api/v1/repos/lix-project/lix/archive/106b95904304e498cc6c72aace705441768ab240.tar.gz"
+        "url": "https://git.lix.systems/api/v1/repos/lix-project/lix/archive/85f282ef572577899b3d80ba8def1b920a386218.tar.gz"
       },
       "original": {
         "type": "tarball",
@@ -49,11 +49,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1714906307,
-        "narHash": "sha256-UlRZtrCnhPFSJlDQE7M0eyhgvuuHBTe1eJ9N9AQlJQ0=",
+        "lastModified": 1718530797,
+        "narHash": "sha256-pup6cYwtgvzDpvpSCFh1TEUjw2zkNpk8iolbKnyFmmU=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "25865a40d14b3f9cf19f19b924e2ab4069b09588",
+        "rev": "b60ebf54c15553b393d144357375ea956f89e9a9",
         "type": "github"
       },
       "original": {

flake.nix

@@ -8,7 +8,7 @@
   inputs.flakey-profile.url = "github:lf-/flakey-profile";
 
   outputs = inputs@{ self, nixpkgs, lix, flake-utils, flakey-profile, ... }:
-    let versionSuffix = "pre${builtins.substring 0 8 lix.lastModifiedDate}-${lix.shortRev}";
+    let versionSuffix = "pre${builtins.substring 0 8 lix.lastModifiedDate}-${lix.shortRev or lix.dirtyShortRev}";
     in {
       inherit inputs;
       nixosModules.default = import ./module.nix { inherit lix versionSuffix; };

module.nix

@@ -1,5 +1,5 @@
-{ lix, versionSuffix ? "" }:
+{ lixSrc ? null, versionSuffix ? "" }:
 { pkgs, config, ... }:
 {
-  nixpkgs.overlays = [ (import ./overlay.nix { inherit lix versionSuffix; }) ];
+  nixpkgs.overlays = [ (import ./overlay.nix { inherit lixSrc versionSuffix; }) ];
 }

overlay.nix

@@ -1,36 +1,25 @@
-{ lix, versionSuffix ? "" }:
+{ lixSrc ? null, versionSuffix ? "" }:
 final: prev:
 let
-  boehmgc-patched = ((final.boehmgc.override {
-    enableLargeConfig = true;
-  }).overrideAttrs (o: {
-    # cherrypick: boehmgc: disable tests on aarch64-linux
-    # https://github.com/NixOS/nixpkgs/pull/309418
-    doCheck = !((final.stdenv.isDarwin && final.stdenv.isx86_64) || (final.stdenv.isLinux && final.stdenv.isAarch64));
-
-    patches = (o.patches or [ ]) ++ [
-      # for clown reasons this version is newer than the one in lix, we should
-      # fix this and update our nixpkgs pin
-      (prev.path + "/pkgs/tools/package-management/nix/patches/boehmgc-coroutine-sp-fallback.patch")
-    ] ++ final.lib.optionals (final.lib.versionOlder o.version "8.2.6") [
-      # https://github.com/ivmai/bdwgc/pull/586
-      (builtins.path { path = lix + "/boehmgc-traceable_allocator-public.diff"; name = "boehmgc-traceable_allocator-public.patch"; })
-    ];
-  })
-  );
-
   # 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
-  lixPkg = (final.callPackage (lix + "/package.nix") {
-    versionSuffix = "-lix${versionSuffix}";
-    boehmgc-nix = boehmgc-patched;
-  });
+  lixPkg =
+    if lixSrc == null
+    then prev.pkgs.lix
+    else
+      final.callPackage (lixSrc + "/package.nix") ({
+        versionSuffix = "-${versionSuffix}";
+        # FIXME: do this more sensibly for future releases
+        # https://git.lix.systems/lix-project/lix/issues/406
+        officialRelease = false;
+      });
 
   # These packages depend on Nix features that Lix does not support
   overridelist_2_18 = [
     "attic-client"
+    "devenv"
     "nix-du"
     "nix-init"
     "nix-prefetch-git"
@@ -43,43 +32,60 @@ let
       nix = final.nixVersions.nix_2_18_upstream;
     });
 
-  inherit (prev) lib;
+  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.
+  '';
 
-  prefetch-npm-deps-args = lib.functionArgs prev.prefetch-npm-deps.override;
-in
-override_2_18 //
-{
-  # 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;
+  maybeWarnDuplicate = x: if final.lix-overlay-present > 1 then builtins.trace warning x else x;
 
-  nixVersions = prev.nixVersions // rec {
-    # FIXME: do something less scuffed
-    nix_2_18 = lixPkg;
-    stable = nix_2_18;
-    nix_2_18_upstream = prev.nixVersions.nix_2_18;
+  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;
+
+    nixVersions = prev.nixVersions // rec {
+      # FIXME: do something less scuffed
+      nix_2_18 = maybeWarnDuplicate lixPkg;
+      stable = nix_2_18;
+      nix_2_18_upstream = prev.nixVersions.nix_2_18;
+    };
+
+    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 {
+        version = "2.90.0-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; };
+
+    pegtl = prev.callPackage ./pegtl.nix { };
   };
-
-  nix-eval-jobs = (prev.nix-eval-jobs.override {
-    # lix
-    nix = final.nixVersions.nix_2_18;
-  }).overrideAttrs (old: {
-    # FIXME: should this be patches instead?
-    src = final.lix-sources.nix-eval-jobs;
-
-    mesonBuildType = "debugoptimized";
-
-    ninjaFlags = old.ninjaFlags or [ ] ++ [ "-v" ];
-  });
-
-  # support both having and missing https://github.com/NixOS/nixpkgs/pull/304913
-  prefetch-npm-deps =
-    if (prefetch-npm-deps-args ? nix) || (prefetch-npm-deps-args == {})
-    then prev.prefetch-npm-deps.override {
-      nix = final.nixVersions.nix_2_18_upstream;
-    }
-    else prev.prefetch-npm-deps;
-
-  nix-doc = prev.callPackage ./nix-doc/package.nix { withPlugin = false; };
-}
+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

pegtl.nix

@@ -0,0 +1,23 @@
+{
+  stdenv,
+  cmake,
+  ninja,
+  fetchFromGitHub,
+}:
+
+stdenv.mkDerivation {
+  pname = "pegtl";
+  version = "3.2.7";
+
+  src = fetchFromGitHub {
+    repo = "PEGTL";
+    owner = "taocpp";
+    rev = "refs/tags/3.2.7";
+    hash = "sha256-IV5YNGE4EWVrmg2Sia/rcU8jCuiBynQGJM6n3DCWTQU=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+    ninja
+  ];
+}

pins.json

@@ -1 +1 @@
-{"nix-eval-jobs": {"kind": "tarball", "rev": "02bcbe0c0eb829cc268e9f5c595047f609da9693", "nar_hash": "sha256-v0uj3ZbpSQYz84YGkadDXCZjHBk2xJwHBLY3pkdPrvY=", "locked_url": "https://git.lix.systems/api/v1/repos/lix-project/nix-eval-jobs/archive/02bcbe0c0eb829cc268e9f5c595047f609da9693.tar.gz?rev=02bcbe0c0eb829cc268e9f5c595047f609da9693", "url": "https://git.lix.systems/lix-project/nix-eval-jobs/archive/main.tar.gz"}}
+{"nix-eval-jobs": {"kind": "tarball", "rev": "f8869bdcca7c1d5aaf37de3da3a4176811279a57", "nar_hash": "sha256-F/RvI9chHywnckEqHO1ggjzCayknhDnnl2kNnnVXpWg=", "locked_url": "https://git.lix.systems/api/v1/repos/lix-project/nix-eval-jobs/archive/f8869bdcca7c1d5aaf37de3da3a4176811279a57.tar.gz?rev=f8869bdcca7c1d5aaf37de3da3a4176811279a57", "url": "https://git.lix.systems/lix-project/nix-eval-jobs/archive/main.tar.gz"}}

pins.nix

@@ -14,11 +14,13 @@ let
           narHash = args.nar_hash;
         }
     else if kind == "tarball" then
-      builtins.fetchTarball
-        {
+      args // {
+        outPath = builtins.fetchTarball {
           name = "source";
           url = args.locked_url;
           sha256 = args.nar_hash;
-        } else builtins.throw "unsupported input type ${kind}";
+        };
+      }
+    else builtins.throw "unsupported input type ${kind}";
 in
 builtins.mapAttrs (_: fetchPin) pins

test-nixos.nix

@@ -2,6 +2,7 @@
 let
   configs = {
     it-builds = nixos ({ ... }: {
+      imports = [ lix-module ];
       documentation.enable = false;
       fileSystems."/".device = "ignore-root-device";
       boot.loader.grub.enable = false;