nixos module to catfood it

flake.lock

@@ -0,0 +1,130 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1709126324,
+        "narHash": "sha256-q6EQdSeUZOG26WelxqkmR7kArjgWCdw5sfJVHPH/7j8=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "d465f4819400de7c8d874d50b982301f28a84605",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "lix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-regression": "nixpkgs-regression"
+      },
+      "locked": {
+        "lastModified": 1709811453,
+        "narHash": "sha256-UOyTAdUAJv80w3s6rrgYB5tQjp43u5Zp2dlM94uud04=",
+        "ref": "refs/heads/main",
+        "rev": "8a268359b06471b463a8f3fc46c83a1fced8ab75",
+        "revCount": 15077,
+        "type": "git",
+        "url": "ssh://gerrit.lix.systems:2022/lix"
+      },
+      "original": {
+        "type": "git",
+        "url": "ssh://gerrit.lix.systems:2022/lix"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1704018918,
+        "narHash": "sha256-erjg/HrpC9liEfm7oLqb8GXCqsxaFwIIPqCsknW5aFY=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2c9c58e98243930f8cb70387934daa4bc8b00373",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05-small",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-regression": {
+      "locked": {
+        "lastModified": 1643052045,
+        "narHash": "sha256-uGJ0VXIhWKGXxkeNnq4TvV3CIOkUJ3PAoLZ3HMzNVMw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "215d4d0fd80ca5163643b03a33fde804a29cc1e2",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1709703039,
+        "narHash": "sha256-6hqgQ8OK6gsMu1VtcGKBxKQInRLHtzulDo9Z5jxHEFY=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "9df3e30ce24fd28c7b3e2de0d986769db5d6225d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "lix": "lix",
+        "nixpkgs": "nixpkgs_2"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,20 @@
+{
+  # fixme: use the forgejo address
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  inputs.lix.url = "git+ssh://gerrit.lix.systems:2022/lix";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, lix, flake-utils }: {
+    nixosModules.default = import ./module.nix { inherit lix; };
+    overlays.default = import ./overlay.nix { inherit lix; };
+  } // flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs {
+        inherit system;
+        overlays = [ self.overlays.default ];
+      };
+    in
+    {
+      packages.default = pkgs.nixVersions.nix_2_18;
+    });
+}

module.nix

@@ -0,0 +1,5 @@
+{ lix }:
+{ pkgs, config, ... }:
+{
+  nixpkgs.overlays = [ (import ./overlay.nix { inherit lix; }) ];
+}

overlay.nix

@@ -0,0 +1,28 @@
+{ lix }:
+final: prev:
+let
+  boehmgc-patched = ((final.boehmgc.override {
+    enableLargeConfig = true;
+  }).overrideAttrs (o: {
+    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")
+
+      # https://github.com/ivmai/bdwgc/pull/586
+      (lix + "/boehmgc-traceable_allocator-public.diff")
+    ];
+  })
+  );
+in
+{
+  nixVersions = prev.nixVersions // {
+    # FIXME: do something less scuffed
+    nix_2_18 = (prev.nixVersions.nix_2_18.override { boehmgc = boehmgc-patched; }).overrideAttrs (old: {
+      src = lix;
+      version = "2.18.3-lix";
+
+      patches = [ ];
+    });
+  };
+}