fix: make the boehm patch content addressed to avoid rebuilds

We don't intend to fix the API changes in nix-doc, because we should be
able to kill nix-doc in like a week?

default.nix

@@ -0,0 +1,10 @@
+(import
+  (
+    let lock = builtins.fromJSON (builtins.readFile ./flake.lock); in
+    fetchTarball {
+      url = lock.nodes.flake-compat.locked.url or "https://git.lix.systems/lix-project/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  { src = ./.; }
+).defaultNix

flake.lock

@@ -1,5 +1,20 @@
 {
   "nodes": {
+    "flake-compat": {
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "ref": "refs/heads/master",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "revCount": 57,
+        "type": "git",
+        "url": "ssh://git@git.lix.systems/lix-project/flake-compat"
+      },
+      "original": {
+        "type": "git",
+        "url": "ssh://git@git.lix.systems/lix-project/flake-compat"
+      }
+    },
     "flake-utils": {
       "inputs": {
         "systems": "systems"
@@ -19,18 +34,19 @@
       }
     },
     "lix": {
+      "flake": false,
       "locked": {
-        "lastModified": 1709811453,
-        "narHash": "sha256-UOyTAdUAJv80w3s6rrgYB5tQjp43u5Zp2dlM94uud04=",
+        "lastModified": 1710623569,
+        "narHash": "sha256-AUvlDCtq8ITFVHhy2SOboKSDC829LPciA/AAFD6zIyo=",
         "ref": "refs/heads/main",
-        "rev": "8a268359b06471b463a8f3fc46c83a1fced8ab75",
-        "revCount": 15077,
+        "rev": "11f35afa6f7933d1640e55473a8c7a153bf89b14",
+        "revCount": 15181,
         "type": "git",
-        "url": "ssh://gerrit.lix.systems:2022/lix"
+        "url": "ssh://git@git.lix.systems/lix-project/lix.git"
       },
       "original": {
         "type": "git",
-        "url": "ssh://gerrit.lix.systems:2022/lix"
+        "url": "ssh://git@git.lix.systems/lix-project/lix.git"
       }
     },
     "nixpkgs": {
@@ -51,6 +67,7 @@
     },
     "root": {
       "inputs": {
+        "flake-compat": "flake-compat",
         "flake-utils": "flake-utils",
         "lix": "lix",
         "nixpkgs": "nixpkgs"

flake.nix

@@ -1,13 +1,13 @@
 {
-  # fixme: use the forgejo address
   inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
   inputs.lix = {
-    url = "git+ssh://gerrit.lix.systems:2022/lix";
+    url = "git+ssh://git@git.lix.systems/lix-project/lix.git";
     flake = false;
   };
   inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.flake-compat.url = "git+ssh://git@git.lix.systems/lix-project/flake-compat";
 
-  outputs = { self, nixpkgs, lix, 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:

nix-doc/package.nix

@@ -0,0 +1,64 @@
+# Temporary replacement of the nix-doc package with
+# https://github.com/NixOS/nixpkgs/pull/296523 so that we can have working Lix
+# with nix-doc on 23.11 and 24.05-pre
+#
+# Can be removed when that commit is in 23.11 and 24.05-pre, or 24.05 is
+# released with the commit.
+{ lib
+, stdenv
+, rustPlatform
+, fetchFromGitHub
+, boost
+, nix
+, pkg-config
+# Whether to build the nix-doc plugin for Nix
+, withPlugin ? true
+}:
+
+let
+  packageFlags = [ "-p" "nix-doc" ] ++ lib.optionals withPlugin [ "-p" "nix-doc-plugin" ];
+in
+rustPlatform.buildRustPackage rec {
+  pname = "nix-doc";
+  version = "0.6.5";
+
+  src = fetchFromGitHub {
+    rev = "v${version}";
+    owner = "lf-";
+    repo = "nix-doc";
+    sha256 = "sha256-9cuNzq+CBA2jz0LkZb7lh/WISIlKklfovGBAbSo1Mgk=";
+  };
+
+  doCheck = true;
+  buildInputs = lib.optionals withPlugin [ boost nix ];
+
+  nativeBuildInputs = lib.optionals withPlugin [ pkg-config nix ];
+
+  cargoBuildFlags = packageFlags;
+  cargoTestFlags = packageFlags;
+
+  # Packaging support for making the nix-doc plugin load cleanly as a no-op on
+  # the wrong Nix version (disabling bindnow permits loading libraries
+  # requiring unavailable symbols if they are unreached)
+  hardeningDisable = lib.optionals withPlugin [ "bindnow" ];
+  # Due to a Rust bug, setting -Z relro-level to anything including "off" on
+  # macOS will cause link errors
+  env = lib.optionalAttrs (withPlugin && stdenv.isLinux) {
+    # nix-doc does not use nightly features, however, there is no other way to
+    # set relro-level
+    RUSTC_BOOTSTRAP = 1;
+    RUSTFLAGS = "-Z relro-level=partial";
+  };
+
+  cargoSha256 = "sha256-CHagzXTG9AfrFd3WmHanQ+YddMgmVxSuB8vK98A1Mlw=";
+
+  meta = with lib; {
+    description = "An interactive Nix documentation tool";
+    longDescription = "An interactive Nix documentation tool providing a CLI for function search, a Nix plugin for docs in the REPL, and a ctags implementation for Nix script";
+    homepage = "https://github.com/lf-/nix-doc";
+    license = licenses.lgpl3Plus;
+    maintainers = [ maintainers.lf- ];
+    platforms = platforms.unix;
+    mainProgram = "nix-doc";
+  };
+}

overlay.nix

@@ -10,7 +10,7 @@ let
       (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")
+      (builtins.path { path = lix + "/boehmgc-traceable_allocator-public.diff"; name = "boehmgc-traceable_allocator-public.patch"; })
     ];
   })
   );
@@ -20,10 +20,14 @@ in
     # FIXME: do something less scuffed
     nix_2_18 = (prev.nixVersions.nix_2_18.override { boehmgc = boehmgc-patched; }).overrideAttrs (old: {
       src = lix;
+      # FIXME: fake version so that nixpkgs will not try to use nix config >_>
       version = "2.18.3-lix";
       VERSION_SUFFIX = "-lix";
 
       patches = [ ];
+      # FIXME: we don't know why this was not being picked up properly when
+      # included in nativeCheckInputs.
+      nativeBuildInputs = old.nativeBuildInputs or [ ] ++ [ final.git ];
     });
     stable = nix_2_18;
     nix_2_18_upstream = prev.nixVersions.nix_2_18;
@@ -40,8 +44,9 @@ in
     nix = final.nixVersions.nix_2_18_upstream;
   };
 
-  nix-doc = prev.nix-doc.overrideAttrs (old: {
-    # for the purposes of nix C++ API for nix-doc, lix is Nix 2.20
-    NIX_CFLAGS_COMPILE = [ "-DNIX_2_20_0" ];
-  });
+  nixos-option = prev.nixos-option.override {
+    nix = final.nixVersions.nix_2_18_upstream;
+  };
+
+  nix-doc = prev.callPackage ./nix-doc/package.nix { withPlugin = false; };
 }