add user level version of crimes

flake.nix

@@ -109,7 +109,12 @@
                     };
 
                     possiblyCommitCrimes = lib.mkOption {
-                      description = "Globally enable usage of packages marked as FYPTL";
+                      description = ''
+                        Globally enable usage of packages marked as FYPTL. This installs a nix
+                        plugin, which is widely considered to be a nix crime, and it also might
+                        be an actual crime to use these packages depending on you jurisdiction. Use
+                        at your own risk
+                      '';
                       type = lib.types.bool;
                       default = false;
                       defaultText = lib.literalExpression "false";
@@ -134,32 +139,29 @@
                     self.meta.path-entry
                   ];
 
-                  # TODO: also enable this for user-level nix, somehow
                   config.nixpkgs.config = lib.mkIf config.dragnpkgs.possiblyCommitCrimes {
                     allowlistedLicenses = [ lib.licenses.fyptl ];
                   };
 
-                  config.nix.registry.dragnpkgs-global-config.to =
-                    let
-                      possiblyCommitCrimes =
-                        lib.boolToString config.dragnpkgs.possiblyCommitCrimes;
-                      config-flake = pkgs.writeTextFile {
-                        name = "source";
-                        destination = "/flake.nix";
-                        text = ''
-                          {
-                            outputs = { self }: {
-                              dragnpkgsConfig = {
+                  config.nix.settings.plugin-files =
+                    lib.optionals config.dragnpkgs.possiblyCommitCrimes [
+                      "${pkgs.lix-plugins}/lib/liblix-plugins.so"
+                    ];
+
+                  config.nix.settings.extra-builtins-file = 
+                    lib.mkIf config.dragnpkgs.possiblyCommitCrimes (
+                      lib.mkForce "/etc/nix/extra-builtins.nix"
+                    );
+
+                  config.environment.etc."nix/extra-builtins.nix".source =
+                    lib.mkIf config.dragnpkgs.possiblyCommitCrimes
+                    ''
+                      { ... }: {
+                        dragnpkgs = {
                           possiblyCommitCrimes = ${possiblyCommitCrimes};
                         };
-                            };
                       }
                     '';
-                      };
-                    in {
-                      type = "path";
-                      path = "${config-flake}";
-                    };
                 })
 
                 (import ./module.nix)
@@ -187,7 +189,32 @@
       });
 
       legacyPackages = forAllSystems (system:
-        nixpkgs.legacyPackages.${system}.appendOverlays overlays
+        let
+          unsafeConf = if builtins.hasAttr "extraBuiltins" builtins then (
+            let conf = builtins.extraBuiltins; in
+            if builtins.isAttrs conf then conf else {}
+          ) else {};
+          possiblyCommitCrimes =
+          if
+            builtins.hasAttr "dragnpkgs" unsafeConf &&
+            builtins.isAttrs unsafeConf.dragnpkgs &&
+            builtins.hasAttr "possiblyCommitCrimes" unsafeConf.dragnpkgs &&
+            builtins.isBool unsafeConf.dragnpkgs.possiblyCommitCrimes
+          then
+            unsafeConf.dragnpkgs.possiblyCommitCrimes
+          else
+            false;
+        in
+        nixpkgs.legacyPackages.${system}.appendOverlays (overlays ++
+          (final: prev: {
+            stdenv = prev.stdenv.override {
+              config = prev.config // {
+                allowlistedLicenses = final.lib.optionals
+                  possiblyCommitCrimes
+                  [ final.lib.licenses.fyptl ];
+              };
+            };
+          }))
       );
 
       nixosModules = nixpkgs.nixosModules;

overlay.nix

@@ -45,4 +45,7 @@ final: prev: {
   eta = prev.callPackage ./pkgs/cmdline/eta {};
 
   cado-nfs = prev.callPackage ./pkgs/crypto/cado-nfs {};
+
+  lix-plugins = prev.callPackage ./pkgs/lix/lix-plugins {};
+  nix-plugins = builtins.throw "nix-plugins is not supported. see pkgs.lix-plugins";
 }

pkgs/lix/lix-plugins/0001-implement-lix-support.patch

@@ -0,0 +1,142 @@
+From 72257e171df999f878a250495a77247a9c5da68b Mon Sep 17 00:00:00 2001
+From: xenia <xenia@awoo.systems>
+Date: Sat, 21 Dec 2024 15:33:10 -0500
+Subject: [PATCH] implement lix support
+
+---
+ CMakeLists.txt          | 27 ---------------------------
+ extra-builtins.cc       | 27 +++------------------------
+ meson.build             | 18 ++++++++++++++++++
+ nix-plugins-config.h.in |  3 ---
+ 4 files changed, 21 insertions(+), 54 deletions(-)
+ delete mode 100644 CMakeLists.txt
+ create mode 100644 meson.build
+ delete mode 100644 nix-plugins-config.h.in
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+deleted file mode 100644
+index 9674fe8..0000000
+--- a/CMakeLists.txt
++++ /dev/null
+@@ -1,27 +0,0 @@
+-cmake_minimum_required (VERSION 3.9)
+-project (nix-plugins)
+-set (nix-plugins_VERSION_MAJOR 15)
+-set (nix-plugins_VERSION_MINOR 0)
+-set (nix-plugins_VERSION_PATCH 0)
+-
+-find_package(PkgConfig)
+-
+-pkg_check_modules(NIX REQUIRED nix-expr>=2.24 nix-main>=2.24 nix-store>=2.24)
+-
+-find_path(BOOST_INCLUDE_DIR boost/format.hpp)
+-if(BOOST_INCLUDE_DIR STREQUAL "BOOST_INCLUDE_DIR-NOTFOUND")
+-  message(FATAL_ERROR "Could not find Boost formatting library.")
+-endif()
+-include_directories(${BOOST_INCLUDE_DIR})
+-
+-if(APPLE)
+-  set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -flat_namespace -undefined suppress")
+-endif()
+-
+-add_library(nix-extra-builtins MODULE extra-builtins.cc)
+-configure_file(nix-plugins-config.h.in nix-plugins-config.h)
+-target_include_directories(nix-extra-builtins PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
+-target_include_directories(nix-extra-builtins PUBLIC ${NIX_INCLUDE_DIRS})
+-target_compile_options(nix-extra-builtins PUBLIC ${NIX_CFLAGS_OTHER})
+-
+-install(TARGETS nix-extra-builtins DESTINATION lib/nix/plugins)
+diff --git a/extra-builtins.cc b/extra-builtins.cc
+index 3a0f90e..a96e7c7 100644
+--- a/extra-builtins.cc
++++ b/extra-builtins.cc
+@@ -1,12 +1,8 @@
+ #include <config.h>
+ #include <primops.hh>
+ #include <globals.hh>
+-#include <config-global.hh>
+ #include <eval-settings.hh>
+ #include <common-eval-args.hh>
+-#include <filtering-source-accessor.hh>
+-
+-#include "nix-plugins-config.h"
+ 
+ using namespace nix;
+ 
+@@ -24,9 +20,8 @@ static GlobalConfig::Register rp(&extraBuiltinsSettings);
+ static void extraBuiltins(EvalState & state, const PosIdx pos,
+     Value ** _args, Value & v)
+ {
+-    static auto extraBuiltinsFile = state.rootPath(CanonPath(extraBuiltinsSettings.extraBuiltinsFile.to_string()));
+-    if (auto rootFS2 = state.rootFS.dynamic_pointer_cast<AllowListSourceAccessor>())
+-        rootFS2->allowPrefix(CanonPath(extraBuiltinsFile.path.abs()));
++    static auto extraBuiltinsFile = state.rootPath(
++        CanonPath(extraBuiltinsSettings.extraBuiltinsFile.to_string()));
+ 
+     try {
+         auto fun = state.allocValue();
+@@ -56,7 +51,7 @@ static void extraBuiltins(EvalState & state, const PosIdx pos,
+         }
+         v.mkApp(fun, arg);
+         state.forceValue(v, pos);
+-    } catch (FileNotFound &) {
++    } catch (SysError &) {
+         v.mkNull();
+     }
+ }
+@@ -66,19 +61,3 @@ static RegisterPrimOp rp1({
+     .arity = 0,
+     .fun = extraBuiltins,
+ });
+-
+-static void cflags(EvalState & state, const PosIdx _pos,
+-    Value ** _args, Value & v)
+-{
+-    auto attrs = state.buildBindings(3);
+-    attrs.alloc("NIX_INCLUDE_DIRS").mkString(NIX_INCLUDE_DIRS);
+-    attrs.alloc("NIX_CFLAGS_OTHER").mkString(NIX_CFLAGS_OTHER);
+-    attrs.alloc("BOOST_INCLUDE_DIR").mkString(BOOST_INCLUDE_DIR);
+-    v.mkAttrs(attrs);
+-}
+-
+-static RegisterPrimOp rp2({
+-    .name = "__nix-cflags",
+-    .arity = 0,
+-    .fun = cflags,
+-});
+diff --git a/meson.build b/meson.build
+new file mode 100644
+index 0000000..0be6ce6
+--- /dev/null
++++ b/meson.build
+@@ -0,0 +1,18 @@
++project('lix-plugins',
++        ['c', 'cpp'],
++        default_options: ['cpp_std=gnu++20'],
++        version: '15.0.0')
++
++cpp = meson.get_compiler('cpp')
++pkgconfig = import('pkgconfig')
++
++lix_expr = dependency('lix-expr', version: '>=2.91')
++lix_store = dependency('lix-store', version: '>=2.91')
++lix_cmd = dependency('lix-cmd', version: '>=2.91')
++lix_main = dependency('lix-main', version: '>=2.91')
++boost = dependency('boost')
++
++library('lix-plugins',
++        'extra-builtins.cc',
++        dependencies: [lix_expr, lix_store, lix_cmd, lix_main, boost],
++        install: true)
+diff --git a/nix-plugins-config.h.in b/nix-plugins-config.h.in
+deleted file mode 100644
+index 459fea8..0000000
+--- a/nix-plugins-config.h.in
++++ /dev/null
+@@ -1,3 +0,0 @@
+-#define NIX_INCLUDE_DIRS "@NIX_INCLUDE_DIRS@"
+-#define NIX_CFLAGS_OTHER "@NIX_CFLAGS_OTHER@"
+-#define BOOST_INCLUDE_DIR "@BOOST_INCLUDE_DIR@"
+-- 
+2.47.0
+

pkgs/lix/lix-plugins/default.nix

@@ -0,0 +1,33 @@
+{
+  fetchFromGitHub,
+  stdenv,
+  meson,
+  ninja,
+  pkg-config,
+
+  lix,
+  boost182,
+}: stdenv.mkDerivation {
+  name = "lix-plugins";
+
+  src = fetchFromGitHub {
+    owner = "shlevy";
+    repo = "nix-plugins";
+    rev = "15.0.0";
+    hash = "sha256-C4VqKHi6nVAHuXVhqvTRRyn0Bb619ez4LzgUWPH1cbM=";
+  };
+  patches = [ ./0001-implement-lix-support.patch ];
+
+  mesonBuildType = "release";
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+  ];
+
+  buildInputs = [
+    lix
+    boost182
+  ];
+}