Fix self-hosting

default.nix

@@ -3,69 +3,17 @@
 with pkgs;
 
 let
-  gradleEnvJson = builtins.fromJSON (builtins.readFile ./gradle/nix/gradle-env.json);
-  gradleDist = builtins.fromJSON (builtins.readFile ./gradle/nix/gradle-dist.json);
+  buildGradle = pkgs.callPackage ./gradle-env.nix {};
 
-  mkGradleEnv = callPackage ./gradle-env.nix {};
-  gradle = pkgs.gradleGen.gradleGen {
-    name = "gradle-dist-${gradleDist.version}-${gradleDist.type}";
-    src = pkgs.fetchurl {
-      inherit (gradleDist) url sha256;
-    };
-    inherit (gradleDist) nativeVersion;
-  };
-
-  maven = r: ''maven { url = uri("${r}") }'';
-
-  projects = lib.mapAttrsToList (path: envs: {
-    inherit path;
-    config = ''
-      buildscript {
-        repositories {
-          clear()
-          ${maven (mkGradleEnv envs.buildscript)}
-        }
-      }
-      repositories {
-        clear()
-        ${maven (mkGradleEnv envs.project)}
-      }
-    '';
-  }) gradleEnvJson;
-
-  initScript = pkgs.writeText "init.gradle" ''
-    gradle.settingsEvaluated {
-      it.pluginManagement.repositories {
-        clear()
-        ${maven (mkGradleEnv gradleEnvJson.":".plugins)}
-      }
-    }
-    gradle.projectsLoaded {
-    ${lib.concatMapStringsSep "\n" (p: ''
-      rootProject.project("${p.path}") {
-        ${p.config}
-      }
-    '') projects}
-    }
-  '';
-
-in stdenv.mkDerivation rec {
-  name = "gradle2nix-${version}";
-  version = "1.0";
+in buildGradle {
+  envSpec = ./gradle-env.json;
 
   src = ./.;
 
-  nativeBuildInputs = [ gradle ];
-
-  buildPhase = ''
-    export GRADLE_USER_HOME=$(mktemp -d)
-    gradle --offline --no-daemon --info --full-stacktrace --init-script ${initScript} installDist
-  '';
+  gradleFlags = [ "installDist" ];
 
   installPhase = ''
     mkdir -p $out
     cp -r app/build/install/gradle2nix/* $out/
   '';
-
-  dontStrip = true;
 }