nix-universal-prefetch: init at 0.2.0 (#53436)

pkgs/tools/package-management/nix-universal-prefetch/default.nix

@@ -0,0 +1,32 @@
+{ stdenv
+, fetchFromGitHub
+, ruby
+}:
+
+# No gems used, so mkDerivation is fine.
+stdenv.mkDerivation rec {
+  pname = "nix-universal-prefetch";
+  version = "0.2.0";
+
+  src = fetchFromGitHub {
+    owner = "samueldr";
+    repo = "nix-universal-prefetch";
+    rev = "v${version}";
+    sha256 = "1id9iaibrm2d3fa9dkcxnb3sd0j1vh502181gdd199a1cfsmzh1i";
+  };
+
+  installPhase = ''
+    mkdir -pv $out/bin
+    cp nix-universal-prefetch $out/bin/nix-universal-prefetch
+    substituteInPlace "$out/bin/nix-universal-prefetch" \
+      --replace "/usr/bin/env nix-shell" "${ruby}/bin/ruby"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Uses nixpkgs fetchers to figure out hashes";
+    homepage = https://github.com/samueldr/nix-universal-prefetch;
+    license = licenses.mit;
+    maintainers = with maintainers; [ samueldr ];
+    platforms = platforms.linux ++ platforms.darwin;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -22689,6 +22689,8 @@ in
 
   nix-top = callPackage ../tools/package-management/nix-top { };
 
+  nix-universal-prefetch = callPackage ../tools/package-management/nix-universal-prefetch { };
+
   nix-repl = throw (
     "nix-repl has been removed because it's not maintained anymore, " +
     (lib.optionalString (! lib.versionAtLeast "2" (lib.versions.major builtins.nixVersion))