Parse to a meaningful format in the nix output stream before hitting the running build.

src/nix_util/high_level.rs

@@ -33,7 +33,7 @@ where
         reference
     };
 
-    let mut command = Command::new("nixos-rebuild");
+    let mut command = Command::new("nix");
     command.current_dir(build_path);
     command.stdout(Stdio::piped());
     command.stderr(Stdio::piped());
@@ -41,7 +41,6 @@ where
     command.args([
         "build",
         "--show-trace",
-        "--sudo",
         "--max-jobs",
         "1",
         "--log-format",
@@ -49,7 +48,6 @@ where
         "-vvvvvvvvvvv",
         "--keep-going",
     ]);
-    command.arg("--flake");
     command.arg(reference);
     command.kill_on_drop(true);