diff --git a/pkgs/uvms/uvms.py b/pkgs/uvms/uvms.py
index d89a6ff..9a8582c 100644
--- a/pkgs/uvms/uvms.py
+++ b/pkgs/uvms/uvms.py
@@ -13,7 +13,7 @@ import json
 import re
 from argparse import ArgumentParser
 from contextlib import contextmanager, closing, ExitStack
-from urllib import urlparse
+from urllib.parse import urlparse, parse_qs
 
 
 parser = ArgumentParser("supervise-vm")
@@ -519,16 +519,21 @@ def main(args, args_next, cleanup, ps):
     app_paths = []
     for a in args.app:
         a = urlparse(a)
-        nix_file = None
+        nix_file = "./."
         attr = None
         if a.scheme == "":
             nix_file = "<nixpkgs>"
             attr = a.path
-        elif a.scheme == "getexe":
-            nix_file = a.netloc or "./."
-            attr = a.path.lstrip("/")
         else:
-            raise RuntimeError("Unknown app url", a)
+            assert a.fragment, a
+            attr = a.fragment
+            nix_file = a.path or "./."
+        arglist = []
+        for k, v in parse_qs(a.query).items():
+            arglist.append("--arg")
+            arglist.append(k)
+            arglist.append(v)
+
         assert nix_file is not None, a
         assert attr is not None, a
         out_path = ps.exec(
@@ -536,7 +541,9 @@ def main(args, args_next, cleanup, ps):
             nix_file,
             "-A",
             attr,
+            *arglist,
             "--no-out-link",
+            cwd=os.getcwd(),
             capture_output=True,
             text=True,
         ).stdout.strip()