move from documenting to automating configurable-impure-env

panel/README.md

@@ -4,11 +4,6 @@ The Fediversity Panel is a web service for managing Fediversity deployments with
 
 ## Development
 
-- In your [nix.conf](https://nix.dev/manual/nix/latest/command-ref/conf-file) (Nix) / `nix.settings` (NixOS),
-to your [`experimental-features`](https://nix.dev/manual/nix/latest/command-ref/conf-file#conf-experimental-features)
-add [`configurable-impure-env`](https://nix.dev/manual/nix/latest/development/experimental-features#xp-feature-configurable-impure-env).
-Note that this features is only available in Nix, not in Lix.
-
 - To obtain all tools related to this project, enter the development environment with `nix-shell`.
 
   If you want to do that automatically on entering this directory:

panel/src/panel/views.py

@@ -59,8 +59,19 @@ class ConfigurationForm(LoginRequiredMixin, FormView):
             }
             print(f"env: {env}")
             print(f"Path: {os.getcwd()}/..")
-            subprocess.run(["nix", "develop", "--command", "nixops4", "--show-trace",
-                           "--verbose", "apply", "test"], cwd=os.getenv("REPO_DIR") or f"{os.getcwd()}/..", env=env)
+            cmd = [
+                "nix",
+                "develop",
+                "--extra-experimental-features",
+                "configurable-impure-env",
+                "--command",
+                "nixops4",
+                "--show-trace",
+                "--verbose",
+                "apply",
+                "test",
+            ]
+            subprocess.run(cmd, cwd=os.getenv("REPO_DIR") or f"{os.getcwd()}/..", env=env)
         return obj
 
     # TODO(@fricklerhandwerk):