Add build-clan module

pkgs/clan-cli/clan_cli/machines/list.py

@@ -1,9 +1,13 @@
 import argparse
+import json
 import logging
 from pathlib import Path
 
 from clan_cli.api import API
+from clan_cli.cmd import run_no_stdout
+from clan_cli.errors import ClanError
 from clan_cli.inventory import Machine, load_inventory_eval
+from clan_cli.nix import nix_eval
 
 log = logging.getLogger(__name__)
 
@@ -14,9 +18,29 @@ def list_machines(flake_url: str | Path, debug: bool = False) -> dict[str, Machi
     return inventory.machines
 
 
+@API.register
+def list_nixos_machines(flake_url: str | Path, debug: bool = False) -> list[str]:
+    cmd = nix_eval(
+        [
+            f"{flake_url}#nixosConfigurations",
+            "--apply",
+            "builtins.attrNames",
+            "--json",
+        ]
+    )
+    proc = run_no_stdout(cmd)
+
+    try:
+        res = proc.stdout.strip()
+        data = json.loads(res)
+        return data
+    except json.JSONDecodeError as e:
+        raise ClanError(f"Error decoding machines from flake: {e}")
+
+
 def list_command(args: argparse.Namespace) -> None:
     flake_path = args.flake.path
-    for name in list_machines(flake_path, args.debug).keys():
+    for name in list_nixos_machines(flake_path, args.debug):
         print(name)