clan-core: add clan meta for ui usage

pkgs/clan-cli/tests/test_create_flake.py

@@ -47,3 +47,33 @@ def test_create_flake(
         flake_outputs["nixosConfigurations"]["machine1"]
     except KeyError:
         pytest.fail("nixosConfigurations.machine1 not found in flake outputs")
+
+
+@pytest.mark.impure
+def test_ui_template(
+    monkeypatch: pytest.MonkeyPatch,
+    capsys: pytest.CaptureFixture,
+    temporary_home: Path,
+    cli: Cli,
+) -> None:
+    flake_dir = temporary_home / "test-flake"
+    url = "git+https://git.clan.lol/clan/clan-core#empty"
+    cli.run(["flakes", "create", str(flake_dir), "--url", url])
+    assert (flake_dir / ".clan-flake").exists()
+    monkeypatch.chdir(flake_dir)
+    cli.run(["machines", "create", "machine1"])
+    capsys.readouterr()  # flush cache
+
+    cli.run(["machines", "list"])
+    assert "machine1" in capsys.readouterr().out
+    flake_show = subprocess.run(
+        ["nix", "flake", "show", "--json"],
+        check=True,
+        capture_output=True,
+        text=True,
+    )
+    flake_outputs = json.loads(flake_show.stdout)
+    try:
+        flake_outputs["nixosConfigurations"]["machine1"]
+    except KeyError:
+        pytest.fail("nixosConfigurations.machine1 not found in flake outputs")