webui: tests for machine config endpoints

pkgs/clan-cli/tests/conftest.py

@@ -1,5 +1,10 @@
 import os
 import sys
+import tempfile
+from pathlib import Path
+from typing import Generator
+
+import pytest
 
 sys.path.append(os.path.join(os.path.dirname(__file__), "helpers"))
 
@@ -14,3 +19,40 @@ pytest_plugins = [
     "ports",
     "host_group",
 ]
+
+
+@pytest.fixture(scope="module")
+def monkeymodule() -> Generator[pytest.MonkeyPatch, None, None]:
+    with pytest.MonkeyPatch.context() as mp:
+        yield mp
+
+
+# fixture for the example flake located under ./example_flake
+# The flake is a template that is copied to a temporary location.
+# Variables like __CLAN_NIXPKGS__ are replaced with the value of the
+# CLAN_NIXPKGS environment variable.
+@pytest.fixture(scope="module")
+def machine_flake(monkeymodule: pytest.MonkeyPatch) -> Generator[Path, None, None]:
+    CLAN_NIXPKGS = os.environ.get("CLAN_NIXPKGS", "")
+    if CLAN_NIXPKGS == "":
+        raise Exception("CLAN_NIXPKGS not set")
+    template = Path(__file__).parent / "machine_flake"
+    # copy the template to a new temporary location
+    with tempfile.TemporaryDirectory() as tmpdir_:
+        flake = Path(tmpdir_)
+        for path in template.glob("**/*"):
+            if path.is_dir():
+                (flake / path.relative_to(template)).mkdir()
+            else:
+                (flake / path.relative_to(template)).write_text(path.read_text())
+        # in the flake.nix file replace the string __CLAN_URL__ with the the clan flake
+        # provided by get_clan_flake_toplevel
+        flake_nix = flake / "flake.nix"
+        flake_nix.write_text(
+            flake_nix.read_text().replace("__CLAN_NIXPKGS__", CLAN_NIXPKGS)
+        )
+        # check that an empty config is returned if no json file exists
+        monkeymodule.chdir(flake)
+        # monkeypatch get_clan_flake_toplevel to return the flake
+        monkeymodule.setattr("clan_cli.dirs.get_clan_flake_toplevel", lambda: flake)
+        yield flake