feat: implement basic librarian configure command

.generator/cli.py

@@ -45,6 +45,7 @@
 
 BUILD_REQUEST_FILE = "build-request.json"
 GENERATE_REQUEST_FILE = "generate-request.json"
+CONFIGURE_REQUEST_FILE = "configure-response.json"
 RELEASE_INIT_REQUEST_FILE = "release-init-request.json"
 STATE_YAML_FILE = "state.yaml"
 
@@ -144,7 +145,28 @@ def handle_configure(
     Raises:
         ValueError: If configuring a new library fails.
     """
-    # TODO(https://github.com/googleapis/librarian/issues/466): Implement configure command and update docstring.
+    try:
+        # configure-request.json contains the library definitions.
+        request_data = _read_json_file(f"{librarian}/{CONFIGURE_REQUEST_FILE}")
+        for library_config in request_data.get("libraries", []):
+            is_new_library_or_api = False
+            if "apis" in library_config:
+                for api in library_config["apis"]:
+                    if api.get("status") == "new":
+                        is_new_library_or_api = True
+                        # Delete the status field since we don't need to include it in `configure-response.json`.
+                        del api["status"]
+
+            if is_new_library_or_api:
+                library_id = _get_library_id(library_config)
+                # TODO: Add missing information for the configured library.
+                request_data[library_id] = library_config
+
+        # Write the new library configuration to configure-response.json.
+        _write_json_file(f"{librarian}/configure-response.json", request_data[library_id])
+
+    except Exception as e:
+        raise ValueError("Configuring a new library failed.") from e
     logger.info("'configure' command executed.")
 
 

.generator/test_cli.py

@@ -28,6 +28,7 @@
 from cli import (
     GENERATE_REQUEST_FILE,
     BUILD_REQUEST_FILE,
+    CONFIGURE_REQUEST_FILE,
     RELEASE_INIT_REQUEST_FILE,
     SOURCE_DIR,
     STATE_YAML_FILE,
@@ -160,6 +161,30 @@ def mock_build_request_file(tmp_path, monkeypatch):
     return request_file
 
 
+@pytest.fixture
+def mock_configure_request_file(tmp_path, monkeypatch):
+    """Creates the mock request file at the correct path inside a temp dir."""
+    # Create the path as expected by the script: .librarian/configure-request.json
+    request_path = f"{LIBRARIAN_DIR}/{CONFIGURE_REQUEST_FILE}"
+    request_dir = tmp_path / os.path.dirname(request_path)
+    request_dir.mkdir(parents=True, exist_ok=True)
+    request_file = request_dir / os.path.basename(request_path)
+
+    request_content = {
+        "libraries": [
+            {
+                "id": "google-cloud-language",
+                "apis": [{"path": "google/cloud/language/v1", "status": "new"}],
+            }
+        ]
+    }
+    request_file.write_text(json.dumps(request_content))
+
+    # Change the current working directory to the temp path for the test.
+    monkeypatch.chdir(tmp_path)
+    return request_file
+
+
 @pytest.fixture
 def mock_build_bazel_file(tmp_path, monkeypatch):
     """Creates the mock BUILD.bazel file at the correct path inside a temp dir."""
@@ -261,17 +286,6 @@ def test_get_library_id_empty_id():
         _get_library_id(request_data)
 
 
-def test_handle_configure_success(caplog, mock_generate_request_file):
-    """
-    Tests the successful execution path of handle_configure.
-    """
-    caplog.set_level(logging.INFO)
-
-    handle_configure()
-
-    assert "'configure' command executed." in caplog.text
-
-
 def test_run_post_processor_success(mocker, caplog):
     """
     Tests that the post-processor helper calls the correct command.