feat: implement build command to validate generated library

.generator/Dockerfile

@@ -36,20 +36,30 @@ RUN apt-get update && \
     rm -rf /var/lib/apt/lists/*
 
 # Set up environment variables for tool versions to make updates easier.
-ENV PYTHON_VERSION=3.11.5
 ENV BAZELISK_VERSION=v1.26.0
 
-# Create a symbolic link for `python3` to point to our specific version.
-ENV PATH /usr/local/bin/python3.11:$PATH
 
+RUN for PYTHON_VERSION in 3.9.23 3.10.18 3.11.13 3.12.11 3.13.5; do \
 # Install Python from source
-RUN wget https://www.python.org/ftp/python/${PYTHON_VERSION}/Python-${PYTHON_VERSION}.tgz && \
+    wget https://www.python.org/ftp/python/${PYTHON_VERSION}/Python-${PYTHON_VERSION}.tgz && \
     tar -xvf Python-${PYTHON_VERSION}.tgz && \
     cd Python-${PYTHON_VERSION} && \
     ./configure --enable-optimizations && \
     make altinstall && \
     cd / && \
-    rm -rf Python-${PYTHON_VERSION}*
+    rm -rf Python-${PYTHON_VERSION}* && \
+    # Install pip using the instructions below
+    # https://pip.pypa.io/en/stable/installation/#ensurepip
+    python${PYTHON_VERSION} -m ensurepip --upgrade \
+    ; done
+
+# Test Pip
+RUN python3.9 -m pip
+RUN python3.10 -m pip
+RUN python3.11 -m pip
+RUN python3.12 -m pip
+RUN python3.13 -m pip
+
 
 # TODO(https://github.com/googleapis/librarian/issues/904): Install protoc for gencode.
 

.generator/cli.py

@@ -15,9 +15,10 @@
 import argparse
 import json
 import logging
-import os
+import subprocess
 import sys
 import subprocess
+from typing import List
 
 logger = logging.getLogger()
 
@@ -113,8 +114,40 @@ def handle_generate():
     logger.info("'generate' command executed.")
 
 
+def _run_nox_sessions(sessions:List[str]):
+    """Calls nox with the specified sessions.
+
+    Args:
+        path (List[str]): The list of nox sessions to run.
+    """
+    # Read a generate-request.json file
+    try:
+        request_data = _read_json_file(f"{LIBRARIAN_DIR}/{GENERATE_REQUEST_FILE}")
+        library_id = request_data.get("id")
+        for nox_session in sessions:
+            command = ["nox", "-s", nox_session, "-f", f"{SOURCE_DIR}/packages/{library_id}"]
+            result = subprocess.run(command, capture_output=True, text=True, check=True)
+            logger.info(result)
+    except Exception as e:
+        raise ValueError("Generation failed.") from e
+
 def handle_build():
-    # TODO(https://github.com/googleapis/librarian/issues/450): Implement build command and update docstring.
+    """The main coordinator for validating client library generation."""
+    sessions = [
+        "unit-3.9",
+        "unit-3.10",
+        "unit-3.11",
+        "unit-3.12",
+        "unit-3.13",
+        "docs",
+        "system",
+        "lint",
+        "lint_setup_py",
+        "mypy",
+        "check_lower_bounds",
+    ]
+    _run_nox_sessions(sessions)
+
     logger.info("'build' command executed.")
 
 

.generator/test_cli.py

@@ -117,12 +117,15 @@ def test_handle_generate_fail(caplog):
         handle_generate()
 
 
-def test_handle_build_success(caplog, mock_generate_request_file):
+def test_handle_build_success(caplog, mocker):
     """
     Tests the successful execution path of handle_build.
     """
     caplog.set_level(logging.INFO)
 
+    mocker.patch(
+        "cli._run_nox_sessions", return_value="mock-result"
+    )
     handle_build()
 
     assert "'build' command executed." in caplog.text

cloudbuild.yaml

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+timeout: 7200s  # 2 hours
 steps:
   # This step builds the Docker image.
   - name: 'gcr.io/cloud-builders/docker'