def _build_target()

in shim/shim.py [0:0]

• 30 lines of code
• 10 McCabe index (conditional complexity)

def _build_target(target: str, *, mode: Optional[str] = None) -> Path:
    LOG.info(f"Building `{target}`%s...", f" with `{mode}`" if mode else "")

    # If a target starts with fbcode, then it needs to be built from fbcode instead of from fbsource
    if ":" not in target:
        LOG.warning(
            f"Target `{target}` is an alias. Please expand it if it is a fbcode target. Otherwise buck build will fail."
        )
    fbcode_target_prefix = "fbcode//"
    is_fbcode_target = target.startswith(fbcode_target_prefix)
    if is_fbcode_target:
        target = target[len(fbcode_target_prefix) :]

    command = ["buck", "build", "--show-json-output"]
    if mode:
        command.append(str(mode))
    command.append(target)
    current_working_directory = Path(os.getcwd())
    working_directory = (
        current_working_directory / "fbcode"
        if is_fbcode_target
        else current_working_directory
    )
    output = subprocess.run(command, stdout=subprocess.PIPE, cwd=working_directory)
    if output.returncode != 0:
        raise ClientError(f"Error while building buck target `{target}`, aborting.")

    try:
        response = json.loads(output.stdout)
    except json.JSONDecodeError:
        response = {}

    if len(response) != 1 or len(next(iter(response.values()))) == 0:
        raise ClientError(f"Unexpected buck output:\n{output.stdout.decode()}")

    return working_directory / next(iter(response.values()))