def download_grcov()

in report/firefox_code_coverage/codecoverage.py [0:0]

• 28 lines of code
• 4 McCabe index (conditional complexity)

def download_grcov():
    local_path = os.path.join(os.getcwd(), "grcov")
    local_version = os.path.join(os.getcwd(), "grcov_ver")

    dest = tempfile.mkdtemp(suffix="grcov")
    archive = os.path.join(dest, "grcov.tar.zst")
    index = taskcluster.get_service("index")
    url = index.buildUrl("findArtifactFromTask", GRCOV_INDEX, GRCOV_ARTIFACT)
    download_binary(url, archive)

    # Extract archive in temp
    dctx = zstandard.ZstdDecompressor()
    with open(archive, "rb") as f:
        with dctx.stream_reader(f) as reader:
            with tarfile.open(mode="r|", fileobj=reader) as tar:
                tar.extractall(dest)
    os.remove(archive)

    # Get version from grcov binary
    grcov = os.path.join(dest, "grcov", "grcov")
    assert os.path.exists(grcov), "Missing grcov binary"
    assert os.path.isfile(grcov), "grcov should be a file"
    version = subprocess.check_output([grcov, "--version"]).decode("utf-8")

    # Compare version with currently available
    if os.path.exists(local_path) and os.path.exists(local_version):
        with open(local_version, "r") as f:
            installed_ver = f.read()

        if installed_ver == version:
            return local_path

    # Promote downloaded version to installed one
    shutil.move(grcov, local_path)
    shutil.rmtree(dest)
    with open(local_version, "w") as f:
        f.write(version)

    return local_path