def get_root_block_device()

in selftest/selftest.py [0:0]

• 17 lines of code
• 3 McCabe index (conditional complexity)

def get_root_block_device() -> str:
    """Get the root block device using findmnt."""
    try:
        proc = subprocess.run(
            ["findmnt", "-n", "-o", "SOURCE", "/"],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True,
            check=True,
        )
        logger.debug("findmnt output: %r", proc)
        return proc.stdout.strip()
    except subprocess.CalledProcessError as error:
        logger.error("error while fetching root block device: %r", error)
        raise
    except FileNotFoundError:
        logger.error("findmnt command not found")
        raise