Run process with lockfile¶

import fcntl
import os
import sys
import time

# Use the script name to generate a unique lock file
LOCKFILE = f"/tmp/{os.path.basename(__file__)}.lock"


def work() -> None:
    time.sleep(999)


if __name__ == "__main__":
    try:
        # Open a file and acquire an exclusive lock
        with open(LOCKFILE, "w") as lockfile:
            fcntl.flock(lockfile, fcntl.LOCK_EX | fcntl.LOCK_NB)
            print("Acquired lock, running script...")

            # Main script logic here
            work()

    except BlockingIOError:
        print("Another instance is running. Exiting.")
        sys.exit(1)