PermissionError: [Errno 13] Permission denied while using Watchdog library

by

What will you learn?

Explore how to effectively handle a PermissionError with error code 13 (Permission denied) when utilizing the Watchdog library in Python.

Introduction to the Problem and Solution

When engaging with file system monitoring tools like Watchdog in Python, encountering a PermissionError denoting that the program lacks the necessary permissions to access a file or directory is common. This issue arises when attempting to monitor system files that demand elevated privileges. To overcome this hurdle, it’s essential to ensure that your program possesses the required permissions or adjust your code to gracefully manage such errors.

Code

# Import necessary libraries
import sys
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

# Define a custom event handler class    
class MyHandler(FileSystemEventHandler):
    def on_modified(self, event):
        print(f'Event type: {event.event_type}  path : {event.src_path}')

if __name__ == "__main__":
    # Create an observer object    
    observer = Observer()
    # Schedule watching for changes in a specific directory   
    observer.schedule(MyHandler(), path='/path/to/directory', recursive=True)

    try:
        # Start the observer  
        observer.start()
        print('Observer started')

        # Keep the script running  
        while True:
            pass

    except PermissionError as e:
        print(f'PermissionError: {e}')

    except Exception as e:
        print(f'An error occurred: {e}')

    finally:
        observer.stop()
        observer.join()

# For more help and resources, visit PythonHelpDesk.com 

# Copyright PHD

Explanation

  • Import essential libraries such as sys, Observer from watchdog.observers, and FileSystemEventHandler from watchdog.events.
  • Define a custom event handler class MyHandler inheriting from FileSystemEventHandler. Override the on_modified method for handling file modification events.
  • In the main block, instantiate an Observer, set it to monitor changes in a specified directory, and initiate it.
  • Implement exception handling (try-except) to capture potential errors. Specifically address a PermissionError by displaying an error message.
  • Conclude by stopping and joining the observer process.
    How do I resolve ‘Permission denied’ error when using Watchdog library?

    Ensure adequate permissions for your program. Admin rights or adjusting file/directory permissions might be necessary.

    What causes ‘PermissionError: [Errno 13]’ in Python programs?

    This error surfaces when your program lacks permission for certain operations like reading/writing specific files or directories.

    Can I ignore ‘Permission denied’ errors altogether?

    It’s advisable not to overlook these errors as they could signify critical access right issues. Handle them appropriately instead.

    Is there a way to elevate privileges within my script?

    Avoid modifying user privileges programmatically due to security concerns. Initiate your script with appropriate permissions initially.

    Should I always catch specific exceptions like ‘PermissionError’ individually?

    While beneficial for enhanced error handling, consider broader exception categories based on context for comprehensive coverage.

    How can I troubleshoot permission-related issues further?

    Consult OS-specific permission settings documentation/resources and explore pythonic approaches for effective permission management.

    Conclusion

    Dive into this comprehensive guide where you delved into addressing Permissions Error specifically concerning the utilization of Watchdog library in Python. By implementing adept exception handling strategies and grasping fundamental concepts of filesystem permissions management, you pave the way for crafting resilient applications without compromising system integrity.

    Leave a Comment