airdcpp-share-monitor 
AirDC++ extension that will monitor the shared directories for changes and apply them in share.
What's new in each version
Troubleshooting
Enable extension debug mode from application settings and check the extension error logs (Settings\extensions\airdcpp-search-sites\logs) for additional information.
Common issues
The extensions exits with "Error: watch /share/root/ ENOSPC" in the error log (Linux only)
The maximum limit for directory watchers was reached. You may see the current limit on your system by executing the command cat /proc/sys/fs/inotify/max_user_watches in terminal.
As Linux doesn't have support for watching directories for changes recursively, the extension needs to go through all roots and their subdirectories and add an individual watcher for each of them. If the total number of directories in your share is larger than the system limit for directory watchers, adding of watchers will fail.
Solution 1
If you don't need to watch all shared directories for changes, you may set some of the root as Incoming on the Share page and configure the extension to monitor incoming roots only.
Solution 2
You may increase the maximum watcher limit on your system (instructions)
Development
Help wanted
Pull requests with new validation modules are welcome. When developing new modules, please write tests as well.
This extension is based on the airdcpp-create-extension example project, that provides instructions for AirDC++ extension development.
You may run the tests with npm run test.