Add check or dry-run command to verify if there is anything to sync

[adaliszk]

First off, thank you very much for doing this excellent utility!

As a server owner who tries to add a simple mod for its users to click and sync mods, I want to do a preflight check where the users would get a confirmation if they need to close Minecraft or not. For this, we need a dry-run check to see if any work needs to be done. Ideally, this would be a new flag, like --check which would verify the files to be synced and return an OK or ERROR status code to any CLI executor.

Context:

• Serversync Version: 4.2.0
• Minecraft Version: 1.20.1

[rheimus]

This would presumably be the client side doing a check against the server?

Would this also log some sort of list of missing files along with exiting non zero?

[adaliszk]

Ideally it would be nice to log out the result, though for that I wanted to open a new ticket to add a --json flag to convert the output so that inter-process calls would able to efficiently communicate :)