[Feature Request] Automatically reload auth file

[penguinpowernz]

This feature assumes connections will be broken if server is restarted.

This would come in handy for building the auth file programmatically from a separate data source to avoid.

There's three ways we could do it in increasing levels of complexity:

1. Reload every x second regardless
2. Catch SIGUSR1 to trigger a reload
3. Use inotify to trigger a reload when the file changes

Not sure which will be best.

[jpillora]

I think a poll every 5 seconds would be simplest. It's not a huge change, would you willing to send a PR?

These lines from server.go, can be moved into a function

		users, err := chshare.ParseUsers(config.AuthFile)
		if err != nil {
			return nil, err
		}
		s.Users = users

The function can run in a loop on a timer, it will need to be guarded with file change detection, and s.Users will need a sync.Mutex protecting it

[penguinpowernz]

Yea mate, I'll take a stab at it. Cheers

[jpillora]

Option 3. has been implemented in 1.2.4