Enable possibility to enforce PollingObserver by setting the environment variable WATCHMEDO_FORCE_POLLING

[peterlauri]

This enables possibility to enforce the usage of PollingObserver by setting the environment variable WATCHMEDO_FORCE_POLLING.

[peterlauri]

I see that the Travis CI build fails, but it looks to be a timeout issue.

[tamland]

I suggest doing something similar to --debug-force-polling from log just to keep things consistent. (More like your initial version.) Feel free to load environment variables etc. in watchmedo parts, but loading environment variables in the core python API is IMO not a very good idea and it could lead to all sorts of weird issues. (Anyone using the python API should explicitly import polling if they want it)

[peterlauri]

Actually, I was trying to keep it consistent in the end, by loading the proper Observer in init.py based on the environment, as well as the other switches are relying on the type of platform. And this wouldn't have any side effects on people using the python API, of course it needs to be documented.

[peterlauri]

But, I do think that there should be an command line option for watchmedo as well, not just to rely on the environment variable.

[mafrosis]

+1 this will enable watchmedo to be used over network fileshare. Related to #316

[tamland]

Closing in favor of #336