Deluge error on macOS: File open error - operation not supported

[Gregorio Litenstein]

Going back to times immemorial there have been reports of Deluge randomly pausing torrents and setting them to an error state on macOS...

I'd like to solve this but don't know where to begin. As it stands now, I'm seeing this error very frequently on MacOS 10.14.6, running my self-made .app package based on a PR I made from git master.

After setting loglevel debug on deluged, this is the error I get:

17:55:41.697 [DEBUG   ][deluge.core.alertmanager      :1418] Handling alert: session_stats_alert
17:55:41.697 [DEBUG   ][deluge.core.alertmanager      :1418] file_error_alert: Wolfwalkers.2020.HDR.2160p.WEB.h265-KOGi file_open (/Volumes/Movies/Wolfwalkers.2020.HDR.2160p.WEB.h265-KOGi/Sample/wolfwalkers.2020.hdr.2160p.web.h265-kogi.sample.mkv) error: Operation not supported

This error then repeats multiple times and the torrent is paused and set to error.

I can put some time and effort into helping fix this but as I said, I don't know where to begin.

[Gregorio Litenstein]

So... I haven't tested it extensively yet but it seems like this is a libtorrent bug. I think I fixed it for me by making a build against libtorrent 1.2.12.