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Bug 5488

Summary: HIDAPI on Linux relies on udev_monitor, which won't work in containers
Product: SDL Reporter: Simon McVittie <smcv>
Component: joystickAssignee: Sam Lantinga <slouken>
Status: WAITING --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.1   
Hardware: x86_64   
OS: Linux   

Description Simon McVittie 2021-01-20 12:14:13 UTC 
src/joystick/hidapi/SDL_hidapijoystick.c uses a udev_monitor to watch for changes to the set of devices available. Similar to Bug #5337, this isn't reliable in a container.

Similar to the evdev code path in src/joystick/linux/SDL_sysjoystick.c, if it detects a Flatpak or pressure-vessel container, it should fall back to using inotify instead of udev_monitor. The inotify should be on "/dev" to pick up devices matching "/dev/hidapi*", unlike the evdev code path which watches "/dev/input" for devices matching "/dev/input/event*". It would also be useful for debugging if there was an environment variable or hint that could be set to force the inotify code path.
Comment 1 Sam Lantinga 2021-01-20 18:18:43 UTC 
Can you provide a tested patch?
Comment 2 Simon McVittie 2021-01-20 20:05:49 UTC 
Not immediately, but I can add it to the queue.
Comment 3 Sam Lantinga 2021-01-20 21:13:36 UTC 
Great, thanks