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joystick: Don't use udev in Flatpak or pressure-vessel container

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Flatpak[1] and pressure-vessel[2] are known to use user namespaces,
therefore udev event notification via netlink won't work reliably.
Both frameworks provide a filesystem API that libraries can use to
detect them. Do that, and automatically fall back from udev-based
device discovery to the inotify-based fallback introduced in Bug #5337.

[1] <https://flatpak.org/>
[2] <https://gitlab.steamos.cloud/steamrt/steam-runtime-tools/-/tree/master/pressure-vessel>

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2020-11-23 21:10:48 -08:00
parent e9869e07bf
commit 8e2746cfb6
1 changed files with 10 additions and 0 deletions
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10
src/joystick/linux/SDL_sysjoystick.c
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@ -635,9 +635,19 @@ LINUX_JoystickInit(void)
#if SDL_USE_LIBUDEV
if (enumeration_method == ENUMERATION_UNSET) {
if (SDL_getenv("SDL_JOYSTICK_DISABLE_UDEV") != NULL) {
SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,
"udev disabled by SDL_JOYSTICK_DISABLE_UDEV");
enumeration_method = ENUMERATION_FALLBACK;
}
else if (access("/.flatpak-info", F_OK) == 0
|| access("/run/pressure-vessel", F_OK) == 0) {
SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,
"Container detected, disabling udev integration");
enumeration_method = ENUMERATION_FALLBACK;
}
else {
SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,
"Using udev for joystick device discovery");
enumeration_method = ENUMERATION_LIBUDEV;
}
}