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Don't use udev for joystick enumeration if running in a container 

If we are running in a container, like Flatpak[1] or pressure-vessel[2],
it's likely that we are using user namespaces,
therefore udev event notification via netlink won't work reliably.
Use their filesystem API to detect them and automatically fallback to
the inotify-based enumeration.

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

Signed-off-by: Ludovico de Nittis <ludovico.denittis@collabora.com>
This commit is contained in:
Ludovico de Nittis 2021-02-16 14:13:30 +01:00 committed by Sam Lantinga
parent 2c3269152a
commit 8d43f45a7b
2 changed files with 12 additions and 1 deletions
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8
src/joystick/hidapi/SDL_hidapijoystick.c
View File

@ -740,6 +740,14 @@ HIDAPI_JoystickInit(void)
SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,
"udev disabled by SDL_HIDAPI_JOYSTICK_DISABLE_UDEV");
linux_enumeration_method = ENUMERATION_FALLBACK;
} else if (access("/.flatpak-info", F_OK) == 0
|| access("/run/host/container-manager", F_OK) == 0) {
/* Explicitly check `/.flatpak-info` because, for old versions of
* Flatpak, this was the only available way to tell if we were in
* a Flatpak container. */
SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,
"Container detected, disabling HIDAPI udev integration");
linux_enumeration_method = ENUMERATION_FALLBACK;
} else {
SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,
"Using udev for HIDAPI joystick device discovery");

5
src/joystick/linux/SDL_sysjoystick.c
View File

@ -658,7 +658,10 @@ LINUX_JoystickInit(void)
enumeration_method = ENUMERATION_FALLBACK;
}
else if (access("/.flatpak-info", F_OK) == 0
|| access("/run/pressure-vessel", F_OK) == 0) {
|| access("/run/host/container-manager", F_OK) == 0) {
/* Explicitly check `/.flatpak-info` because, for old versions of
* Flatpak, this was the only available way to tell if we were in
* a Flatpak container. */
SDL_LogDebug(SDL_LOG_CATEGORY_INPUT,
"Container detected, disabling udev integration");
enumeration_method = ENUMERATION_FALLBACK;