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backend: error out in autocreate without libinput support 

The libinput backend is now optional. However, this means that a
user building wlroots without the correct libinput dependencies
will end up with a compositor which doesn't respond to input events.

wlr_backend_autocreate is supposed to return a sensible setup, so in
this case let's just error out and explain what happened. Users can
suppress the check by setting WLR_LIBINPUT_NO_DEVICES=1 (already used
to suppress the zero input device case inside the libinput backend).

Compositors which really want to create a bare DRM backend can easily
create it manually instead of using wlr_backend_autocreate.

(cherry picked from commit ec2845750862cc0b175bef59de4305f6da91960a)
This commit is contained in:
Simon Ser 2021-12-19 16:39:57 +01:00
parent 9f41627aa1
commit 7864f26d73
1 changed files with 13 additions and 0 deletions
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13
backend/backend.c
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@ -364,6 +364,19 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
return NULL;
}
wlr_multi_backend_add(backend, libinput);
#else
const char *no_devs = getenv("WLR_LIBINPUT_NO_DEVICES");
if (no_devs && strcmp(no_devs, "1") == 0) {
wlr_log(WLR_INFO, "WLR_LIBINPUT_NO_DEVICES is set, "
"starting without libinput backend");
} else {
wlr_log(WLR_ERROR, "libinput support is not compiled in, "
"refusing to start");
wlr_log(WLR_ERROR, "Set WLR_LIBINPUT_NO_DEVICES=1 to suppress this check");
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
return NULL;
}
#endif
#if WLR_HAS_DRM_BACKEND