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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.
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@ -364,6 +364,19 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
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return NULL;
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}
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wlr_multi_backend_add(backend, libinput);
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#else
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const char *no_devs = getenv("WLR_LIBINPUT_NO_DEVICES");
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if (no_devs && strcmp(no_devs, "1") == 0) {
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wlr_log(WLR_INFO, "WLR_LIBINPUT_NO_DEVICES is set, "
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"starting without libinput backend");
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} else {
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wlr_log(WLR_ERROR, "libinput support is not compiled in, "
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"refusing to start");
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wlr_log(WLR_ERROR, "Set WLR_LIBINPUT_NO_DEVICES=1 to suppress this check");
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wlr_session_destroy(multi->session);
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wlr_backend_destroy(backend);
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return NULL;
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}
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#endif
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#if WLR_HAS_DRM_BACKEND
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