Lennart Poettering
b485fd932a
Since kernel 4.13 the kerne allows passing a UUID to generated uevents. Optionally do so via a new sd_device_trigger_with_uuid() call, and add sd_device_get_trigger_uuid() as helper to retrieve the UUID from a uevent we receive. This is useful for tracking uevents through the udev system, and waiting for specific triggers. (Note that the 4.13 patch allows passing arbitrary meta-info into the uevent as well. This does not add an API for that, because I am not convinced it makes sense — as it conflicts with our general rule that events are "stateless" if you so will — and it complicates the interface quite a bit). This replaces #13881 in a way, which added a similar infra, but which stalled, and whose synchronous settling APIs are somewhat problematic and probably not material to merge.
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