Stefan Agner
908c38f300
Verify that a DNS-SD service registered via the D-Bus RegisterService() call is bound to the lifetime of the client's bus connection: since busctl disconnects right after the call returns, the service must be unregistered again shortly after. Wait for resolved's vanish handler log message as proof that the client tracking triggered the unregistration, check that a subsequent UnregisterService() fails specifically because the service is not known anymore, and verify that the identifier can be registered again — previously it stayed taken by the vanished client's service forever, failing with DNSSD_SERVICE_EXISTS. A dummy link with mDNS enabled makes sure the per-scope goodbye/zone teardown path actually runs, and since resolved would be restarted automatically if it crashed in it, letting the D-Bus level checks pass vacuously, verify the InvocationID stayed the same throughout.
System and Service Manager
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