37cc66324c
In v257 userdbctl gained support for filtering user records with fuzzy matching and some other parameters. It was done on the client side only. This PR adds server-side matching, by exendting the generic userdb varlink api. The api is generic any may have many other implementors, hence care is taken to fallback to exclusively client side filtering in case the service does not support the new parameters. In fact I even opted to not actually implement server-side filtering in any services but systemd-userdbd.service, because it's probably not too much an optimization in relevant services (we might want to revisit this later). By implementing it in userdbd the primary entrypoint for userdb is however covered: the multiplexer interface which provides a single interface for the multitude of backends. Or in other words: the multiplexer itself supports server-side filtering even if its own backends don't, and will hide this neatly away. One nice side effect from not implementing server side filtering for all our backends is that the fallback codepaths are comprehensively tested. Note that this adds some unit tests but not new integration test for all this, as the filtering tests for userdbctl already existed before, we just move their implementation from the client to the server side.
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