If I am not mistaken, remote execution with -H sends 2 Hello messages to the dbus. 1 coming with the bus initialization, other coming from the stdio bridge. Can someone double check this please?
Hmm, no. In stdio-bridge we create the bus connections with sd_bus_new() and do not invoke sd_bus_set_bus_client() on them. This means no hello message is sent from stdio-bridge itself, on the real clients hello message is followed. Closing. (Feel free to reopen if you really noticed duplicate hello messages to be received.)
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