4a6fe5f05e
varlink_server_listen_auto() is supposed to be the one-stop solution for turning simple command line tools into IPC services. They aren't easy to test/debug however, since you have to invoke them through a service manager. Let's make this easier: if the SYSTEMD_VARLINK_LISTEN env var is set, let's listen on the socket specified therein. This makes things easier to gdb: just run the service from the cmdline.
System and Service Manager
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