tree-wide: make all our Varlink APIs introspectable

src/userdb/userwork.c

@@ -18,6 +18,7 @@
 #include "user-util.h"
 #include "userdb.h"
 #include "varlink.h"
+#include "varlink-io.systemd.UserDatabase.h"
 
 #define ITERATIONS_MAX 64U
 #define RUNTIME_MAX_USEC (5 * USEC_PER_MINUTE)
@@ -483,6 +484,10 @@ static int run(int argc, char *argv[]) {
         if (r < 0)
                 return log_error_errno(r, "Failed to allocate server: %m");
 
+        r = varlink_server_add_interface(server, &vl_interface_io_systemd_UserDatabase);
+        if (r < 0)
+                return log_error_errno(r, "Failed to add UserDatabase interface to varlink server: %m");
+
         r = varlink_server_bind_method_many(
                         server,
                         "io.systemd.UserDatabase.GetUserRecord",  vl_method_get_user_record,