WIP B3: pin route admission past the gate

src/control_plane.rs

@@ -13905,13 +13905,21 @@ mod tests {
 
         #[test]
         fn route_admission_gets_past_its_gate_without_reading_odin() -> Result<()> {
+            // The step below would run the host's real nginx, so it only runs
+            // where there is none.
+            if Path::new("/usr/sbin/nginx").exists() {
+                return Ok(());
+            }
             let routed = routed_world(Odin::Unreachable, 1, DeploymentPhase::Fencing, false)?;
             routed.stub.set_state("active");
             routed.run_to_routing()?;
-            // The host's nginx is not here, so the step fails at installing the
-            // route: past the admission gate, which would have failed on Odin.
+            // The step fails at installing the route: past the admission gate,
+            // which would have failed on Odin.
             let failure = format!("{:#}", routed.step().expect_err("no nginx in the test world"));
-            assert!(failure.contains("XXXX"), "{failure}");
+            assert!(
+                failure.contains("starting route actuator /usr/sbin/nginx"),
+                "{failure}"
+            );
             routed.assert_odin_untouched()?;
             Ok(())
         }