host: expose harness state and actions over the world API

host/src/api/server.rs

@@ -120,6 +120,8 @@ pub async fn run_with_userland(
         crate::process::default_script(),
         Some(api.clone()),
     )?;
+    let (sender, receiver) = crate::harness::input::channel();
+    api.attach_harness(sender.clone());
     let listener = Listener::start_with_api(api, options)?;
     runtime
         .network_policy()
@@ -129,7 +131,13 @@ pub async fn run_with_userland(
         tokio::runtime::Builder::new_current_thread()
             .enable_all()
             .build()?
-            .block_on(crate::harness::run_console(world, Arc::new(runtime), cred))
+            .block_on(crate::harness::run_console_with_input(
+                world,
+                Arc::new(runtime),
+                cred,
+                sender,
+                receiver,
+            ))
     })
     .await
     .map_err(anyhow::Error::from)