[Teton] Add ls and cd commands to rust impl.

rust/lib/victoriafalls/src/lib.rs

@@ -4,4 +4,22 @@ use core::include;
 
 include!(concat!(env!("OUT_DIR"), "/yunq.rs"));
 
+pub mod dir;
 pub mod file;
+
+static mut VFS_CLIENT: Option<VFSClient> = None;
+
+fn get_client() -> &'static mut VFSClient {
+    unsafe {
+        if let None = VFS_CLIENT {
+            let endpoint_cap = yellowstone::from_init_endpoint()
+                .get_endpoint(&yellowstone::GetEndpointRequest {
+                    endpoint_name: "victoriafalls".to_string(),
+                })
+                .expect("Failed to get VFS endpoint");
+
+            VFS_CLIENT = Some(VFSClient::new(endpoint_cap.endpoint));
+        }
+        VFS_CLIENT.as_mut().unwrap()
+    }
+}