feat: create bridge only if not exist

Signed-off-by: sylvain-pierrot <sylvain.pierrot@etu.umontpellier.fr>

src/vmm/src/core/devices/virtio/net/bridge.rs

@@ -6,19 +6,24 @@ pub fn host_bridge(tap_name: String, bridge_name: String) {
     tokio::spawn(connection);
 
     futures::executor::block_on(async {
-        let _ = create_bridge(handle.clone(), bridge_name.clone()).await;
+        let _ = create_bridge_if_not_exist(handle.clone(), bridge_name.clone()).await;
         let _ = attach_link_to_bridge(handle, tap_name, bridge_name).await;
     })
 }
 
-async fn create_bridge(handle: Handle, name: String) -> Result<(), Error> {
-    handle
-        .link()
-        .add()
-        .bridge(name)
-        .execute()
-        .await
-        .map_err(|_| Error::RequestFailed)
+async fn create_bridge_if_not_exist(handle: Handle, name: String) -> Result<(), Error> {
+    let mut bridge_names = handle.link().get().match_name(name.clone()).execute();
+
+    match bridge_names.try_next().await? {
+        Some(_) => Ok(()),
+        None => handle
+            .link()
+            .add()
+            .bridge(name)
+            .execute()
+            .await
+            .map_err(|_| Error::RequestFailed),
+    }
 }
 
 async fn attach_link_to_bridge(
@@ -42,13 +47,13 @@ async fn attach_link_to_bridge(
         None => panic!(),
     };
 
-    handle
+    let _ = handle
         .link()
         .set(link_index)
         .controller(master_index)
         .execute()
         .await
-        .unwrap();
+        .map_err(|_| Error::RequestFailed);
 
     Ok(())
 }