cmd/mbf: optionally wait for cancel

Synchronisation is not needed here during interactive use.

Signed-off-by: Ophestra <cat@gensokyo.uk>

cmd/mbf/daemon.go

@@ -305,6 +305,7 @@ func cancelRemote(
 	ctx context.Context,
 	addr *net.UnixAddr,
 	a pkg.Artifact,
+	wait bool,
 ) error {
 	done, conn, err := dial(ctx, addr)
 	if err != nil {
@@ -323,8 +324,10 @@ func cancelRemote(
 	} else if n != len(id) {
 		return errors.Join(io.ErrShortWrite, conn.Close())
 	}
-	if _, err = conn.Read(make([]byte, 1)); err == io.EOF {
-		err = nil
+	if wait {
+		if _, err = conn.Read(make([]byte, 1)); err == io.EOF {
+			err = nil
+		}
 	}
 	return errors.Join(err, conn.Close())
 }
@@ -333,6 +336,7 @@ func cancelRemote(
 func abortRemote(
 	ctx context.Context,
 	addr *net.UnixAddr,
+	wait bool,
 ) error {
 	done, conn, err := dial(ctx, addr)
 	if err != nil {
@@ -341,7 +345,7 @@ func abortRemote(
 	defer close(done)
 
 	err = writeSpecialHeader(conn, specialAbort)
-	if err == nil {
+	if wait && err == nil {
 		if _, err = conn.Read(make([]byte, 1)); err == io.EOF {
 			err = nil
 		}