lxd/instance/drivers: Use shorter socket path in deviceAttachPath

Signed-off-by: hamistao <pedro.ribeiro@canonical.com>

lxd/instance/drivers/driver_qemu.go

@@ -2185,7 +2185,16 @@ func (d *qemu) deviceAttachPath(deviceName string, configCopy map[string]string,
 		return fmt.Errorf("Failed to connect to QMP monitor: %w", err)
 	}
 
-	addr, err := net.ResolveUnixAddr("unix", virtiofsdSockPath)
+	virtiofsdSocketDir, err := os.Open(filepath.Dir(virtiofsdSockPath))
+	if err != nil {
+		return err
+	}
+
+	defer func() { _ = virtiofsdSocketDir.Close() }()
+
+	shortPath := fmt.Sprintf("/proc/self/fd/%d/%s", virtiofsdSocketDir.Fd(), filepath.Base(virtiofsdSockPath))
+
+	addr, err := net.ResolveUnixAddr("unix", shortPath)
 	if err != nil {
 		return err
 	}