Wait for pipe file to be created before starting the remote console for VMware and VirtualBox VMs. Fixes #331.

gns3server/modules/virtualbox/virtualbox_vm.py

@@ -30,6 +30,7 @@ import asyncio
 
 from pkg_resources import parse_version
 from gns3server.utils.telnet_server import TelnetServer
+from gns3server.utils.asyncio import wait_for_file_creation
 from .virtualbox_error import VirtualBoxError
 from ..nios.nio_udp import NIOUDP
 from ..nios.nio_nat import NIONAT
@@ -214,6 +215,10 @@ class VirtualBoxVM(BaseVM):
         yield from self.manager.execute("guestproperty", ["set", self._vmname, "ProjectDirInGNS3", self.working_dir])
 
         if self._enable_remote_console and self._console is not None:
+            try:
+                yield from wait_for_file_creation(self._get_pipe_name())  # wait for VirtualBox to create the pipe file.
+            except asyncio.TimeoutError:
+                raise VirtualBoxError('Pipe file "{}" for remote console has not been created by VirtualBox'.format(self._get_pipe_name()))
             self._start_remote_console()
 
         if (yield from self.check_hw_virtualization()):