Catch error when qemu additional options are invalid

Fix #119

gns3server/modules/qemu/qemu_vm.py

@@ -1068,7 +1068,10 @@ class QemuVM(BaseVM):
         command.extend(self._monitor_options())
         additional_options = self._options.strip()
         if additional_options:
-            command.extend(shlex.split(additional_options))
+            try:
+                command.extend(shlex.split(additional_options))
+            except ValueError as e:
+                QemuError("Invalid additional options: {} error {}".format(additional_options, e))
         command.extend(self._network_options())
         command.extend(self._graphic())
         return command

tests/modules/qemu/test_qemu_vm.py

@@ -280,6 +280,13 @@ def test_build_command_without_display(vm, loop, fake_qemu_binary):
         assert "-nographic" in cmd
 
 
+def test_build_command_witht_invalid_options(vm, loop, fake_qemu_binary):
+
+    vm.options = "'test"
+    with pytest.raises(QemuError):
+        cmd = loop.run_until_complete(asyncio.async(vm._build_command()))
+
+
 def test_hda_disk_image(vm, tmpdir):
 
     with patch("gns3server.config.Config.get_section_config", return_value={"images_path": str(tmpdir)}):