Send command line used to start the VM to client

Add a command_line attribute to the VM object with
the command line used to start the VM.

Now /start return the object in order to get
this new attribute. And the HTTP status code
is 200 instead of 204 because 204 disallow body.

Support:
* Qemu
* Dynamips
* IOU

Ref https://github.com/GNS3/gns3-gui/issues/513

gns3server/modules/base_vm.py

@@ -58,6 +58,7 @@ class BaseVM:
         self._hw_virtualization = False
         self._ubridge_hypervisor = None
         self._vm_status = "stopped"
+        self._command_line = ""
 
         if self._console is not None:
             if console_type == "vnc":
@@ -94,6 +95,17 @@ class BaseVM:
         self._vm_status = status
         self._project.emit("vm.{}".format(status), self)
 
+    @property
+    def command_line(self):
+        """Return command used to start the VM"""
+
+        return self._command_line
+
+    @command_line.setter
+    def command_line(self, command_line):
+
+        self._command_line = command_line
+
     @property
     def project(self):
         """

gns3server/modules/iou/iou_vm.py

@@ -72,7 +72,6 @@ class IOUVM(BaseVM):
 
         super().__init__(name, vm_id, project, manager, console=console)
 
-        self._command = []
         self._iouyap_process = None
         self._iou_process = None
         self._iou_stdout_file = ""
@@ -220,7 +219,8 @@ class IOUVM(BaseVM):
                        "startup_config": self.relative_startup_config_file,
                        "private_config": self.relative_private_config_file,
                        "iourc_path": self.iourc_path,
-                       "use_default_iou_values": self._use_default_iou_values}
+                       "use_default_iou_values": self._use_default_iou_values,
+                       "command_line": self.command_line}
 
         # return the relative path if the IOU image is in the images_path directory
         iou_vm_info["path"] = self.manager.get_relative_image_path(self.path)
@@ -502,13 +502,14 @@ class IOUVM(BaseVM):
 
             if "IOURC" not in os.environ:
                 env["IOURC"] = iourc_path
-            self._command = yield from self._build_command()
+            command = yield from self._build_command()
             try:
-                log.info("Starting IOU: {}".format(self._command))
+                log.info("Starting IOU: {}".format(command))
                 self._iou_stdout_file = os.path.join(self.working_dir, "iou.log")
                 log.info("Logging to {}".format(self._iou_stdout_file))
                 with open(self._iou_stdout_file, "w", encoding="utf-8") as fd:
-                    self._iou_process = yield from asyncio.create_subprocess_exec(*self._command,
+                    self.command_line = ' '.join(command)
+                    self._iou_process = yield from asyncio.create_subprocess_exec(*command,
                                                                                   stdout=fd,
                                                                                   stderr=subprocess.STDOUT,
                                                                                   cwd=self.working_dir,

gns3server/modules/qemu/qemu_vm.py

@@ -68,7 +68,6 @@ class QemuVM(BaseVM):
         self._host = server_config.get("host", "127.0.0.1")
         self._monitor_host = server_config.get("monitor_host", "127.0.0.1")
         self._linked_clone = linked_clone
-        self._command = []
         self._process = None
         self._cpulimit_process = None
         self._monitor = None
@@ -867,15 +866,16 @@ class QemuVM(BaseVM):
                 # check if there is enough RAM to run
                 self.check_available_ram(self.ram)
 
-                self._command = yield from self._build_command()
-                command_string = " ".join(shlex.quote(s) for s in self._command)
+                command = yield from self._build_command()
+                command_string = " ".join(shlex.quote(s) for s in command)
                 try:
                     log.info("Starting QEMU with: {}".format(command_string))
                     self._stdout_file = os.path.join(self.working_dir, "qemu.log")
                     log.info("logging to {}".format(self._stdout_file))
                     with open(self._stdout_file, "w", encoding="utf-8") as fd:
                         fd.write("Start QEMU with {}\n\nExecution log:\n".format(command_string))
-                        self._process = yield from asyncio.create_subprocess_exec(*self._command,
+                        self.command_line = ' '.join(command)
+                        self._process = yield from asyncio.create_subprocess_exec(*command,
                                                                                   stdout=fd,
                                                                                   stderr=subprocess.STDOUT,
                                                                                   cwd=self.working_dir)

gns3server/modules/vpcs/vpcs_vm.py

@@ -59,7 +59,6 @@ class VPCSVM(BaseVM):
     def __init__(self, name, vm_id, project, manager, console=None, startup_script=None):
 
         super().__init__(name, vm_id, project, manager, console=console)
-        self._command = []
         self._process = None
         self._vpcs_stdout_file = ""
         self._vpcs_version = None
@@ -115,7 +114,8 @@ class VPCSVM(BaseVM):
                 "console": self._console,
                 "project_id": self.project.id,
                 "startup_script": self.startup_script,
-                "startup_script_path": self.relative_startup_script}
+                "startup_script_path": self.relative_startup_script,
+                "command_line": self.command_line}
 
     @property
     def relative_startup_script(self):
@@ -223,16 +223,17 @@ class VPCSVM(BaseVM):
             if not self._ethernet_adapter.get_nio(0):
                 raise VPCSError("This VPCS instance must be connected in order to start")
 
-            self._command = self._build_command()
+            command = self._build_command()
             try:
-                log.info("Starting VPCS: {}".format(self._command))
+                log.info("Starting VPCS: {}".format(command))
                 self._vpcs_stdout_file = os.path.join(self.working_dir, "vpcs.log")
                 log.info("Logging to {}".format(self._vpcs_stdout_file))
                 flags = 0
                 if sys.platform.startswith("win32"):
                     flags = subprocess.CREATE_NEW_PROCESS_GROUP
                 with open(self._vpcs_stdout_file, "w", encoding="utf-8") as fd:
-                    self._process = yield from asyncio.create_subprocess_exec(*self._command,
+                    self.command_line = ' '.join(command)
+                    self._process = yield from asyncio.create_subprocess_exec(*command,
                                                                               stdout=fd,
                                                                               stderr=subprocess.STDOUT,
                                                                               cwd=self.working_dir,