Monitor IOU nvram for change

With the save as you go we need to save the startup config
when a change appear instead of the old commit system.

gns3server/compute/iou/__init__.py

@@ -72,23 +72,6 @@ class IOU(BaseManager):
         yield from super().close_node(node_id, *args, **kwargs)
         return node
 
-    @asyncio.coroutine
-    def project_committed(self, project):
-        """
-        Called when a project has been committed.
-
-        :param project: Project instance
-        """
-
-        # save the configs when the project is committed
-        for node in self._nodes.copy().values():
-            if node.project.id == project.id:
-                try:
-                    node.save_configs()
-                except IOUError as e:
-                    log.warning(e)
-                    continue
-
     def get_application_id(self, node_id):
         """
         Get an unique application identifier for IOU.

gns3server/compute/iou/iou_vm.py

@@ -46,10 +46,10 @@ from ..base_node import BaseNode
 from .utils.iou_import import nvram_import
 from .utils.iou_export import nvram_export
 from .ioucon import start_ioucon
+from gns3server.utils.file_watcher import FileWatcher
 import gns3server.utils.asyncio
 import gns3server.utils.images
 
-
 import logging
 import sys
 log = logging.getLogger(__name__)
@@ -91,9 +91,17 @@ class IOUVM(BaseNode):
         self._ram = 256  # Megabytes
         self._l1_keepalives = False  # used to overcome the always-up Ethernet interfaces (not supported by all IOSes).
 
+        self._nvram_watcher = None
+
     def _config(self):
         return self._manager.config.get_section_config("IOU")
 
+    def _nvram_changed(self, path):
+        """
+        Called when the NVRAM file as changed
+        """
+        self.save_configs()
+
     @asyncio.coroutine
     def close(self):
         """
@@ -424,6 +432,12 @@ class IOUVM(BaseNode):
                                                                                                          self.iourc_path,
                                                                                                          hostname))
 
+    def _nvram_file(self):
+        """
+        Path to the nvram file
+        """
+        return os.path.join(self.working_dir, "nvram_{:05d}".format(self.application_id))
+
     def _push_configs_to_nvram(self):
         """
         Push the startup-config and private-config content to the NVRAM.
@@ -431,7 +445,7 @@ class IOUVM(BaseNode):
 
         startup_config_content = self.startup_config_content
         if startup_config_content:
-            nvram_file = os.path.join(self.working_dir, "nvram_{:05d}".format(self.application_id))
+            nvram_file = self._nvram_file()
             try:
                 if not os.path.exists(nvram_file):
                     open(nvram_file, "a").close()
@@ -489,6 +503,8 @@ class IOUVM(BaseNode):
             # check if there is enough RAM to run
             self.check_available_ram(self.ram)
 
+            self._nvram_watcher = FileWatcher(self._nvram_file(), self._nvram_changed)
+
             # created a environment variable pointing to the iourc file.
             env = os.environ.copy()
 
@@ -544,7 +560,7 @@ class IOUVM(BaseNode):
         Before starting the VM, rename the nvram and vlan.dat files with the correct IOU application identifier.
         """
 
-        destination = os.path.join(self.working_dir, "nvram_{:05d}".format(self.application_id))
+        destination = self._nvram_file()
         for file_path in glob.glob(os.path.join(glob.escape(self.working_dir), "nvram_*")):
             shutil.move(file_path, destination)
         destination = os.path.join(self.working_dir, "vlan.dat-{:05d}".format(self.application_id))
@@ -644,6 +660,10 @@ class IOUVM(BaseNode):
         Stops the IOU process.
         """
 
+        if self._nvram_watcher:
+            self._nvram_watcher.close()
+            self._nvram_watcher = None
+
         if self.is_running():
             # stop console support
             if self._ioucon_thread: