[refactor] Fix container namedtuple

This patch propagates the process object into the container namedtuple,
fix a couple of bad function calls and adapt the run command handler to
use that process object instead of just the pid of it.

nrm/containers.py

@@ -4,11 +4,10 @@ from aci import ImageManifest
 from collections import namedtuple
 import logging
 import os
-import signal
 from subprograms import ChrtClient, NodeOSClient, resources
 
 logger = logging.getLogger('nrm')
-Container = namedtuple('Container', ['uuid', 'manifest', 'pid'])
+Container = namedtuple('Container', ['uuid', 'manifest', 'process'])
 
 
 class ContainerManager(object):
@@ -72,7 +71,7 @@ class ContainerManager(object):
         c = Container(container_name, manifest, process)
         self.pids[process.pid] = c
         self.containers[container_name] = c
-        return process.pid
+        return process
 
     def delete(self, uuid):
         """Delete a container and kill all related processes."""
@@ -80,7 +79,7 @@ class ContainerManager(object):
         self.resourcemanager.update(uuid)
         c = self.containers[uuid]
         del self.containers[uuid]
-        del self.pids[c.pid.pid]
+        del self.pids[c.process.pid]
 
     def kill(self, uuid):
         """Kill all the processes of a container."""
@@ -88,11 +87,11 @@ class ContainerManager(object):
             c = self.containers[uuid]
             logger.debug("killing %r:", c)
             try:
-                c.pid.terminate()
+                c.process.proc.terminate()
             except OSError:
                 pass
 
     def list(self):
         """List the containers in the system."""
-        return [{'uuid': c.uuid, 'pid': c.pid.pid} for c in
+        return [{'uuid': c.uuid, 'pid': c.process.pid} for c in
                 self.containers.values()]

nrm/daemon.py

@@ -119,22 +119,14 @@ class Daemon(object):
                 logger.info("new target measure: %g", self.target)
             elif command == 'run':
                 logger.info("new container required: %r", msg)
-                pid = self.container_manager.create(msg)
-                if pid > 0:
-                    self.containerpids[pid] = msg['uuid']
+                process = self.container_manager.create(msg)
+                self.containerpids[process.pid] = msg['uuid']
                 # TODO: obviously we need to send more info than that
                 update = {'type': 'container',
                           'event': 'start',
                           'uuid': msg['uuid'],
                           'errno': 0,
-                              'pid': pid,
-                              }
-                    self.upstream_pub.send_json(update)
-                else:
-                    update = {'type': 'container',
-                              'event': 'start',
-                              'uuid': msg['uuid'],
-                              'errno': pid,
+                          'pid': process.pid,
                           }
                 self.upstream_pub.send_json(update)
             elif command == 'kill':