[fix] ensure container has single owner

Ensure that the client that created the container is considered as the
one owning it, with the consequence that if its command exits, the
container is destroyed. Also deals with the race issue we had on the cmd
side.

nrm/daemon.py

@@ -25,6 +25,7 @@ logger = logging.getLogger('nrm')
 class Daemon(object):
     def __init__(self):
         self.target = 100.0
+        self.container_owner = dict()
 
     def do_downstream_receive(self, parts):
         logger.info("receiving downstream message: %r", parts)
@@ -107,6 +108,7 @@ class Daemon(object):
                           }
                 self.upstream_rpc_server.sendmsg(RPC_MSG['start'](**update),
                                                  client)
+                self.container_owner[container.uuid] = client
 
             # now deal with the process itself
             update = {'api': 'up_rpc_rep',
@@ -213,7 +215,9 @@ class Daemon(object):
                     logger.info("Process %s in Container %s has finised.",
                                 pid, container.uuid)
 
-                    if not container.processes:
+                    # if this process was owner of the container,
+                    # kill everything
+                    if self.container_owner[container.uuid] == clientid:
                         # deal with container exit
                         msg = {'api': 'up_rpc_rep',
                                'type': 'exit',
@@ -240,6 +244,7 @@ class Daemon(object):
                         self.container_manager.delete(container.uuid)
                         self.upstream_rpc_server.sendmsg(
                                 RPC_MSG['exit'](**msg), clientid)
+                        del self.container_owner[container.uuid]
             else:
                 logger.debug("child update ignored")
                 pass