upgrade connection plugin

connection_plugins/lxc/README.md

@@ -7,7 +7,11 @@ The plugin will use lxc-attach under the hood to connect to containers
 INSTALL
 =======
 
-1. Clone the plugin in your ansible directory
+* Install python2 version of lxc bindings:
+
+   - https://github.com/lxc/python2-lxc
+
+* Clone the plugin in your ansible directory
 
 ```
 $ mkdir -p /etc/ansible/connection_plugins/
@@ -21,9 +25,11 @@ $ mkdir -p /etc/ansible/connection_plugins/
 $ git submodule add git@github.com:Mic92/ansible-lxc.git /etc/ansible/connection_plugins/lxc
 ```
 
-2. Then add lxc directory to plugin search path in `ansible.cfg`:
+* Then add lxc directory to plugin search path in `ansible.cfg`:
 
+```
 connection_plugins = /usr/share/ansible_plugins/connection_plugins:/etc/ansible/connection_plugins/lxc
+```
 
 USAGE
 =====

connection_plugins/lxc/lxc.py

@@ -4,6 +4,8 @@ import distutils.spawn
 import os,sys
 import subprocess
 import shutil
+import traceback
+import re
 from ansible import errors
 from ansible.callbacks import vvv
 
@@ -20,6 +22,11 @@ class Connection(object):
 
     def _root_fs(self):
         rootfs = self.container.get_running_config_item("lxc.rootfs")
+        # overlayfs use the scheme:
+        #   overlayfs:/var/lib/lxc/LXC-Template-1404/rootfs:/var/lib/lxc/lxc-demo/delta0
+        match = re.match(r'^overlayfs:.+?rootfs:(.+)', rootfs)
+        if match:
+            rootfs = match.group(1)
         if not rootfs:
             raise errors.AnsibleError("rootfs not set in configuration for %s") % self.host
         return rootfs
@@ -48,9 +55,9 @@ class Connection(object):
 
     def _generate_cmd(self, executable, cmd):
         if executable:
-            return [self.lxc_attach, "-e", "--name", self.host, "--", executable, "-c", cmd]
+            return [self.lxc_attach, "--name", self.host, "--", executable, "-c", cmd]
         else:
-            return "%s -e --name %s -- %s" % (self.lxc_attach, self.host, cmd)
+            return "%s --name %s -- %s" % (self.lxc_attach, self.host, cmd)
 
     def exec_command(self, cmd, tmp_path, sudo_user=None, sudoable=False, executable="/bin/sh", in_data=None, su=None, su_user=None):
         """ run a command on the chroot """