get ip from inventory with filter

filter_plugin/ip_from_inventory.py

@@ -1,14 +1,12 @@
-from ansible.hostvars import HostVars
-
-def ip_from_inventory(hostname):
+def ip_from_inventory(hostvars, hostname):
     """
     replace this ``{{ hostvars[hostname]['ansible_host'] }}``
-    with something nicer such as `` {{ hostname | ip_from_inventory }}``
+    with something nicer such as `` {{ hostvars | ip_from_inventory(hostname) }}``
     """
-    return HostVars[hostname]['ansible_host']
+    return hostvars[hostname]['ansible_host']
 
 class FilterModule(object):
-    def filter(self):
+    def filters(self):
         return {
                 'ip_from_inventory': ip_from_inventory,
         }

roles/lxc_guest/tasks/main.yaml

@@ -69,9 +69,9 @@
     verbosity: 2
 
 - name: update container DNS configuration
-  shell: lxc-attach -n {{ vm_name }} --clear-env -e -- bash -c "grep -Pz1 'domain lilik.it\nnameserver {{ vm_gateway }}' /etc/resolv.conf || echo -e 'domain lilik.it\nnameserver {{ vm_gateway }}' > /etc/resolv.conf"
+  shell: lxc-attach -n {{ vm_name }} --clear-env -e -- bash -c "grep -Pz1 'domain lilik.it\nnameserver {{ hostvars | ip_from_inventory('vm_gateway')) }}' /etc/resolv.conf || echo -e 'domain lilik.it\nnameserver {{ hostvars | ip_from_inventory('vm_gateway') }}' > /etc/resolv.conf"
   register: container_dns_configuration
-  changed_when: container_dns_configuration.stdout != "domain lilik.it\nnameserver {{ vm_gateway }}\n\u0000"
+  changed_when: container_dns_configuration.stdout != "domain lilik.it\nnameserver {{ hostvars | ip_from_inventory('vm_gateway') }}\n\u0000"
 
 - name: update container network configuration
   shell: lxc-attach -n {{ vm_name }} --clear-env -e -- bash -c "grep -F 'iface eth0 inet manual' /etc/network/interfaces || sed -i 's/iface eth0 inet dhcp/iface eth0 inet manual/' /etc/network/interfaces"

roles/lxc_guest/templates/config.j2

@@ -10,6 +10,6 @@ lxc.network.type = veth
 lxc.network.flags = up
 lxc.network.link = br0
 lxc.network.name = eth0
-lxc.network.ipv4 = {{ hostvars[vm_name]['ansible_host'] }}/24
-lxc.network.ipv4.gateway = {{ vm_gateway }}
+lxc.network.ipv4 = {{ hostvars | ip_from_inventory(vm_name) }}/24
+lxc.network.ipv4.gateway = {{ hostvars | ip_from_inventory('vm_gateway') }}
 lxc.start.auto = {% if auto_start %}1{% else %}0{% endif %}

templates/interfaces.j2

@@ -16,6 +16,6 @@ iface br0 inet manual
 auto {{ ansible_default_ipv4.alias }}
 iface {{ ansible_default_ipv4.alias }} inet static
 	address {{ ansible_default_ipv4.address }}
-        gateway {{ management_gateway }}
+        gateway {{ hostvars | ip_from_inventory('management_gateway') }}
         netmask 255.255.255.0
 	vlan-raw-device {{ ansible_default_ipv4.alias }}