Fall back to dnsmasq leases file if not able to fetch IP with lxc-attach

Closes GH-118

CHANGELOG.md

@@ -1,9 +1,10 @@
 ## [0.6.1](https://github.com/fgrehm/vagrant-lxc/compare/v0.6.0...master) (unreleased)
 
-  IMPROVEMENTS:
+IMPROVEMENTS:
 
-    - New base boxes with support for lxc 1.0+
+  - Fall back to `dnsmasq` leases file if not able to fetch IP with `lxc-attach` [#118](https://github.com/fgrehm/vagrant-lxc/issues/118)
   - Make sure lxc templates are executable prior to `lxc-create` [#128](https://github.com/fgrehm/vagrant-lxc/issues/128)
+  - New base boxes with support for lxc 1.0+
 
 BUG FIXES:
 

lib/vagrant-lxc/action/fetch_ip_with_lxc_attach.rb

@@ -12,6 +12,9 @@ module Vagrant
 
           def call(env)
             env[:machine_ip] ||= assigned_ip(env)
+          rescue LXC::Errors::ExecuteError
+            @logger.info 'Unable to fetch IP with `lxc-attach`!'
+          ensure
             @app.call(env)
           end