#157: Fixed: FetchIpFromDnsmasqLeases returns []

lib/vagrant-lxc/driver/cli.rb

@@ -119,7 +119,7 @@ module Vagrant
 
         def supports_attach_with_namespaces?
           unless defined?(@supports_attach_with_namespaces)
-            @supports_attach_with_namespaces = run(:attach, '-h', '2>&1').include?('--namespaces')
+            @supports_attach_with_namespaces = run(:attach, '-h', :show_stderr => true).values.join.include?('--namespaces')
           end
 
           return @supports_attach_with_namespaces

lib/vagrant-lxc/sudo_wrapper.rb

@@ -58,7 +58,14 @@ module Vagrant
 
         # Return the output, making sure to replace any Windows-style
         # newlines with Unix-style.
-        r.stdout.gsub("\r\n", "\n")
+        if opts[:show_stderr]
+          {
+            :stdout => r.stdout.gsub("\r\n", "\n"),
+            :stderr => r.stderr.gsub("\r\n", "\n")
+          }
+        else
+          r.stdout.gsub("\r\n", "\n")
+        end
       end
 
       def raw(*command, &block)