Prevent vagrant package from blowing up

lib/vagrant-lxc/action/setup_package_files.rb

@@ -45,7 +45,9 @@ module Vagrant
           box_dir = @env[:machine].box.directory
           FileUtils.cp box_dir.join('lxc-template').to_s, @env['package.directory'].to_s
           FileUtils.cp box_dir.join('metadata.json').to_s, @env['package.directory'].to_s
-          FileUtils.cp box_dir.join('lxc.conf').to_s, @env['package.directory'].to_s
+          if (conf = box_dir.join('lxc.conf')).exist?
+            FileUtils.cp conf.to_s, @env['package.directory'].to_s
+          end
         end
       end
     end

spec/unit/action/setup_package_files_spec.rb

@@ -20,13 +20,15 @@ describe Vagrant::LXC::Action::SetupPackageFiles do
     end
 
     subject.stub(recover: true) # Prevents files from being removed on specs
-    subject.call(env)
   end
 
   after do
     FileUtils.rm_rf(tmp_path.to_s)
   end
 
+  context 'when all files exist' do
+    before { subject.call(env) }
+
     it 'copies box lxc-template to package directory' do
       env['package.directory'].join('lxc-template').should be_file
     end
@@ -43,4 +45,15 @@ describe Vagrant::LXC::Action::SetupPackageFiles do
       env['package.directory'].join(rootfs_path.basename).should be_file
       env['package.rootfs'].should_not be_file
     end
+  end
+
+  context 'when lxc.conf file is not present' do
+    before do
+      box.directory.join('lxc.conf').delete
+    end
+
+    it 'does not blow up' do
+      expect { subject.call(env) }.to_not raise_error
+    end
+  end
 end