Actually pass through the user property for bundle_install.

lib/poise_ruby/resources/bundle_install.rb

@@ -71,8 +71,8 @@ class Resource < Chef::Resource
         attribute(:retry, kind_of: [String, Integer])
         # @!attribute user
         #   User to run bundler as.
-        #   @return [String]
-        attribute(:user, kind_of: String)
+        #   @return [String, Integery, nil]
+        attribute(:user, kind_of: [String, Integer, NilClass])
         # @!attribute vendor
         #   Enable local vendoring. This maps to the `--path` option in bundler,
         #   but that attribute name is already used.
@@ -157,7 +157,7 @@ def gemfile_path
         # Install the gems in the Gemfile.
         def run_bundler(command)
           return converge_by "Run bundle #{command}" if whyrun_mode?
-          cmd = ruby_shell_out!(bundler_command(command), environment: {'BUNDLE_GEMFILE' => gemfile_path})
+          cmd = ruby_shell_out!(bundler_command(command), environment: {'BUNDLE_GEMFILE' => gemfile_path}, user: new_resource.user)
           # Look for a line like 'Installing $gemname $version' to know if we did anything.
           if cmd.stdout.include?('Installing')
             new_resource.updated_by_last_action(true)

test/spec/resources/bundle_install_spec.rb

@@ -40,7 +40,7 @@
   end # /describe PoiseRuby::Resources::BundleInstall::Resource
 
   describe PoiseRuby::Resources::BundleInstall::Provider do
-    let(:new_resource) { double('new_resource', parent_ruby: nil, timeout: 900, ruby: '/usr/bin/ruby') }
+    let(:new_resource) { double('new_resource', parent_ruby: nil, timeout: 900, ruby: '/usr/bin/ruby', user: nil) }
     let(:provider) { described_class.new(new_resource, nil) }
 
     describe '#action_install' do
@@ -63,7 +63,7 @@
       before do
         allow(provider).to receive(:bundler_command).and_return(%w{bundle install})
         allow(provider).to receive(:gemfile_path).and_return('Gemfile')
-        expect(provider).to receive(:ruby_shell_out!).with(%w{bundle install}, environment: {'BUNDLE_GEMFILE' => 'Gemfile'}).and_return(double(stdout: bundle_output))
+        expect(provider).to receive(:ruby_shell_out!).with(%w{bundle install}, environment: {'BUNDLE_GEMFILE' => 'Gemfile'}, user: nil).and_return(double(stdout: bundle_output))
       end
 
       context 'with a new gem' do