Check silence_root_warning option to skip warning on root install cmds

lib/bundler/cli/install.rb

@@ -157,7 +157,7 @@ def run
   private
 
     def warn_if_root
-      return if Bundler::WINDOWS || !Process.uid.zero?
+      return if Bundler.settings[:silence_root_warning] || Bundler::WINDOWS || !Process.uid.zero?
       Bundler.ui.warn "Don't run Bundler as root. Bundler can ask for sudo " \
         "if it is needed, and installing your bundle as root will break this " \
         "application for all non-root users on this machine.", :wrap => true

lib/bundler/settings.rb

@@ -2,7 +2,7 @@
 
 module Bundler
   class Settings
-    BOOL_KEYS = %w(frozen cache_all no_prune disable_local_branch_check ignore_messages gem.mit gem.coc).freeze
+    BOOL_KEYS = %w(frozen cache_all no_prune disable_local_branch_check ignore_messages gem.mit gem.coc silence_root_warning).freeze
     NUMBER_KEYS = %w(retry timeout redirect ssl_verify_mode).freeze
     DEFAULT_CONFIG = { :retry => 3, :timeout => 10, :redirect => 5 }
 

spec/install/gems/sudo_spec.rb

@@ -143,10 +143,36 @@
   end
 
   describe "and root runs install" do
-    it "warns against that" do
+    let(:warning) { "Don't run Bundler as root." }
+
+    before do
       gemfile %|source "file://#{gem_repo1}"|
+    end
+
+    it "warns against that" do
       bundle :install, :sudo => true
-      expect(out).to include("Don't run Bundler as root.")
+      expect(out).to include(warning)
+    end
+
+    context "when ENV['BUNDLE_SILENCE_ROOT_WARNING'] is set" do
+      it "skips the warning" do
+        bundle :install, :sudo => :preserve_env, :env => { "BUNDLE_SILENCE_ROOT_WARNING" => true }
+        expect(out).to_not include(warning)
+      end
+    end
+
+    context "when silence_root_warning is passed as an option" do
+      it "skips the warning" do
+        bundle :install, :sudo => true, :silence_root_warning => true
+        expect(out).to_not include(warning)
+      end
+    end
+
+    context "when silence_root_warning = false" do
+      it "warns against that" do
+        bundle :install, :sudo => true, :silence_root_warning => false
+        expect(out).to include(warning)
+      end
     end
   end
 end

spec/support/helpers.rb

@@ -64,7 +64,9 @@ def spec
 
     def bundle(cmd, options = {})
       expect_err = options.delete(:expect_err)
-      sudo       = "sudo" if options.delete(:sudo)
+      with_sudo = options.delete(:sudo)
+      sudo = with_sudo == :preserve_env ? "sudo -E" : "sudo" if with_sudo
+
       options["no-color"] = true unless options.key?("no-color") || %w(exec conf).include?(cmd.to_s[0..3])
 
       bundle_bin = File.expand_path("../../../exe/bundle", __FILE__)