cask: add the choices option to pkg stanza

installer command accepts -applyChoiceChangesXML option to change
customize options on the GUI installer from the commandline.
(`man installer` for more detailed information)

The introduced option `choice` enables the choice changes to be supplied
via pkg stanza without tricks in preflight code.

1 files changed, 16 insertions, 1 deletions

diff --git a/Library/Homebrew/cask/lib/hbc/artifact/pkg.rb b/Library/Homebrew/cask/lib/hbc/artifact/pkg.rb
index d5e63d8ef..2f34814ab 100644
--- a/Library/Homebrew/cask/lib/hbc/artifact/pkg.rb
+++ b/Library/Homebrew/cask/lib/hbc/artifact/pkg.rb
@@ -2,6 +2,8 @@ require "hbc/artifact/base"
 
 require "hbc/utils/hash_validator"
 
+require "vendor/plist/plist"
+
 module Hbc
   module Artifact
     class Pkg < Base
@@ -16,7 +18,7 @@ module Hbc
         @pkg_install_opts = pkg_description.shift
         begin
           if @pkg_install_opts.respond_to?(:keys)
-            @pkg_install_opts.extend(HashValidator).assert_valid_keys(:allow_untrusted)
+            @pkg_install_opts.extend(HashValidator).assert_valid_keys(:allow_untrusted, :choices)
           elsif @pkg_install_opts
             raise
           end
@@ -52,8 +54,21 @@ module Hbc
         ]
         args << "-verboseR" if Hbc.verbose
         args << "-allowUntrusted" if pkg_install_opts :allow_untrusted
+        if pkg_install_opts :choices
+          args << "-applyChoiceChangesXML"
+          args << choices_xml
+        end
         @command.run!("/usr/sbin/installer", sudo: true, args: args, print_stdout: true)
       end
+
+      def choices_xml
+        path = @cask.staged_path.join("Choices.xml")
+        unless File.exist? path
+          choices = pkg_install_opts :choices
+          IO.write path, Plist::Emit.dump(choices)
+        end
+        path
+      end
     end
   end
 end