Remove XIP support.

Library/Homebrew/cask/lib/hbc/container.rb

@@ -16,7 +16,6 @@ require "hbc/container/tar"
 require "hbc/container/ttf"
 require "hbc/container/rar"
 require "hbc/container/xar"
-require "hbc/container/xip"
 require "hbc/container/xz"
 require "hbc/container/zip"
 
@@ -34,7 +33,6 @@ module Hbc
         Sit,
         Rar,
         Zip,
-        Xip,   # needs to be before xar as this is a cpio inside a gzip inside a xar
         Xar,   # need to be before tar as tar can also list xar
         Tar,   # or compressed tar (bzip2/gzip/lzma/xz)
         Bzip2, # pure bzip2

Library/Homebrew/cask/lib/hbc/container/xip.rb

-require "tmpdir"
-
-module Hbc
-  class Container
-    class Xip < Base
-      def self.me?(criteria)
-        criteria.magic_number(/^xar!/n) &&
-          IO.popen(["/usr/bin/xar", "-t", "-f", criteria.path.to_s], err: "/dev/null") { |io| io.read =~ /\AContent\nMetadata\n\Z/ }
-      end
-
-      def extract
-        Dir.mktmpdir do |unpack_dir|
-          begin
-            ohai "Verifying signature for #{@path.basename}"
-            @command.run!("/usr/sbin/pkgutil", args: ["--check-signature", @path])
-          rescue
-            raise "Signature check failed."
-          end
-
-          @command.run!("/usr/bin/xar", args: ["-x", "-f", @path, "Content", "-C", unpack_dir])
-
-          Dir.chdir(@cask.staged_path) do
-            @command.run!("/usr/bin/cpio", args: ["--quiet", "-i", "-I", Pathname(unpack_dir).join("Content")])
-          end
-        end
-      end
-    end
-  end
-end