Add support for XIP archives. (#23343)

Casks/suspicious-package.rb

@@ -7,8 +7,5 @@ cask 'suspicious-package' do
   homepage 'http://www.mothersruin.com/software/SuspiciousPackage/'
   license :gratis
 
-  depends_on formula: 'unar'
-  container type: :generic_unar
-
   app 'Suspicious Package.app'
 end

lib/hbc/container.rb

@@ -18,6 +18,7 @@ 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"
 
@@ -34,12 +35,13 @@ class Hbc::Container
       Hbc::Container::Sit,
       Hbc::Container::Rar,
       Hbc::Container::Zip,
+      Hbc::Container::Xip,   # needs to be before xar as this is a cpio inside a gzip inside a xar
+      Hbc::Container::Xar,   # need to be before tar as tar can also list xar
       Hbc::Container::Tar,   # or compressed tar (bzip2/gzip/lzma/xz)
       Hbc::Container::Bzip2, # pure bzip2
       Hbc::Container::Gzip,  # pure gzip
       Hbc::Container::Lzma,  # pure lzma
       Hbc::Container::Xz,    # pure xz
-      Hbc::Container::Xar,
     ]
     # for explicit use only (never autodetected):
     # Hbc::Container::Naked

lib/hbc/container/xip.rb

@@ -0,0 +1,25 @@
+require "tmpdir"
+
+class Hbc::Container::Xip < Hbc::Container::Base
+  def self.me?(criteria)
+    criteria.magic_number(%r{^xar!}n) &&
+      IO.popen(["/usr/bin/xar", "-t", "-f", criteria.path.to_s], err: "/dev/null") { |io| io.read =~ %r{\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