Merge pull request #2410 from reitermarkus/container-exectuable

Add `Container::Executable`.

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

@@ -4,6 +4,7 @@ require "hbc/container/bzip2"
 require "hbc/container/cab"
 require "hbc/container/criteria"
 require "hbc/container/dmg"
+require "hbc/container/executable"
 require "hbc/container/generic_unar"
 require "hbc/container/gzip"
 require "hbc/container/lzma"
@@ -39,6 +40,7 @@ module Hbc
         Gzip,  # pure gzip
         Lzma,  # pure lzma
         Xz,    # pure xz
+        Executable,
       ]
       # for explicit use only (never autodetected):
       # Hbc::Container::Naked

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

@@ -0,0 +1,18 @@
+require "hbc/container/naked"
+require "vendor/macho/macho"
+
+module Hbc
+  class Container
+    class Executable < Naked
+      def self.me?(criteria)
+        return true if criteria.magic_number(/^#!\s*\S+/)
+
+        begin
+          MachO.open(criteria.path).header.executable?
+        rescue MachO::MagicError
+          false
+        end
+      end
+    end
+  end
+end