Merge pull request #5020 from amyspark/repair-xattr

zip: restore extended attributes when under MacOS

Library/Homebrew/extend/os/mac/unpack_strategy/zip.rb

@@ -2,11 +2,22 @@ module UnpackStrategy
   class Zip
     prepend Module.new {
       def extract_to_dir(unpack_dir, basename:, verbose:)
-        volumes = super.stderr.chomp
+        result = super
+
+        volumes = result.stderr.chomp
                         .split("\n")
                         .map { |l| l[/\A   skipping: (.+)  volume label\Z/, 1] }
                         .compact
 
+        if result.stderr.lines.any? { |line| line.start_with?("._") }
+          # Merge ._ files back into extended attributes.
+          # ._ files inside volumes are automatically merged by ditto.
+          system_command!("dot_clean",
+                          args: ["-mv", "--keep=dotbar", unpack_dir],
+                          verbose: verbose,
+                          print_stderr: false)
+        end
+
         return if volumes.empty?
 
         Dir.mktmpdir do |tmp_unpack_dir|