Utils::Cp: Move macOS-specific code to extend/os/mac

Library/Homebrew/extend/os/cp.rb

@@ -0,0 +1,4 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "extend/os/mac/utils/cp" if OS.mac?

Library/Homebrew/extend/os/mac/utils/cp.rb

@@ -0,0 +1,30 @@
+# typed: true
+# frozen_string_literal: true
+
+module Utils
+  module Cp
+    class << self
+      module MacOSOverride
+        private
+
+        # Use the lightweight `clonefile(2)` syscall if applicable.
+        SONOMA_FLAGS = ["-c"].freeze
+
+        sig { returns(T::Array[String]) }
+        def extra_flags
+          # The `cp` command on older macOS versions also had the `-c` option, but before Sonoma,
+          # the command would fail if the `clonefile` syscall isn't applicable (the underlying
+          # filesystem doesn't support the feature or the source and the target are on different
+          # filesystems).
+          if MacOS.version >= :sonoma
+            SONOMA_FLAGS
+          else
+            super
+          end
+        end
+      end
+
+      prepend MacOSOverride
+    end
+  end
+end

Library/Homebrew/utils/cp.rb

@@ -1,6 +1,7 @@
 # typed: true
 # frozen_string_literal: true
 
+require "extend/os/cp"
 require "system_command"
 
 module Utils
@@ -39,20 +40,10 @@ module Utils
 
       private
 
-      # Use the lightweight `clonefile(2)` syscall if applicable.
-      MACOS_FLAGS = ["-c"].freeze
       GENERIC_FLAGS = [].freeze
 
-      sig { returns(T::Array[String]) }
       def extra_flags
-        # The `cp` command on older macOS versions also had the `-c` option, but before Sonoma, the
-        # command would fail if the `clonefile` syscall isn't applicable (the underlying filesystem
-        # doesn't support the feature or the source and the target are on different filesystems).
-        if OS.mac? && MacOS.version >= :sonoma
-          MACOS_FLAGS
-        else
-          GENERIC_FLAGS
-        end
+        GENERIC_FLAGS
       end
     end
   end