Merge pull request #11756 from carlocab/deuniversalize-machos

formula: add `deuniversalize_machos` method

Library/Homebrew/extend/os/linux/formula.rb

@@ -4,7 +4,9 @@
 class Formula
   undef shared_library
   undef rpath
+  undef deuniversalize_machos
 
+  sig { params(name: String, version: T.nilable(T.any(String, Integer))).returns(String) }
   def shared_library(name, version = nil)
     suffix = if version == "*" || (name == "*" && version.blank?)
       "{,.*}"
@@ -14,10 +16,14 @@ class Formula
     "#{name}.so#{suffix}"
   end
 
+  sig { returns(String) }
   def rpath
     "'$ORIGIN/../lib'"
   end
 
+  sig { params(targets: T.nilable(T.any(Pathname, String))).void }
+  def deuniversalize_machos(*targets); end
+
   class << self
     undef ignore_missing_libraries
 

Library/Homebrew/formula.rb

@@ -1589,6 +1589,38 @@ class Formula
     end
   end
 
+  # Replaces a universal binary with its native slice.
+  #
+  # If called with no parameters, does this with all compatible
+  # universal binaries in a {Formula}'s {Keg}.
+  sig { params(targets: T.nilable(T.any(Pathname, String))).void }
+  def deuniversalize_machos(*targets)
+    targets = nil if targets.blank?
+    targets ||= any_installed_keg.mach_o_files.select do |file|
+      file.arch == :universal && file.archs.include?(Hardware::CPU.arch)
+    end
+
+    targets.each { |t| extract_macho_slice_from(Pathname.new(t), Hardware::CPU.arch) }
+  end
+
+  # @private
+  sig { params(file: Pathname, arch: T.nilable(Symbol)).void }
+  def extract_macho_slice_from(file, arch = Hardware::CPU.arch)
+    odebug "Extracting #{arch} slice from #{file}"
+    file.ensure_writable do
+      macho = MachO::FatFile.new(file)
+      native_slice = macho.extract(Hardware::CPU.arch)
+      native_slice.write file
+      MachO.codesign! file if Hardware::CPU.arm?
+    rescue MachO::MachOBinaryError
+      onoe "#{file} is not a universal binary"
+      raise
+    rescue NoMethodError
+      onoe "#{file} does not contain an #{arch} slice"
+      raise
+    end
+  end
+
   # an array of all core {Formula} names
   # @private
   def self.core_names