Merge remote-tracking branch 'github/master'

fix-macos-executables

@@ -0,0 +1,3 @@
+#!/bin/sh
+where="$1"
+find "$where" -perm +111 -a -type f -exec xattr -d com.apple.quarantine {} \;

mk-usb-music-disk-for-car

@@ -50,9 +50,11 @@ ARTISTS.lines.each do |artist|
     puts "Creating #{dest}"
     FileUtils.mkdir_p(dest)
     mp3_files.each do |mp3_file|
+      unless File.exist?("#{dest}/#{File.basename(mp3_file)}")
         puts "Copying #{mp3_file} -> #{dest}"
         FileUtils.cp(mp3_file, dest)
         system("sync", DEST)
       end
     end
+  end
 end