fixing the cli option retry_download_count to support simulator

lib/xcode/install.rb

@@ -59,7 +59,7 @@ def fetch(url: nil,
       progress_log_file = File.join(CACHE_DIR, "progress.#{Time.now.to_i}.progress")
       FileUtils.rm_f(progress_log_file)
 
-      retry_options = ['--retry', '3']
+      retry_options = ['--retry', retry_download_count]
       command = [
         'curl',
         '--disable',

lib/xcode/install/simulators.rb

@@ -10,7 +10,8 @@ def self.options
         [['--install=name', 'Install simulator beginning with name, e.g. \'iOS 8.4\', \'tvOS 9.0\'.'],
          ['--force', 'Install even if the same version is already installed.'],
          ['--no-install', 'Only download DMG, but do not install it.'],
-         ['--no-progress', 'Don’t show download progress.']].concat(super)
+         ['--no-progress', 'Don’t show download progress.'],
+         ['--retry-download-count', 'Count of retrying download when curl is failed.']].concat(super)
       end
 
       def initialize(argv)
@@ -19,6 +20,7 @@ def initialize(argv)
         @force = argv.flag?('force', false)
         @should_install = argv.flag?('install', true)
         @progress = argv.flag?('progress', true)
+        @retry_download_count = argv.option('retry-download-count', '3')
         super
       end
 
@@ -42,7 +44,7 @@ def install
         simulator = filtered_simulators.first
         fail Informative, "#{simulator.name} is already installed." if simulator.installed? && !@force
         puts "Installing #{simulator.name} for Xcode #{simulator.xcode.bundle_version}..."
-        simulator.install(@progress, @should_install)
+        simulator.install(@progress, @should_install, @retry_download_count.to_i)
       else
         puts "[!] More than one simulator matching #{@install} was found. Please specify the full version.".ansi.red
         filtered_simulators.each do |candidate|