Quick script to remove stale simulator device folders unused by Xcode, lists invalid devices if run without flags

clean-sims.rb

#!/usr/bin/ruby

require 'fileutils'
require 'optparse'

xcodePath = %x{xcode-select -print-path}
puts "Checking simulator devices against Xcode: #{xcodePath}"

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: clean-sims.rb [options]"

  opts.on("-d", "--delete", "Delete stale simulator devices") do |d|
    options[:delete] = d
  end
end.parse!

# Ask Xcode for sim device IDs
activeSims = %x{xcrun simctl list}
validDeviceIDs = {}
for line in activeSims.split("\n")
	m = /(.*)\s\(([\w\d]{8}-[\w\d]{4}-[\w\d]{4}-[\w\d]{4}-[\w\d]{12})(?:(?!unavailable).)*$/m.match(line)
	if m
		validDeviceIDs[m[2]] = m[1].strip
	end
end

def getDeviceInfo(devicePath, key)
	return %x{/usr/libexec/PlistBuddy -c "Print :#{key}" #{devicePath}/device.plist}.strip
end

# find all on-disk devices, compare against Xcode's list
for deviceFolder in Dir.glob(File.join(Dir.home, "/Library/Developer/CoreSimulator/Devices/*"))
	deviceID = File.basename(deviceFolder)
	isValid = false
	if not validDeviceIDs.has_key? deviceID
		name = getDeviceInfo(deviceFolder, 'name')
		runtime = getDeviceInfo(deviceFolder, 'runtime')
		puts "#{deviceID}(#{name}, #{runtime}) is invalid"
		if options[:delete]
			FileUtils.remove_entry_secure(deviceFolder)
		end
	end
end