mysql_ramdisk.rb

#!/usr/bin/env ruby

shutdown = false
cnf_path = '/usr/local/etc/my_ramdisk.cnf'
ramdisk_path = '/Volumes/RAMDisk'

loop { case ARGV[0]
    when 'shutdown' then  ARGV.shift; shutdown = true
    else break
end; }

if shutdown
    puts 'Shutting down mysql on ramdisk'
	if system('mysqladmin -u root -h 127.0.0.1 -P3306 shutdown')
		puts 'Shutdown initated, waiting 5 seconds and removing ramdisk'
		sleep 5
		puts 'Unmounting ramdisk'
		if system('hdiutil detach ' + ramdisk_path)
			puts 'Unmounting done'
		else
			puts 'Unmounting failed, waiting 5 more seconds and retrying'
			if system('hdiutil detach ' + ramdisk_path)
				puts 'Unmounting done'
			else
				puts 'Unmounting failed, please try to unmount manually'
				abort
			end
		end
	else
		puts 'Shutdown failed'
	end
	exit
end

if File.directory?(ramdisk_path)
	puts 'Ramdisk already exist, please use "./mysql_ramdisk shutdown" to clean up things'
	abort
end

puts 'Detecting mysql vendor'

if File.directory?('/usr/local/opt/percona-server')
	mysql_basedir = '/usr/local/opt/percona-server'
elsif File.directory?('/usr/local/opt/mysql')
	mysql_basedir = '/usr/local/opt/mysql'
else
	puts 'Cannot find a valid mysql basedir'
	abort
end

puts 'Writing mysql configuration file ' + cnf_path

begin
  file = File.open(cnf_path, "w")
  file.write("[mysqld]
port = 3307
socket = /tmp/mysql.sock
datadir = #{ramdisk_path}") 
rescue IOError => e
  puts 'Error writing file!'
  abort
ensure
  file.close unless file == nil
end

puts 'Creating ramdisk at ' + ramdisk_path

if system('diskutil erasevolume HFS+ RAMDisk `hdiutil attach -nomount ram://1048576` > /dev/null')
	puts 'Creation succesfull'
else
	puts 'Creation failed'
end

puts 'Initialiting default mysql database into ramdisk'

if system('mysql_install_db --basedir=' + mysql_basedir + ' --datadir=' + ramdisk_path + ' > /dev/null')
	puts 'Initialization done'
else
	puts 'Initialization failed'
	abort
end

puts 'Starting mysql instance on port 3306 using ramdisk as data folder storage'

spawn('mysqld_safe --defaults-file=' + cnf_path + ' > /dev/null')