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Instance Method Details

#mysql_locked(&block) ⇒ Object 



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# File 'bin/ec2-consistent-snapshot-rb', line 52

def mysql_locked(&block)
  mysql = nil
  
  if $opts[:mysql]
    require 'mysql'
    mysql = Mysql::new($opts[:mysql_host], $opts[:mysql_username], $opts[:mysql_password])
    mysql.query("SET SQL_LOG_BIN=0")
    mysql.query("FLUSH LOCAL TABLES")
    mysql.query("FLUSH LOCAL TABLES WITH READ LOCK")
    
    def query_result_string(mysql, query)
      result = mysql.query(query)
      string = ""
      if result.num_rows() > 0
        result.fetch_row.each_with_index do |value, i|
          string << "#{result.fetch_field_direct(i).name}: #{value}\n"
        end
      end
      string
    end
    
    if $opts[:mysql_slave_status_file]
      File.open($opts[:mysql_slave_status_file], "w") {|f| f.puts query_result_string(mysql, "SHOW SLAVE STATUS"); f.fsync }
    end
    
    if $opts[:mysql_master_status_file]
      File.open($opts[:mysql_master_status_file], "w") {|f| f.puts query_result_string(mysql, "SHOW MASTER STATUS"); f.fsync }
    end
    
    mysql.query("SET SQL_LOG_BIN=1")
  end
  
  begin
    yield
  ensure
    mysql.real_query("UNLOCK TABLES") if mysql
  end
end

#xfs_frozen(&block) ⇒ Object 



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# File 'bin/ec2-consistent-snapshot-rb', line 91

def xfs_frozen(&block)
  system('xfs_freeze', '-f', $opts[:xfs_filesystem]) if $opts[:xfs_filesystem]
  
  begin
    yield
  ensure
    system('xfs_freeze', '-u', $opts[:xfs_filesystem]) if $opts[:xfs_filesystem]
  end
end