Class: CMDHandle

Inherits:
Object show all
Defined in:
lib/base/backup.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cmd, timeout = nil, &blk) ⇒ CMDHandle

Returns a new instance of CMDHandle.



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# File 'lib/base/backup.rb', line 166

def initialize(cmd, timeout=nil, &blk)
  @cmd  = cmd
  @timeout = timeout
  @errback = blk
end

Class Method Details

.execute(cmd, timeout = nil, *args) ⇒ Object 



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# File 'lib/base/backup.rb', line 200

def self.execute(cmd, timeout = nil, *args)
  errb = args.pop if args.last.is_a? Proc
  instance = self.new(cmd, timeout, &errb)
  instance.run
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/base/backup.rb', line 172

def run
  pid = fork
  if pid
    # parent process
    success = false
    begin
      success = Timeout::timeout(@timeout) do
        Process.waitpid(pid)
        value = $?.exitstatus
        @errback.call(@cmd, value, "No message.") if value != 0 && @errback
        return value == 0
      end
    rescue Timeout::Error
      Process.detach(pid)
      Process.kill("KILL", pid)
      @errback.call(@cmd, -1, "Killed due to timeout.") if @errback
      return false
    end
  else
    begin
      # child process
      exec(@cmd)
    rescue => e
      exit!
    end
  end
end