Module: ImageOptim::Cmd

Defined in:
lib/image_optim/cmd.rb

Overview

Helper for running commands

Defined Under Namespace

Classes: TimeoutExceeded

Class Method Summary collapse

Class Method Details

.capture(cmd) ⇒ Object

Run using backtick Return captured output Will raise SignalException if process was interrupted



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# File 'lib/image_optim/cmd.rb', line 63

def capture(cmd)
  output = `#{cmd}`

  check_status!

  output
end

.run(*args) ⇒ Object

Run using ‘system` Return success status Will raise SignalException if process was interrupted



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# File 'lib/image_optim/cmd.rb', line 13

def run(*args)
  success = system(*args)

  check_status!

  success
end

.run_with_timeout(timeout, *args) ⇒ Object

Run the specified command, and kill it off if it runs longer than ‘timeout` seconds.

Return success status Will raise an error when command timeouts



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# File 'lib/image_optim/cmd.rb', line 34

def run_with_timeout(timeout, *args)
  return run(*args) unless timeout > 0 && support_timeout?

  success = false
  init_options!(args)

  begin
    stdin, stdout, thread = Open3.popen2(*args)
    stdin.close
    stdout.close

    pid = thread[:pid]

    if thread.join(timeout).nil?
      cleanup_process(pid)
      thread.kill
      fail TimeoutExceeded
    else
      status = thread.value.exitstatus
      success = status.zero? if status
    end
  end

  success
end

.support_timeout? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/image_optim/cmd.rb', line 21

def support_timeout?
  if defined?(JRUBY_VERSION)
    JRUBY_VERSION >= '9.0.0.0'
  else
    RUBY_VERSION >= '1.9'
  end
end