Class: IscsiadmWrapper::External

Inherits:
Object
  • Object
show all
Defined in:
lib/iscsiadm/external.rb

Defined Under Namespace

Classes: ExternalFailure

Class Method Summary collapse

Class Method Details

.cmd(cmd) ⇒ Object

Execute a command, returning the resulting String of standard output.

The block is optional. If given, it will be invoked for each line of output.



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# File 'lib/iscsiadm/external.rb', line 13

def cmd(cmd)
  output = []
  error = nil
  stat = Open4::popen4(cmd) do |pid, stdin, stdout, stderr|
    while line = stdout.gets
      output << line 
    end
    error = stderr.read.strip
  end
  if stat.exited?
    if stat.exitstatus > 0
      raise ExternalFailure, "Fatal error, `#{cmd}` returned #{stat.exitstatus} with '#{error}'"
    end
  elsif stat.signaled?
    raise ExternalFailure, "Fatal error, `#{cmd}` got signal #{stat.termsig} and terminated"
  elsif stat.stopped?
    raise ExternalFailure, "Fatal error, `#{cmd}` got signal #{stat.stopsig} and is stopped"
  end

  if block_given?
    return output.each { |l| yield l }
  else 
    return output.join
  end
end