gistfile1.txt

module Linux
  module User
    
    def self.syscall(cmd_str,success_retval=nil,dryrun_opts=nil)
      return dryrun_opts if dryrun_opts
      
      outputs = Hash.new
      Open3.popen3(cmd_str) do |stdin,stdout,stderr,wait_thr|
        outputs[:stdout]   = stdout.read
        outputs[:stderr]   = stderr.read
        outputs[:wait_thr] = wait_thr
      end
      
      raise_str = <<-STR
Command: \'#{cmd_str}\' failed!
Exitstatus => #{outputs[:wait_thr].value}
Stderr => #{outputs[:stderr]}
STR
      
      if success_retval
        unless outputs[:wait_thr].value.exitstatus == success_retval
          raise raise_str
        end
      elsif not outputs[:wait_thr].value.success?
        raise raise_str
      end
      outputs
    end
    
  end
end