Class: FPM::Dockery::Utils::Subprocess

Inherits:
Object
  • Object
show all
Extended by:
Logging
Defined in:
lib/fpm/dockery/utils.rb

Overview

A moderately decent way of dealing with running commands and coping with stdout/stderr

Class Method Summary collapse

Methods included from Logging

fatal, info, warn

Class Method Details

.run(cmd, &block) ⇒ Object 



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# File 'lib/fpm/dockery/utils.rb', line 9

def self.run(cmd, &block)
  info "Running command '#{cmd}'"
  log_command = "#{cmd.split(' ')[0]}"
  # see: http://stackoverflow.com/a/1162850/83386
  Open3.popen3(cmd) do |stdin, stdout, stderr, thread|
    # read each stream from a new thread
    { :out => stdout, :err => stderr }.each do |key, stream|
      Thread.new do
        until (line = stream.gets).nil? do
          # yield the block depending on the stream
          if key == :out
            info("[#{log_command}] [stdout] #{line.chomp}") unless line.nil?
          else
            info("[#{log_command}] [stderr] #{line.chomp}") unless line.nil?
          end
        end
      end
    end
    
    thread.join # don't exit until the external process is done
    return thread.value
  end
end