Evrone::Common::Spawn

This gem helps to spawn processes in a shell capturing output in realtime. It also allows to set the temeouts.

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Requirements

MRI 1.9.3 or 2.0.0.

Installation

Add this line to your application's Gemfile:

gem 'evrone-common-spawn'

And then execute the bundler:

$ bundle

Or install it via gem command:

$ gem install evrone-common-spawn

Quick Start

The following snippet demonstrates the usage:

# Spawn system processes example

include Evrone::Common::Spawn

spawn "ls -la" do |output|
  print output
  # prints directory listing
end

spawn({'ENV_VAR' => 'VALUE'}, "echo $VALUE", timeout: 10) do |output|
  print output
  #  its print "VALUE\n"
end

# Spawn remote processes example

open_ssh('localhost', 'user') do |ssh|
  ssh.spawn("ls -la") do |output|
    print output
    # prints directory listing
  end

  spawn({'ENV_VAR' => 'VALUE'}, "echo $VALUE", read_timeout: 10) do |output|
    print output
    #  its print "VALUE\n"
  end
end

Timeouts

When a timeout is reached spawn raises Evrone::Common::Spawn::TimeoutError or Evrone::Common::Spawn::ReadTimeoutError. Both exceptions inherit from Timeout::Error

Return values

Both spawn methods return process exit code. If a process was terminated by a signal, for example KILL or INT, the methods return negative number identical to a signal number (-9 for KILL, etc.)

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request