Allow to use Xvfb started as root about headless HOT 2 CLOSED

So you're saying that it's not necessary to check if the PID file is accessible, we only need the X11 socket? But then you only need to set ENV['DISPLAY'] for X apps to work, possibly even outside of the Ruby code. Why use headless?

from headless.

The way that we use headless is pretty interesting. We have set it up for Cucumber + WebDriver and its logic is the following:

1. On Mac, ignore Xvfb and start up browser normally.
2. On Linux desktops, start browser in Xvfb so its window doesn't bother during development.
3. On Linux without X11 (Vagrant), start browser using /etc/init.d/xvfb running service rather than "headless" gem and allow to view the tests via x11vnc (which requires Xvfb to be running before itself). This applies to tests running in 1 process.
4. On Linux without X11, when tests are being run in parallel processes, start new Xvfb instance for each process using "headless" gem.

Point 3 doesn't work for us, since headless cannot connect to run by root Xvfb instance.

The code we use to achieve this:

require 'headless'
displays = ENV['TEST_ENV_NUMBER'].to_i..ENV['TEST_ENV_NUMBER'].to_i + 100
def displays.to_i
  self
end

begin
  Headless.new(
    display: displays,
    reuse: true,
    destroy_at_exit: false
  ).start
rescue Headless::Exception
  puts 'Xvfb not found on your system, keeping calm'
end

from headless.