Method: Puppet::FileSystem::FileImpl#exclusive_open

Defined in:
lib/puppet/file_system/file_impl.rb

#exclusive_open(path, mode, options = 'r', timeout = 300, &block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/puppet/file_system/file_impl.rb', line 52

def exclusive_open(path, mode, options = 'r', timeout = 300, &block)
  wait = 0.001 + (Kernel.rand / 1000)
  written = false
  until written
    ::File.open(path, options, mode) do |rf|
      if rf.flock(::File::LOCK_EX | ::File::LOCK_NB)
        Puppet.debug { _("Locked '%{path}'") % { path: path } }
        yield rf
        written = true
        Puppet.debug { _("Unlocked '%{path}'") % { path: path } }
      else
        Puppet.debug { "Failed to lock '%s' retrying in %.2f milliseconds" % [path, wait * 1000] }
        sleep wait
        timeout -= wait
        wait *= 2
        if timeout < 0
          raise Timeout::Error, _("Timeout waiting for exclusive lock on %{path}") % { path: path }
        end
      end
    end
  end
end