vagrant/plugins/kernel_v2/config/ssh.rb

require "vagrant"

module VagrantPlugins
  module Kernel_V2
    class SSHConfig < Vagrant.plugin("2", :config)
      attr_accessor :username
      attr_accessor :password
      attr_accessor :host
      attr_accessor :port
      attr_accessor :guest_port
      attr_accessor :max_tries
      attr_accessor :timeout
      attr_accessor :private_key_path
      attr_accessor :forward_agent
      attr_accessor :forward_x11
      attr_accessor :shell

      def validate(machine)
        errors = []

        [:username, :max_tries, :timeout].each do |field|
          value = instance_variable_get("@#{field}".to_sym)
          errors << I18n.t("vagrant.config.common.error_empty", :field => field) if !value
        end

        if private_key_path && \
          !File.file?(File.expand_path(private_key_path, machine.env.root_path))
          errors << I18n.t("vagrant.config.ssh.private_key_missing", :path => private_key_path)
        end

        # Return the errors
        { "ssh" => errors }
      end
    end
  end
end