Centos7x: guest additions workaround

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

##
## variables
##
## Note: multiple vagrant plugins follow the following syntax:
##
##       required_plugins = %w(plugin1 plugin2 plugin3)
##
required_plugins           = %w(vagrant-vbguest)
plugin_installed           = false
project_root               = '/vagrant'

## create vbox machines
Vagrant.configure(2) do |config|
    ## shared files + folders
    config.vm.define 'gnome-test' do |node|
        ## virtualbox configurations
        node.vm.box = 'centos/7'
        node.vm.hostname = 'gnome-test'

        ##
        ## utility executable: install docker + rancher-cli
        ##
        ## Note: reinstall guest additions per vbox:
        ##
        ##     - https://forums.virtualbox.org/viewtopic.php?f=3&t=89084#p438514
        ##
        node.vm.provision 'shell', inline: <<-SHELL
            ## install kernel
            yum install -y https://people.centos.org/toracat/kernel/7/plus/bug15570new/kernel-3.10.0-957.1.3.bug15570.plus.el7.x86_64.rpm

            ## uninstall guest additions
            cd /media
            cd VBOXADDITIONS_*
            sudo sh VBoxLinuxAdditions.run uninstall

            ## install guest additions
            yum update -y
            yum groupinstall -y 'Development Tools'
            yum install -y kernel-devel epel-release dkms
            mkdir -p /mnt/VBoxLinuxAdditions
            mount /dev/cdrom /mnt/VBoxLinuxAdditions
            sh /mnt/VBoxLinuxAdditions/VBoxLinuxAdditions.run

            ## install gnome desktop
            yum -y groupinstall 'GNOME Desktop'
            systemctl set-default graphical.target
            systemctl start graphical.target
        SHELL
    end
end