output.txt

brian@localghost:vagrant-sandbox % HELLO="hello" be vagrant up bork                                      ±[●][master]
Bringing machine 'bork' up with 'virtualbox' provider...
==> bork: Running triggers before up ...
==> bork: Running trigger...
hi
hello
==> bork: Cloning VM...
==> bork: Matching MAC address for NAT networking...
==> bork: Checking if box 'bento/ubuntu-18.04' is up to date...
==> bork: Setting the name of the VM: vagrant-sandbox_bork_1539892258393_75645
==> bork: Fixed port collision for 22 => 2222. Now on port 2200.
==> bork: Clearing any previously set network interfaces...
==> bork: Preparing network interfaces based on configuration...
    bork: Adapter 1: nat
==> bork: Forwarding ports...
    bork: 22 (guest) => 2200 (host) (adapter 1)
==> bork: Booting VM...
==> bork: Waiting for machine to boot. This may take a few minutes...
    bork: SSH address: 127.0.0.1:2200
    bork: SSH username: vagrant
    bork: SSH auth method: private key
    bork:
    bork: Vagrant insecure key detected. Vagrant will automatically replace
    bork: this with a newly generated keypair for better security.
    bork:
    bork: Inserting generated public key within guest...
    bork: Removing insecure key from the guest if it's present...
    bork: Key inserted! Disconnecting and reconnecting using new SSH key...
==> bork: Machine booted and ready!
==> bork: Checking for guest additions in VM...
==> bork: Setting hostname...
==> bork: Mounting shared folders...
    bork: /vagrant => /home/brian/code/vagrant-sandbox
==> bork: Running provisioner: shell...
    bork: Running: inline script
    bork: hello

Vagrantfile

Vagrant.configure("2") do |config|
  config.vm.define "bork" do |b|
    b.vm.box = "bento/ubuntu-18.04"
    b.vm.hostname = "test.test"

    b.trigger.before :up do |t|
      hostname = ENV["HELLO"]
      t.ruby do |env,machine|
        puts "hi"
        puts hostname
      end
      b.vm.hostname = hostname
    end

    b.vm.provision "shell", inline:<<-SHELL
    hostname -f
    SHELL
  end
end