gistfile1.sh

#!/bin/sh
set -e

IMAGE="image.bin"
DISK="coreos.vdi"
VM_NAME="CoreOS"

# Delete any existing VDI
rm -f $DISK

# Convert the raw image to a disk for VirtualBOx
VBoxManage convertfromraw $IMAGE $DISK

# Create a new VM to house this disk
VBoxManage createvm --name $VM_NAME --ostype 'Oracle_64' --register
VBoxManage modifyvm $VM_NAME --boot1 disk --boot2 dvd --boot3 none --boot4 none
VBoxManage modifyvm $VM_NAME --cpus 1
VBoxManage modifyvm $VM_NAME --memory 512

# Create the IDE controller so we can attach the disk
VBoxManage storagectl $VM_NAME --name 'IDE Controller' --add ide
VBoxManage storageattach $VM_NAME \
    --storagectl 'IDE Controller' \
    --port 0 --device 0 \
    --type hdd \
    --medium $DISK

# Create the Vagrantfile to package with the box
cat << 'EOF' > Vagrantfile.pkg
Vagrant.configure("2") do |config|
  # SSH in as the 'core' user since that is recommended with CoreOS
  config.ssh.username = "core"

  # Disable the base shared folder so that no guest additions are required
  config.vm.synced_folder ".", "/vagrant", disabled: true
end
EOF

# Export the machine
vagrant package --base $VM_NAME \
    --output 'coreos.box' --Vagrantfile Vagrantfile.pkg

# Clean up the VM, we don't need it anymore. This will also delete our
# disk image.
VBoxManage unregistervm $VM_NAME --delete