Use debootstrap to create a chroot that can be turned into a vagrant-compatible (virtualbox, wheezy 32) VM

debootstrap-vagrant

#!/bin/bash

DIR=${1?usage: $0 <dir>}
NAME=${DIR##*/}

set -e -x

rm -rf "$DIR"

trap 'set +e; umount "$DIR/proc"; umount "$DIR/sys"; rm -rf "$DIR"' EXIT INT
debootstrap --variant=minbase --arch=i386 --include=linux-image-686-pae,extlinux,acpi-support-base,isc-dhcp-client,sudo,openssh-server,ifupdown,virtualbox-guest-utils wheezy "$DIR" http://ftp.us.debian.org/debian

cat > "$DIR"/boot/syslinux.cfg <<END
DEFAULT linux
LABEL linux
  KERNEL /boot/vmlinuz-3.2.0-4-686-pae
  INITRD /boot/initrd.img-3.2.0-4-686-pae
  APPEND ro root=/dev/sda1
END

echo "$NAME" > "$DIR/etc/hostname"
chroot "$DIR" /bin/sh -c '
set -e -x
: basic config
echo "UseDNS no" >> /etc/ssh/sshd_config
echo "auto eth0" >> /etc/network/interfaces
echo "iface eth0 inet dhcp" >> /etc/network/interfaces
: vagrant user setup
adduser --disabled-password --gecos "" vagrant
mkdir -m 0700 /home/vagrant/.ssh
echo "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ== vagrant insecure public key" > /home/vagrant/.ssh/authorized_keys
chmod 0600 /home/vagrant/.ssh/authorized_keys
chown -R vagrant:vagrant /home/vagrant
: root and sudo setup
echo "vagrant:vagrant" | chpasswd
echo "root:vagrant" | chpasswd
echo "vagrant ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/10_vagrant
chmod 0400 /etc/sudoers.d/10_vagrant
'
trap '' EXIT INT