Bootstrap a chroot environment.

bootstrap.sh

#!/usr/bin/env bash

# Root for debootstrap
ROOT=$1
# apt-cacher-ng location
PROXY=http://127.0.0.1:3142

# Unmount and drop the bootstrap location.
umount ${ROOT}/*
rm -rf ${ROOT}

# Bootstrap 
debootstrap xenial ${ROOT} ${PROXY}/ubuntu

# Put the apt-cacher-ng proxy into the appropriate place.
echo "Acquire::http::Proxy \"${PROXY}\";" > ${ROOT}/etc/apt/apt.conf.d/80proxy

# Copy the full sources file over.
cp /etc/apt/sources.list ${ROOT}/etc/apt/sources.list 

# Mounts
mount -t proc proc ${ROOT}/proc/
mount -t sysfs sys ${ROOT}/sys/
mount -o bind /dev ${ROOT}/dev/

# Update and upgrade
chroot ${ROOT} apt-get update
chroot ${ROOT} apt-get upgrade -y
# Housekeeping.
chroot ${ROOT} locale-gen en_US en_US.UTF-8
chroot ${ROOT} echo "LC_ALL=\"en_US.UTF-8\"" > /etc/default/locale
chroot ${ROOT} echo "LC_ALL=\"en_US.UTF-8\"" >> /etc/environment
chroot ${ROOT} echo "America/Detroit" > /etc/timezone

# Drop into new environment
chroot ${ROOT} su -