#!/bin/bash

#build the debian rootfs

set -e
if [ "$DEBUG" ]; then
  set -x
fi

. ./common.sh

if [ "$EUID" -ne 0 ]; then
  echo "This script must be run as root."
  exit 1
fi

if [ -z "$2" ]; then
  echo "Usage: ./build_rootfs.sh rootfs_path release_name"
  echo "Valid named arguments (specify with 'key=value'):"
  echo "  custom_packages - The packages that will be installed in place of task-xfce-desktop."
  echo "  hostname        - The hostname for the new rootfs."
  echo "  root_passwd     - The root password."
  echo "  username        - The unprivileged user name for the new rootfs."
  echo "  user_passwd     - The password for the unprivileged user."
  echo "If you do not specify the hostname and credentials, you will be prompted for them later."
  exit 1
fi

assert_deps "realpath debootstrap"
parse_args "$@"

rootfs_dir=$(realpath -m "${1}")
release_name="${2}"
packages="${args['custom_packages']-'task-xfce-desktop'}"
chroot_mounts="proc sys dev run"

mkdir -p $rootfs_dir

unmount_all() {
  for mountpoint in $chroot_mounts; do
    umount -l "$rootfs_dir/$mountpoint"
  done
}

debootstrap --arch amd64 $release_name $rootfs_dir http://deb.debian.org/debian/
cp -ar rootfs/* $rootfs_dir
cp /etc/resolv.conf $rootfs_dir/etc/resolv.conf

trap unmount_all EXIT
for mountpoint in $chroot_mounts; do
  mount --make-rslave --rbind "/${mountpoint}" "${rootfs_dir}/$mountpoint"
done

hostname="${args['hostname']}"
root_passwd="${args['root_passwd']}"
username="${args['username']}"
user_passwd="${args['user_passwd']}"

chroot_command="/opt/setup_rootfs.sh '$DEBUG' '$release_name' '$packages' '$hostname' '$root_passwd' '$username' '$user_passwd'"
chroot $rootfs_dir /bin/bash -c "${chroot_command}"
trap - EXIT
unmount_all

echo "rootfs has been created"