#!/bin/sh

[ "$(id -u)" -ne 0 ] && exec /usr/local/bin/sudo "${0}" "${@}"

echo -n "Saving configuration... "

if [ ! -f /etc/diskless ]
then
    echo "No flash setup detected."
    exit 1
fi

# Find all files newer than /etc/diskless and print them out
find_newer_files() {
  [ -d "${1}" ] || return 1
  find "${1}" -type f -not -regex '.*/tmp/*.' -newer /etc/diskless -print
}

# Archive all newer files into a gzipped cpio archive
archive_cpio() {
  [ -f "${2}" ] && return 1
  ( cd /; find_newer_files "${1}" | cpio -o --quiet | gzip -9 > "${2}" ) || return 1
}

# Archive specified files to named target
archive() {
  archive_cpio "${1}" "${2:-/conf/tmp/${1}}.cpio.gz" || return 1
}

# Mount /conf read-write, and upgrade to read-write if mounted read-only.
if grep -q /conf /etc/fstab
then
  _conf_mount=yes
  mount | grep -q /conf && _conf_mounted=yes
  mount | grep /conf | grep -q read-only && _conf_readonly=yes

  # Mount if unmounted
  [ ! "${_conf_mounted}" ] && mount -w /conf

  # Upgrade to read/write
  [ "${_conf_mounted}" -a "${_conf_readonly}" ] && mount -u -w /conf
fi

# Store config in temp staging area
rm -Rf /conf/tmp || exit 1
mkdir -p /conf/tmp || exit 1
chmod 750 /conf/tmp || exit 1

# Grab a list of confpacks to store
for pack in /conf/base/*/md_size
do
  pack="$(basename "$(dirname "${pack}")")"
  archive "${pack}" || exit 1
done

# Rotate current config to dated backup
# Unlimited history method: (make sure you have provisions for removing the old backups, or this can get HUGE!
dest="$(date -r "$(stat -f '%c' "/conf/default")" "+%Y-%m-%dT%H-%M-%S")"
mv /conf/default "/conf/backup/${dest}" || exit 1

# Move temp config to current
mv /conf/tmp /conf/default || mv "/conf/backup/${dest}" "/conf/default"

# Umount /conf afterwards, if it wasn't mounted
if [ "${_conf_mount}" ]
then
  # Unmount if it wasn't mounted
  [ ! "${_conf_mounted}" ] && umount /conf

  # Downgrade to read-only if it was read-only
  [ "${_conf_mounted}" -a "${_conf_readonly}" ] && mount -u -r -f /conf
fi

echo "Done!"