#!/bin/sh

FIRMWARE="$1"
shift
BACKUP_FILES="$@"

[ ! "$DO_NOT_BACKUP" ] && KEEP_LISTS="$(uci -q get lime-autogen.system.keep_on_upgrade)"

BACKUP_ARCHIVE="/tmp/upgrade.tar.gz"
BACKUP_EXTRA_DIR="/tmp/lime-sysupgrade/preserve/"

add_file() {
  for l in `cat $1 | sed -e s/#.*$// -e /^$/d`; do
    [ -e "$l" ] && BACKUP_FILES="$BACKUP_FILES $l" || true
  done
}

usage() {
  echo "Usage: lime-sysupgrade <firmware> [backup_file1 backup_file2 ...]"
  echo "Use system variable FORCE=1 for not being asked for confirmation"
  echo "Use DO_NOT_BACKUP=1 to disable 'lime-autogen.system.keep_on_upgrade' file lists"
  echo "The content of /tmp/lime-sysupgrade/preserve/ will be also backup"
  echo ""
  echo "In addition to the user specified backup files, the content of the following lists will also be included:"
  for f in $KEEP_LISTS; do
    echo $f | grep -q '/' && echo " -> $f" || echo " -> /lib/upgrade/keep.d/$f"
  done
  exit 1
}

[ ! -f "$FIRMWARE" ] && usage

for f in $KEEP_LISTS; do
  echo "$f" | grep -q '/' && file="$f" || file="/lib/upgrade/keep.d/$f"
  [ -f "$file" ] && add_file $file || echo "Warning: Cannot read $file file"
done

rm -f $BACKUP_ARCHIVE

if [ -d "$BACKUP_EXTRA_DIR" ] ; then
    cd $BACKUP_EXTRA_DIR
    tar cvfz $BACKUP_ARCHIVE -C $BACKUP_EXTRA_DIR * $BACKUP_FILES || exit 1
    cd -
elif [ -n "$BACKUP_FILES" ] ; then
    tar czf $BACKUP_ARCHIVE $BACKUP_FILES || exit 1
fi

echo "Upgrading the system..."
echo ""
echo "Files to be saved"
echo "------------------"
[ -e $BACKUP_ARCHIVE ] && tar tvfz $BACKUP_ARCHIVE
echo "------------------"
echo ""
echo "The device model is $(cat /tmp/sysinfo/model)"
echo "The md5sum of the new firmware is $(md5sum $FIRMWARE | awk '{print $1}')"
command -v sha256sum &> /dev/null && echo "Its sha256sum is $(sha256sum $FIRMWARE | awk '{print $1}')" || true
echo "Ready to perform the upgrade. Press [ENTER] to continue or CTRL+C to cancel"
[ "$FORCE" == "1" ] || read
echo ""

if safe-upgrade board-supported > /dev/null 2>&1; then
    [ -e "$BACKUP_ARCHIVE" ] && OPTIONS="--preserve-archive $BACKUP_ARCHIVE" || OPTIONS="-n"
    safe-upgrade upgrade $OPTIONS $FIRMWARE
else
    [ -e "$BACKUP_ARCHIVE" ] && OPTIONS="-f $BACKUP_ARCHIVE" || OPTIONS="-n"
    sysupgrade $OPTIONS $FIRMWARE &
fi