start

#!/bin/bash

SYSTEMCTL_PY="systemctl3.py"

get_cmd(){
  local cmd="$1"
  command -v "$cmd" || printf "${0%/*}/$cmd"
}

SYSTEMCTL=$(get_cmd $SYSTEMCTL_PY)
UNCHROOT=$(get_cmd unchroot)
COMMAND="${0##*/}"
SYSTEM_BIN=/system/bin

[ -n "$2" ] && shift

out() { printf "$1 $2\n" "${@:3}"; }
error() { out "==> ERROR:" "$@"; } >&2
die() { error "$@"; exit 1; }

usage() {
cat <<EOF
$COMMAND [OPTIONS...] COMMAND

Send $COMMAND commands to the Host, or stop this Chroot Container.

Applet
EOF
case $COMMAND in
    reboot|poweroff|halt|shutdown)	cat <<EOF
    reboot|poweroff|halt|shutdown
                 Send $COMMAND commands to the Host,
                 and Stop this Chroot Container
EOF
    ;;
    *)				                      cat <<EOF
    $COMMAND     Send $COMMAND commands to the Host
EOF
    ;;
esac
cat <<EOF
Options:
     --help      Show this help

This is a fake $COMMAND script, See $(readlink -f ${0}) file for details.

EOF
exec $UNCHROOT $COMMAND --help
}

umount_dest(){
  [ -n "$dest" ] && mountpoint -q "$dest" && umount -l $dest
  out "\033[37m[\033[0m\033[0;32m  OK  \033[0m\033[37m] Umounted\033[0m $dest"
}

umount_fstab() {
  while read src dest fstype opts dump pass; do
    umount_dest
  done <<< "$(grep -vE '^\s*(#|$)' /etc/fstab)"
}

unchroot(){
  if [ -x /bin/bash ] ;then
    $UNCHROOT ${@}
  else
    error unchroot: command not found: bash
  fi
}

system_command(){
  unchroot "$SYSTEM_BIN/$@"
}

system_halt(){
  $SYSTEMCTL halt
  umount_fstab
}

case $1 in
  -h|--help)  usage && exit 0 ;;
  *)                          ;;
esac

[ "$(id -u)" -ne 0 ] && die "This script must be run with root privileges"

case $COMMAND in
  reboot|poweroff|halt|shutdown)
    system_command $COMMAND $@
    system_halt               ;;
  *)
    system_command $COMMAND $@;;
esac