Startup script for magic spellbook home automation with a Raspberry Pi kiosk and home-assistant.io

spellbook-startup.sh

#!/bin/bash
#
# ARG_POSITIONAL_SINGLE([home-assistant-address],[root URL of home assistant])
# ARG_OPTIONAL_BOOLEAN([tvservice],[],[tvservice on],[on])
# ARG_OPTIONAL_BOOLEAN([usb],[],[USB on],[on])
# ARGBASH_GO()
# needed because of Argbash --> m4_ignore([
### START OF CODE GENERATED BY Argbash v2.8.1 one line above ###
# Argbash is a bash code generator used to get arguments parsing right.
# Argbash is FREE SOFTWARE, see https://argbash.io for more info
# Generated online by https://argbash.io/generate


die()
{
  local _ret=$2
  test -n "$_ret" || _ret=1
  test "$_PRINT_HELP" = yes && print_help >&2
  echo "$1" >&2
  exit ${_ret}
}


begins_with_short_option()
{
  local first_option all_short_options=''
  first_option="${1:0:1}"
  test "$all_short_options" = "${all_short_options/$first_option/}" && return 1 || return 0
}

# THE DEFAULTS INITIALIZATION - POSITIONALS
_positionals=()
# THE DEFAULTS INITIALIZATION - OPTIONALS
_arg_tvservice="on"
_arg_usb="on"


print_help()
{
  printf 'Usage: %s [--(no-)tvservice] [--(no-)usb] <home-assistant-address>\n' "$0"
  printf '\t%s\n' "<home-assistant-address>: root URL of home assistant"
  printf '\t%s\n' "--tvservice, --no-tvservice: tvservice on (on by default)"
  printf '\t%s\n' "--usb, --no-usb: USB on (on by default)"
}


parse_commandline()
{
  _positionals_count=0
  while test $# -gt 0
  do
    _key="$1"
    case "$_key" in
      --no-tvservice|--tvservice)
        _arg_tvservice="on"
        test "${1:0:5}" = "--no-" && _arg_tvservice="off"
        ;;
      --no-usb|--usb)
        _arg_usb="on"
        test "${1:0:5}" = "--no-" && _arg_usb="off"
        ;;
      *)
        _last_positional="$1"
        _positionals+=("$_last_positional")
        _positionals_count=$((_positionals_count + 1))
        ;;
    esac
    shift
  done
}


handle_passed_args_count()
{
  local _required_args_string="'home-assistant-address'"
  test "${_positionals_count}" -ge 1 || _PRINT_HELP=yes die "FATAL ERROR: Not enough positional arguments - we require exactly 1 (namely: $_required_args_string), but got only ${_positionals_count}." 1
  test "${_positionals_count}" -le 1 || _PRINT_HELP=yes die "FATAL ERROR: There were spurious positional arguments --- we expect exactly 1 (namely: $_required_args_string), but got ${_positionals_count} (the last one was: '${_last_positional}')." 1
}


assign_positional_args()
{
  local _positional_name _shift_for=$1
  _positional_names="_arg_home_assistant_address "

  shift "$_shift_for"
  for _positional_name in ${_positional_names}
  do
    test $# -gt 0 || break
    eval "$_positional_name=\${1}" || die "Error during argument parsing, possibly an Argbash bug." 1
    shift
  done
}

parse_commandline "$@"
handle_passed_args_count
assign_positional_args 1 "${_positionals[@]}"

# OTHER STUFF GENERATED BY Argbash

### END OF CODE GENERATED BY Argbash (sortof) ### ])
# [ <-- needed because of Argbash

# Trick Chromium into thinking everything exited cleanly
sed -i 's/"exited_cleanly": false/"exited_cleanly": true/' ~/.config/chromium/Default/Preferences

# Start unclutter (hide mouse)
unclutter -idle 0.5 -root &

# Turn off USB/ethernet (for security & power saving)
if [[ "$_arg_usb" == "off" ]]; then
  usb_flag="0"
else
  usb_flag="1"
fi
echo "Turning USB/ethernet $_arg_usb"
echo "${usb_flag}" | sudo tee /sys/devices/platform/soc/3f980000.usb/buspower >/dev/null

# Turn off HDMI
if [[ "$_arg_tvservice" == "off" ]]; then
  echo "Turning TV service off."
  sudo tvservice --off
fi

# Determine the room-name from the hostname
ROOM=$(hostname | sed -e "s/spellbook-//g")

# Start chromium
URL="$_arg_home_assistant_address/lovelace/${ROOM:-}?kiosk"
echo "Opening chromium to $URL"
/usr/bin/chromium-browser --noerrdialogs --disable-infobars --ignore-certificate-errors --kiosk "--app=$URL" &

# ] <-- needed because of Argbash