#! /bin/sh

APP_UPDATE_PATH="/var/opt/eset/efs/updated/app/efs.bin"
SYSTEMD_CAT="`which systemd-cat 2>/dev/null || true`"

print_error() {
	ERROR_PREFIX="ESET Server Security error:"

	# write per one line
	while read ERR; do
		if [ -n "$SYSTEMD_CAT" ]; then
			echo -n "$ERROR_PREFIX $ERR" | $SYSTEMD_CAT -t "efs" -p err
		else
			echo "$ERROR_PREFIX $ERR" 1>&2
		fi
	done
}

if [ ! -f "$APP_UPDATE_PATH" ]; then
	echo "Application update not found at $APP_UPDATE_PATH" | print_error
	exit 1
fi

# change control groups to system one (avoid problems with the product cgroup usage after uninstallation)
change_control_group_if_exists() {
	if [ -f "$1" ]; then
		echo $$ > "$1"
	fi
}

change_control_group_if_exists "/sys/fs/cgroup/systemd/system.slice/tasks"
change_control_group_if_exists "/sys/fs/cgroup/memory/system.slice/tasks"
change_control_group_if_exists "/sys/fs/cgroup/pids/system.slice/tasks"
change_control_group_if_exists "/sys/fs/cgroup/devices/system.slice/tasks"
change_control_group_if_exists "/sys/fs/cgroup/unified/cgroup.procs"
change_control_group_if_exists "/sys/fs/cgroup/cgroup.procs"

echo "Product upgrade in progress... Product will be started automatically when upgrade is finished."
TMP_DIR="`mktemp -d --tmpdir efs_app_update.XXXXXX`"
TMP_PKG_PATH="$TMP_DIR/efs.bin"

# move installation package to tmp dir to avoid starting upgrade second time
mv "$APP_UPDATE_PATH" "$TMP_PKG_PATH"

# set "State.Plugins.PCU.LastUpdRetval" to UPD_RETVAL_SETUP_ERROR
# and "State.Plugins.PCU.LastUpdRetvalIds" to IDS_UPDATE_TEXT_ERR_42 (Installation error)
set_pcu_state_to_error()
{
	/opt/eset/efs/sbin/cfg -i /dev/stdin > /dev/null <<HERE
	{
		"method": "_CE.rpc_api.screen_values_set",
		"params": {
			"values": {
				"Runtime.Plugins.PCU.State" : 0,
				"State.Plugins.PCU.LastUpdRetval" : 12802,
				"State.Plugins.PCU.LastUpdRetvalIds" : 234881095
			}
		}
	}
HERE
}

# detach from reinstallation process
cd "$TMP_DIR" && ( /bin/sh "$TMP_PKG_PATH" -y -f 2>&1 >/dev/null || set_pcu_state_to_error ) | print_error && rm -rf "$TMP_DIR" &