#!/bin/bash

# summary of how this script can be called:
#        * <new-preinst> `install'
#        * <new-preinst> `install' <old-version>
#        * <new-preinst> `upgrade' <old-version>
#        * <old-preinst> `abort-upgrade' <new-version>
# for details, see https://www.debian.org/doc/debian-policy/ or
# the debian-policy package

set -e # fail on any error

PROJECT=armaconsole

# USERS CONFIG
PROJECT_USER="${PROJECT}"
PROJECT_GROUP="www-data"
SUDOERS_FILE_PATH="/etc/sudoers.d/${PROJECT}"

# SYSTEMCTL CONFIG
SYSCTL_AMC_SERVICES="amcgunicorn amccelery amccelerybeat amccorrelator amclicense amcchecker amcvector"

# AMC DIRS
AMC_HOME="/usr/local/${PROJECT}"

# ======[ Trap Errors ]======#
set -E                        # let shell functions inherit ERR trap
trap err_handler 1 2 3 15 ERR # Trap non-normal exit signals: 1/HUP, 2/INT, 3/QUIT, 15/TERM, ERR
# shellcheck disable=SC2128
function err_handler() {
  local exit_status=${1:-$?}
  logger -s -p "syslog.err" -t "${PROJECT}.deb" \
    "${PROJECT}.deb script '$0' error code $exit_status (line $BASH_LINENO: '$BASH_COMMAND')"
  exit "$exit_status"
}

DEBUG_INSTALL="${DEBUG_INSTALL:-0}"
[ "$DEBUG_INSTALL" == "1" ] && set -x
[ "$DEBUG_INSTALL" == "1" ] && echo "Calling preinst $*"

set -u # treat unset variables as errors
case "$1" in
upgrade)
  # shellcheck disable=SC2086
  systemctl stop $SYSCTL_AMC_SERVICES || true
  # shellcheck disable=SC2086
  systemctl disable $SYSCTL_AMC_SERVICES || true
  ;;
install)
  # User
  id -g ${PROJECT_GROUP} &>/dev/null ||
    groupadd ${PROJECT_GROUP}
  id -u ${PROJECT_USER} &>/dev/null ||
    adduser --system --home "${AMC_HOME}" --no-create-home \
      --shell /bin/bash --ingroup "${PROJECT_GROUP}" --gecos "ARMA management console user" \
      "${PROJECT_USER}" &>/dev/null
  echo "${PROJECT_USER}     ALL=(ALL) NOPASSWD:ALL" >"${SUDOERS_FILE_PATH}"

  # Hosts
  echo "127.0.0.1 license-client elasticsearch vector armaconsole" >> /etc/hosts
  ;;
abort-upgrade) ;;
*)
  echo "preinst called with unknown argument \`$1'" >&2
  exit 1
  ;;
esac
exit 0