#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
# SPDX-PackageName: CISS.debian.installer
# SPDX-Security-Contact: security@coresecret.eu

guard_sourcing

#######################################
# Finalize the chroot system before exiting.
# Globals:
#   RECOVERY
#   TARGET
#   VAR_RUN_RECOVERY
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
final_commands() {
  ### Declare Arrays, HashMaps, and Variables.
  declare -r  var_logfile="/root/.ciss/cdi/log/4900_final_command.log"
  declare     var_target="${TARGET}"

  ### Check for TARGET / RECOVERY.
  [[ "${VAR_RUN_RECOVERY}" == "true" ]] && var_target="${RECOVERY}"

  chroot_logger "${var_target}${var_logfile}"

  chroot_script "${var_target}" "
    updatedb | tee -a ${var_logfile}
  "

  ciss_enforce_multi_user_target

  rm -f "${var_target}/root/ciss_xdg_tmp.sh"

  guard_dir && return 0
}
### Prevents accidental 'unset -f'.
# shellcheck disable=SC2034
readonly -f final_commands

#######################################
# description
# Globals:
#   RECOVERY
#   TARGET
#   VAR_RUN_RECOVERY
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
ciss_enforce_multi_user_target() {
  ### Declare Arrays, HashMaps, and Variables.
  declare     var_target="${TARGET}"

  ### Check for TARGET / RECOVERY.
  [[ "${VAR_RUN_RECOVERY}" == "true" ]] && var_target="${RECOVERY}"

  # shellcheck disable=SC2016
  chroot_script "${var_target}" '
    declare var_dm="" var_unit_dir="" var_link="/etc/systemd/system/default.target"

    ### Determine the canonical systemd unit dir inside TARGET.
    if [[ -d /lib/systemd/system ]]; then

      var_unit_dir=/lib/systemd/system

    elif [[ -d /usr/lib/systemd/system ]]; then

      var_unit_dir=/usr/lib/systemd/system

    fi

    ### Enforce default.target -> multi-user.target as a symlink.
    if [[ -e "${var_link}" ]] && [[ ! -L "${var_link}" ]]; then

      ### A regular file here is wrong; we remove it to avoid vendor fallback to graphical.
      rm -f -- "${var_link}"

    fi

    if [[ ! -L "${var_link}" ]]; then

      ln -s "${var_unit_dir}/multi-user.target" "${var_link}"

    else

      ### Ensure it points to multi-user.

      if [[ "$(readlink -f "${var_link}")" != "${var_unit_dir}/multi-user.target" ]]; then

        rm -f -- "${var_link}"
        ln -s "${var_unit_dir}/multi-user.target" "${var_link}"

      fi

    fi

    ### Hard-block any display manager (mask via /dev/null symlink). Include common DMs, and the generic alias:
    ary_dm_units=(
      "display-manager.service"
      "gdm.service"
      "gdm3.service"
      "sddm.service"
      "lightdm.service"
      "xdm.service"
      "lxdm.service"
      "slim.service"
    )

    for var_dm in "${ary_dm_units[@]}"; do

      if [[ ! -L "/etc/systemd/system/${var_dm}" ]]; then

        ln -s /dev/null "/etc/systemd/system/${var_dm}"

      fi

    done
  '

  return 0
}
### Prevents accidental 'unset -f'.
# shellcheck disable=SC2034
readonly -f ciss_enforce_multi_user_target
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh