#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-10-11; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.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: LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1
# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
# SPDX-PackageName: CISS.debian.live.builder
# SPDX-Security-Contact: security@coresecret.eu
set -Ceuo pipefail

printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"

declare var_dm="" var_unit_dir="" var_link="/etc/systemd/system/default.target"

### Remove CDLB artifacts ------------------------------------------------------------------------------------------------------
rm -f  /root/ciss_xdg_tmp.sh
rm -fr /root/build
find /etc /home /root /usr /var -type f -name '.keep' -print -delete

### Securing '/root/.ciss' ----------------------------------------------------------------------------------------------------------
find /root/.ciss -type d -exec chmod 0700 {} +
find /root/.ciss -type f -exec chmod 0440 {} +

### Securing '/etc/ciss/keys' --------------------------------------------------------------------------------------------------
find /etc/ciss/keys -type f -exec chmod 0440 {} +

### Regenerate the initramfs for the live system kernel ------------------------------------------------------------------------
update-initramfs -u -k all -v

### Determine the canonical systemd unit dir inside chroot ---------------------------------------------------------------------
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.
  # shellcheck disable=SC2312
  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

printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"

exit 0
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh