#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-02-13; WEIDNER, Marc S.; <cendev@coresecret.eu>
# SPDX-ExternalRef: GIT https://cendev.eu/marc.weidner/CISS.2025.debian.installer.git
# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <cendev@coresecret.eu>
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
# SPDX-LicenseComment: This file is part of the CISS.2025.hardened.installer framework.
# SPDX-PackageName: CISS.2025.hardened.installer
# SPDX-Security-Contact: security@coresecret.eu

###########################################################################################
# Mounting '/dev/mapper/crypt_rescue', debootstrap recovery partition, preparing chroot.
# Globals:
#   ERR_CHROOT_MOUNTS
#   ERR_DE_BOOT_STRAP
#   MODULE_ERR
#   MODULE_TXT
#   RECOVERY
#   TARGET
# Arguments:
#   None
###########################################################################################
setup_recovery() {

  # The '/dev/mapper/crypt_rescue' partition is not mounted by the installation script by default,
  # as it is not required to be automatically mounted by the production system via '/etc/crypttab' and '/etc/fstab'.
  mount /dev/mapper/crypt_rescue "${RECOVERY}"

  # Debootstrap for a minimalistic Debian OS.
  if debootstrap --arch amd64 bookworm "${RECOVERY}" https://deb.debian.org/debian; then
    do_log "info" "file_only" "Executing 'debootstrap --arch amd64 bookworm '${RECOVERY}' https://deb.debian.org/debian' successful."
  else
    do_log "emergency" "file_only" "Executing 'debootstrap --arch amd64 bookworm '${RECOVERY}' https://deb.debian.org/debian' NOT successful."
    exit "${ERR_DE_BOOT_STRAP}"
  fi

  ### Reminder ###
  # --rbind: recursive binding.
  # --make-rslave: In this case, the mount point is marked as 'slave'.
  # This means changes to the source mount (e.g., /proc) are propagated to the target mount (e.g., "${TARGET}"/proc).
  # Conversely, changes to the target mount are not propagated back to the source mount.
  # This mode is necessary to avoid problems with double or erroneous propagation effects in chroot or container environments.

  # Prepare the freshly installed Debian OS recovery system for further setup.
  if mount --make-rslave --rbind /proc "${RECOVERY}"/proc; then
    do_log "info" "file_only" "'mount --make-rslave --rbind /proc ${RECOVERY}/proc'."
  else
    do_log "emergency" "file_only" "Failed: 'mount --make-rslave --rbind /proc ${RECOVERY}/proc'."
    exit "${ERR_CHROOT_MOUNTS}"
  fi

  if mount --make-rslave --rbind /sys "${RECOVERY}"/sys; then
    do_log "info" "file_only" "'mount --make-rslave --rbind /sys ${RECOVERY}/sys'."
  else
    do_log "emergency" "file_only" "Failed: 'mount --make-rslave --rbind /sys ${RECOVERY}/sys'."
    exit "${ERR_CHROOT_MOUNTS}"
  fi

  if mount --make-rslave --rbind /dev "${RECOVERY}"/dev; then
    do_log "info" "file_only" "'mount --make-rslave --rbind /dev ${RECOVERY}/dev'."
  else
    do_log "emergency" "file_only" "Failed: 'mount --make-rslave --rbind /dev ${RECOVERY}/dev'."
    exit "${ERR_CHROOT_MOUNTS}"
  fi

  if mount --make-rslave --rbind /run "${RECOVERY}"/run; then
    do_log "info" "file_only" "'mount --make-rslave --rbind /run ${RECOVERY}/run'."
  else
    do_log "emergency" "file_only" "Failed: 'mount --make-rslave --rbind /run ${RECOVERY}/run'."
    exit "${ERR_CHROOT_MOUNTS}"
  fi

  if do_in_target "${TARGET}" mkdir -p /etc/systemd/system/multi-user.target.wants; then
    do_log "info" "file_only" "Command: 'mkdir -p /etc/systemd/system/multi-user.target.wants' executed in: '${RECOVERY}'."
  else
    do_log "emergency" "file_only" "Failed: Command: 'mkdir -p /etc/systemd/system/multi-user.target.wants' executed in: '${RECOVERY}'."
  fi

  do_show_footer "${MODULE_TXT}"
}
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