#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-05-05; 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

guard_sourcing || return "${ERR_GUARD_SRCE}"

#######################################
# Removes secrets securely before 'lb build' execution.
# Globals:
#   BASH_SOURCE
#   VAR_TMP_SECRET
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
x_remove() {
  declare luks_key_filename="${VAR_LUKS_KEY:-luks.txt}" luks_key_path="" signing_pass_path=""
  declare -a find_args=("${VAR_TMP_SECRET}" -xdev -type f)

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

  validate_secret_staging_area || return "${ERR_SECRET_PATH}"

  if [[ "${VAR_SIGNER}" == "true" ]]; then
    validate_secret_file_in_root "${VAR_SIGNING_KEY_PASS}" "signing passphrase file" || return "${ERR_SECRET_PATH}"
    signing_pass_path="${VAR_TMP_SECRET}/${VAR_SIGNING_KEY_PASS}"
    find_args+=(! -path "${signing_pass_path}")
  fi

  validate_secret_file_in_root "${luks_key_filename}" "LUKS key file" || return "${ERR_SECRET_PATH}"
  luks_key_path="${VAR_TMP_SECRET}/${luks_key_filename}"
  find_args+=(! -path "${luks_key_path}")

  # shellcheck disable=SC2312
  find "${find_args[@]}" -print0 | xargs -0 --no-run-if-empty shred -fzu -n 5 --
  find "${VAR_TMP_SECRET}" -xdev -depth -type d -empty -delete

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

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