#!/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

#######################################
# Prevents the file to be sourced twice.
# Globals:
#   None
# Arguments:
#   1: File to source.
#######################################
source_guard() {
  declare var_file="${1}"
  declare var_name="${var_file##*/}"
  declare var_guard="_${var_name//[^a-zA-Z0-9_]/_}_LOADED"

  if ! declare -p "${var_guard}" &>/dev/null; then
    # shellcheck disable=SC1090
    . "${var_file}"
  fi
}
### Prevents accidental 'unset -f'.
# shellcheck disable=SC2034
readonly -f source_guard
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh