Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
213 lines
7.0 KiB
Bash
213 lines
7.0 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.installer
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# SPDX-Security-Contact: security@coresecret.eu
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### Options in "GRUB_CMDLINE_LINUX" are always effective.
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### Options in "GRUB_CMDLINE_LINUX_DEFAULT" are effective ONLY during normal boot (NOT during recovery mode).
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guard_sourcing
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### Variable to finish GRUB CMDLINE strings.
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declare -grx VAR_H='"'
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#######################################
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# Helper module to extract the current GRUB CMDLINE strings.
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# Globals:
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# TARGET
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# VAR_GRUB_CMDLINE_LINUX
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# VAR_GRUB_CMDLINE_LINUX_DEFAULT
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# VAR_ORIG_GRUB_CMDLINE_LINUX
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# VAR_ORIG_GRUB_CMDLINE_LINUX_DEFAULT
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# Arguments:
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# None
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#######################################
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old_grub_extract_current_string() {
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# shellcheck disable=SC2155
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declare -gx VAR_ORIG_GRUB_CMDLINE_LINUX=$(grep -E 'GRUB_CMDLINE_LINUX=' "${TARGET}/etc/default/grub")
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# shellcheck disable=SC2155
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declare -gx VAR_ORIG_GRUB_CMDLINE_LINUX_DEFAULT=$(grep -E 'GRUB_CMDLINE_LINUX_DEFAULT=' "${TARGET}/etc/default/grub")
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# shellcheck disable=SC2155
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declare -gx VAR_GRUB_CMDLINE_LINUX=$(grep -E 'GRUB_CMDLINE_LINUX=' "${TARGET}/etc/default/grub" | sed 's/.$//')
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# shellcheck disable=SC2155
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declare -gx VAR_GRUB_CMDLINE_LINUX_DEFAULT=$(grep -E 'GRUB_CMDLINE_LINUX_DEFAULT=' "${TARGET}/etc/default/grub" | sed 's/.$//')
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}
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#######################################
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# description
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# Globals:
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# TARGET
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# VAR_ORIG_GRUB_CMDLINE_LINUX
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# VAR_ORIG_GRUB_CMDLINE_LINUX_DEFAULT
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# VK_GRUB_CMDLINE_LINUX
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# VK_GRUB_CMDLINE_LINUX_DEFAULT
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# VV_GRUB_CMDLINE_LINUX
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# VV_GRUB_CMDLINE_LINUX_DEFAULT
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# Arguments:
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# None
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# Returns:
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# 0: on success
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#######################################
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grub_extract_current_string() {
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### Declare Arrays, HashMaps, and Variables.
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declare -gx VAR_ORIG_GRUB_CMDLINE_LINUX="" VAR_ORIG_GRUB_CMDLINE_LINUX_DEFAULT="" \
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VK_GRUB_CMDLINE_LINUX='' VK_GRUB_CMDLINE_LINUX_DEFAULT='' \
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VV_GRUB_CMDLINE_LINUX="" VV_GRUB_CMDLINE_LINUX_DEFAULT=""
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declare vv_raw_lin="" vv_raw_lin_def=""
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### Original lines (retained, strictly anchored).
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VAR_ORIG_GRUB_CMDLINE_LINUX=$(grep -E '^GRUB_CMDLINE_LINUX=' "${TARGET}/etc/default/grub")
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VAR_ORIG_GRUB_CMDLINE_LINUX_DEFAULT=$(grep -E '^GRUB_CMDLINE_LINUX_DEFAULT=' "${TARGET}/etc/default/grub")
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### Keys (fixed prefixes).
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VK_GRUB_CMDLINE_LINUX='GRUB_CMDLINE_LINUX='
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VK_GRUB_CMDLINE_LINUX_DEFAULT='GRUB_CMDLINE_LINUX_DEFAULT='
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### Raw values (with quotes if necessary).
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# shellcheck disable=SC2295
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vv_raw_lin="${VAR_ORIG_GRUB_CMDLINE_LINUX#${VK_GRUB_CMDLINE_LINUX}}"
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# shellcheck disable=SC2295
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vv_raw_lin_def="${VAR_ORIG_GRUB_CMDLINE_LINUX_DEFAULT#${VK_GRUB_CMDLINE_LINUX_DEFAULT}}"
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### Remove outer quotes symmetrically.
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if [[ -n ${vv_raw_lin} ]]; then
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declare q="${vv_raw_lin:0:1}"
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if [[ ${q} == "'" || ${q} == '"' ]]; then
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[[ ${vv_raw_lin: -1} == "${q}" ]] && vv_raw_lin=${vv_raw_lin:1:-1} || vv_raw_lin=${vv_raw_lin:1}
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fi
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fi
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if [[ -n ${vv_raw_lin_def} ]]; then
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declare q="${vv_raw_lin_def:0:1}"
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if [[ ${q} == "'" || ${q} == '"' ]]; then
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[[ ${vv_raw_lin_def: -1} == "${q}" ]] && vv_raw_lin_def=${vv_raw_lin_def:1:-1} || vv_raw_lin_def=${vv_raw_lin_def:1}
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fi
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fi
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### Trim leading and trailing whitespace (including TAB, CR, and LF).
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### Front: remove the longest prefix from whitespace.
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vv_raw_lin="${vv_raw_lin#"${vv_raw_lin%%[![:space:]]*}"}"
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vv_raw_lin_def="${vv_raw_lin_def#"${vv_raw_lin_def%%[![:space:]]*}"}"
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### Rear: remove the longest suffix from whitespaces.
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vv_raw_lin="${vv_raw_lin%"${vv_raw_lin##*[![:space:]]}"}"
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vv_raw_lin_def="${vv_raw_lin_def%"${vv_raw_lin_def##*[![:space:]]}"}"
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### Expose end values (only value, without quotes, trimmed)
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# shellcheck disable=SC2034
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VV_GRUB_CMDLINE_LINUX="${vv_raw_lin}"
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# shellcheck disable=SC2034
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VV_GRUB_CMDLINE_LINUX_DEFAULT="${vv_raw_lin_def}"
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return 0
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}
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#######################################
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# description
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# Globals:
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# TARGET
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# VAR_GRUB_CMDLINE_LINUX
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# VAR_GRUB_CMDLINE_LINUX_DEFAULT
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# VK_GRUB_CMDLINE_LINUX
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# VK_GRUB_CMDLINE_LINUX_DEFAULT
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# VV_GRUB_CMDLINE_LINUX
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# VV_GRUB_CMDLINE_LINUX_DEFAULT
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# Arguments:
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# None
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# Returns:
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# 0 ...
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#######################################
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grub_finalize_string() {
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### Declare Arrays, HashMaps, and Variables.
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declare -a ary_lines=()
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declare var_file="${TARGET}/etc/default/grub"
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declare var_new_lin="${VK_GRUB_CMDLINE_LINUX}'${VV_GRUB_CMDLINE_LINUX}'"
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declare var_new_lin_def="${VK_GRUB_CMDLINE_LINUX_DEFAULT}'${VV_GRUB_CMDLINE_LINUX_DEFAULT}'"
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declare -i var_found_lin=0 var_found_lin_def=0 var_line=0 i=0
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mapfile -t ary_lines < "${var_file}"
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### Replace lines strictly based on the key (including '=').
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for (( i=0; i<${#ary_lines[@]}; i++ )); do
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var_line=${ary_lines[i]}
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case "${var_line}" in
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"${VK_GRUB_CMDLINE_LINUX}"*)
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ary_lines[i]="${var_new_lin}"
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var_found_lin=1
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;;
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"${VK_GRUB_CMDLINE_LINUX_DEFAULT}"*)
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ary_lines[i]="${var_new_lin_def}"
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var_found_lin_def=1
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;;
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esac
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done
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### If Key is missing in the file, add it at the end (robust against minimal templates).
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(( var_found_lin == 0 )) && ary_lines+=("${var_new_lin}")
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(( var_found_lin_def == 0 )) && ary_lines+=("${var_new_lin_def}")
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### Write back (without sed/awk, only built-ins).
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{
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for var_line in "${ary_lines[@]}"; do
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printf '%s\n' "${var_line}"
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done
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} >| "${var_file}"
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### For subsequent use, export the complete lines as well.
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declare -gx VAR_GRUB_CMDLINE_LINUX="${var_new_lin}"
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declare -gx VAR_GRUB_CMDLINE_LINUX_DEFAULT="${var_new_lin_def}"
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return 0
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}
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#######################################
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# Helper module to finish the modified GRUB CMDLINE strings.
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# Globals:
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# TARGET
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# VAR_GRUB_CMDLINE_LINUX
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# VAR_GRUB_CMDLINE_LINUX_DEFAULT
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# VAR_H
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# VAR_ORIG_GRUB_CMDLINE_LINUX
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# VAR_ORIG_GRUB_CMDLINE_LINUX_DEFAULT
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# Arguments:
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# None
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#######################################
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old_grub_finalize_string() {
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declare var_grub_cmdline_linux="" var_grub_cmdline_linux_default=""
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var_grub_cmdline_linux="${VAR_GRUB_CMDLINE_LINUX}${VAR_H}"
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var_grub_cmdline_linux_default="${VAR_GRUB_CMDLINE_LINUX_DEFAULT}${VAR_H}"
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VAR_GRUB_CMDLINE_LINUX=$(printf '%s' "${var_grub_cmdline_linux}" | sed -e 's/[\/&\$]/\\&/g' )
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VAR_GRUB_CMDLINE_LINUX_DEFAULT=$(printf '%s' "${var_grub_cmdline_linux_default}" | sed -e 's/[\/&\$]/\\&/g' )
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sed -i "s|${VAR_ORIG_GRUB_CMDLINE_LINUX}|${VAR_GRUB_CMDLINE_LINUX}|" "${TARGET}/etc/default/grub"
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sed -i "s|${VAR_ORIG_GRUB_CMDLINE_LINUX_DEFAULT}|${VAR_GRUB_CMDLINE_LINUX_DEFAULT}|" "${TARGET}/etc/default/grub"
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}
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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