New script to insert a preseed into an iso image
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#!/bin/sh
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# Notes {{{
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# Mount or extract
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# At the end, mounting or extracting the iso use the same disk space, but
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# mount require root permissions, so i choose to extract the iso.
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# }}}
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# Vars {{{
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DEBIAN_VERSION_NAME="stretch"
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DEBIAN_VERSION_NB="9.6.0"
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DEBIAN_ISO_DVD_URL="https://cdimage.debian.org/debian-cd/current/amd64/iso-dvd/debian-${DEBIAN_VERSION_NB}-amd64-DVD-1.iso"
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DEBIAN_ISO_NETINST_URL="https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-${DEBIAN_VERSION_NB}-amd64-netinst.iso"
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DEBIAN_ISO_MINI_URL="http://ftp.nl.debian.org/debian/dists/${DEBIAN_VERSION_NAME}/main/installer-amd64/current/images/netboot/mini.iso"
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TEMP_DIR_ISO=$(mktemp -d -t debian-iso-XXXXXX.tmp)
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DEBIAN_DL_ISO_PATH="${TEMP_DIR_ISO}/debian.iso"
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# }}}
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#USE_DEBIAN_ISO="${DEBIAN_ISO_DVD_URL}"
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USE_DEBIAN_ISO="${DEBIAN_ISO_NETINST_URL}"
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#USE_DEBIAN_ISO="${DEBIAN_ISO_MINI_URL}"
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# Pre-requisites {{{
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if [ ! $(command -v 7z) ]; then
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printf '%b\n' "ERROR : Please install '7z' bin :\\nsudo apt install p7zip-full"
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exit 1
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fi
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if [ ! $(command -v gzip) ]; then
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printf '%b\n' "ERROR : Please install 'gzip' bin :\\nsudo apt install gzip"
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exit 1
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fi
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# }}}
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# Test vars {{{
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case $# in
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1 )
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PRESEED_FILE="${1}"
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;;
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2 )
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PRESEED_FILE="${1}"
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USER_TEMP_DIR="${2}"
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## Check user temp dir argument
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if [ ! -d "${USER_TEMP_DIR}" ]; then
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printf '%b\n' "ERROR : The first argument should be the path to a directory."
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exit 1
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fi
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TEMP_DIR_ISO=$(mktemp -d -t debian-iso-XXXXXX.tmp -p "${USER_TEMP_DIR}")
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;;
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* )
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printf '%b\n' "Usage :"
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printf '%b\n' "$(basename $0) PRESEED_FILE_PATH [TEMP_DIR]"
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printf '%b\n' "-------"
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printf '%b\n' "PRESEED_FILE_PATH : Required"
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printf '%b\n' "Should be the absolut path to the preseed file you want to add to the ISO."
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printf '%b\n' "-------"
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printf '%b\n' "TEMP_DIR : Optionnal"
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printf '%b\n' "If you want to store temporary files and final ISO in a specific directory."
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printf '%b\n' "Note : This script require ISO size × 2 (eg for DVD. 3.4GB × 2)."
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printf '%b\n' "Otherwise \$TMPDIR will be used."
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;;
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esac
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## Check preseed argument
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if [ ! -f "${PRESEED_FILE}" ]; then
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printf '%b\n' "ERROR : The first argument should be the path to preseed file to add."
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exit 1
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fi
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# }}}
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# Download and extract ISO {{{
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wget -q "${USE_DEBIAN_ISO}" -O "${DEBIAN_DL_ISO_PATH}"
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command 7z x -o"${TEMP_DIR_ISO}" -- "${DEBIAN_DL_ISO_PATH}" > /dev/null
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rm -rf -- "${DEBIAN_DL_ISO_PATH}"
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# }}}
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# Manage initrd.gz file {{{
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## Exclude initrd.gz files from xen and gtk directories
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INITRD_GZ_PATH=$(find "${TEMP_DIR_ISO}" -type f \( -path '*xen*' -o -path '*gtk*' \) -prune -o -name "initrd.gz" -print -quit)
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## Uncompress initrd.gz
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gunzip -- "${INITRD_GZ_PATH}" || exit 1
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## Add preseed file to initrd
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INITRD_PATH=$(find "${TEMP_DIR_ISO}" -type f \( -path '*xen*' -o -path '*gtk*' \) -prune -o -name "initrd" -print -quit)
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echo "${PRESEED_FILE}" | cpio --quiet -H newc -o -A -F "${INITRD_PATH}"
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## Recompress to initrd.gz
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gzip -- "${INITRD_PATH}" || exit 1
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## Fix permissions in install directory
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chmod -w -R -- $(dirname -- "${INITRD_GZ_PATH}")
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# }}}
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# Generate new md5sum {{{
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cd -- "${TEMP_DIR_ISO}" || exit 2
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## Exclude some unwanted files
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find . -follow -type f -not \( -name "md5sum.txt" -o -name 'mkisofs' -o -name 'Bootable_NoEmulation.img' -o -path '*isolinux*' \) -exec md5sum {} \; > ./md5sum.txt
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cd - || exit 2
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# }}}
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# Generate new bootable iso {{{
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# }}}
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# If extract image
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#rm -rf -- "${TEMP_DIR_ISO}
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exit 0
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