scripts/make.iso.preseed.sh

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#!/bin/sh
# Notes {{{
# Extract Debian ISO, add a preseed file and rebuild an ISO.
# At the end, mounting or extracting the iso use the same disk space, but
# mount require root permissions, so i choose to extract the iso.
# }}}
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# Test args {{{
case $# in
1 )
PRESEED_FILE="${1}"
TEMP_DIR=$(mktemp --directory -t -- new-preseed-debian-iso-XXXXXX.tmp)
;;
2 )
PRESEED_FILE="${1}"
USER_TEMP_DIR="${2}"
## Check user temp dir argument
if [ ! -d "${USER_TEMP_DIR}" ]; then
printf '%b\n' "ERROR: The second argument should be the path to a directory."
exit 1
fi
TEMP_DIR=$(mktemp --directory --tmpdir="${USER_TEMP_DIR}" -- new-preseed-debian-iso-XXXXXX.tmp)
;;
* )
printf '%b\n' "Usage:"
printf '%b\n' "$(basename ${0}) PRESEED_FILE_PATH [TEMP_DIR]"
printf '%b\n' "-------"
printf '%b\n' "PRESEED_FILE_PATH: Required"
printf '%b\n' "Should be the absolut path to the preseed file you want to add to the ISO."
printf '%b\n' "-------"
printf '%b\n' "TEMP_DIR: Optionnal"
printf '%b\n' "If you want to store temporary files and final ISO in a specific directory."
printf '%b\n' "Note: This script require ISO size×2 (eg for DVD. 3.4GB×2)."
printf '%b\n' "Otherwise \$TMPDIR will be used."
printf '%b\n' "-------"
printf '%b\n' "Dependencies:"
printf '%b\n' "The script use 7z, gzip, xorriso and isolinux. You can install them:"
printf '%b\n' "sudo apt install p7zip-full gzip xorriso isolinux"
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exit 1
;;
esac
## Check preseed argument
if [ ! -f "${PRESEED_FILE}" ]; then
printf '%b\n' "ERROR: The first argument should be the path to preseed file to add."
exit 1
fi
# }}}
# Vars {{{
## Debian release to use
### Can be stretch, stable, buster, testing, sid or unstable
DEBIAN_VERSION_NAME="stretch"
## ISO to download and use
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### Can be:
### dvd
### net, netinst
### non-free, firm, firmware
### mini
DEBIAN_ISO_TYPE="firm"
# Define URL according to specified release name {{{
case "${DEBIAN_VERSION_NAME}" in
"stable" | "stretch" )
DEBIAN_VERSION_NB="9.6.0"
DEBIAN_ISO_DVD_URL="https://cdimage.debian.org/debian-cd/current/amd64/iso-dvd/debian-${DEBIAN_VERSION_NB}-amd64-DVD-1.iso"
DEBIAN_ISO_NETINST_URL="https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-${DEBIAN_VERSION_NB}-amd64-netinst.iso"
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DEBIAN_ISO_NONFREE_URL="http://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/archive/9.7.0+nonfree/amd64/iso-cd/firmware-9.7.0-amd64-netinst.iso"
DEBIAN_ISO_MINI_URL="http://ftp.fr.debian.org/debian/dists/${DEBIAN_VERSION_NAME}/main/installer-amd64/current/images/netboot/mini.iso"
;;
"testing" | "buster" | "unstable" | "sid")
DEBIAN_ISO_DVD_URL="https://cdimage.debian.org/cdimage/weekly-builds/amd64/iso-dvd/debian-testing-amd64-DVD-1.iso"
DEBIAN_ISO_NETINST_URL="https://cdimage.debian.org/cdimage/daily-builds/daily/current/amd64/iso-cd/debian-testing-amd64-netinst.iso"
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DEBIAN_ISO_NONFREE_URL="http://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/weekly-builds/amd64/iso-cd/firmware-testing-amd64-netinst.iso"
DEBIAN_ISO_MINI_URL="http://ftp.fr.debian.org/debian/dists/${DEBIAN_VERSION_NAME}/main/installer-amd64/current/images/netboot/mini.iso"
;;
* )
printf '%b\n' "Please define a correct Debian release name according to:"
printf '%b\n' "stable, buster, testing, sid or unstable"
printf '%b\n' "${DEBIAN_VERSION_NAME} does not seems to be correct."
exit 1
;;
esac
# }}}
# Define ISO type to use {{{
case "${DEBIAN_ISO_TYPE}" in
dvd )
USE_DEBIAN_ISO="${DEBIAN_ISO_DVD_URL}"
;;
net | netinst )
USE_DEBIAN_ISO="${DEBIAN_ISO_NETINST_URL}"
;;
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non-free | firm | firmware )
USE_DEBIAN_ISO="${DEBIAN_ISO_NONFREE_URL}"
;;
mini )
USE_DEBIAN_ISO="${DEBIAN_ISO_MINI_URL}"
;;
* )
printf '%b\n' "Please define a correct ISO type according to:"
printf '%b\n' "dvd, net, netinst or mini"
exit 1
;;
esac
# }}}
## Temp directories according to $TEMP_DIR
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TEMP_ISO_DIR="${TEMP_DIR}/extracted-iso"
TEMP_INITRD_DIR="${TEMP_DIR}/initrd"
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DEBIAN_DL_ISO_PATH="${TEMP_DIR}/debian.iso"
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DEBIAN_PRESEED_ISO_PATH="$(dirname ${TEMP_DIR})/preseed-debian-${DEBIAN_VERSION_NAME}-amd64.iso"
# }}}
# Pre-requisites {{{
if [ ! $(command -v 7z) ]; then
printf '%b\n' "ERROR: Please install '7z' bin:\\nsudo apt install p7zip-full"
exit 1
fi
if [ ! $(command -v gzip) ]; then
printf '%b\n' "ERROR: Please install 'gzip' bin:\\nsudo apt install gzip"
exit 1
fi
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if [ ! $(command -v xorriso) ]; then
printf '%b\n' "ERROR: Please install 'xorriso' bin:\\nsudo apt install xorriso"
exit 1
fi
if [ ! -f /usr/lib/ISOLINUX/isohdpfx.bin ]; then
printf '%b\n' "ERROR: Please install 'isolinux' package:\\nsudo apt install isolinux"
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exit 1
fi
# }}}
# Download and extract ISO {{{
wget -q "${USE_DEBIAN_ISO}" -O "${DEBIAN_DL_ISO_PATH}"
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command 7z x -o"${TEMP_ISO_DIR}" -- "${DEBIAN_DL_ISO_PATH}" > /dev/null
rm -rf -- "${DEBIAN_DL_ISO_PATH}"
## Ensure to have the write permission on the extracted folder
chmod 0700 -- "${TEMP_ISO_DIR}"
# }}}
# Manage initrd.gz file {{{
mkdir -- "${TEMP_INITRD_DIR}"
## Exclude initrd.gz files from xen and gtk directories
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INITRD_GZ_PATH=$(find "${TEMP_ISO_DIR}" -type f \( -path '*xen*' -o -path '*gtk*' \) -prune -o -name "initrd.gz" -print -quit)
## Copy it to a directory
cp -- "${INITRD_GZ_PATH}" "${TEMP_INITRD_DIR}" || exit 2
cd -- "${TEMP_INITRD_DIR}" > /dev/null || exit 2
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## Uncompress initrd.gz then delete it
gunzip < initrd.gz | cpio --extract --quiet --make-directories --no-absolute-filenames >> /dev/null
rm -f -- initrd.gz
## Add preseed file
cp -- "${PRESEED_FILE}" preseed.cfg || exit 2
## Recompress to initrd.gz and move it back to the extracted files for ISO
find . -not -name initrd.gz | cpio --format=newc --create --quiet | gzip --best > initrd.gz
cp -- initrd.gz "${INITRD_GZ_PATH}" || exit 2
## Go back to previous directory and remove no longer useful files
cd - > /dev/null || exit 2
rm -rf -- "${TEMP_INITRD_DIR}"
## Fix permissions in install directory
chmod -w -R -- $(dirname -- "${INITRD_GZ_PATH}")
# }}}
# Generate new md5sum {{{
## Ensure to have the write permission on the iso folder
chmod 0700 -- "${TEMP_ISO_DIR}"
cd -- "${TEMP_ISO_DIR}" > /dev/null || exit 2
## Exclude some unwanted files
find . -follow -type f -not \( -name "md5sum.txt" -o -name 'mkisofs' -o -name 'Bootable_NoEmulation.img' -o -path '*isolinux*' \) -exec md5sum {} \; > ./md5sum.txt
## Fix md5sum.txt permissions
chmod -w -- md5sum.txt
cd - > /dev/null || exit 2
# }}}
# Generate new bootable iso {{{
if [ -d "${TEMP_ISO_DIR}/isolinux" ] ; then
xorriso -as mkisofs -o "${DEBIAN_PRESEED_ISO_PATH}" \
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-quiet -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin \
-c isolinux/boot.cat -b isolinux/isolinux.bin -no-emul-boot \
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-boot-load-size 4 -boot-info-table "${TEMP_ISO_DIR}"
else
## For mini.iso creation
xorriso -as mkisofs -o "${DEBIAN_PRESEED_ISO_PATH}" \
-quiet -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin \
-c boot.cat -b isolinux.bin -no-emul-boot \
-boot-load-size 4 -boot-info-table "${TEMP_ISO_DIR}"
fi
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## Then remove temp iso directory
chmod u+w -R -- "${TEMP_ISO_DIR}"
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rm -rf -- "${TEMP_ISO_DIR}"
# }}}
rmdir -- "${TEMP_DIR}"
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printf '%b\n' "The new ISO image is available: ${DEBIAN_PRESEED_ISO_PATH}"
exit 0