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grml2iso
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grml2iso
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#!/usr/bin/env bash
# Filename: grml2iso
# Purpose: create a multiboot grml ISO using grml2usb
# Authors: Michael Prokop <[email protected]>
# Bug-Reports: see http://grml.org/bugs/
# License: This file is licensed under the GPL v2 or any later version.
################################################################################
set -e -o pipefail
# make sure we have the sbin directories in our PATH to find grml2usb ootb
PATH="${PATH}:/sbin:/usr/local/sbin:/usr/sbin"
# adjust variables if necessary through environment {{{
# path to the grml2usb script you'd like to use
[ -n "$GRML2USB" ] || GRML2USB='grml2usb'
# support mkisofs as well as genisoimage
if which xorriso >/dev/null 2>&1 ; then
MKISOFS='xorriso -as mkisofs'
elif which mkisofs >/dev/null 2>&1; then
MKISOFS='mkisofs'
elif which genisoimage >/dev/null 2>&1; then
MKISOFS='genisoimage'
else
echo "Error: neither xorriso nor mkisofs nor genisoimage available - can not create ISO." >&2
exit 1
fi
if ! which isohybrid >/dev/null 2>&1 ; then
echo "Error: isohybrid executable not found (install syslinux/isolinux/syslinux-utils?)." >&2
exit 1
fi
# }}}
# helper stuff {{{
usage() {
echo >&2 "Usage: $0 [OPTIONS] -o target.iso source1.iso [source2.iso ...]"
echo >&2 "
Options:
-b Boot Params Additional boot parameters passed to grml2usb
-c Directory Copy files from directory to generated ISO
-f Force overwrite of existing target.iso
-r BootParam Remove specified boot params.
Can be specified multiple times.
-p <grml2usb param> Add the specified parameter to the grml2usb
commandline. For a list of valid parameters have
a look at the grml2usb manpage.
Can be specified multiple times.
-s URI Generate a small ISO file which downloads the squashfs
file from the specified URI. Please note that due to
restrictions in the bootprocess only IPs are allowed.
Supported protocols are: http and ftp
-t Directory Directory that should be used for temporary files
during build, instead of using a temporary directory
created by mktemp(1).
Examples:
$0 -s http://192.168.23.42:8000/grml/ -o small.iso grml64-small_2021.07.iso
Will generate a file small.iso which tries to download the squashfs file from
http://192.168.23.42:8000/grml/ - the squashfs file is placed in the same
output directory as the ISO file.
"
[ -n "$1" ] && exit $1 || exit 1
}
# }}}
# command line handling {{{
[[ $# -gt 2 ]] || usage 1
ISOFILE=''
DIR=''
ADD_OPTS=''
FORCE=''
URI=''
typeset -a GRML2USB_OPTS
while getopts fb:c:o:r:p:s:t: name; do
case $name in
o) ISOFILE="$OPTARG";;
b) GRML2USB_OPTS+=(--bootoptions="$OPTARG");;
c) DIR="$(readlink -f "$OPTARG")"; [ -n "$DIR" ] || { echo "Could not read $OPTARG - exiting" >&2 ; exit 1 ; } ;;
f) FORCE='true';;
r) GRML2USB_OPTS+=(--remove-bootoption="$OPTARG");;
p) GRML2USB_OPTS+=("$OPTARG");;
s) URI="$OPTARG";;
t) WRKDIR="$(readlink -f "$OPTARG")";;
?) usage 2;;
esac
done
# test for specified URI
if [ -n "$URI" ] ; then
GRML2USB_OPTS+=(--bootoptions="fetch=$URI")
fi
# make sure -o is specified
[ -n "$ISOFILE" ] || usage 1
# we don't to override any files by accident
if [ -e "$ISOFILE" -a ! -n "$FORCE" ]; then
echo "Error: target file $ISOFILE exists already." >&2
exit 1
fi
if [ ! -z "$DIR" -a ! -d "$DIR" ] ; then
echo "Error: specified parameter for -c is not a directory" >&2
exit 1
fi
# }}}
# we need root permissions for executing grml2usb {{{
if [[ $(id -u) != 0 ]]; then
echo >&2 "Error: please run $0 as root."
exit 1
fi
# }}}
# check for grml2usb {{{
if [ ! -x "$(which $GRML2USB)" ] && [ ! -x "$GRML2USB" ] ; then
echo "Error: Could not find grml2usb executable. Is /usr/sbin missing in PATH?" >&2
echo "Tip: run GRML2USB=/usr/sbin/grml2usb grml2iso ... as workaround" >&2
if [ -x "./$GRML2USB" ] ; then
echo >&2 "If you executed grml2iso from the grml2usb repository use"
echo >&2 "GRML2USB=./grml2usb $0 $*"
fi
exit 1
fi
# }}}
# variables {{{
ORIG_DIR="$(pwd)"
# normalise path
case $ISOFILE in
/*) ;;
*) ISOFILE=$ORIG_DIR/$ISOFILE ;;
esac
# }}}
# ensure to properly set up working directory {{{
WRKDIR_EXISTED='false'
if [ -z "$WRKDIR" ] ; then
WRKDIR="$(mktemp -d)"
else
[ -d "$WRKDIR" ] && WRKDIR_EXISTED='true'
fi
GRML2USB_OPTS+=(--tmpdir="$WRKDIR")
rm -rf "$WRKDIR/cddir" "$WRKDIR/grub_tmp"
mkdir -p "$WRKDIR/cddir"
# }}}}
# execute grml2usb with all ISOs you'd like to install {{{
# remove all parameters
shift $(($OPTIND - 1))
$GRML2USB "${GRML2USB_OPTS[@]}" "$@" "$WRKDIR/cddir"
# }}}
# move syslinux to isolinux {{{
mv "$WRKDIR"/cddir/boot/syslinux "$WRKDIR"/cddir/boot/isolinux
echo "menu label ^Isolinux prompt" > "$WRKDIR"/cddir/boot/isolinux/promptname.cfg
echo "include hd.cfg" >> "$WRKDIR"/cddir/boot/isolinux/grmlmain.cfg
# }}}
# change to $WRKDIR {{{
# make sure $WRKDIR is an absolute path, otherwise accessing files
# in it will fail later in the code path if user provided a
# relative directory
WRKDIR=$(realpath $WRKDIR)
cd "$WRKDIR/cddir"
# }}}
# efi boot {{{
# default, independent of UEFI support
BOOT_ARGS="-no-emul-boot -boot-load-size 4 -boot-info-table -b boot/isolinux/isolinux.bin -c boot/isolinux/boot.cat"
UEFI_ENABLE=false
case "$MKISOFS" in
xorriso*)
echo "Using xorriso for ISO generation."
if ! dpkg --compare-versions $(dpkg-query -W -f='${Version}\n' xorriso 2>/dev/null) gt-nl 1.1.6-1 ; then
echo "Disabling (U)EFI boot support since xorriso version is not recent enough."
else
echo "xorriso with -eltorito-alt-boot support present"
UEFI_ENABLE=true
if ! [ -r "${WRKDIR}/cddir/boot/efi.img" ] ; then
echo "Warning: File /boot/efi.img not found, not extending boot arguments for (U)EFI boot."
UEFI_ENABLE=false
else
echo "/boot/efi.img found, extending boot arguments for (U)EFI boot."
if ! [ -r /usr/lib/ISOLINUX/isohdpfx.bin ] ; then
echo "Error: /usr/lib/ISOLINUX/isohdpfx.bin not available, required for xorriso/isohybrid though." >&2
echo "Hint: make sure isolinux is installed." >&2
exit 1
else
BOOT_ARGS+=" -boot-info-table -eltorito-alt-boot -e boot/efi.img -no-emul-boot"
BOOT_ARGS+=" -isohybrid-mbr /usr/lib/ISOLINUX/isohdpfx.bin -eltorito-alt-boot -e boot/efi.img -no-emul-boot -isohybrid-gpt-basdat -no-pad"
fi
fi
fi
;;
*)
echo "Using $MKISOFS for ISO generation (lacking UEFI option), disabling (U)EFI boot support."
;;
esac
# }}}
# adjust ISO for small output if necessary {{{
if [ -n "$URI" ] ; then
bootloader_files=$(find . -name "*.cfg" -type f)
bootloader_files+=" "
bootloader_files+=$(find . -name "*.lst" -type f)
output_dir=$(dirname "$ISOFILE")
for squashfs in $(find . -name *.squashfs) ; do
media_path="$(dirname "$squashfs")"
filename="$(basename "$squashfs")"
target="$output_dir/$filename"
if [ -f "$target" ] && [ ! -n "$FORCE" ] ; then
echo >&2 "Warning: $target already exists, and -force not specified, not overwriting"
else
mv $squashfs $target
OUTPUT_FILES+=("$target")
fi
sed -i -e "s#^\(^.*$media_path.*\)\($URI\)\(.*$\)#\1$URI/$filename\3#g" $bootloader_files
done
fi
# }}}
# copy specified directory to cd {{{
if [ -n "$DIR" ] ; then
echo >&2 "Copying ${DIR} to generated ISO"
for param in GRML_NAME VERSION RELEASENAME DATE SHORT_NAME \
VERSION BOOTID RELEASE_INFO ; do
EXCLUDE_PARAM="$EXCLUDE_PARAM --exclude **%${param}%**"
done
rsync -a ${DIR}/ $EXCLUDE_PARAM .
fi
# adjust files from overlay directory
for GRML_VERSION_FILE in $(find . -name grml-version) ; do
GRML_NAME=$(awk '{print $1}' "$GRML_VERSION_FILE")
VERSION=$(awk '{print $2}' "$GRML_VERSION_FILE")
RELEASENAME=$(sed 's/.*- \(.*\).*\[.*/\1/' "$GRML_VERSION_FILE")
DATE=$(sed 's/.*\[\(.*\)].*/\1/' "$GRML_VERSION_FILE")
SHORT_NAME="$(echo $GRML_NAME | tr -d ',./;\- ')"
RELEASE_INFO="$GRML_NAME $VERSION - $RELEASENAME"
BOOTID=$(cat conf/bootid.txt)
for param in GRML_NAME VERSION RELEASENAME DATE SHORT_NAME \
RELEASE_INFO BOOTID ; do
value="$(eval echo '$'"$param")"
# copy parameterized files from the overlay directory
for file in $(find ${DIR} -name "*%$param%*") ; do
file=${file##$DIR/}
target_dir="$(dirname ${file})"
mkdir -p "$target_dir" || true
cp -r ${DIR}/${file} ./${target_dir}/"$(basename ${file/\%${param}\%/$value})"
done
# adjust config files
for file in ./boot/isolinux/*.cfg ./boot/isolinux/*.msg \
./boot/grub/*.cfg ; do
sed -i "s/%$param%/$value/g" ${file} 2>/dev/null || true
done
done
done
# }}}
# generate the CD/DVD ISO {{{
$MKISOFS -V 'grml-multiboot' -l -r -J $BOOT_ARGS \
-o "$ISOFILE" .
# }}}
# cleanup {{{
cd "$ORIG_DIR"
sync
rm -rf "$WRKDIR/cddir" "$WRKDIR/grub_tmp"
[[ $WRKDIR_EXISTED = 'false' ]] && rmdir "$WRKDIR"
echo "Generated $ISOFILE"
if [ -n "$URI" ] ; then
echo "
Information:
==============
You requested to generate a small ISO image. Your generated
ISO image $ISOFILE does _not_ contain the squashfs files from
the source ISO images.
You have to provide the extracted squashfs files under $URI.
ISO image: $ISOFILE
Squashfs files: ${OUTPUT_FILES[@]}
URI: $URI
"
fi
# }}}
## EOF #########################################################################
# vim:foldmethod=marker ts=2 ft=sh ai expandtab tw=80 sw=2