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|
#! /bin/bash
# (c) 2023 by Thomas Lange, lange@debian.org
#
# mk-data-partition ISO | <USB device>
# extend an ISO file by size and create a data partition
# for USB stick the data partition will take the whole size of the USB stick
mntdir=/media/data
add_p3() {
# $1: filename or device name
# $2: partition name
local type
if [ -b $2 ]; then
echo "Partition 3 already exists on $1"
exit 4
fi
if [ X$fmt = Xexfat ]; then
type=7
else
type=83
fi
# add 3th partion to the image or device
{ echo -e "n\np\n3\n\n\n"; sleep 2; echo -e "v\nt\n3\n$type\nw\n"; } | fdisk -w never $1 >/dev/null 2>&1
if [ "$?" -ne 0 ]; then
echo "Cannot add 3th partition to $1. Error code $?"
exit 3
fi
udevadm settle --timeout=10
}
make_fs() {
if [ -b $1 ]; then
if [ X$fmt = Xexfat ]; then
mkfs.exfat -L MY-DATA $1
else
mkfs.ext4 -q -L MY-DATA -J size=5 -E lazy_itable_init $1
fi
echo "Data partition MY-DATA created"
fi
}
mount_data() {
mkdir $mntdir
mount $1 $mntdir
}
umount_data() {
umount $mntdir
rmdir $mntdir
}
copy_data() {
cp -a $* $mntdir
echo "Copied files into the ISO."
du --exclude=lost+found -sh $mntdir/*
}
usage() {
cat <<EOF
Usage: mk-data-partition [OPTION] IMAGE [dir...]
Create additional partition for storing data.
-F Format data partition as exFAT. Default is to use ext4
-s Set size of data partition. Default 300M, ignored for USB devices
-c Copy a list of directories to the data partition
IMAGE Can be an ISO file or the device of an USB stick
The command adds a third partition to an ISO or an USB stick containing a bootable ISO.
This partition contains an ext4 or exFAT file system with label MY-DATA that can be
mounted read-write. An ISO file will be extended by the given size, on an USB stick the
partition will take the whole remaining size.
Examples:
Add a data partition of size 1G to the Debian installer ISO using an ext4 partition
# mk-data-partition -s 1G debian-12.2.0-amd64-netinst.iso
Create the data partition using an exFAT file system on USB named /dev/sdb.
First copy (or dd) the ISO onto the USB stick. Then you can add the data partition
to the USB stick.
# mk-data-partition -F /dev/sdb
Create the data partition and copy directories A and B to it
# mk-data-partition -c debian-12.2.0-amd64-netinst.iso A B
Copyright (C) 2023 by Thomas Lange
EOF
exit $1
}
while getopts Fhs:c opt ; do
case "$opt" in
h) usage 0;;
c) copy=1 ;;
F) fmt=exfat ;;
s) size=$OPTARG ;;
*) usage 1;;
esac
done
shift $((OPTIND - 1))
filename=$1
shift
if [ -z "$filename" ]; then
echo "ERROR: No filename or device supplied"
echo
usage 1
fi
filename=$(readlink -f $filename)
if expr "$size" : '^[0-9]\+$' >/dev/null; then
echo "Size $size needs a unit like K, M, G, T"
exit 5
fi
if [ -n "$1" ] && [ X$copy = X ]; then
echo "If you want to copy directories, add -c"
exit 3
fi
if [ $(id -u) != "0" ]; then
echo "Run this program as root."
exit 2
fi
if [ ! -b $filename ] && [ ! -f $filename ]; then
echo "$filename is neither a device nor an existing file"
exit 9
fi
if [ -b $filename ]; then
# file is a USB device
if [ -n "$size" ]; then
echo "Warning: Ignoring the size parameter for USB sticks."
fi
part=${filename}3
add_p3 $filename $part
make_fs $part
fi
if [ -f $filename ]; then
# check if the image already has a 3th partition
set +e
fdisk -l $filename | egrep -q ^${filename}3
if [ $? -eq 0 ]; then
echo "Partition 3 already exists on $filename"
exit 5
fi
size=${size:-300M}
echo "Extend $filename by $size"
truncate -s +$size $filename
if [ $? -ne 0 ]; then
echo "Cannot extend $filename. Aborting"
exit 9
fi
loop=$(losetup -P -f --show $filename)
if [ "$?" -ne 0 ]; then
echo "Cannot create loop device"
exit 5
fi
trap "losetup -d $loop" EXIT
part=${loop}p3
add_p3 $loop $part
make_fs $part
fi
if [ X$copy = X1 ]; then
mount_data $part
copy_data $*
umount_data $part
fi
|
