remaster archlinux ISO

remast-eriso.sh

#!/bin/bash
set -x

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

MNT=/mnt/archiso
ISO=${ISO:-/path/to/my/archlinux-2017.10.01-x86_64.iso}
TMP_DIR=/mnt/customiso

rm -rf $TMP_DIR
rm $DIR/arch-custom.iso

mkdir $MNT
mkdir $TMP_DIR
mount -t iso9660 -o loop $ISO $MNT

set -e
cp -a $MNT/* $TMP_DIR
cd $TMP_DIR/arch/x86_64

unsquashfs airootfs.sfs

# this is the important part
# copy your files over to $TMP_DIR/arch/x86_64/squashfs-root

# my installer should be at /root
cp $DIR/installer.sh $TMP_DIR/arch/x86_64/squashfs-root/root

rm airootfs.sfs
mksquashfs squashfs-root airootfs.sfs
rm -r squashfs-root
md5sum airootfs.sfs > airootfs.md5

cd $TMP_DIR
# !important
# The ISO label must remain the same as the original label (in this case ARCH_201209) for the image to boot successfully
# You can check the label with `strings <iso> | grep ARCH_
genisoimage -l -r -J -V "ARCH_201710" -b isolinux/isolinux.bin -no-emul-boot -boot-load-size 4 -boot-info-table -c isolinux/boot.cat -o $DIR/arch-custom.iso ./

umount $MNT
rm -rf $TMP_DIR