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Edit Clonezilla ISO

This is how I edit a Clonezilla ISO file to insert my own backup and restore script for a quicker process.

Mount the ISO file as a disk

sudo mount -t iso9660 -o loop clonezilla-live-2.7.1-22-amd64.iso /mnt

Now copy all its contents to a temporary directory.

mkdir /tmp/clonezilla_iso
cd /mnt
tar -cf - . | tar -xvf - -C /tmp/clonezilla_iso

Unpack the squashfs filesystem

cd /tmp
sudo unsquashfs clonezilla_iso/live/filesystem.squashfs

Chroot into squashfs and make your updates

sudo chroot squashfs-root /bin/bash
# exit

Re-pack squashfs filesystem

sudo mksquashfs squashfs-root/ clonezilla_iso/live/filesystem.squashfs -noappend -always-use-fragments

Create new ISO

-isohybrid-mbr /usr/share/syslinux/isohdpfx.bin might be distro specific but check your package manager for the filename.

cd /tmp/clonezilla_iso
sudo xorriso -as mkisofs -R -r -J -joliet-long -l -cache-inodes \
    -iso-level 3 -isohybrid-mbr /usr/share/syslinux/isohdpfx.bin \
    -partition_offset 16 -A 'Clonezilla Custom' -b syslinux/isolinux.bin \
    -c syslinux/ -no-emul-boot -boot-load-size 4 -boot-info-table \
    -eltorito-alt-boot --efi-boot boot/grub/efi.img -isohybrid-gpt-basdat \
    -isohybrid-apm-hfsplus ./ > /tmp/clonezilla-live-custom-amd64.iso

Last update: March 3, 2021