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How to Safely Modify a SquashFS-Based Live Linux System Like SystemRescue

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Live Linux distributions such as SystemRescue store their root filesystem inside a read-only SquashFS archive embedded within an ISO9660 image. Modifying such a system requires extracting the ISO, editing the SquashFS rootfs via chroot or overlay, then rebuilding both the SquashFS and the bootable ISO. For SystemRescue specifically, the recommended approach prioritizes YAML configuration, SRM overlay modules, and the official sysrescue-customize script before attempting direct SquashFS reconstruction. On Debian or Ubuntu-based systems, the key dependencies include squashfs-tools, xorriso, and rsync, with QEMU and OVMF useful for post-modification testing. Sufficient disk space — roughly three times the ISO size — is advised, particularly when rebuilding from within a live SystemRescue environment.

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How to Safely Modify a SquashFS-Based Live Linux System Like SystemRescue · ShortSingh