Example:

#!/bin/bash # qcow2_to_iso.sh - Convert QCOW2 to ISO (non-bootable) set -e QCOW2="$1" ISO_OUT="$2:-output.iso" MOUNT_POINT="/mnt/qcow2_mnt" EXTRACT_DIR="/tmp/iso_extract"

Abstract The QCOW2 (QEMU Copy-On-Write version 2) format is ubiquitous in virtualization environments, particularly those using QEMU/KVM, due to its support for snapshots, compression, and thin provisioning. Conversely, the ISO 9660 image format remains the standard for optical disc representation, used primarily for operating system installation media, live environments, and firmware distribution. While seemingly incompatible—one being a writable, dynamic virtual hard disk and the other a read-only, linear filesystem image—conversion from QCOW2 to ISO is a meaningful task in specific development, testing, and deployment pipelines. This paper explores the technical underpinnings of both formats, details the methodologies for extracting and repackaging contents from a QCOW2 image into an ISO, presents a practical conversion pipeline, and discusses use cases, limitations, and best practices.

sudo mkisofs -o output.iso -R -J /tmp/iso_contents/ Loses partition metadata, bootloaders, and multiple independent root filesystems. The resulting ISO is non-bootable unless manually configured. 4.2 Selective File Extraction (Using libguestfs) More precise and does not require root (beyond libguestfs setup).

guestfish -a disk.qcow2 -i ><fs> copy-out / /tmp/extracted/ ><fs> exit Then create ISO: