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qemu, libvirtd, virt-manager, and possibly qemu-arch-extra)
n.b., to use virt-manager, the user needs to be part of the libvirt group:
# gpasswd -a $(whoami) libvirt
Mount a Qemu image
# modprobe --first-time nbd # qemu-nbd -c /dev/nbd0 <path of the .qcow2 file>
Now /dev/mbd0 is a block device connected to the qcow2 file.
To disconnect use:
# qemu-nbd -d /dev/nbd0