Description of problem: $ virt-rescue --ro --format qcow2 -a rawhide-armv7l.qcow2 Try `virt-rescue --help' for more information. (It works if you use --format=qcow2) Notice there should be an error message of some sort before the "Try `virt-rescue ..." message. Version-Release number of selected component (if applicable): libguestfs-tools-c-1.33.14-1.fc25.x86_64 How reproducible: 100% Steps to Reproduce: 1. See above.
Fixed with https://github.com/libguestfs/libguestfs/commit/dc02e8985f75fef3142c50f0ef352d9087ba4248 which is in libguestfs >= 1.33.28.