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In most C tools, virt-sysprep and virt-customize, you have to put the --format parameter before the corresponding -a parameter. ie. The following is correct: guestfish --format qcow2 -a disk1 -a disk2 But the following is incorrect. The --format parameter is dangling and prior to this commit would have been silently ignored: guestfish -a disk1 -a disk2 --format qcow2 After this change, dangling --format parameters now lead to an error: guestfish: --format parameter must appear before -a parameter In virt-customize, also check that --attach-format parameter appears before --attach parameter. Thanks: Lingfei Kong