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Description of problem: Specify QEMU interface emulation with add-drive-with-if(add-drive $file iface:ide) break libguestfs, the parameter translate to libvirt xml file is incorrect, supermin helper [00000ms] finished creating kernel supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/base.img supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/daemon.img supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/hostfiles supermin helper [00023ms] visiting /usr/lib64/guestfs/supermin.d/init.img supermin helper [00023ms] visiting /usr/lib64/guestfs/supermin.d/ntfs.hostfiles supermin helper [00024ms] visiting /usr/lib64/guestfs/supermin.d/ntfs.img supermin helper [00024ms] visiting /usr/lib64/guestfs/supermin.d/udev-rules.img supermin helper [00024ms] adding kernel modules supermin helper [00053ms] finished creating appliance libguestfs: checksum of existing appliance: 138a4a0202de035445cab9d54cd31237b2f29cfabc109ad06528b04c1e9b 20fd libguestfs: trace: get_cachedir libguestfs: trace: get_cachedir = "/var/tmp" libguestfs: command: run: qemu-img libguestfs: command: run: \ create libguestfs: command: run: \ -f qcow2 libguestfs: command: run: \ -b /var/tmp/.guestfs-0/root.26443 libguestfs: command: run: \ -o backing_fmt=raw libguestfs: command: run: \ /tmp/libguestfslrGiSI/snapshot2 Formatting '/tmp/libguestfslrGiSI/snapshot2', fmt=qcow2 size=4294967296 backing_file='/var/tmp/.guestfs- 0/root.26443' backing_fmt='raw' encryption=off cluster_size=65536 lazy_refcounts=off libguestfs: [00090ms] create libvirt XML libguestfs: error: 'iface' parameter is not supported by the libvirt attach-method libguestfs: trace: launch = -1 (error) the correct xml should be like below, <disk type='file' snapshot='external'> <driver name="tap" type="aio" cache="default"/> <source file='/var/lib/xen/images/fv0' startupPolicy='optional'> <seclabel relabel='no'/> </source> <target dev='hda' bus='ide'/> <iotune> <total_bytes_sec>10000000</total_bytes_sec> <read_iops_sec>400000</read_iops_sec> <write_iops_sec>100000</write_iops_sec> </iotune> <boot order='2'/> <encryption type='...'> Version-Release number of selected component (if applicable): libguestfs-1.20.1-4.el7.x86_64 How reproducible: always Steps to Reproduce: 1. #guestfish -x -v 2. #add-drive $file iface:ide 3. #run Actual results: Expected results: Additional info: