Re: [Libguestfs] [Qemu-devel] [qemu-img] support for XVA

Here's my solution, as a nbdkit plugin written in Perl. As with Max's solution I don't bother to parse the virtual size out of the XML file, so you need to specify that on the command line otherwise the disk will be truncated to the largest extent stored in the file. Also the ‘.xva’ file must not be compressed. $ nbdkit perl script=./xva-reader.pl file=./debian8cloud.xva size=4294967296 $ guestfish --ro --format=raw -a nbd://localhost -i Welcome to guestfish, the guest filesystem shell for editing virtual machine filesystems and disk images. Type: 'help' for help on commands 'man' to read the manual 'quit' to quit the shell Operating system: 8.2 /dev/sda1 mounted on / total 100 drwxr-xr-x 22 root root 4096 Jan 8 2016 . drwxr-xr-x 19 root root 4096 Nov 16 09:50 .. drwxrwxr-x 2 root root 4096 Jan 8 2016 bin drwxr-xr-x 3 root root 4096 Jan 8 2016 boot drwxr-xr-x 4 root root 4096 Jan 8 2016 dev drwxr-xr-x 87 root root 4096 Jan 8 2016 etc drwxr-xr-x 3 root root 4096 Jan 8 2016 home lrwxrwxrwx 1 root root 31 Jan 8 2016 initrd.img -> /boot/initrd.img-3.16.0-4-amd64 drwxr-xr-x 14 root root 4096 Jan 8 2016 lib drwxr-xr-x 2 root root 4096 Jan 8 2016 lib64 drwx------ 2 root root 16384 Jan 8 2016 lost+found drwxr-xr-x 3 root root 4096 Jan 8 2016 media drwxr-xr-x 2 root root 4096 Jan 8 2016 mnt drwxr-xr-x 2 root root 4096 Jan 8 2016 opt drwxr-xr-x 2 root root 4096 May 4 2015 proc drwx------ 2 root root 4096 Jan 8 2016 root drwxr-xr-x 2 root root 4096 Jan 8 2016 run drwxr-xr-x 2 root root 4096 Jan 8 2016 sbin drwxr-xr-x 2 root root 4096 Jan 8 2016 srv drwxr-xr-x 2 root root 4096 Apr 6 2015 sys drwxrwxrwt 7 root root 4096 Jan 8 2016 tmp drwxr-xr-x 10 root root 4096 Jan 8 2016 usr drwxr-xr-x 11 root root 4096 Jan 8 2016 var lrwxrwxrwx 1 root root 27 Jan 8 2016 vmlinuz -> boot/vmlinuz-3.16.0-4-amd64 I even managed to boot the Debian 8 guest from the sample .xva file: $ qemu-system-x86_64 -cpu host -machine accel=kvm:tcg -m 2048 -drive file=nbd:localhost:10809,format=raw,if=virtio,snapshot=on although it was pretty slow ... As mentioned before you can use this to do a qemu-img convert using captive nbdkit: $ nbdkit -U - \ perl script=./xva-reader.pl file=./debian8cloud.xva size=4294967296 \ --run 'qemu-img convert -f raw $nbd -O qcow2 /var/tmp/output.qcow2 -p' HTH, Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html