Prelude

The .xva is actually a .tar file, that contain a xml with the configuration for XEN and folders with names like Ref:99, these foldes are the virtual disk of the VM.

Into of each folder has many blocks used by the virtual disk with name like 00000171 and a checksum file with name like 00000171.checksum.

To create the raw disk you need the follow parameters:

• Name of xva file (foo.xva)
• Referency
• Last block of each virtual disk to convert
• Name of the new raw disk (bar.img)

Obtain virtual disk folder names

Use the follow command:

tar tf foo.xva |awk -F "/" {'print $1'} |sort | uniq -c

You obtain an output like this:

1 ova.xml
280378 Ref:5
19522 Ref:8

Then you virtual disk folder are Ref:5 and Ref:8

Obtain the last virtual disk block

Use the follow command

tar tf foo.xva |grep Ref:5 |tail -n2

That show an output like:

Ref:99/00000174
Ref:99/00000174.checksum

Change the grep for you virtual disk folder Ref name

Create the new raw image

Now you can use the xva2img.sh as follow:

./xva2img.sh foo.xva Ref:5 00000174 bar.img

When the command end, you have a new bar.img file and you can user that over KVM Hypervisor or another

TIPS

You can use the raw image to use with VirtualBox, use the follow command to do that:

vboxmanage convertfromraw bar.img foo.vdi --format VDI

ToDo

• Add the search commando to the script