Issue when trying to read a XVA virtual disk #261

TH3xACE · 2022-09-05T21:12:57Z

Any idea ? Everything is working fine with vmdk, vdi, vhd.... only having issue with XVA disks

LTRData · 2022-09-06T13:55:18Z

Looks like the XVA archive has an invalid timestamp for one of the files in the archive. If you open the XVA file in for example 7-zip or with tar -tlf file.xva, do you see anything strange with the date and time for any of the files?

TH3xACE · 2022-09-07T16:25:46Z

Thanks for replying :) and btw great project :) really helpful... I think there was an issue since the file format of my file was qcow but the file extension .xva ... so I tried to use the .xva provided here > http://downloadns.citrix.com.edgesuite.net/11655/XenServer-7.0.0-dlvm.xva but it is also not working...

zivillian · 2022-09-07T18:36:26Z

I've looked into this and can reproduce the issue. After digging a bit deeper, I can say that the example XVA is a gzipped tar file. After removing the additional gzip layer (by just decompressing it) it can successfully be read by discutils:

I don't know if the specification for XVA files changed or if the current implementation is just wrong. Is there an official specification for this format?

TH3xACE · 2022-09-07T18:41:27Z

I think that this might give us an insight https://github.com/eriklax/xva-img

zivillian · 2022-09-07T18:59:02Z

If I'm correct, this tool only works on the content of the XVA file - so you need to manually decompress and unpack the gzip and tar file before it will do anything useful. So it doesn't give us any hint regarding the initial file format.

TH3xACE · 2022-09-07T19:01:33Z

I tried decompress the xva file then try to read it with discutil… the ova.xml is not the content of the disk… I wanted to list the parent directory of the disk

TH3xACE · 2022-09-07T19:03:38Z

A file on the initial file gives this

LTRData · 2022-09-07T20:22:51Z

I just tried to decompress the gzip compressed file. I then renamed the resulting file .xva too, just in case. Then tried the following in PowerShell.

add-type -path .\DiscUtils.FileSystems.dll
add-type -path .\DiscUtils.Containers.dll
[DiscUtils.FileSystems.SetupHelper]::SetupFileSystems()
[DiscUtils.Containers.SetupHelper]::SetupContainers()
$xvafile = [IO.File]::OpenRead('XenServer-7.0.0-dlvm.xva')
$xva = [DiscUtils.Xva.VirtualMachine]::new($xvafile)
$disk = [System.Linq.Enumerable]::First($xva.Disks)
$volmgr = [DiscUtils.VolumeManager]::new($disk)
$volmgr.GetLogicalVolumes() | foreach { $fs = [DiscUtils.FileSystemManager]::DetectFileSystems($_)[0].Open($_); $fs.Root.GetFileSystemInfos() | foreach { $_.Name } }

Result:

lost+found
.vmlinuz-3.10.0-327.13.1.el7.x86_64.hmac
System.map-3.10.0-327.13.1.el7.x86_64
vmlinuz-3.10.0-327.13.1.el7.x86_64
initramfs-3.10.0-327.13.1.el7.x86_64.img
config-3.10.0-327.13.1.el7.x86_64
grub
symvers-3.10.0-327.13.1.el7.x86_64.gz
grub2
lost+found
mnt
bin
var
usr
.initialized
etc
root
tmp
lib64
lib
media
opt
home
builddir
sbin
completion_flag_file2
srv
sys
run
proc
dev

TH3xACE · 2022-09-07T21:29:48Z

thanks will give it a try...

TH3xACE closed this as completed Sep 6, 2022

TH3xACE reopened this Sep 6, 2022

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Issue when trying to read a XVA virtual disk #261

Issue when trying to read a XVA virtual disk #261

Issue when trying to read a XVA virtual disk #261

Issue when trying to read a XVA virtual disk #261

Comments