[Libguestfs] [libguestfs/virt-v2v] failed to parse ova (#6)

[Richard W.M. Jones]

On Wed, Apr 21, 2021 at 12:14:09AM -0700, Étienne BERSAC wrote:
> Hi,
> 
> I'm migrating from virt-convert to virt-v2v. I encounter the following error :
> 
> $ virt-v2v -v -x -i ova cornac.ova -o libvirt 
> virt-v2v: virt-v2v 1.43.5 (x86_64)
> libvirt version: 7.0.0
> [   0.0] Opening the source -i ova cornac.ova
> qemu-img info json:'{ "file": { "driver": "raw", "offset": 512, "size": 512, "file": { "filename": "/tmp/v2vqemuimgtst110010.img" } } }' >/dev/null
> qemu-img supports "offset" and "size" in json URLs: true
> libguestfs: trace: set_verbose true
> libguestfs: trace: set_verbose = 0
> libguestfs: trace: get_backend
> libguestfs: trace: get_backend = "direct"
> tar -tf 'cornac.ova'
> tar -xf 'cornac.ova' -C '/var/tmp/ova.b0jm2D' 'cornac.ovf'
> ova: testing if cornac-sda.vmdk exists in cornac.ova
> ova: file exists
> tar tRvf 'cornac.ova'
> libguestfs: trace: close
> libguestfs: closing guestfs handle 0x55c1f751e7b0 (state 0)
> virt-v2v: error: failed to parse line returned by tar: "bloc 0 : -rw-r--r-- 
> bersace/bersace 3702 2020-11-12 15:16 cornac.ovf"

Interesting - I suspect this is an issue with the presumably French
locale.  The output of tar changes and we cannot parse it:

$ LANG=fr_FR tar tRvf /mnt/scratch/libguestfs-1.45.5.tar.gz  | head -2
bloc 2 : drwxr-xr-x rjones/rjones     0 2021-04-09 11:37 libguestfs-1.45.5/
bloc 5 : -rw-rw-r-- rjones/rjones 26530 2020-03-06 19:31 libguestfs-1.45.5/COPYING.LIB

$ LANG=en_GB tar tRvf /mnt/scratch/libguestfs-1.45.5.tar.gz  | head -2
block 2: drwxr-xr-x rjones/rjones     0 2021-04-09 11:37 libguestfs-1.45.5/
block 5: -rw-rw-r-- rjones/rjones 26530 2020-03-06 19:31 libguestfs-1.45.5/COPYING.LIB

This is a bug in both virt-v2v and nbdkit, but should be easy to fix.

You can work around it by setting LANG=C before running virt-v2v.

> rm -rf '/var/tmp/ova.b0jm2D'
> rm -rf '/var/tmp/null.v6fmgC'
> 
> This ova is generated with tar from https://gitlab.com/dalibo/cornac/-/blob/
> master/appliance/cornac.ovf and a vmdk generated by packer.
> 
> Do you have a clue on what is wrong with this .ova ?

We don't generally support imports from any OVA, only ones created by
VMware, so even if the above is fixed then YMMV.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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