Libguestfs - Apr 2014 - Problem with virt-sysprep

Hi there,

I was wondering if you could help me with a problem I'm having with 
virt-sysprep. It's a recurrent problem running virt-sysprep:

    Examining the guest ...
    Fatal error: exception Guestfs.Error("guestfs_launch failed.
    See http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs
    and/or run 'libguestfs-test-tool'.")

So I ran virt-sysprep and libguestfs-test-tool after setting these:

  export LIBGUESTFS_DEBUG=1
  export LIBGUESTFS_TRACE=1

... and have attached the output files.

Do you have any ideas on how to fix this?

Bests,

Stuart

-- 
Stuart Young
Director of Bioinformatics
Annai Systems
2100 Palomar Airport Road, Suite 210,
Carlsbad, CA 92008
Mobile: 305-781-2286
Email: stuarty@annaisystems.com

On Mon, Apr 07, 2014 at 10:12:05PM -0700, Stuart Young
wrote:
> Hi there,
> 
> I was wondering if you could help me with a problem I'm having with
> virt-sysprep. It's a recurrent problem running virt-sysprep:
> 
>    Examining the guest ...
>    Fatal error: exception Guestfs.Error("guestfs_launch failed.
>    See http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs
>    and/or run 'libguestfs-test-tool'.")
> 
> So I ran virt-sysprep and libguestfs-test-tool after setting these:
> 
>  export LIBGUESTFS_DEBUG=1
>  export LIBGUESTFS_TRACE=1
> 
> ... and have attached the output files.
Thanks for the detailed debugging information.  The bug is really very
strange:

  mkdtemp: /tmp/lvmKOCUDb: No such file or directory

It comes from this code in the appliance:

  https://github.com/libguestfs/libguestfs/blob/master/daemon/lvm-filter.c#L72

That link is to the latest upstream code.  It hasn't changed at all
since 1.20 (or for years before that), so I find it quite baffling why
it is failing now.

Is /tmp (on your host) a regular directory or have you moved it or
symlinked it or done something else to it?

You could try the following which should cause a real /tmp directory
to be created in the appliance:

  mkdir tmp
  echo tmp | cpio --quiet -o -H newc >
/usr/lib64/guestfs/supermin.d/00-tmp.img
  rmdir tmp

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top

Hi Richard,

That did it! I had /tmp symlinked so changing it back solved the 
problem. Thank you so much - you saved me a lot of time and sweat!

Bests,

Stuart


On 04/08/2014 03:07 PM, Richard W.M. Jones wrote:
> On Mon, Apr 07, 2014 at 10:12:05PM -0700, Stuart Young wrote:
>> Hi there,
>>
>> I was wondering if you could help me with a problem I'm having with
>> virt-sysprep. It's a recurrent problem running virt-sysprep:
>>
>>     Examining the guest ...
>>     Fatal error: exception Guestfs.Error("guestfs_launch failed.
>>     See http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs
>>     and/or run 'libguestfs-test-tool'.")
>>
>> So I ran virt-sysprep and libguestfs-test-tool after setting these:
>>
>>   export LIBGUESTFS_DEBUG=1
>>   export LIBGUESTFS_TRACE=1
>>
>> ... and have attached the output files.
> Thanks for the detailed debugging information.  The bug is really very
> strange:
>
>    mkdtemp: /tmp/lvmKOCUDb: No such file or directory
>
> It comes from this code in the appliance:
>
>   
https://github.com/libguestfs/libguestfs/blob/master/daemon/lvm-filter.c#L72
>
> That link is to the latest upstream code.  It hasn't changed at all
> since 1.20 (or for years before that), so I find it quite baffling why
> it is failing now.
>
> Is /tmp (on your host) a regular directory or have you moved it or
> symlinked it or done something else to it?
>
> You could try the following which should cause a real /tmp directory
> to be created in the appliance:
>
>    mkdir tmp
>    echo tmp | cpio --quiet -o -H newc >
/usr/lib64/guestfs/supermin.d/00-tmp.img
>    rmdir tmp
>
> Rich.
>
-- 
Stuart Young
Director of Bioinformatics
Annai Systems
2100 Palomar Airport Road, Suite 210,
Carlsbad, CA 92008
Mobile: 305-781-2286
Email: stuarty@annaisystems.com