Bug#837681: debug output (Re: diffoscope: 'ERROR guestfs can't be launched' when trying to compare to qubes ISOs)

[HW42]

Holger Levsen:
> On Tue, Sep 13, 2016 at 03:35:58PM +0200, Holger Levsen wrote:
>> so I build an Qubes ISO, twice and ran diffoscope against it:
> 
> just now I enabled debugging like this:
> 
>> To see full error messages you may need to enable debugging.
>> Do:
>>   export LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1
> 
> the result is attached.

It fails to find a kernel for the VM image it creates on the fly:

diffoscope-qubes-debug:
> supermin: failed to find a suitable kernel (host_cpu=x86_64).
> 
> I looked for kernels in /boot and modules in /lib/modules.
> 
> If this is a Xen guest, and you only have Xen domU kernels
> installed, try installing a fullvirt kernel (only for
> supermin use, you shouldn't boot the Xen guest with it).
> libguestfs: trace: launch = -1 (error)
> 1473930826.096060    ERROR guestfs can't be launched

On what kind of VM is this run, and what kernels are installed?

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