Re: [libvirt] libguestfs integration: rich disk access for libvirt applications
On Wed, Sep 28, 2011 at 11:14:57AM +0100, Stefan Hajnoczi wrote:
On Tue, Sep 27, 2011 at 12:55 PM, Richard W.M. Jones
<rjones(a)redhat.com> wrote:
> To put this all into one place:
>
> (1) An ugly new libvirt API that runs febootstrap-supermin-helper to
> create the appliance.
[...]
> I'm worried about item (1) in this list ...
This is the only instance where libvirt knows about libguestfs. All
other steps are libguest only or involve libguestfs knowing about
libvirt.
Would it be possible introduce a "domain-builder" concept into
libvirt? When libguestfs is installed it drops a domain-builder
configuration/script that libvirt can pick up. Then you can say
something like virDomainBuild(name="guestfs-appliance",
builder="guestfs").
We do have a historical syntax from Xen paravirt which lets us call out
to a helper at boot time, namely the "<bootloader>" element. With Xen
this is typically something like pygrub, or pxegrub, which does some
work and writes out a kernel+initrd into temporary files, and prints
the file paths + any kernel args on stdout.
We could just wire up this concept in KVM too without any real trouble,
and then we could have guestfs-bootloader script todo the magic setup
Regards,
Daniel
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