RE: [Xen-devel] Re: is the xen toolstack backwards compatible ?

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Hi Christophe --

What is the earliest version of the tools for which this will work?
For example, can it be used to switch back and forth between
a 3.4.0-based Xen/toolstack and a xen-unstable-based Xen/toolstack
on the same machine?  If so, I would appreciate more information!

Thanks,
Dan

> -----Original Message-----
> From: Christoph Egger [mailto:Christoph.Egger@xxxxxxx]
> Sent: Wednesday, December 09, 2009 4:43 AM
> To: Sander Eikelenboom
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; Keir Fraser
> Subject: [Xen-devel] Re: is the xen toolstack backwards compatible ?
> 
> 
> On Wednesday 09 December 2009 12:25:40 Sander Eikelenboom wrote:
> > Hmmm so i could make  the paths:
> >
> > export LD_LIBRARY_PATH="/usr/local/lib/<xen_hypervisor_version>"
> > export
> > 
> PYTHONPATH="/usr/local/lib/<xen_hypervisor_version>/python2.5/
> site-packages
> >"
> 
> > And let a startup script make symlinks to the right tools for the
> > hypervisor version that is booted (and perhaps config 
> files), then the only
> > place to worry about hypervisor and kernel version is grub.
> 
> Quite.
> 
> In your case I would compile the tools with 
> PREFIX="/usr/<xen_hypervisor_version>"
> and set
> 
> export LD_LIBRARY_PATH="/usr/<xen_hypervisor_version>/lib"
> export 
> PYTHONPATH="/usr/<xen_hypervisor_version>/python2.5/site-packages"
> export PATH="$PATH:/usr/<xen_hypervisor_version>/sbin"
> 
> Then a simple 'xend start' on the command line (or via 
> startup script) is 
> enough.
> 
> > But i think it's perhaps not worth the trouble and a bit 
> ugly to make that
> > general, so just drop the idea :-)
> 
> I do that manually and that works great to switch between 
> different versions
> for my development/testing effort.
> 
> Christoph
> 
> > --
> >
> > Sander
> >
> > Wednesday, December 9, 2009, 11:06:58 AM, you wrote:
> > > On Wednesday 09 December 2009 08:22:14 Keir Fraser wrote:
> > >> On 09/12/2009 00:23, "Sander Eikelenboom" 
> <linux@xxxxxxxxxxxxxx> wrote:
> > >> > So if it was no coincidence but desirable, at the 
> moment xend and
> > >> > xentop from unstable don't seem to work on 3.4.2 
> hypervisor anymore.
> > >>
> > >> There's no compatibility guarantee across different 
> major Xen releases.
> > >> But Christoph Egger did a lot of work to allow multiple 
> toolstacks to be
> > >> installed side by side. I think you should just need to specify a
> > >> PREFIX=/path/to value when building the tools. Is that 
> right, Christoph?
> > >
> > > Yes, this is right.
> > > *Before* you start xend, you need to set two environment variables
> > > LD_LIBRARY_PATH and PYTHONPATH.
> > >
> > > Here is an example for PREFIX="/usr/local" and compiled 
> with python 2.5:
> > >
> > > export LD_LIBRARY_PATH="/usr/local/lib"
> > > export PYTHONPATH="/usr/local/lib/python2.5/site-packages"
> > >
> > > If these are not set correct, python tells you it can't 
> find its modules
> > > or the dynamic linker tells you it can't find the shared 
> libs built from
> > > tools/libxc.
> > >
> > > You should use the same python version you compiled with.
> > > If you are on a machine where 'python' does not exist as 
> a symbolic link
> > > to the installed python version (like me on NetBSD) you 
> need the attached
> > > patch or all python programs installed with "INSTALL_PYTHON_PROG"
> > > end up with '#!' in the first line instead of 
> '#!/path/to/python2.5'
> > > which is stupid.
> > >
> > > I already submitted attached patch earlier but Ian 
> Jackson objected it
> > > because he wants a way to have tools working with a 
> different python
> > > version than it has been compiled with. This sounds 
> obscure to me when
> > > looking at the path python modules get installed to.
> > >
> > > Keir: Please take attached patch. This is better than the current
> > > situation regardless Ian likes it or not. In the latter 
> case taking the
> > > patch should motivate him to come up with a patch finally. :)
> > >
> > > Again:
> > > Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>
> 
> 
> 
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