Re: [PATCH OSSTEST v2] Arrange to test migration from the previous Xen version

[Ian Campbell <ian.campbell@citrix.com>]

On Tue, 2015-08-11 at 12:30 +0100, Ian Campbell wrote:
> On Mon, 2015-08-03 at 17:01 +0100, Ian Campbell wrote:
> > On Fri, 2015-07-24 at 17:28 +0100, Ian Campbell wrote:
> > > @@ -191,6 +208,27 @@ create_build_jobs () {
> > >                  revision_ovmf=$REVISION_OVMF
> > >      done
> > >  
> > > +    if [ x$want_prevxen = xy ] ; then
> > > +        if [ "x$REVISION_PREVXEN" = x ] ; then
> > > +            echo >&2 "prevxen ?"; exit 1
> > > +        fi
> > 
> > This breaks things with standalone mode, or any make-flight which 
> > didn't
> > come from cr-daily-branch.
> > 
> > In such cases we don't have REVISION_XEN or TREE_XEN either, we just 
> > get
> > the defaults.
> > 
> > I think we need to do something like select_prevxenbranch but to pick a
> > xen.git branch name rather than an osstest branch name.
> > 
> > Or we quietly skip this test if REVISION_PREVXEN is not set.
> > 
> > One to chew on I think.
> 
> At the moment I'm somewhat inclined towards omitting the build-$ARCH-prev
> job in this case but still creating the associated test jobs.

We discussed this IRL and concluded that build-$ARCH already ignores the
$xenbranch when REVISION_XEN is not specified i.e it always builds whatever
clone gives you, AKA master for xen.git and that having build-$ARCH-prev do
the same was at least no worse than that under those circumstances.

As a future yakk shaving exercise something should be taught to translate
osstest's $xenbranch in to a xen.git branch name (ap-push/ap-fetch-version
has this sort of code already) at which time this can all be fixed up.

I need to rebase over Wei's recent libvirt changes and will drop the 'if [
"x$REVISION_PREVXEN" = x ]' block.

Ian.