cross build for RELENG8 on RELENG10 now fails

[Peter Wemm]

On Wednesday, September 10, 2014 04:30:09 PM Doug Ambrisko wrote:
> On Wed, Sep 10, 2014 at 11:52:09AM -0400, John Baldwin wrote:
> | On Wednesday, September 10, 2014 11:42:14 AM Mike Tancsa wrote:
> | > When I upgraded our cross build server to RELENG10 from 9, I lost the
> | > ability to build RELENG_8 images.  Is there some magic that needs to be
> | > done in order to make this work on RELENG_10 ?
> | 
> | I punted on building 8 on 10 when I ran into this (I know use bhyve vms
> | running 8 to test MFCs to 8 since I can boot-test them as well as
> | build-test them).  I don't think there are any known workarounds.
> 
> We've been building older releases via chroot and setting environment
> variables.  I have some local hacks to set the uname etc info. in
> a jail via sysctl in the jail.

This is the only "officially" supported cross-branch mode we supported, aside 
from the N -> N+1 path.

It's how we build everything at work, and how we build in the freebsd.org 
cluster.  It's way faster than a VM and generally no hassle.

For the freebsd.org cluster:
fetch 8.4-REL base.* -> build stage 1 -> svn checkout -> buildworld from 8.4-
REL to 8-stable -> installworld in a clean chroot -> roll tarballs.
fetch 9.3-REL base.txz -> build stage 1 -> svn checkout -> buildworld from 
9.3-REL to 9-stable -> installworld in a clean chroot -> roll tarballs.

.. and so on.  For 11.x we use a ftp.freebsd.org/snapshots build.

At work, we go much, much further.  We even build 4-stable, 6-stable and 7-
stable on 11.x hosts this way.  (Why?  we modify libc.so.4 to run better on 
10.x/11.x and copy it from the 4.x build environment into the compat area on 
later releases during the build process)

But we *never* cross build from head.  Too many moving targets, harder to 
reproduce a specific build, etc.

We used to have this written down somewhere.  The supported upgrade path used 
to be explicitly documented as N.0 -> N-stable-> N+1.0, ie:

5-stable -> 6.0 -> 6-stable -> 7.0 -> 7-stable -> 8.0 -> 8-stable etc, and 
never in reverse.

-- 
Peter Wemm - peter at wemm.org; peter at FreeBSD.org; peter at yahoo-inc.com; KI6FJV
UTF-8: for when a ' or ... just won\342\200\231t do\342\200\246
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