cross platform building under emulation

[Dan Langille]

On 13 Oct 2005 at 17:23, Brooks Davis wrote:

> On Thu, Oct 13, 2005 at 08:18:36PM -0400, Dan Langille wrote:
> > On 13 Oct 2005 at 17:11, Brooks Davis wrote:
> > 
> > > On Thu, Oct 13, 2005 at 08:02:59PM -0400, Dan Langille wrote:
> > > > My usual practice when building world is to do it once on the fastest 
> > > > box I have, then do installs via NFS mounts.  I need to do this for 
> > > > FreeBSD 4.*, 5.*, 6.*, and -current.  My goal is to do all this with 
> > > > just one box.  At first I thought of multi-booting the box.
> > > > 
> > > > Tonight at the OCUUG meeting <http://www.ocuug.on.ca>, someone 
> > > > mentioned doing this with emulation.  After hearing that, multi-
> > > > booting doesn't sound as good.
> > > > 
> > > > The box in question is an AMD 64 3000+ with 1GB of RAM.  The m/b is a 
> > > > KV8E Deluxe, which gives me the option of onboard RAID-1 SATA.
> > > > 
> > > > What do you think of this idea?  What tools would you suggest?
> > > > 
> > > > The host enviroment will also be used as my main database server 
> > > > running FreeBSD 6, most likely in AMD mode.
> > > 
> > > It should work, but might be a bit slow.
> > > 
> > > You could also consider using Kris's trick of running older userlands in
> > > chroots on -current (or 6.x in your case) kernels like he does on the
> > > ports cluster.  I think his BSDCan paper has the details on the bits you
> > > need to replace to deal with kernel incompatabilities.  The nice that is
> > > that you don't have any emulation in the way.  I think Peter Wemm said
> > > they were also doing i386 chroots on amd64 kernels at Yahoo! so that may
> > > deal with that issue.  At least until 7.0 comes you should be able to do
> > > -current buildworld and buildkernel on 6.x machines so that won't be a
> > > problem (if it is, scream since breaking that is bad :).
> > 
> > Gidday Brooks..  What about jails?
> 
> For this application, I'd say jails are probably overkill.  It would
> give you the ability to run an ssh daemon on the jail which could be
> interesting and would be more like an emulated environment, but I don't
> think you need the extra hardening they give since you can invoke the
> make commands through chroot commands.
> 
> I'm using a similar setup to install ports in a root file system for
> cluster that I distribute via NFS.  In may case the buildworld happen
> natively, but the port builds occur within the chroot.

Daris has got me thinking about unpacking 4.9-release/bin into a 
directory, and then doing a chroot.
-- 
Dan Langille : http://www.langille.org/
BSDCan - The Technical BSD Conference - http://www.bsdcan.org/