[poky] SSTATE_MIRRORS not working?

[Joshua Lock]

On Fri, 2017-01-13 at 15:58 +0100, Kristian Amlie wrote:
> On 13/01/17 13:35, Kristian Amlie wrote:
> > On 13/01/17 11:41, Richard Purdie wrote:
> > > On Fri, 2017-01-13 at 09:50 +0100, Kristian Amlie wrote:
> > > > For some time now, I've had the problem that SSTATE_MIRRORS
> > > > does not
> > > > work properly for me. I can see that it downloads lots of
> > > > packages
> > > > from the cache, but once the setscene stage is over, and
> > > > runqueue
> > > > begins, it starts the whole build from scratch regardless.
> > > > 
> > > > This used to work for me before, it would only run a small
> > > > subset of
> > > > the tasks locally, taking full advantage of the cache, so I'm
> > > > fairly
> > > > certain my setup is correct. For me it broke maybe six weeks
> > > > ago or
> > > > so (master branch).
> > > > 
> > > > I realize this question may be more appropriate for bitbake-
> > > > devel,
> > > > and I can provide more details, but I thought I'd just hear if
> > > > anybody else has experienced the same, before I go digging.
> > > 
> > > Which SSTATE_MIRRORS are you using?
> > 
> > It's a private build machine in the cloud. It's simply the sstate-
> > cache
> > folder exposed with Apache, and me pointing my mirror at it with:
> > 
> >   SSTATE_MIRRORS ?= "file://.* http://1.2.3.4/PATH"
> > 
> > > The build logs should show what is being rebuilt. The autobuilder
> > > does
> > > reuse sstate during its builds and we'd likely have noticed long
> > > build
> > > times if it was completely broken so its likely some mismatch
> > > between
> > > your setup and what is in the particular mirror you're using.
> > 
> > I'll try to do a more thorough check, and compare downloaded
> > packages
> > with built packages.
> 
> Looker closer, it appears that it's all the native tools that are
> rebuilt. This didn't use to happen though. What could be the
> difference
> factor here?

Did you recently change distro (i.e. was using poky and switched to a
custom distro)? Does your distro use uninative?

http://www.yoctoproject.org/docs/2.2/mega-manual/mega-manual.html#ref-c
lasses-uninative

> My machine is Ubuntu 16.04 and the cloud machine I use as a mirror is
> Debian 8. Could this be significant?

If you aren't using uninative the different host OS won't share sstate
for native recipe variants.

Regards,

Joshua