[OE-core] sstate hash equivalence breaks rm_work

[Tom Rini]

On Sun, Mar 03, 2019 at 04:20:49PM -0600, Joshua Watt wrote:
> On Sun, Mar 3, 2019 at 4:11 PM Joshua Watt <jpewhacker at gmail.com> wrote:
> >
> > On Sun, Mar 3, 2019 at 3:25 PM Tom Rini <trini at konsulko.com> wrote:
> > >
> > > On Sun, Mar 03, 2019 at 03:21:12PM -0600, Joshua Watt wrote:
> > > > On Sun, Mar 3, 2019, 2:47 PM Tom Rini <trini at konsulko.com> wrote:
> > > >
> > > > > Hey all,
> > > > >
> > > > > As part of the packagegroup-core-base-utils series I noticed that
> > > > > with rm_work enabled like I usually have, every build was starting over
> > > > > with rebuilding linux-libc-headers and going down from there.  I
> > > > > finished bisecting this now and it comes down to:
> > > >
> > > > Just for reference, are you trying to use hash equivalence? It sounds like
> > > > not, but I would like to make sure.
> > >
> > > I am not.
> > >
> > > > Also, it there an AB build that uses rm_work that would have seen this?
> > >
> > > OK, so I see I forgot a step that was clear to me, but, uh, not in the
> > > email.  What breaks is for example:
> > > bitbake core-image-minimal && bitbake core-image-minimal
> > > That second build, rather than see "nothing to do" (or at least, almost
> > > nothing to do) says "Oh, I need to build linux-libc-headers from
> > > scratch" and possibly other stuff too, but that's the first thing I
> > > notice.
> >
> > Ok. I've started a build to test it. Would you mind opening a Bugzilla
> > for it and assigning it to me?
> >
> > For posterity, the poky commit SHA is adc37721a86c
> 
> Hmm, FWIW I just tried this on my setup with rm_work enabled and it
> worked as expected (e.g. did not rebuild unnecessarily).... would you
> be able to share more of your setup (local.conf, layers.conf,
> site.conf)?

On oe-core/master, local.conf / layers.conf are as setup.  All of site.conf is:
DL_DIR = "${HOME}/work/OE/downloads"
SSTATE_DIR = "${HOME}/work/OE/sstate-cache-${DISTRO_VERSION}${TARGET_VENDOR}"

# Save more space
INHERIT += "rm_work"
# But keep this around for debugging
RM_WORK_EXCLUDE += ""

INHERIT += "buildstats"
INHERIT += "buildstats-summary"

And:
$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.6 LTS
Release:	16.04
Codename:	xenial

-- 
Tom
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