[yocto] RDEPENDS and do_rootfs

[Burton, Ross]

Forgot to say, Bitbake's dependency model is loosely based on Debian's
so the Debian Policy is a good read for semantics:

https://www.debian.org/doc/debian-policy/ch-relationships.html#binary-dependencies-depends-recommends-suggests-enhances-pre-depends

Debian's "Depends" is our "RDEPENDS", what you want is "Pre-Depends"
that we don't (yet) support.  As I said, this is just a matter of
picking a name and then mapping it into the control file.

Ross

On Thu, 31 Jan 2019 at 10:49, Burton, Ross <ross.burton at intel.com> wrote:
>
> Presumably the problem here is that you've a maintainer script
> (preinst or postinst) in B that needs a binary/library from A, and is
> failing because B's postinst is running before A is unpacked?  If not,
> please clarify, otherwise the problem is that DEPENDS just talks about
> the final solution.  If you want to express that A needs to be
> installed and configured before B is configured then you'll need to
> use Pre-Depends, which I don't believe are actually supported in the
> packaging classes yet.  I know that dpkg and opkg support this, and
> presumably rpm too, so extending the packaging classes is a few
> minutes work.
>
> Ross
>
> On Thu, 31 Jan 2019 at 06:51, Darcy Watkins <dwatkins at sierrawireless.com> wrote:
> >
> > Hi,
> >
> > Can someone knowledgeable with the inner workings of the build system
> > please confirm...
> >
> > IF package B has RDEPENDS on package A
> >
> > THEN during do_rootfs task, package A will always be installed into
> > rootfs first AND the post-inst scripts of package A will always be run
> > prior to those for package B.
> >
> > Also, if that can be confirmed for 'daisy' branch, that would really be
> > helpful.  If not, then please mention as far back the branch that you
> > know for sure.  Thanks!
> >
> >
> >
> > --
> >
> >
> > Regards,
> >
> > Darcy
> >
> > Darcy Watkins ::  Senior Staff Engineer, Firmware
> >
> > SIERRA
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> >
> > dwatkins at sierrawireless.com :: www.sierrawireless.com
> >
> >
> >
> > --
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