[OE-core] [PATCH] openssh: resolve install conflict with openssh-sftp-server-dev

[Urs Fässler]

On Mon, 2018-09-24 at 15:26 +0200, Urs Fässler wrote:
> On Wed, 2018-09-19 at 09:01 -0700, Richard Purdie wrote:
> > On Wed, 2018-09-19 at 17:11 +0200, Andreas Oberritter wrote:
> > > On Wed, 19 Sep 2018 08:41:35 +0200
> > > Urs Fässler <urs.fassler at bbv.ch> wrote:
> > > 
> > > > Image generation fails with the configuration:
> > > >   EXTRA_IMAGE_FEATURES = "ssh-server-dropbear eclipse-debug
> > > > dev-
> > > > pkgs"
> > > > This is due the dependency eclipse-debug -> openssh-sftp-server 
> > > > ->
> > > > openssh-dev -> openssh. openssh can not be installed since it
> > > > conflicts
> > > > with dropbear.
> > > 
> > > That's odd. Why does openssh-sftp-server depend on openssh-dev?
> > > Does
> > > openssh-dev contain a file which it shouldn't, e.g. a dynamically
> > > loaded module/plug-in?
> > 
> > It doesn't, its the fact that "dev-pkgs" are requested in
> > IMAGE_FEATURES. "openssh-dev" would be the default for openssh
> > packages
> > and dropbear-dev would be the default for dropbear packages. 
> >
> > The patch here doesn't sound correct. I'm wondering if the
correct
> > fix
> > is for ${PN}-dev should not depend on ${PN} and whether that
> > would fix
> > the problem?
> 
> The dependency from ${PN}-dev to ${PN} seems to be the default
> behavior
> in Yocto. I don't know the consequences when we change this for
> openssh. But it helps in my case.
> (I added RDEPENDS_${PN}-dev = "", didn't found a better way)

If somebody know the implication of removing the dependency from ${PN}-
dev to ${PN} for openssh and give the ok for it, I am fine with this
solution.

> Another workaround is, when I don't allow the generation of an empty
> ${PN}-dev package. I have the same considerations as with the
> previous
> idea.
> 
> I see the problem that dev-pkgs automatically installs openssh-dev if
> I
> select the openssh-sftp-server.
> The nice solution would be to tell Yocto not to install openssh-dev
> when openssh-sftp-server and dev-pkgs is configured. But I have no
> idea
> if or how this is possible.

I don't think it is possible on a package level. Only in the script
that resolved the *-dev installation. This is done with scripts/oe-
pkgdata-util at line ~116. First, it tries to install package xyz-dev
for package xyz. If the package xyz-dev does not exist, it looks from
which recipe package xyz does come from. If it is from abc, then abc-
dev is installed.

Adding the openssh-sftp-server-dev guides the script to use the first
choice of the script.

Kind Regards
Urs