[OE-core] opkg dependencies and update-alternatives

[Martin Jansa]

On Mon, Nov 18, 2013 at 10:54:47AM +0800, ChenQi wrote:
> On 11/18/2013 02:57 AM, Paul Barker wrote:
> > Hi all,
> >
> > I've been trying to add PACKAGECONFIG options to opkg and have ran
> > into a dependency loop whilst building with certain options. Enabling
> > curl support within opkg requires a dependency on curl. curl in turn
> > depends on ncurses (via a few intermediate dependencies) and ncurses
> > uses update-alternatives causing a dependency on
> > virtual/update-alternatives.
> > PREFERRED_PROVIDER_virtual/update-alternatives is set to "opkg" in
> > meta/conf/distro/include/default-providers.inc and so we have a
> > dependency loop if curl is enabled via the new PACKAGECONFIG options
> > for opkg.
> >
> > I can cause the same dependency loop by setting
> > PREFERRED_PROVIDER_virtual/update-alternatives to "dpkg" as dpkg
> > directly depends on ncurses (which uses update-alternatives). So if
> > someone wanted to use the more powerful update-alternatives from dpkg
> > on a target system it doesn't look like that is currently possible.
> >
> > This places quite a constraint on whichever recipe PROVIDES
> > update-alternatives. Going forward I'm hoping to use libarchive within
> > opkg and libarchive depends on bzip2 by default which uses
> > update-alternatives, which would cause the same problem.
> >
> > Does anyone have any clever solutions to this? Perhaps we could split
> > update-alternatives off into its own recipe which should be dependent
> > on very little, allowing opkg a little more freedom in its
> > dependencies.
> >
> > Thanks,
> >
> 
> I opened a bug some time ago for this update-alternative problem.
> https://bugzilla.yoctoproject.org/show_bug.cgi?id=4836
> 
> It would be really helpful if you could add some input in the comments 
> of that bug.

FWIW: current u-a implementation provided by opkg is in OE-classic and
was in older poky/oe-core provided also in standalone recipe
update-alternatives-cworth

http://git.openembedded.org/openembedded/tree/recipes/update-alternatives/update-alternatives-cworth_0.99.154.bb

commit 44b538eedab7c255051fa3375f9f2439cd2db3dd
Author: Marcin Juszkiewicz <hrw at openedhand.com>
Date:   Wed Mar 19 15:36:01 2008 +0000

    update-alternatives-cworth: dropped as they are now generated with opkg recipe

-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
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