[gentoo-user] (Solved) please explain this contradictory(?) emerge dependency

[Allan Gottlieb]

On Sun, Dec 18 2011, Allan Gottlieb wrote:

> On Sun, Dec 18 2011, Joshua Murphy wrote:
>
>> On Sun, Dec 18, 2011 at 8:34 PM, Allan Gottlieb <gottlieb@×××.edu> wrote:
>>> I get dependency problems in my normal update world that I can't
>>> understand.  The entire output is below.
>>>
>>> As far as I can tell gnome-2.32.1-r1 (which is installed) is requiring
>>> packages from gnome-3, which must be wrong.  I don't see any such
>>> dependencies in the ebuild for gnome-2.32.1-r1 and there is an "official
>>> mask list" (which I am using) for those of us who want to
>>> delay installing gnome-3 for a while.
>>>
>>> My conclusion that gnome-2... is requiring gnome-3 packages (which I
>>> know is wrong) comes from two points in the output below.
>>>
>>> 1.  The indenting of the --tree --verbose output seems to say this
>>>    (e.g., the first two lines say gnome-2... depends on nautilus-3)
>>>
>>> 2.  The comments related to mask changes at the bottom say
>>>    evince-3... is required by gnome-2...
>>>
>>> Please help.
>>> thanks,
>>> allan
>>
>>
>> Without doing any digging (I'm 100mi away from my Gentoo boxes and
>> sitting on satellite internet, so SSH is painful), I would presume the
>> packages pulling in those dependencies aren't specifying a maximum
>> version, so it's not that they're "requiring" gnome 3 packages,
>> they're requiring gnome packages and are choosing to use the newest,
>> which happens to be part of 3, meaning the gnome 2 ebuilds would need
>> updated to require version < 3.0 to avoid it automatically, and
>> possibly block on mixing 2 and 3 if the mixing really does give
>> issues.
>
> All the gnome-3 packages are masked (package.mask).
>
> Indeed, at the end of my output (see prev msg) you see recommendations
> from emerge for me to remove some masks.
>
> allan

It was more subtle than I thought.  A big tip from Alexandre Rostovtsev
suggested that the problem might be that some package other than
gnome-base/gnome might be requiring nautilus-3 *OR introspection*.

Sure enough the new evince was the culprit.  I put in a workaround for
today but everything should be fine tomorrow due to ...

    From: Allan Gottlieb <gottlieb@×××.edu>
    Subject: Re: [Bug 395173] gnome-light-2.32 shouldn't depend on >=x11-themes/gnome-themes-standard-3.0.2
    To: Alexandre Rostovtsev <tetromino@g.o>
    Date: Mon, 19 Dec 2011 14:47:08 -0500

    On Mon, Dec 19 2011, Alexandre Rostovtsev wrote:

    > On Mon, 2011-12-19 at 10:59 -0500, Allan Gottlieb wrote:
    >> The equery d  command (with depth=2 or depth=30) shows no mention of
    >> gnome-3, but *does* show introspection.  Specifically
    >>
    >> app-text/evince-2.32.0-r3 (nautilus ? >=gnome-base/nautilus-2.10[introspection?])
    >>
    > Ah, that explains it.
    >
    > When we unmasked gobject-introspection in August, the introspection
    > USE flag was masked on versions of gnome-2 packages that were already
    > stable, including on <app-text/evince-2.32.0-r4 and
    > <gnome-base/nautilus-2.32.2.1-r2.
    >
    > Two days ago, evince was bumped to 2.32.0-r4 to fix a crash.
    > Therefore, evince-2.32.0-r4 became the first gnome-2 version of evince
    > that had introspection unmasked, and it wanted to pull in
    > nautilus[introspection]. But the latest gnome-2 version of nautilus in
    > portage was nautilus-2.32.2.1-r1, which had introspection masked.
    > Therefore, evince-2.32.0-r4 effectively depended on nautilus-3. And
    > since nautilus-3 and evince-2.32.0-r4 are both in ~arch, repoman (the
    > automatic script that gentoo developers use to check their ebuilds
    > before committing) did not catch the problem :(
    >
    > I have now fixed it by bumping nautilus to 2.32.2.1-r2, and have
    > alerted the other gnome team members to be aware of this issue.
    >
    > Thank you very much for reporting this as soon as you did!
    >
    > -Alexandre.

    Great.  So tomorrow, my resync will find nautilus...-r2 and I will be
    able to remove
        app-text/evince -introspection
    from package.use.
    (That is the workaround I put in today to permit an update world to
    proceed without gnome-3).

Case closed!
allan