[gentoo-dev] cyclic dependency

[gentoo-dev] cyclic dependency

[Vieri Di Paola]

Hi.

How can one avoid cyclic dependencies in custom
ebuilds?

eg.
soft1.ebuild DEPENDs on soft2
but 
soft2.ebuild also DEPENDs on soft1
(both packages are required; none of the two works
alone so it wouldn't make sense to install just one)

Is there a function that can be used to check whether
a certain package+version has already been emerged?



       
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[gentoo-dev] Re: cyclic dependency

[Christian Faulhammer]

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Vieri Di Paola <vieridipaola@yahoo.com>:

> Is there a function that can be used to check whether
> a certain package+version has already been emerged?

 has_version, but in what way do they depend on each other?  Is a
PDEPEND possible?

V-Li

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Re: [gentoo-dev] Re: cyclic dependency

[Vieri Di Paola]

--- Christian Faulhammer <opfer@gentoo.org> wrote:

> Vieri Di Paola <vieridipaola@yahoo.com>:
> 
> > Is there a function that can be used to check
> whether
> > a certain package+version has already been
> emerged?
> 
>  has_version, but in what way do they depend on each
> other?  Is a
> PDEPEND possible?

I'm not an experienced ebuild scripter.
I only knew of RDEPEND and DEPEND.
Now I'm reading this on PDEPEND:
http://devmanual.gentoo.org/general-concepts/dependencies/index.html

The two software packages depend at run-time.
I'll try PDEPEND.
Thank you.


       
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Re: [gentoo-dev] Re: cyclic dependency

[Marijn Schouten (hkBst)]

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Vieri Di Paola wrote:
> The two software packages depend at run-time.

then they can simply RDEPEND on eachother. The package manager should do the
right thing.

Questions like this one are best asked in #gentoo-dev-help IRC channel,

Marijn
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Re: [gentoo-dev] Re: cyclic dependency

[Vieri Di Paola]

--- "Marijn Schouten (hkBst)" <hkBst@gentoo.org>
wrote:

> Vieri Di Paola wrote:
> > The two software packages depend at run-time.
> 
> then they can simply RDEPEND on eachother. The
> package manager should do the
> right thing.

No, it reports a cyclic dependency.

> Questions like this one are best asked in
> #gentoo-dev-help IRC channel,

I currently don't have an IRC client and am not really
used to using them, especially without X.
Anyway, I guess I'll end up connecting some day.

Thanks for your time.



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[gentoo-dev] Re: cyclic dependency

[Ryan Hill]

Marijn Schouten (hkBst) wrote:
> Vieri Di Paola wrote:
>> The two software packages depend at run-time.
> 
> then they can simply RDEPEND on eachother. The package manager should do the
> right thing.

It doesn't.  See freetype which requires >=fontconfig-2.3 at runtime
which in turn requires freetype at runtime.  Bug #179736.


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Re: [gentoo-dev] Re: cyclic dependency

[Vlastimil Babka]

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Ryan Hill wrote:
> Marijn Schouten (hkBst) wrote:
>> Vieri Di Paola wrote:
>>> The two software packages depend at run-time.
>> then they can simply RDEPEND on eachother. The package manager should do the
>> right thing.
> 
> It doesn't.  See freetype which requires >=fontconfig-2.3 at runtime
> which in turn requires freetype at runtime.  Bug #179736.

I think the problem is that fontconfig has freetype not just in RDEPEND
but also DEPEND (see how in the emerge error output one dep is reported
as medium and the other as hard). Which is interpreted as 'needed at
build time in working state, thus with all its RDEPENDs (which includes
satisfied', creating the circular deps.
So, just RDEPEND on each other should be fine (at least in recent
portage, I think older ones treated RDEPEND and DEPEND the same). But if
one package has DEPEND, the other one needs PDEPEND.

P.S. I think the solution with PDEPEND is wrong for bug 179736. If I
understand it correctly, then >freetype-2.2 doesn't NEED
>=fontconfig-2.4, but, if installed, will crash older versions. Then
there should be a blocker on <fontconfig-2.4 in freetype. I think
portage handles that correctly since some point. And if not, it should :)
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[gentoo-dev] Re: cyclic dependency

[Ryan Hill]

Vlastimil Babka wrote:

> Ryan Hill wrote:

>> It doesn't.  See freetype which requires >=fontconfig-2.3 at runtime
>> which in turn requires freetype at runtime.  Bug #179736.

> I think the problem is that fontconfig has freetype not just in RDEPEND
> but also DEPEND

Doh.  You're right of course.

> P.S. I think the solution with PDEPEND is wrong for bug 179736. If I
> understand it correctly, then >freetype-2.2 doesn't NEED
> >=fontconfig-2.4, but, if installed, will crash older versions. Then
> there should be a blocker on <fontconfig-2.4 in freetype. I think
> portage handles that correctly since some point. And if not, it should :)

I'm a firm believer that blockers absolutely suck and should be avoided
at all costs.  But in this case I don't see another way around it, since
while playing around just now I discovered another way to break the
depgraph with the current PDEPEND.

Thanks for the advice. :)


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Re: [gentoo-dev] Re: cyclic dependency

[Vieri Di Paola]

--- Christian Faulhammer <opfer@gentoo.org> wrote:

> Is a
> PDEPEND possible?

I followed your suggestion and posted a couple of
ebuilds for the upcoming Shorewall 4 package:

http://bugs.gentoo.org/show_bug.cgi?id=174588

I am not seeing cyclic dependency issues anymore.

Thanks for any suggestions.

Vieri



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