From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#30710: guix graph gives duplicate nodes
Date: Mon, 12 Mar 2018 15:27:19 +0100
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	(Hartmut Goebel's message of "Sat, 10 Mar 2018 17:31:30 +0100")
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To: Hartmut Goebel <h.goebel@crazy-compilers.com>
Cc: 30710 <30710@debbugs.gnu.org>

Hello,

Hartmut Goebel <h.goebel@crazy-compilers.com> skribis:

> On Fri, 09 Mar 2018 23:59:26 +0100 ludo@gnu.org (Ludovic Court=C3=A8s) wr=
ote:
>>
>>> Good catch!  I implemented what you suggest above in commit
>>> 464f5447396fcec9b43f7eab71d5d42b522a157f.
>
> Thanks, this solved the issue only partially: On my "kde-plasma" branch:
>
> $ ./pre-inst-env guix graph plasma-workspace | grep autoconf
> =C2=A0 "133094208" [label =3D "autoconf-wrapper-2.69", shape =3D box, fon=
tname =3D
> Helvetica];
> =C2=A0 "133094976" [label =3D "autoconf-2.69", shape =3D box, fontname =
=3D Helvetica];
> =C2=A0 "152772352" [label =3D "autoconf-wrapper-2.69", shape =3D box, fon=
tname =3D
> Helvetica];
> =C2=A0 "152420544" [label =3D "autoconf-2.69", shape =3D box, fontname =
=3D Helvetica];
>
> There are other packages, which are duplicate but don't have a factory
> AFAIK:
>
> $ ./pre-inst-env guix graph plasma-workspace | grep kbus
> =C2=A0 "130257472" [label =3D "kdbusaddons-5.42.0", shape =3D box, fontna=
me =3D
> Helvetica];
> =C2=A0 "148171200" [label =3D "kdbusaddons-5.42.0", shape =3D box, fontna=
me =3D
> Helvetica];

That stems from the use of =E2=80=98package-mapping=E2=80=99 or
=E2=80=98package-input-rewriting=E2=80=99 (maybe via =E2=80=98package-with-=
python2=E2=80=99), which can
create distinct package objects mapping to the same derivation.

I don=E2=80=99t have a good solution here.

Thanks,
Ludo=E2=80=99.