From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#28727: Profiles with intentionally out of date packages are
	upgraded to the newest version
Date: Mon, 09 Oct 2017 10:04:52 +0200
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References: <96695834-ef08-db88-32b8-3b61066bb6f1@uq.edu.au>
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To: Ben Woodcroft <b.woodcroft@uq.edu.au>
Cc: 28727@debbugs.gnu.org

Hello,

Ben Woodcroft <b.woodcroft@uq.edu.au> skribis:

> I have a profile with python@2 in it, and running 'guix package -u'
> updates it to python@3, which isn't what I want. I cannot run 'guix
> package -i python@2 -u' because then it tries to install both python@2
> and python@3, which conflicts.
>
> I can workaround this using 'guix package -u; guix package -i
> python@2'. That isn't ideal (wasteful downloading of substitute, extra
> entries in the generations list, etc), but is workable for me, making
> this a low priority bug for me.

There=E2=80=99s this possibility:

  guix package -u . -r python -i python@2

I admit it=E2=80=99s a bit contrived though.

There are several ways to address it:

  1. Rename our Python 2.x package =E2=80=9Cpython2=E2=80=9D.

  2. Add a property to the =E2=80=98python=E2=80=99 package that describes =
it as part of
     the =E2=80=9C2.=E2=80=9D series, and have the upgrade mechanism honor =
that property
     by upgrading to a version prefixed with =E2=80=9C2.=E2=80=9D.

#1 is obviously easier (it triggers a lot of rebuild though).

Thoughts?

Ludo=E2=80=99.