bug#53883: strange conflicts with guix package -m manifest

["Ludovic Courtès" <ludo@gnu.org>]

Hi,

Leo Famulari <leo@famulari.name> skribis:

> Basically, the python-twine package, as it is now, cannot be installed
> in a profile.
>
> That is because its dependency graph of propagated packages includes
> different versions of python-cffi, and you cannot install both of these
> cffi packages alongside each other in a symlink forest (i.e. a profile).

Any idea how this could be addressed?

There are currently 133 dependents of python-cffi@1.15 (python-cmarkgfm
is the only direct user) and 3,807 dependents of python-cffi@1.14.  It’d
be easier if they all depended on 1.14.

Unfortunately we can’t just use 1.14 for python-cmarkgfm:

--8<---------------cut here---------------start------------->8---
$ guix build python-cmarkgfm --with-input=python-cffi@1.15=python-cffi@1.14
[…]
ERROR: Could not find a version that satisfies the requirement cffi>=1.15.0 (from versions: none)
ERROR: No matching distribution found for cffi>=1.15.0
--8<---------------cut here---------------end--------------->8---

Should we downgrade python-cmarkgfm, or relax its requirements?  Marius,
WDYT?  :-)

Ludo’.