Hi! I've been using Guix on top of Debian for more than 2 years and I saw
something that spurred a doubt about how Guix manages conflicts.
So the other day I got the following output from ``guix package -u`` after a
``guix pull``:
$ guix package --dry-run -u python-jsonschema
The following package would be upgraded:
python-jsonschema 2.6.0 -> 3.0.1
/gnu/store/va4hgdfx8zbqzyah7vgqkm25g60p8lf3-python-jsonschema-3.0.1
guix package: error: profile contains conflicting entries for python-attrs
guix package: error: first entry: python-attrs@18.2.0
/gnu/store/awb7awycpf1crpd1kllvk6qzchd4g7lw-python-attrs-18.2.0
guix package: error: ... propagated from python-jsonschema@3.0.1
guix package: error: second entry: python-attrs@18.2.0
/gnu/store/s77kxps7sybxxdny68xkbcp51ffmiwfl-python-attrs-18.2.0
guix package: error: ... propagated from python-automat@0.6.0
guix package: error: ... propagated from python-twisted@17.5.0
guix package: error: ... propagated from python-txtorcon@19.0.0
guix package: error: ... propagated from magic-wormhole@0.11.2
hint: Try upgrading both `python-jsonschema' and `magic-wormhole', or
remove one of them from the profile.
I understand the error message, and upgrading both packages fixed the issue
indeed. What I don't get is *why* having two different versions of
``python-attrs`` in the profile is considered an error. My understanding was
that two different packages in the profile should be able to depend on
different versions of the same library without problems, since they are
referred by its absolute path in the store so they don't conflict. I
understand that I may not directly ``guix install`` two versions of the same
package (because the may e.g. put the same entry under ``$GUIX_PROFILE/bin``),
but in my case ``python-attrs`` is just a dependency package which doesn't
show up in ``guix package -I``.
Can anybody shed some light on the issue? Thanks!
PS: Yes, I started to write about this in the IRC channel but I pasted too
many command output lines and got banned. Oops!
--
Ivan Vilata i Balaguer -- https://elvil.net/
