Re: guix refresh to a specific version?

[Hartmut Goebel]

Hi,

Am 17.06.22 um 17:37 schrieb Ludovic Courtès:
> It’s currently not possible, but pretty much all the machinery is there,
> in importers.  It’s a low-hanging fruit that I think we should pick!

I gave it a try and discovered that we need to discuss the interface and 
design:

One can already specify a version, which defines the package to be 
updated. The respective place the code has the comment

Take either the specified version or the latest one.

and this was added by you (Ludo) in 
4b9b3cbbc45afa3e374889847d4ab8673b8b2db2 (April 2015):

refresh: Allow users to refer to specific package versions.

* guix/scripts/refresh.scm (guix-refresh): Use 'specification->package'
  instead of 'find-packages-by-name'.  This allows users to specify
  things like "qt-4.8.6".


Beside this, I'm unconfident about the implementation: Currently refresh 
passes around package objects and passes this to the updater. When 
updating to a specific version, we need to pass around both the package 
and the desired version, which implies case-handling at many places. Any 
idea how to solve this elegantly?

--
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |