Re: Cookbook recipe from "The Repository as a Channel" section does not work for Guix with properly configured GUILE_LOAD_PATH

[pelzflorian (Florian Pelz)]

Hello Nigko.  Your demonstration makes the guile channel work and is
valuable already, but we disagree which path to take now.

current-source-directory looks as if it were written without
consideration of symlinks; it resolves some and not others and none of
this is documented or tested.  My preferred option would be to fix it; I
doubt peoples’ configuration or channels rely on not resolving symlinks.

A bad option is to make `local-file' use some new
`current-source-directory-always-resolving-symlinks'.

Another bad option, to avoid any iota of ABI break in main guix, is to
change the guile repo, change the guix-cookbook, change the blog entry
from which the guix-cookbook section is derived.  To add a note along
the lines of “current-source-directory is a mess when using symlinks,
local-file uses it, so please use no local-file and use current-module
instead.”

I’m not involved with guix core, but IMO it would be wrong.  Rather
please send your `absolute-dirname' work to guix-patches, which the core
team would look at and have an opinion on.  Preferrably simplifying
`absolute-dirname' to not check (string-prefix? "/" file).

Regards,
Florian