bug#30265: Fish shell has wrong path variables

[Meiyo Peng <meiyo.peng@gmail.com>]

Ricardo Wurmus <rekado@elephly.net> writes:

> Where are these environment variables defined?
According to `share/fish/config.fish`, they are defined in fish.cpp.
#+BEGIN_SRC fish
  # __fish_datadir, __fish_sysconfdir, __fish_help_dir, __fish_bin_dir
  # are expected to have been set up by read_init from fish.cpp
#+END_SRC

You can get fish shell's environment variables using fish's `set` command.
A single `set` without argument will print all environment variables.

> The question is whether these old store references are kept in files
> outside of the store (and thus are not directly under our control), or
> if the packages that Guix builds include incorrect references.  I guess
> that it’s the former.
>
> As is the case for these other programmes that record paths in cache
> files, we would need to patch fish to record only the stable names of
> links to those files (e.g. ~/.guix-profile/foo/bar) rather than the
> actual file names in the store, which may disappear upon “guix gc”.
>
Maybe you are right. Guix is still new to me, so I do not know details
about guix's mechanism.


Meiyo Peng