Command line option in addition to GUIX_PACKAGE_PATH - Reason?

[Danny Milosavljevic]

Hi Pierre,
Hi zimoun,

On Thu, 19 Dec 2019 18:14:53 +0100
Pierre Neidhardt <address@hidden> wrote:

> zimoun <address@hidden> writes:
> 
> > Do you have in mind commands where the option --load-path is still missing?
> > Maybe "guix graph"?  
> 
> Yes.
> 
> > Maybe "guix edit"?  
> 
> Yes.

... why?  There's the environment variable already--what does it give us
to have yet another way to specify the value?

Shells allow you to do

  ENVVAR1=value command1

anyway.

zimoun wrote:

>But IMHO, the normal use should be via the --load-path option and the
>GUIX_LOAD_PATH should be less and less used; stay here for historical
>reason and/or backward compatibility and/or some devel use-case.

Why?  *PATH environment variables have a long tradition in UNIX and are not
going to vanish (or mean something else any time) soon.  What is the use
case this change is supposed to enable?

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