bug#29519: ./pre-inst-env: substitute: Failed to autoload make-session in (gnutls)

[Leo Famulari <leo@famulari.name>]

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On Tue, Jan 16, 2018 at 04:40:30PM -0200, Adonay Felipe Nogueira wrote:
> I didn't test this yet, but I was wondering about `sudo'
> "-E"/"--preserve-env" option, wasn't it dropped because it would
> conflict with other variables that the user has? Or better yet, because
> it would take package definitions from other places?
> 
> 2017-12-04T10:07:40+0100 Ludovic Courtès wrote:
> > Hello,
> >
> > The problem is that the (gnutls) module is not in the search path of
> > ‘guix substitute’.
> >
> > Usually the solution is to start the daemon using something like:
> >
> >   sudo -E ./pre-inst-env guix-daemon …
> >
> > so that ‘guix-daemon’ inherits the correct values for ‘GUILE_LOAD_PATH’,
> > etc.
> >
> > Does that work for you?
> >
> > We used to have this suggestion in the doc, but it was reverted in
> > commit 73a203450d21241eca50375aeb26fb418b287414.  Leo, do you think we
> > can reinstate it?  I’m not sure why it was reverted in the first place.

I missed this request previously :/

Originally, I reverted the suggestion because it was causing problems
for some users on #guix, and I thought it was risky to propagate the
user's environment into a privileged context.

But perhaps it's not any more risky than using sudo, in general.

Ludo, please let me know if you'd still like me to reinstate the advice
to use `sudo -E`.

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