bug#33272: guix refresh/download backtrace error when missing nss-certs

[Leo Famulari]

On Mon, Nov 05, 2018 at 09:39:15PM +0100, swedebugia wrote:
> How do we catch the error?

I am basically a novice Schemer still, so you will have to figure out
most of this on your own, unless someone else brings more advice :)

In general, dealing with exceptions in Guile:

https://www.gnu.org/software/guile/manual/html_node/Exceptions.html

There are lots of examples of how to use those mechanisms in the Guix
source code — the error message in your original email comes from a
caught exception in (guix build download).

You'll need to find out what is crashing and generating the backtrace,
and then decide what counts as a failure mode that we want to catch in
that context.

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