Guix substitute timeout

[Christopher Baines]

Hey,

I'm unsure how well the substituter copes with unreliable network
connections, anecdotally it seems to often hang indefinitely.

Looking at the code [1], there is some code that looks like it would
cancel the substitution after some amount of time, but it also looks to
be disabled (as #:timeout? is #f when fetch is called).

Is this something that was never enabled, or does it need to be enabled
in some way?

Thanks,

Chris

1: 
https://git.savannah.gnu.org/cgit/guix.git/tree/guix/scripts/substitute.scm?id=1719f4f1e3aba3af60b5f7e63b8db529ef777af5#n1041

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