Petr,

phodina via 写道：
> However, since I already built the browser and it took several 
> hours
> I'd like to provide it also to other people.

That's very considerate of you.  Thank you!

> Is there a way to submit the outputs of derivation to the 
> official
> substitution server or the only way would be to make public my
> substitution server?

I'm afraid so (the latter).  As you mention, this would require 
trusting the other party but to an unreasonably degree: the 
ability to redistribute arbitrary binaries, signed by the project, 
to all Guix users.

That said, if your substitution server has decent uptime, traffic, 
and a public IP, nothing's stopping you from putting up a 
disclaimer page (like guix.tobias.gr… or better) and serving your 
substitutes to others.

Adding the guix publish service is trivial, about as much work as 
typing ‘guix archive --export’ once, and is a one-time effort!

</promo>

> Correct me if I'm wrong but can't this be solved be verified by
> using guix challenge?

In this case, I don't see how.  Guix challenge is a valuable tool 
but to use it in this way requires a fundamentally trusted party 
(e.g., you, or say, bordeaux.guix.gnu.org) to be distributing 
their own independently-built copy.

If that were the case you wouldn't have had to build it yourself. 
So it could be used after the fact, or for general ‘hm, this is 
interesting’ flagging for further research, and that's not good 
enough here.  Copies would have been distributed by then.

Challenges between 2 supposedly independent unofficial substitute 
providers would be quite vulnerable to various kinds of 
subversion.

Kind regards,

T G-R