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doc: Mention 'guix challenge' in "Features". 

* doc/guix.texi (Features): Mention trust and 'guix challenge'.
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Ludovic Courtès 2016-03-25 23:53:40 +01:00
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@ -1264,7 +1264,10 @@ deployment}. When a pre-built binary for a @file{/gnu/store} item is
available from an external source---a @dfn{substitute}, Guix just
downloads it and unpacks it;
otherwise, it builds the package from source, locally
(@pxref{Substitutes}).
(@pxref{Substitutes}). Because build results are usually bit-for-bit
reproducible, users do not have to trust servers that provide
substitutes: they can force a local build and @emph{challenge} providers
(@pxref{Invoking guix challenge}).
Control over the build environment is a feature that is also useful for
developers. The @command{guix environment} command allows developers of