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doc: cookbook: Mention "guix hash -rx" for Git checkouts.

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* doc/guix-cookbook.texi (Extended example): Mention "guix hash -rx ."
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Ludovic Courtès 2020-06-22 16:40:18 +02:00 committed by Ludovic Courtès
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@ -852,6 +852,24 @@ version when packaging programs for a specific commit, following the
Guix contributor guidelines (@pxref{Version Numbers,,, guix, GNU Guix
Reference Manual}).
How does one obtain the @code{sha256} hash that's in there, you ask? By
invoking @command{guix hash} on a checkout of the desired commit, along
the lines:
@example
git clone https://github.com/libgit2/libgit2/
cd libgit2
git checkout v0.26.6
guix hash -rx .
@end example
@command{guix hash -rx} computes a SHA256 hash over the whole directory,
excluding the @file{.git} sub-directory (@pxref{Invoking guix hash,,,
guix, GNU Guix Reference Manual}).
In the future, @command{guix download} will hopefully be able to do
these steps for you, just like it does for regular downloads.
@subsubsection Snippets
Snippets are quoted (i.e. non-evaluated) Scheme code that are a means of patching