From mboxrd@z Thu Jan  1 00:00:00 1970
From: Leo Famulari <leo@famulari.name>
Subject: Re: guix hash of source from git repository.
Date: Tue, 21 Feb 2017 17:17:33 -0500
Message-ID: <20170221221733.GB18231@jasmine>
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To: Dmitry Nikolaev <cameltheman@gmail.com>
Cc: help-guix <help-guix@gnu.org>

On Wed, Feb 22, 2017 at 12:19:35AM +0300, Dmitry Nikolaev wrote:
> When writing package definition, what if I download sources from git
> repository? For example:
> 
> (define-public libwebsockets
>   (package
>     (name "libwebsockets")
>     (version "1.3")
>     (source (origin
>               ;; The project does not publish tarballs, so we have to take
>               ;; things from Git.
>               (method git-fetch)
>               (uri (git-reference
>                     (url "git://git.libwebsockets.org/libwebsockets")
>                     (commit (string-append "v" version
>                                            "-chrome37-firefox30"))))
>               (sha256
>                (base32
>                 "12fqh2d2098mgf0ls19p9lzibpsqhv7mc5rn1yvrbfnazmcr40g4"))
>               (file-name (string-append name "-" version))))
> ...
> 
> How do I calculate this 12fqh2d...?

Clone the Git repository in the normal way, check out the Git commit you
want to base the Guix package on, and then do this:

$ guix hash --recursive --exclude-vcs path/to/git-repo

This is explained in the manual, section Invoking guix hash:

https://www.gnu.org/software/guix/manual/html_node/Invoking-guix-hash.html