From mboxrd@z Thu Jan  1 00:00:00 1970
From: ng0 <contact.ng0@cryptolab.net>
Subject: Re: guix hash of source from git repository.
Date: Tue, 21 Feb 2017 21:56:29 +0000
Message-ID: <20170221215629.wqrvnhsmr4l5q7zs@wasp>
References: <CAH3JXcGvtfNkD898F-QWajJUcyZEHd=njCcUq7Na0rj-2Q4XEg@mail.gmail.com>
	<CAJ98PDy7Yph4gzBbrxyGdLwsU1C5b1Gw38wu1-3NSGVir6q5iw@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Return-path: <help-guix-bounces+gcggh-help-guix=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:49716)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <contact.ng0@cryptolab.net>) id 1cgIOH-0004jX-T6
	for help-guix@gnu.org; Tue, 21 Feb 2017 16:54:34 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <contact.ng0@cryptolab.net>) id 1cgIOE-0006th-0l
	for help-guix@gnu.org; Tue, 21 Feb 2017 16:54:33 -0500
Received: from latitanza.investici.org ([2001:888:2000:56::19]:40990)
	by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)
	(Exim 4.71) (envelope-from <contact.ng0@cryptolab.net>)
	id 1cgIOD-0006tF-NP
	for help-guix@gnu.org; Tue, 21 Feb 2017 16:54:29 -0500
Content-Disposition: inline
In-Reply-To: <CAJ98PDy7Yph4gzBbrxyGdLwsU1C5b1Gw38wu1-3NSGVir6q5iw@mail.gmail.com>
List-Id: <help-guix.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/help-guix>,
	<mailto:help-guix-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/help-guix/>
List-Post: <mailto:help-guix@gnu.org>
List-Help: <mailto:help-guix-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/help-guix>,
	<mailto:help-guix-request@gnu.org?subject=subscribe>
Errors-To: help-guix-bounces+gcggh-help-guix=m.gmane.org@gnu.org
Sender: "Help-Guix" <help-guix-bounces+gcggh-help-guix=m.gmane.org@gnu.org>
To: Catonano <catonano@gmail.com>
Cc: Dmitry Nikolaev <cameltheman@gmail.com>, help-guix <help-guix@gnu.org>

On 17-02-21 22:25:35, Catonano wrote:
> Hi Dmitry,
> 
> 2017-02-21 22:19 GMT+01:00 Dmitry Nikolaev <cameltheman@gmail.com>:
> 
> > 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...?
> >
> > Dmitry Nikolaev
> >
> 
> You clone the git repository locally, then you use 'guix hash' as explained
> in this page of the manual (the option you want to use is "--recursive")
> 
> https://www.gnu.org/software/guix/manual/html_node/Invoking-guix-hash.html

Please avoid doing the way described below though. Calculating it in
advance is more secure and helps to prevent introducing errors. If
there's a mismatch it shows an error.
 
> Another option is to try to build the package with the wrong hash, wait for
> the error message and copy the right hash from within the error message
> itself. Lame, but hey
> 
> Hope this helps !
> 
> Ciao