From mboxrd@z Thu Jan  1 00:00:00 1970
From: Leo Famulari <leo@famulari.name>
Subject: bug#40412: cargo-build-system hides the package dependency graph
Date: Fri, 3 Apr 2020 13:44:12 -0400
Message-ID: <20200403174412.GA7784@jasmine.lan>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Return-path: <bug-guix-bounces+gcggb-bug-guix=m.gmane-mx.org@gnu.org>
Received: from eggs.gnu.org ([2001:470:142:3::10]:42744)
 by lists.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1jKQNL-0007wh-Ur
 for bug-guix@gnu.org; Fri, 03 Apr 2020 13:45:05 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
 (envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1jKQNK-0000tt-Oo
 for bug-guix@gnu.org; Fri, 03 Apr 2020 13:45:03 -0400
Received: from debbugs.gnu.org ([209.51.188.43]:59847)
 by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
 (Exim 4.71) (envelope-from <Debian-debbugs@debbugs.gnu.org>)
 id 1jKQNK-0000tD-JA
 for bug-guix@gnu.org; Fri, 03 Apr 2020 13:45:02 -0400
Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2)
 (envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1jKQNK-0004fT-ED
 for bug-guix@gnu.org; Fri, 03 Apr 2020 13:45:02 -0400
Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
Resent-Message-ID: <handler.40412.B.158593586017787@debbugs.gnu.org>
Received: from eggs.gnu.org ([2001:470:142:3::10]:41653)
 by lists.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <leo@famulari.name>) id 1jKQMb-0007Pe-IN
 for bug-guix@gnu.org; Fri, 03 Apr 2020 13:44:18 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
 (envelope-from <leo@famulari.name>) id 1jKQMa-0007vS-C2
 for bug-guix@gnu.org; Fri, 03 Apr 2020 13:44:17 -0400
Received: from out4-smtp.messagingengine.com ([66.111.4.28]:42717)
 by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)
 (Exim 4.71) (envelope-from <leo@famulari.name>) id 1jKQMa-0007sj-4V
 for bug-guix@gnu.org; Fri, 03 Apr 2020 13:44:16 -0400
Received: from localhost (c-76-124-138-63.hsd1.pa.comcast.net [76.124.138.63])
 by mail.messagingengine.com (Postfix) with ESMTPA id 776FC3280067
 for <bug-guix@gnu.org>; Fri,  3 Apr 2020 13:44:14 -0400 (EDT)
Content-Disposition: inline
List-Id: Bug reports for GNU Guix <bug-guix.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-guix>,
 <mailto:bug-guix-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/bug-guix>
List-Post: <mailto:bug-guix@gnu.org>
List-Help: <mailto:bug-guix-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-guix>,
 <mailto:bug-guix-request@gnu.org?subject=subscribe>
Errors-To: bug-guix-bounces+gcggb-bug-guix=m.gmane-mx.org@gnu.org
Sender: "bug-Guix" <bug-guix-bounces+gcggb-bug-guix=m.gmane-mx.org@gnu.org>
To: 40412@debbugs.gnu.org

Some Guix commands like `guix graph` and `guix show` don't work as
expected for packages using the cargo-build-system.

The cargo-build-system uses only the source code of a package's
dependencies when building.

To achieve this, the build system does not refer to dependencies with
the usual 'inputs', 'native-inputs', and 'propagated-inputs', but
instead with the Scheme keywords #:cargo-inputs and
#:cargo-development-inputs. [0]

This means that it's not possible to work with the package dependency
graph like with other packages.

As a result, some Guix commands don't work as expected, such as `guix
graph` and `guix show`. I wonder if `guix refresh --update` works?

I'm not sure if this can be improved — there is a comment in ((guix
build-system cargo) expand-crate-sources) that explains why we did it
this way and acknowledges the problems.

[0] For example:
https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/crates-io.scm?id=e7a353ed468a805af6ad6b06b0dc0909393ff8fa#n89