GNU bug report logs - #40412
cargo-build-system hides the package dependency graph

Message received at submit <at> debbugs.gnu.org:

Received: (at submit) by debbugs.gnu.org; 3 Apr 2020 17:44:20 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Fri Apr 03 13:44:20 2020
Received: from localhost ([127.0.0.1]:43160 helo=debbugs.gnu.org)
	by debbugs.gnu.org with esmtp (Exim 4.84_2)
	(envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>)
	id 1jKQMe-0004co-Bs
	for submit <at> debbugs.gnu.org; Fri, 03 Apr 2020 13:44:20 -0400
Received: from lists.gnu.org ([209.51.188.17]:59858)
 by debbugs.gnu.org with esmtp (Exim 4.84_2)
 (envelope-from <leo@HIDDEN>) id 1jKQMc-0004cb-Uo
 for submit <at> debbugs.gnu.org; Fri, 03 Apr 2020 13:44:19 -0400
Received: from eggs.gnu.org ([2001:470:142:3::10]:41653)
 by lists.gnu.org with esmtp (Exim 4.90_1)
 (envelope-from <leo@HIDDEN>) id 1jKQMb-0007Pe-IN
 for bug-guix@HIDDEN; Fri, 03 Apr 2020 13:44:18 -0400
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org
X-Spam-Level: 
X-Spam-Status: No, score=0.1 required=5.0 tests=BAYES_50,RCVD_IN_DNSWL_LOW,
 URIBL_BLOCKED autolearn=disabled version=3.3.2
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
 (envelope-from <leo@HIDDEN>) id 1jKQMa-0007vS-C2
 for bug-guix@HIDDEN; 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@HIDDEN>) id 1jKQMa-0007sj-4V
 for bug-guix@HIDDEN; Fri, 03 Apr 2020 13:44:16 -0400
Received: from compute2.internal (compute2.nyi.internal [10.202.2.42])
 by mailout.nyi.internal (Postfix) with ESMTP id BE50C5C0170;
 Fri,  3 Apr 2020 13:44:14 -0400 (EDT)
Received: from mailfrontend1 ([10.202.2.162])
 by compute2.internal (MEProxy); Fri, 03 Apr 2020 13:44:14 -0400
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=famulari.name;
 h=date:from:to:subject:message-id:mime-version:content-type
 :content-transfer-encoding; s=mesmtp; bh=VshSlnlzyRK9Y8sAu88JPdF
 j4CtWJO5uwAn20f7A1Pw=; b=J6CuVcWZsSy8yvRhQ8Sae2c/JrnpHgxgbM78ArN
 YoO0dXgWevSvpX/8v1PSZmsQKq0CBG+49tsHUCj1cP+t0AC2kBpZ6wix78qr/Y+D
 fFynOcO9eqnrL98ZUYhCGy3clc0ldAHip1wInSc10ZWhvlEHF6Loduagtxx/YWS7
 N4Gg=
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=
 messagingengine.com; h=content-transfer-encoding:content-type
 :date:from:message-id:mime-version:subject:to:x-me-proxy
 :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=VshSln
 lzyRK9Y8sAu88JPdFj4CtWJO5uwAn20f7A1Pw=; b=Mn0VUCHirfM16VKDfNzErF
 gjgBCIzCzJuIUccwcOW6Ujr0Zc4PFb/iYwsD1W1Kp1ePDHxzUIKc2GqUak8lJGK4
 M4tCksqkznCDD3ubUVk9x3g9qTldXlMhKdCQcx2zElJAasTVjZgs4knEOv6gql28
 lQ88BAg3rr0DOqYv5AzmcqISCfn86M54Nm4rPPzNhNCn3h01RBYSVspXJPSreRD0
 LBjm0e0HdoqQn5EPTP7FtlnjtkK2k8mnW6DHXQUCye8BhG/vwHHDLNEGyL5eySYf
 v/HK5/Au5N6y430gfBeQCcjmaRNV7g9UXJOKw6iWBwb7/77AYn5mMwEjogB1wnYg
 ==
X-ME-Sender: <xms:7nWHXmAvhz2HTAnVz6bPx8c4ZvDoydh1Fegdxzccj8FL2sFM9V11_g>
X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduhedrtdeigdduudehucetufdoteggodetrfdotf
 fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen
 uceurghilhhouhhtmecufedttdenucenucfjughrpeffhffvuffkgggtugfgsehtkeertd
 dttdejnecuhfhrohhmpefnvghoucfhrghmuhhlrghrihcuoehlvghosehfrghmuhhlrghr
 ihdrnhgrmhgvqeenucffohhmrghinhepghhnuhdrohhrghenucfkphepjeeirdduvdegrd
 dufeekrdeifeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhr
 ohhmpehlvghosehfrghmuhhlrghrihdrnhgrmhgv
X-ME-Proxy: <xmx:7nWHXr6K3rGKqsR6jqy3XCTZ77wTBC5owzokhF0m6AXFvy34aw7sEQ>
 <xmx:7nWHXi_NQITVJVFPAQe63zJmSLrULUKn00KTY2leOJSYPi9RrREJRQ>
 <xmx:7nWHXsjeruSJTll1zyiBd0_yd21o4kUKQPbHOOcMY4yGLf16g4Xxdw>
 <xmx:7nWHXgd-_YzCZ0xWC5ZZ5UbtKzbnUhr3920fu4Y-tvKh3zzwKI0u1w>
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@HIDDEN>; Fri,  3 Apr 2020 13:44:14 -0400 (EDT)
Date: Fri, 3 Apr 2020 13:44:12 -0400
From: Leo Famulari <leo@HIDDEN>
To: bug-guix@HIDDEN
Subject: cargo-build-system hides the package dependency graph
Message-ID: <20200403174412.GA7784@HIDDEN>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic]
 [fuzzy]
X-Received-From: 66.111.4.28
X-Spam-Score: 0.2 (/)
X-Debbugs-Envelope-To: submit
X-BeenThere: debbugs-submit <at> debbugs.gnu.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: <debbugs-submit.debbugs.gnu.org>
List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe>
List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/>
List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org>
List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help>
List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, 
 <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe>
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
X-Spam-Score: -0.8 (/)

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