GNU bug report logs - #67221
Package identity transformation produces different derivation

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

Received: (at submit) by debbugs.gnu.org; 16 Nov 2023 03:57:16 +0000
From debbugs-submit-bounces <at> debbugs.gnu.org Wed Nov 15 22:57:16 2023
Received: from localhost ([127.0.0.1]:54268 helo=debbugs.gnu.org)
	by debbugs.gnu.org with esmtp (Exim 4.84_2)
	(envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>)
	id 1r3TVD-00049N-UT
	for submit <at> debbugs.gnu.org; Wed, 15 Nov 2023 22:57:16 -0500
Received: from lists.gnu.org ([2001:470:142::17]:57122)
 by debbugs.gnu.org with esmtp (Exim 4.84_2)
 (envelope-from <striness@HIDDEN>) id 1r3TVB-000499-H6
 for submit <at> debbugs.gnu.org; Wed, 15 Nov 2023 22:57:14 -0500
Received: from eggs.gnu.org ([2001:470:142:3::10])
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <striness@HIDDEN>)
 id 1r3TV4-0000Zo-SW
 for bug-guix@HIDDEN; Wed, 15 Nov 2023 22:57:07 -0500
Received: from tilde.club ([2607:5300:204:4340::114])
 by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <striness@HIDDEN>)
 id 1r3TV2-0002GB-Ir
 for bug-guix@HIDDEN; Wed, 15 Nov 2023 22:57:05 -0500
Received: by tilde.club (Postfix, from userid 5378)
 id 6AD0F22136F7A; Thu, 16 Nov 2023 03:57:01 +0000 (UTC)
DKIM-Filter: OpenDKIM Filter v2.11.0 tilde.club 6AD0F22136F7A
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=tilde.club; s=mail;
 t=1700107021; bh=Nfk/mauRL819g8G26+04XY6xBVPEq7tImxXA3SkwD3I=;
 h=From:To:Subject:Date:From;
 b=RZKMcobbRITBvgYkq1+FlR0N2EMnmKVlii4U1ONGHs08vpKim360PbCvlC8FR0Bk8
 5IBilev3XO8OeJ7Y2LI8lykdYjUwP9MsxDdHpYlyuTpMNjX1upkvcaIn/Te2ukJ6CR
 /jpZ+IyHJJZofw2dgUIrEmGNIkT+rp4oBtOCkZAw=
From: Ulf Herrman <striness@HIDDEN>
To: bug-guix@HIDDEN
Subject: Package identity transformation produces different derivation
Date: Wed, 15 Nov 2023 21:56:06 -0600
Message-ID: <87leaye4h5.fsf@HIDDEN>
User-Agent: Gnus/5.13 (Gnus v5.13)
MIME-Version: 1.0
Content-Type: multipart/signed; boundary="=-=-=";
 micalg=pgp-sha256; protocol="application/pgp-signature"
Received-SPF: pass client-ip=2607:5300:204:4340::114;
 envelope-from=striness@HIDDEN; helo=tilde.club
X-Spam_score_int: -20
X-Spam_score: -2.1
X-Spam_bar: --
X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,
 DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001,
 SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no
X-Spam_action: no action
X-Spam-Score: 0.9 (/)
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: -0.1 (/)

--=-=-=
Content-Type: text/plain

$ guix build --no-grafts --derivations -e \
     '(begin
       (use-modules (guix packages) (gnu packages gtk))
       ((package-mapping identity) cairo-sans-poppler))' \
       -e '(@ (gnu packages gtk) cairo-sans-poppler)'
=>
/gnu/store/51hwf2mc2ig76a3nm86msv4z9az3s0j3-cairo-1.16.0.drv
/gnu/store/q78ziqcg2dvi2lzj18hzdld85bcydzwk-cairo-1.16.0.drv

Some interesting notes:

1. (package-mapping identity #:deep? #t) *does* produce the same
   derivation.
2. bag->derivation's `delete-duplicates' call uses `input=?', but its
   input objects in the second tuple position are all <gexp-input>s
   produced by `expand-input'.  Consequently, `input=?' will fall back
   to using `equal?' instead of `derivation=?'.  I don't know to what
   extent this has to do with the observed bug.

- ulfvonbelow

--=-=-=
Content-Type: application/pgp-signature; name="signature.asc"

-----BEGIN PGP SIGNATURE-----
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=G53s
-----END PGP SIGNATURE-----
--=-=-=--