GNU logs - #67221, boring messages

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Subject: bug#67221: Package identity transformation produces different derivation
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Date: Wed, 15 Nov 2023 21:56:06 -0600
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$ 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

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Ulf Herrman <striness@HIDDEN>
Subject: bug#67221: Acknowledgement (Package identity transformation
 produces different derivation)
Message-ID: <handler.67221.B.170010703615961.ack <at> debbugs.gnu.org>
References: <87leaye4h5.fsf@HIDDEN>
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Date: Thu, 16 Nov 2023 03:58:02 +0000

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severity 67221 important
quit

Message sent to bug-guix@HIDDEN:

Subject: bug#67221: Package identity transformation produces different derivation
Resent-From: Simon Tournier <zimon.toutoune@HIDDEN>
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Hi,

On Wed, 15 Nov 2023 at 21:56, Ulf Herrman <striness@HIDDEN> wrote:
> $ 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)'
> =3D>
> /gnu/store/51hwf2mc2ig76a3nm86msv4z9az3s0j3-cairo-1.16.0.drv
> /gnu/store/q78ziqcg2dvi2lzj18hzdld85bcydzwk-cairo-1.16.0.drv

The only difference is from the builder: %build-inputs contains

   ("util-linux" . "/gnu/store/gwx2sf5wl9bsl21lwv35g5la63bwyy95-util-linux-=
2.37.4-lib")

for the non-transformed =E2=80=99(@ (gnu packages gtk) cairo-sans-poppler)=
=E2=80=99
package, only.

Hum, is =E2=80=99package-mapping=E2=80=99 removing it?


> 1. (package-mapping identity #:deep? #t) *does* produce the same
>    derivation.

Well, it means that #:deep? #t adds =E2=80=9Cutil-linux=E2=80=9D in the bui=
lder.


Cheers,
simon

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