#67221 Package identity transformation produces different derivation

Message #5 received at submit@debbugs.gnu.org (full text, mbox, reply):

From: Ulf Herrman <striness@tilde.club>

To: bug-guix@gnu.org

Subject: Package identity transformation produces different derivation

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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Message #10 received at 67221@debbugs.gnu.org (full text, mbox, reply):

From: Simon Tournier <zimon.toutoune@gmail.com>

To: Ulf Herrman <striness@tilde.club>, 67221@debbugs.gnu.org

Subject: Re: bug#67221: Package identity transformation produces different derivation

Date: Fri, 12 Jan 2024 11:50:23 +0100

Hi,

On Wed, 15 Nov 2023 at 21:56, Ulf Herrman <striness@tilde.club> 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)'
> =>
> /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 ’(@ (gnu packages gtk) cairo-sans-poppler)’
package, only.

Hum, is ’package-mapping’ removing it?


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

Well, it means that #:deep? #t adds “util-linux” in the builder.


Cheers,
simon

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