Package identity transformation produces different derivation

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3 participants
  • Ludovic Courtès
  • Ulf Herrman
  • Simon Tournier
Owner
unassigned
Submitted by
Ulf Herrman
Severity
important
U
U
Ulf Herrman wrote on 15 Nov 2023 19:56
(address . bug-guix@gnu.org)
87leaye4h5.fsf@tilde.club
$ 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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L
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Ludovic Courtès wrote on 27 Nov 2023 14:03
control message for bug #67221
(address . control@debbugs.gnu.org)
87a5qyx39q.fsf@gnu.org
severity 67221 important
quit
S
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Simon Tournier wrote on 12 Jan 02:50 -0800
Re: bug#67221: Package identity transformation produces different derivation
87wmsex1u8.fsf@gmail.com
Hi,

On Wed, 15 Nov 2023 at 21:56, Ulf Herrman <striness@tilde.club> wrote:
Toggle quote (9 lines)
> $ 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?


Toggle quote (3 lines)
> 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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