GNU logs - #51726, boring messages

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Subject: bug#51726: SWH: =?UTF-8?Q?=E2=80=98lookup-origin-revision=E2=80=99?= can miss tags
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludovic.courtes@HIDDEN>
Date: Tue, 09 Nov 2021 18:11:00 +0100
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Quoting
<https://lists.gnu.org/archive/html/guix-devel/2021-10/msg00291.html>:

--8<---------------cut here---------------start------------->8---
> However, I get this:
>
> $ guix lint -c archival sway=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20
> gnu/packages/wm.scm:1527:5: sway@HIDDEN: scheduled Software Heritage archi=
val

Indeed, I=E2=80=99m getting that as well.

Right now Sway=E2=80=99s origin refers to the =E2=80=9C1.5.1=E2=80=9D tag.

I found the problem:

scheme@(guile-user)> ,use(guix swh)
scheme@(guile-user)> (lookup-origin-revision "https://github.com/swaywm/swa=
y" "1.5.1")
$2 =3D #f
scheme@(guile-user)> (lookup-origin "https://github.com/swaywm/sway")
$3 =3D #<<origin> visits-url: "https://archive.softwareheritage.org/api/1/o=
rigin/https://github.com/swaywm/sway/visits/" type: #<unspecified> url: "ht=
tps://github.com/swaywm/sway">
scheme@(guile-user)> (car (origin-visits $3))
$4 =3D #<<visit> date: #<date nanosecond: 490956 second: 6 minute: 45 hour:=
 14 day: 29 month: 10 year: 2021 zone-offset: 0> origin: "https://github.co=
m/swaywm/sway" url: "https://archive.softwareheritage.org/api/1/origin/http=
s://github.com/swaywm/sway/visit/41/" snapshot-url: "https://archive.softwa=
reheritage.org/api/1/snapshot/10ba0257e3290ce4504c2413f32b9358d72975d6/" st=
atus: full number: 41>
scheme@(guile-user)> (define s (visit-snapshot $4))
scheme@(guile-user)> ,pp (map branch-name (snapshot-branches s))
*** output flushed ***
scheme@(guile-user)> (length (snapshot-branches s))
$6 =3D 1000
scheme@(guile-user)> (filter (lambda (b)
			       (string-prefix? "refs/tags" (branch-name b)))
			     (snapshot-branches s))
$7 =3D ()
scheme@(guile-user)> ,use(srfi srfi-1)
scheme@(guile-user)> ,pp (take (snapshot-branches s) 10)
$8 =3D (#<<branch> name: "refs/pull/2715/head" target-type: revision target=
-url: "https://archive.softwareheritage.org/api/1/revision/2f258eff6fd2c89a=
94caa658c1ea22beb76d728a/">
 #<<branch> name: "refs/pull/2713/head" target-type: revision target-url: "=
https://archive.softwareheritage.org/api/1/revision/4e4898e90f4d9b721091137=
a744deac335e73f12/">
 #<<branch> name: "refs/pull/2712/head" target-type: revision target-url: "=
https://archive.softwareheritage.org/api/1/revision/d129108cddc485299443d0b=
98c3bdf3f9839aa1c/">
 #<<branch> name: "refs/pull/271/head" target-type: revision target-url: "h=
ttps://archive.softwareheritage.org/api/1/revision/20cb390323b19dc0c767ba63=
925def7f51c31044/">
 #<<branch> name: "refs/pull/2709/head" target-type: revision target-url: "=
https://archive.softwareheritage.org/api/1/revision/426c33f4dc2515867a0d3b0=
4cb865d5cad091d10/">
 #<<branch> name: "refs/pull/2708/head" target-type: revision target-url: "=
https://archive.softwareheritage.org/api/1/revision/b1a0e95e8e6ecf66542cc62=
e6109949de59afb5e/">
 #<<branch> name: "refs/pull/2704/head" target-type: revision target-url: "=
https://archive.softwareheritage.org/api/1/revision/6194a445d3b10e8afc96871=
2faccdd1d127a8beb/">
 #<<branch> name: "refs/pull/2703/head" target-type: revision target-url: "=
https://archive.softwareheritage.org/api/1/revision/f16529e2588f5e71d6777f4=
c06dfb58b29308cd0/">
 #<<branch> name: "refs/pull/2701/head" target-type: revision target-url: "=
https://archive.softwareheritage.org/api/1/revision/baeb28ea6230ef9aa409ee5=
2abe208720120e45c/">
 #<<branch> name: "refs/pull/270/head" target-type: revision target-url: "h=
ttps://archive.softwareheritage.org/api/1/revision/a32cbb52ce81ee38d2928ba8=
73ff7fc182df8393/">)

This snapshot has more than 1,000 branches, mostly =E2=80=98refs/pull=E2=80=
=99 branches.
But by default, the endpoint used by =E2=80=98visit-snapshot=E2=80=99 only =
returns the
first 1,000 branches, and then it=E2=80=99s up to the caller to use the
pagination mechanism.

It=E2=80=99s not implemented though!  It turns out the =E2=80=98refs/tags=
=E2=80=99 =E2=80=9Cbranches=E2=80=9D
were not among the first thousand branches, so the code incorrectly
thinks that the tag is missing.

The solution is to implement pagination (yuk!), or to use an endpoint to
look up a branch by name instead of using =E2=80=98snapshot-branches=E2=80=
=99 (is there
such an endpoint?).
--8<---------------cut here---------------end--------------->8---

Ludo=E2=80=99.

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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludovic.courtes@HIDDEN>
Subject: bug#51726: Acknowledgement (SWH: =?UTF-8?Q?=E2=80=98lookup-origin-revision=E2=80=99?=
 can miss tags)
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Date: Tue, 09 Nov 2021 17:12:01 +0000

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severity 51726 important
quit

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