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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludovic.courtes@HIDDEN>
To: Simon Tournier <zimon.toutoune@HIDDEN>
Subject: Re: bug#70339: Constructing hg-fetch fixed-output derivation
requires Mercurial
In-Reply-To: <87h6g9w5rt.fsf@HIDDEN> (Simon Tournier's message of "Wed, 10
Apr 2024 18:18:14 +0200")
References: <87h6g9w5rt.fsf@HIDDEN>
Date: Fri, 12 Apr 2024 11:30:00 +0200
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Hello!
Simon Tournier <zimon.toutoune@HIDDEN> skribis:
> $ guix build -S -d hg-commitsigs
> substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
> 3,7 MB will be downloaded:
> /gnu/store/6fya762sz5hjdj04vdn5g3v6zii6f11d-mercurial-6.2.2
> substituting /gnu/store/6fya762sz5hjdj04vdn5g3v6zii6f11d-mercurial-6.2.2.=
..
> downloading from https://ci.guix.gnu.org/nar/lzip/6fya762sz5hjdj04vdn5g3v=
6zii6f11d-mercurial-6.2.2 ...
> mercurial-6.2.2 3.5MiB =
529KiB/s 00:07 =E2=96=95=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=
=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=8F 100.0%
>
> /gnu/store/pkb6zd9xfmxx6rsh4p7w3glh7xqg5sqy-hg-commitsigs-0.1.0-0.b53eb68=
-checkout.drv
>
>
> and it is unexpected.
That running =E2=80=98hg clone=E2=80=99 requires Mercurial isn=E2=80=99t to=
tally unexpected to
me. :-)
> I think it comes from this part:
>
> (hg-fetch '#$(hg-reference-url ref)
> '#$(hg-reference-changeset ref)
> #$output
> #:hg-command (string-append #+hg "/bin/hg"=
)))
>
> from =E2=80=99hg-fetch=E2=80=99 in (guix hg-download). Here the #+hg is =
not required
> because just before there is:
>
> (set-path-environment-variable "PATH" '("bin")
> (match '#+inputs
> (((names dirs outputs ...) .=
..)
> dirs)))
Maybe, but one way or another, Mercurial is necessary.
Now, the =E2=80=98guix recover=E2=80=99 tool (or whatever you call it) you=
=E2=80=99re working on
could create a different fixed-output derivation producing the same
result but without using Mercurial; typically, the builder of that
derivation would download from SWH.
Does that make sense?
HTH,
Ludo=E2=80=99.
bug-guix@HIDDEN:bug#70339; Package guix.
Full text available.
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From: Simon Tournier <zimon.toutoune@HIDDEN>
To: bug-guix@HIDDEN
Subject: Constructing hg-fetch fixed-output derivation requires Mercurial
Date: Wed, 10 Apr 2024 18:18:14 +0200
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Content preview: Hi, For instance, --8<cut herestart>8--- $ guix build -S -d
hg-commitsigs substitute: updating substitutes from
'https://ci.guix.gnu.org'...
100.0% 3,7 MB will be downloaded: [...]
Content analysis details: (1.8 points, 10.0 required)
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Hi,
For instance,
--8<---------------cut here---------------start------------->8---
$ guix build -S -d hg-commitsigs
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
3,7 MB will be downloaded:
/gnu/store/6fya762sz5hjdj04vdn5g3v6zii6f11d-mercurial-6.2.2
substituting /gnu/store/6fya762sz5hjdj04vdn5g3v6zii6f11d-mercurial-6.2.2...
downloading from https://ci.guix.gnu.org/nar/lzip/6fya762sz5hjdj04vdn5g3v6z=
ii6f11d-mercurial-6.2.2 ...
mercurial-6.2.2 3.5MiB =
529KiB/s 00:07 =E2=96=95=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=
=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=
=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=8F 100.0%
/gnu/store/pkb6zd9xfmxx6rsh4p7w3glh7xqg5sqy-hg-commitsigs-0.1.0-0.b53eb68-c=
heckout.drv
--8<---------------cut here---------------end--------------->8---
and it is unexpected. The construction of the fixed-output derivation
does not need to download stuff; it only needs to compose stuff
detailing how to do. Any download (or build) must happen when running
the derivation itself.
The issue: later =E2=80=93 say 1 or 2 years from now =E2=80=93 the command:
guix time-machone --commit=3D929ddec -- build -S -d hg-commitsigs
will start to build all what Mercurial needs (python etc.). If for some
reasons*, only one of Mercurial dependencies fails then we are doomed.
( Context: I am working on a fixed-output translator; rely on
current strategies for downloading and do not require all the past
stack just for downloading source code. )
I think it comes from this part:
--8<---------------cut here---------------start------------->8---
(hg-fetch '#$(hg-reference-url ref)
'#$(hg-reference-changeset ref)
#$output
#:hg-command (string-append #+hg "/bin/hg")))
--8<---------------cut here---------------end--------------->8---
from =E2=80=99hg-fetch=E2=80=99 in (guix hg-download). Here the #+hg is no=
t required
because just before there is:
(set-path-environment-variable "PATH" '("bin")
(match '#+inputs
(((names dirs outputs ...) ...)
dirs)))
So relying on string "hg" should be enough; as it is done in
=E2=80=99git-fetch/in-band*=E2=80=99 for one example.
Do I miss something?
Cheers,
simon
*reasons of failures: See
https://guix.gnu.org/en/blog/2024/adventures-on-the-quest-for-long-term-re=
producible-deployment
Simon Tournier <zimon.toutoune@HIDDEN>:bug-guix@HIDDEN.
Full text available.bug-guix@HIDDEN:bug#70339; Package guix.
Full text available.
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