GNU logs - #54304, boring messages


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The removed code below affected two locations where Elixir uses Git:

* At build-time, Git is used to see if the build is inside a Git repo and i=
f so, git info
  is added to the build information that Elixir returns with `System.build_=
info()`. The code
  uses PATH + `git` so the Git version from the inputs is used which is jus=
t fine.
* At run-time, Git is used by Mix if, and only if, there are any Git-based =
dependencies. This
  is not the normal case, and in that sense Git is an optional dependency o=
f Elixir - most
  projects will work just fine without Git being present. Here, too, PATH +=
 `git` is used
  so if there is a need on a user's system to use Git-based dependencies, t=
he user can just
  add the package to the profile and things will just work.

I feel that leaving this alone is cleaner than trying to fix the dependency=
 (if we want to
keep it, it needs to be in propagated-inputs in order to keep Git around; I=
 stumbled upon
this building a project with Git dependencies after doing a `guix gc`. Howe=
ver, given that
using Git dependencies is the exception and I think that minimizing depende=
ncies is nicer
I opted to just remove the substition completely).

---
 gnu/packages/elixir.scm | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/gnu/packages/elixir.scm b/gnu/packages/elixir.scm
index 55e17f2901..f509c59ee3 100644
--- a/gnu/packages/elixir.scm
+++ b/gnu/packages/elixir.scm
@@ -60,11 +60,6 @@ (define-public elixir
               (for-each make-file-writable (find-files "."))))
           (add-after 'make-git-checkout-writable 'replace-paths
             (lambda* (#:key inputs #:allow-other-keys)
-              (substitute* '("lib/elixir/lib/system.ex"
-                             "lib/mix/lib/mix/scm/git.ex")
-                (("(cmd\\(['\"])git" _ prefix)
-                 (string-append prefix
-                                (search-input-file inputs "/bin/git"))))
               (substitute* '("lib/mix/lib/mix/release.ex"
                              "lib/mix/lib/mix/tasks/release.init.ex")
                 (("#!/bin/sh")
--
2.34.0





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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Cees de Groot <cg@HIDDEN>
Subject: bug#54304: Acknowledgement ([PATCH] Don't fix git executable
 location during Elixir build)
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Subject: [bug#54304] [PATCH] Don't fix git executable location during Elixir build
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Cees de Groot schreef op di 08-03-2022 om 20:52 [+0000]:
> I feel that leaving this alone is cleaner than trying to fix the dependen=
cy (if we want to
> keep it, it needs to be in propagated-inputs in order to keep Git around;

Instead of propagation, I recommend substitution, like done currently.
Propagation is not necessary to =E2=80=98keep git around=E2=80=99 (assuming=
 that the
store reference is not obfuscated by gzipping or the like).

If it's used at build-time instead of run-time, then git should be
moved to native-inputs, for cross-compilation reasons.

Greetings,
Maxime

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Cees de Groot schreef op di 08-03-2022 om 20:52 [+0000]:
> * At build-time, Git is used to see if the build is inside a Git repo and=
 if so, git info

That cannot ever have worked in the first place, since Guix does not
save the '.git' directory when downloading elixir's source code.

Greetings,
Maxime.

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Cees de Groot schreef op di 08-03-2022 om 20:52 [+0000]:
> =C2=A0 uses PATH + `git` so the Git version from the inputs is used which=
 is just fine.

Due to cross-compilation reasons, this is not fine, it should use the
git from native-inputs instead.

Greetings,
Maxime.

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Cees de Groot schreef op di 08-03-2022 om 20:52 [+0000]:
> * At run-time, Git is used by Mix if, and only if, there are any Git-base=
d dependencies. This
> =C2=A0 is not the normal case, and in that sense Git is an optional depen=
dency of Elixir - most
> =C2=A0 projects will work just fine without Git being present. Here, too,=
 PATH + `git` is used
> =C2=A0 so if there is a need on a user's system to use Git-based dependen=
cies, the user can just
> =C2=A0 add the package to the profile and things will just work.

If it's optional and not used most of the time, removing
it seems fine to me, though this seems useful information for the
description.  Also, it would be nice if 'elixir' were patched
to emit a nice message when 'git' is not found.  Suggestion:

  This project required 'git', but it is not in $PATH.  It can be
  installed into the user profile with `guix install git`.

You might want to contact whoever added the substitution originally,
to see what the original reasons were.

Greetings,
Maxime.

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Cees de Groot schreef op wo 09-03-2022 om 02:39 [+0000]:
> > [...]
> > That cannot ever have worked in the first place, since Guix
> > does not save the '.git' directory when downloading elixir's source
> > code.

> That=E2=80=99s correct and fine. The info is informational at most =C2=A0

How can being completely broken be correct and fine?

Greetings,
Maxime.

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From the docs:

":revision - short Git revision hash. If Git was not available at building =
time, it is set to """ (https://hexdocs.pm/elixir/System.html#build_info/0)

So if git is not available - either because the executable is not there or =
because the build checkout is not from Git, the revision hash is set to the=
 empty string, which is in accordance with the docs and what the Guix build=
 has been doing all along (because, as you said, at build time, .git isn't =
there).

So for build time, cross-compiling or not, we don't need Git.

------- Original Message -------

On Wednesday, March 9th, 2022 at 02:31, Maxime Devos <maximedevos@HIDDEN=
e> wrote:

> Cees de Groot schreef op wo 09-03-2022 om 02:39 [+0000]:
>
> > > [...]
> > >
> > > That cannot ever have worked in the first place, since Guix
> > >
> > > does not save the '.git' directory when downloading elixir's source
> > >
> > > code.
>
> > That=E2=80=99s correct and fine. The info is informational at most
>
> How can being completely broken be correct and fine?
>
> Greetings,
>
> Maxime.




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I think changing the behaviour of a programming language just to be helpful=
 to developers is something that one may consider for upstream, but certain=
ly not in the context of a packaging system like Guix - that just will bree=
d confusion.

As it is, the error message thrown by Elixir when Git is not there is very =
easy to interpret for developers (and _only_ at development time can this h=
appen!), no need to go overboard here. Unless, of course, you think it is u=
seful to submit an upstream patch, feel free to do so.

------- Original Message -------

On Tuesday, March 8th, 2022 at 17:22, Maxime Devos <maximedevos@HIDDEN>=
 wrote:

> Cees de Groot schreef op di 08-03-2022 om 20:52 [+0000]:
>
> > * At run-time, Git is used by Mix if, and only if, there are any Git-ba=
sed dependencies. This
> >
> > =C2=A0 is not the normal case, and in that sense Git is an optional dep=
endency of Elixir - most
> >
> > =C2=A0 projects will work just fine without Git being present. Here, to=
o, PATH + `git` is used
> >
> > =C2=A0 so if there is a need on a user's system to use Git-based depend=
encies, the user can just
> >
> > =C2=A0 add the package to the profile and things will just work.
>
> If it's optional and not used most of the time, removing
>
> it seems fine to me, though this seems useful information for the
>
> description. Also, it would be nice if 'elixir' were patched
>
> to emit a nice message when 'git' is not found. Suggestion:
>
> This project required 'git', but it is not in $PATH. It can be
>
> installed into the user profile with `guix install git`.
>
> You might want to contact whoever added the substitution originally,
>
> to see what the original reasons were.
>
> Greetings,
>
> Maxime.




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> Propagation is not necessary to =E2=80=98keep git around=E2=80=99 (assumi=
ng that the

Well.... the whole reason that I stumbled upon this was that the compile-ti=
me substitution referred to a Git version that got GC'd. And I think that t=
hat is the different between regular inputs and propagated inputs, whether =
inputs become eligible for GC at run-time or not. If I'm misunderstanding s=
omething there, something else caused that version of Git to get GC'd and I=
'd be more than happy to be corrected in my assumptions.




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On 9 March 2022 17:35:25 UTC, Cees de Groot <cg@evrl=2Ecom> wrote:
>> Propagation is not necessary to =E2=80=98keep git around=E2=80=99 (assu=
ming that the
>
>Well=2E=2E=2E=2E the whole reason that I stumbled upon this was that the =
compile-time substitution referred to a Git version that got GC'd=2E

This simply Should Not happen=2E  Guix's GC model (inherited from Nix) is =
brutally simple: if the raw string /gnu/store/xxx occurs anywhere within a =
protected /gnu/store/yyy (e=2Eg=2E in a binary), then xxx is also protected=
, recursively=2E

Assuming those assumptions hold here it's a 'mystery' why git got GC'd=2E =
 From experience and for our collective peace of mind I'd say it's more lik=
ely that they didn't hold somehow, than that there's a serious GC bug :-)

> And I think that that is the different between regular inputs and propag=
ated inputs, whether inputs become eligible for GC at run-time or not=2E

So, no=2E  Completely unrelated=2E  The GC has no concept of time at all=
=2E  This isn't Gentoo=2E

Propagated inputs are 'oh, here's this extra thing I was unable to properl=
y patch, please add it to the profile and treat it as a GC reference anyway=
'=2E

This is ugly and regular, non-propagated inputs are always preferred=2E  S=
ome software just makes them too painful=2E
Cees,

Kind regards,

T G-R

Sent on the go=2E  Excuse or enjoy my brevity=2E




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Cees de Groot schreef op wo 09-03-2022 om 17:31 [+0000]:
> I think changing the behaviour of a programming language just to be helpf=
ul to developers

Developers are users too and users can be developers.  Furthermore,
Elixir is an implementation of a programming language, so aren't all
users of Elixir automatically developers?

I'm not sure how exactly Elixir integrates with git but I assume the
integration can be very useful.

Also, this does not change the behaviour of the language, it only
adjusts a detail of the implementation: the error message for
indicating that git is missing is adjusted.

>  is something that one may consider for upstream, but certainly not in th=
e context
>  of a packaging system like Guix - that just will breed confusion.

How could better error messages breed confusion?

Also, this seems a change that would absolutely _not_ be considered
upstream.  Why would upstream have distro-specific error messages?  If
the new error message is Guix-specific, wouldn't Guix be the logical
place to have it?

Greetings,
Maxime.

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Subject: [bug#54304] [PATCH] Don't fix git executable location during Elixir build
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On Wednesday, March 9th, 2022 at 12:59, Tobias Geerinckx-Rice <me@HIDDEN=
> wrote:

> This simply Should Not happen. Guix's GC model (inherited from Nix) is br=
utally simple: if the raw string /gnu/store/xxx occurs anywhere within a pr=
otected /gnu/store/yyy (e.g. in a binary), then xxx is also protected, recu=
rsively.

So how does Guix figure out what to keep and what not? I mean, in this case=
 the patched string will land in a compiled .BEAM file which very well may =
have the string obfuscated (I need to check how the VM stores strings in bi=
naries).





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