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Subject: bug#57559: guix pull fails on http status code 503
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Hi Guix,

--8<---------------cut here---------------start------------->8---
$ guix pull
Updating channel 'nonguix' from Git repository at 'https://gitlab.com/nongu=
ix/nonguix'...
guix pull: error: Git error: unexpected http status code: 503
--8<---------------cut here---------------end--------------->8---

It seems reasonable that if a certain channel isn't available, it should
be possible to ignore it and proceed.

Thanks.


--=20
Andr=C3=A9 A. Gomes
"You cannot even find the ruins..."

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To: =?UTF-8?Q?Andr=C3=A9?= A. Gomes <andremegafone@HIDDEN>
Subject: bug#57559: Acknowledgement (guix pull fails on http status code 503)
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Subject: bug#57559: guix pull fails on http status code 503
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Subject: Re: bug#57559: guix pull fails on http status code 503
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<html>
  <head>
    <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF=
-8">
  </head>
  <body>
    <p>On 03-09-2022 13:21, Andr=C3=A9 A. Gomes wrote:<br>
    </p>
    <blockquote type=3D"cite" cite=3D"mid:87wnakn1oq.fsf@HIDDEN">
      <pre class=3D"moz-quote-pre" wrap=3D"">Hi Guix,

--8&lt;---------------cut here---------------start-------------&gt;8---
$ guix pull
Updating channel 'nonguix' from Git repository at '<a class=3D"moz-txt-li=
nk-freetext" href=3D"https://gitlab.com/nonguix/nonguix">https://gitlab.c=
om/nonguix/nonguix</a>'...
guix pull: error: Git error: unexpected http status code: 503
--8&lt;---------------cut here---------------end---------------&gt;8---

It seems reasonable that if a certain channel isn't available, it should
be possible to ignore it and proceed.

Thanks.
</pre>
    </blockquote>
    <p>More concretely:</p>
    <ul>
      <li>if all channels are available --&gt; ok, keep status quo</li>
      <li>if no channels are available --&gt; error, keep status quo<br>
      </li>
      <li>if some but not all channels are available, and there is at
        least one updated channel --&gt; log the missing channels, and
        update the channels that _are_ available (but don't 'ignore' the
        missing channels by removing them!).</li>
      <li>if some but not all channels are available, and none of the
        available channels were updated --&gt; bail out, no progress was
        made and this might be due to lack of connectivity instead of
        lack of updates.<br>
      </li>
    </ul>
    <p>?<br>
    </p>
    <p>Technically, your message can be interpreted as: if I only have a
      single channel, the Guix channel, and it isn't available, it
      should be possible to ignore it and proceed. (Proceed with what?
      It's the only channel, what is there to proceed with.)=C2=A0 To
      actually implement this, we need to be precise.<br>
    </p>
    <p>Greetings,<br>
      Maxime<br>
    </p>
  </body>
</html>

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Message sent to bug-guix@HIDDEN:

Subject: bug#57559: guix pull fails on http status code 503
Resent-From: =?UTF-8?Q?Andr=C3=A9?= A. Gomes <andremegafone@HIDDEN>
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From: =?UTF-8?Q?Andr=C3=A9?= A. Gomes <andremegafone@HIDDEN>
References: <87wnakn1oq.fsf@HIDDEN>
 <dfcfd3df-9083-c63d-94c8-0d310806cc92@HIDDEN>
Date: Sun, 04 Sep 2022 23:27:01 +0300
In-Reply-To: <dfcfd3df-9083-c63d-94c8-0d310806cc92@HIDDEN> (Maxime Devos's
 message of "Sat, 3 Sep 2022 19:27:30 +0200")
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Maxime Devos <maximedevos@HIDDEN> writes:

> More concretely:
>
> * if all channels are available --> ok, keep status quo
> * if no channels are available --> error, keep status quo
> * if some but not all channels are available, and there is at least one
>   updated channel --> log the missing channels, and update the channels
>   that _are_ available (but don't 'ignore' the missing channels by
>   removing them!).
> * if some but not all channels are available, and none of the available
>   channels were updated --> bail out, no progress was made and this
>   might be due to lack of connectivity instead of lack of updates.
>
> ?
>
> Technically, your message can be interpreted as: if I only have a single
> channel, the Guix channel, and it isn't available, it should be possible
> to ignore it and proceed. (Proceed with what? It's the only channel,
> what is there to proceed with.)  To actually implement this, we need to
> be precise.

I'm just a user and unfortunately I don't have a deep understanding of
Guix's internals.

Your concrete description seems to resonate with my expectations.

Thanks.

--=20
Andr=C3=A9 A. Gomes
"You cannot even find the ruins..."

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From: zimoun <zimon.toutoune@HIDDEN>
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Hi Maxime,

On sam., 03 sept. 2022 at 19:27, Maxime Devos <maximedevos@HIDDEN> wrot=
e:

>   * if some but not all channels are available, and there is at least
>     one updated channel --> log the missing channels, and update the
>     channels that _are_ available (but don't 'ignore' the missing
>     channels by removing them!).

What do you mean by =C2=ABbut don't 'ignore' the missing channels by removi=
ng
them!=C2=BB?  Do you mean keep the last revision locally known for this
channel?


Cheers,
simon

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<html>
  <head>
    <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF=
-8">
  </head>
  <body>
    <p><br>
    </p>
    <div class=3D"moz-cite-prefix">On 05-09-2022 10:21, zimoun wrote:<br>=

    </div>
    <blockquote type=3D"cite" cite=3D"mid:87wnais03f.fsf@HIDDEN">
      <pre class=3D"moz-quote-pre" wrap=3D"">On sam., 03 sept. 2022 at 19=
:27, Maxime Devos <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:maxim=
edevos@HIDDEN" moz-do-not-send=3D"true">&lt;maximedevos@HIDDEN&gt=
;</a> wrote:

</pre>
      <blockquote type=3D"cite" style=3D"color: #007cff;">
        <pre class=3D"moz-quote-pre" wrap=3D"">  * if some but not all ch=
annels are available, and there is at least
    one updated channel --&gt; log the missing channels, and update the
    channels that <span class=3D"moz-txt-underscore"><span class=3D"moz-t=
xt-tag">_</span>are<span class=3D"moz-txt-tag">_</span></span> available =
(but don't 'ignore' the missing
    channels by removing them!).
</pre>
      </blockquote>
      <pre class=3D"moz-quote-pre" wrap=3D"">What do you mean by =C2=ABbu=
t don't 'ignore' the missing channels by removing
them!=C2=BB?  Do you mean keep the last revision locally known for this
channel?
</pre>
    </blockquote>
    <p>I'm not sure what you're asking, because of the negatives.</p>
    <p>With "but don't ignore [...] by [...]", I meant that, yes.<br>
    </p>
    <p>If you meant "don't ignore [...] by [...]", then no, with
      'ignoring by removing', I meant, literally removing them.=C2=A0 Mor=
e
      concretely, a situation like this:<br>
    </p>
    <ul>
      <li>In the channels.scm, two channels are declared: guix and
        guix-foo.</li>
      <li>User does "guix pull"; Guix downloads the source code of guix
        and guix-foo.</li>
      <li>Downloading guix failed (503).=C2=A0 As such, Guix decided to
        ignore the guix channel, by removing it from the list of
        channels to build. (The in-memory list I mean, I don't mean
        modifying the channels.smc file)<br>
      </li>
      <li>Guix tries building the guix-foo channel and installing it,
        without the guix channel.</li>
      <li>This cannot work (the guix-foo channel uses modules from guix
        for basic stuff like G-exps, packages, coreutils, ..., and it
        was the removed guix channel that had things
        build-aux/build-self.scm which is required for pulling).</li>
    </ul>
    <p>(It's not unlike double negatives! I first thought of the latter
      interpretation but on second thought you might have meant the
      former.)<br>
    </p>
    <p>Greetings,<br>
      Maxime.<br>
    </p>
  </body>
</html>

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From: zimoun <zimon.toutoune@HIDDEN>
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Hi Maxime,

On Mon, 05 Sep 2022 at 22:20, Maxime Devos <maximedevos@HIDDEN> wrote:
> On 05-09-2022 10:21, zimoun wrote:
>> On sam., 03 sept. 2022 at 19:27, Maxime Devos<maximedevos@HIDDEN>  w=
rote:
>>
>>>    * if some but not all channels are available, and there is at least
>>>      one updated channel --> log the missing channels, and update the
>>>      channels that_are_  available (but don't 'ignore' the missing
>>>      channels by removing them!).
>> What do you mean by =C2=ABbut don't 'ignore' the missing channels by rem=
oving
>> them!=C2=BB?  Do you mean keep the last revision locally known for this
>> channel?
>
> I'm not sure what you're asking, because of the negatives.

[...]

> (It's not unlike double negatives! I first thought of the latter=20
> interpretation but on second thought you might have meant the former.)

IIUC, you have hard time to parse the double-negative you wrote earlier
in this thread. :-)



> With "but don't ignore [...] by [...]", I meant that, yes.
>
> If you meant "don't ignore [...] by [...]", then no, with 'ignoring by=20
> removing', I meant, literally removing them.=C2=A0 More concretely, a=20
> situation like this:
>
>   * In the channels.scm, two channels are declared: guix and guix-foo.
>   * User does "guix pull"; Guix downloads the source code of guix and
>     guix-foo.
>   * Downloading guix failed (503).=C2=A0 As such, Guix decided to ignore =
the
>     guix channel, by removing it from the list of channels to build.
>     (The in-memory list I mean, I don't mean modifying the channels.smc
>     file)
>   * Guix tries building the guix-foo channel and installing it, without
>     the guix channel.
>   * This cannot work (the guix-foo channel uses modules from guix for
>     basic stuff like G-exps, packages, coreutils, ..., and it was the
>     removed guix channel that had things build-aux/build-self.scm which
>     is required for pulling).

The initial report by Andr=C3=A9 is about:

--8<---------------cut here---------------start------------->8---
$ guix pull
Updating channel 'nonguix' from Git repository at 'https://gitlab.com/nongu=
ix/nonguix'...
guix pull: error: Git error: unexpected http status code: 503
--8<---------------cut here---------------end--------------->8---

So the situation is more likely: Guix from Savannah is reachable and
guix-foo is not.

For sure, we can discuss the case when Guix is unavailable.  However,
the 'guix channel is special; see all conditionals using =E2=80=99guix-chan=
nel?=E2=80=99.=20=20

Well, %default-guix-channel is somehow a corner use-case when the
regular use-case seems about a failure of additional channels.


Cheers,
simon

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Hi Maxime,

On Thu, 08 Sep 2022 at 02:55, Maxime Devos <maximedevos@HIDDEN> wrote:

>> Well, %default-guix-channel is somehow a corner use-case when the
>> regular use-case seems about a failure of additional channels.
>
> The =E2=80=98Guix is unavailable=E2=80=99 was just a simple example. For =
the example,=20
> you can replace it, with, say nonguix. Automatically removing the=20
> additional channels upon 503 is undesirable I'd think, though the error=20
> messages will be different.

My point is that =E2=80=99Guix is unavailable=E2=80=99 is special and it ap=
pears to me
expected to raise an error.  Other said,

 1. if %default-guix-channel (or its mirrors) is unreachable,
    then stop the pull; as it is currently done.
 2. if an extra channel is unreachable,
    then keep the last local revision of this channel
    and try the others.

For sure, #2 can break the whole pull if something in the Guix channel
changed *and* the channel depends on this something.  But we cannot do
more than raise an error.


Cheers,
simon

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Hi Maxime,

On Thu, 08 Sep 2022 at 11:23, Maxime Devos <maximedevos@HIDDEN> wrote:

> Looking at 'latest-channel-instances', the code for deciding what the
> latest version is, is the same for the guix channel and any other
> channel.=C2=A0 As such, the 'Guix is unavailable' is, currently, not spec=
ial.

Well, =E2=80=99latest-channel-instances=E2=80=99 relies on =E2=80=99latest-=
channel-instance=E2=80=99
which tests =E2=80=99guix-channel?=E2=80=99,

--8<---------------cut here---------------start------------->8---
(define (guix-channel? channel)
  "Return true if CHANNEL is the 'guix' channel."
  (eq? 'guix (channel-name channel)))
--8<---------------cut here---------------end--------------->8---

then, for instance, the occurrences are:

--8<---------------cut here---------------start------------->8---
12 candidates:
./guix/channels.scm:79:            guix-channel?
./guix/channels.scm:192:(define (guix-channel? channel)
./guix/channels.scm:199:  (if (and (guix-channel? chan)
./guix/channels.scm:424:            (when (guix-channel? channel)
./guix/channels.scm:437:    (when (guix-channel? channel)
./guix/channels.scm:778:            (guix-channel? (channel-instance-channe=
l instance)))
./guix/channels.scm:903:        (item (if (guix-channel? channel)
./guix/scripts/pull.scm:775:        (match (find guix-channel? channels)
./guix/scripts/pull.scm:788:                   (remove guix-channel? channe=
ls))))
./gnu/packages/package-management.scm:125:                                g=
uix-channel?
./gnu/packages/package-management.scm:618:   (delay (match (or (find guix-c=
hannel? (current-channels))
./gnu/ci.scm:478:    (find guix-channel? channels))
--8<---------------cut here---------------end--------------->8---

And my point is that the Guix channel is special when pulling.
Therefore, we could split the cases when the Guix channel is unreachable
and when other extra-channels are unreachable; because the impact are
different, IMHO.

As I pointed earlier in the thread, the main issue is when these extra
channels are unreachable; as Andr=C3=A9 have initially reported.


Cheers,
simon

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From: =?UTF-8?Q?Andr=C3=A9?= A. Gomes <andremegafone@HIDDEN>
In-Reply-To: <87wnakn1oq.fsf@HIDDEN> ("=?UTF-8?Q?Andr=C3=A9?= A.
 Gomes"'s message of "Sat, 03 Sep 2022 14:21:25 +0300")
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Andr=C3=A9 A. Gomes <andremegafone@HIDDEN> writes:

> Hi Guix,
>
> $ guix pull
> Updating channel 'nonguix' from Git repository at 'https://gitlab.com/non=
guix/nonguix'...
> guix pull: error: Git error: unexpected http status code: 503
>
> It seems reasonable that if a certain channel isn't available, it should
> be possible to ignore it and proceed.

Hi Guix,

In the same spirit as the report above, invoking guix pull replied:

--8<---------------cut here---------------start------------->8---
Updating channel 'nonguix' from Git repository at 'https://gitlab.com/nongu=
ix/nonguix'...
Updating channel 'aadcg' from Git repository at 'https://github.com/aadcg/a=
adcg-guix-channel'...
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.or=
g/git/guix.git'...
guix pull: error: Git error: unexpected http status code: 502
--8<---------------cut here---------------end--------------->8---

I'd would be helpful to see which channel failed and continue the
operation with the channels that are operational.

Thanks.


--=20
Andr=C3=A9 A. Gomes
"You cannot even find the ruins..."

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