GNU bug report logs - #63726
time-machine without options does not get the latest commit

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Simon Tournier <zimon.toutoune <at> gmail.com>
Subject: bug#63726: closed (Re: bug#63726: time-machine without options
 does not get the latest commit)
Date: Fri, 08 Sep 2023 15:40:02 +0000

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Your bug report

#63726: time-machine without options does not get the latest commit

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 63726 <at> debbugs.gnu.org.

-- 
63726: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=63726
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Simon Tournier <zimon.toutoune <at> gmail.com>
Cc: Konrad Hinsen <konrad.hinsen <at> fastmail.net>, 63726-done <at> debbugs.gnu.org
Subject: Re: bug#63726: time-machine without options does not get the latest
 commit
Date: Fri, 08 Sep 2023 17:39:01 +0200

Simon Tournier <zimon.toutoune <at> gmail.com> skribis:

> On Thu, 25 May 2023 at 23:03, Ludovic Courtès <ludo <at> gnu.org> wrote:
>
>>> Now, what I am missing.  The manual says:
>>>
>>>        As for ‘guix pull’, the absence of any options means that the latest
>>>     commit on the master branch will be used.  The command
>>>
>>>          guix time-machine -- build hello
>>>
>>>        will thus build the package ‘hello’ as defined in the master branch,
>>>     which is in general a newer revision of Guix than you have installed.
>>>     Time travel works in both directions!
>
> [...]
>
>> Should we fix the doc or should we fix the code?…
>
> All seems fixed so let close it?

Yes, done!

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From: Simon Tournier <zimon.toutoune <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: time-machine without options does not get the latest commit
Date: Thu, 25 May 2023 15:52:26 +0200

Hi,

Well, I do not know if it is a bug or if I misuse something.  Feel free
to close if I am missing a point.

--8<---------------cut here---------------start------------->8---
$ guix describe
Generation 25	mai 19 2023 13:30:14	(current)
  guix 14c0380
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 14c03807ba4bc81d42cf869f5b827f7da54ff843

$ git -C ~/.cache/guix/checkouts/pjmkglp4t7znuugeurpurzikxq3tnlaywmisyr27shj7apsnalwq log --oneline -1
14c03807ba4 (HEAD -> master) gnu: ruby-3.2: Upgrade to 3.2.2 [fixes CVE-2023-{28755, 28756}].
--8<---------------cut here---------------end--------------->8---

Well, that’s just a luck that both commit hash matches.

Now, what I am missing.  The manual says:

       As for ‘guix pull’, the absence of any options means that the latest
    commit on the master branch will be used.  The command

         guix time-machine -- build hello

       will thus build the package ‘hello’ as defined in the master branch,
    which is in general a newer revision of Guix than you have installed.
    Time travel works in both directions!

and I get:

--8<---------------cut here---------------start------------->8---
$ guix time-machine -- describe
  guix e499cb2
    repository URL: https://git.savannah.gnu.org/git/guix.git
    commit: e499cb2c12d7f1c6d2f004364c9cc7bdb7e38cd5
--8<---------------cut here---------------end--------------->8---

But I do not understand from where this commit hash is coming from.  And
please note that this commit seems coming from my previous experiments
reported in #63667 [1].

Well, the last commit seems a9cde26133b,

--8<---------------cut here---------------start------------->8---
$ git -C ~/.cache/guix/checkouts/pjmkglp4t7znuugeurpurzikxq3tnlaywmisyr27shj7apsnalwq log origin/master --oneline -1
a9cde26133b (origin/master, origin/HEAD) gnu: Add mouseloupe.
--8<---------------cut here---------------end--------------->8---

Therefore, let create a Guix revision:

--8<---------------cut here---------------start------------->8---
$ guix time-machine --commit=a9cde26133b -- describe
  guix a9cde26
    repository URL: https://git.savannah.gnu.org/git/guix.git
    commit: a9cde26133bd98498869a3528d9dff0d3f456a96
--8<---------------cut here---------------end--------------->8---

However, still this e499cb2 one:

--8<---------------cut here---------------start------------->8---
$ guix time-machine -- describe
  guix e499cb2
    repository URL: https://git.savannah.gnu.org/git/guix.git
    commit: e499cb2c12d7f1c6d2f004364c9cc7bdb7e38cd5
--8<---------------cut here---------------end--------------->8---

Cheers,
simon


1: https://issues.guix.gnu.org/issue/63667

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