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Subject: bug#69284: guix pull is not reproducible
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guix pull -C channels-lock.scm produces different profiles on different
machines.

I executed the same command on a few different machines.
channels-lock.scm contains channels list with exact commit specified.

=2D-8<---------------cut here---------------start------------->8---
curl https://paste.sr.ht/~abcdw/5f18e9e5cc6cb243c84a3975eb4e6a46ed17d996 > =
channels-lock.scm
guix pull -C channels-lock.scm -p tmp
readlink tmp-1-link
=2D-8<---------------cut here---------------end--------------->8---

The output log on all machines starts similiar:
=2D-8<---------------cut here---------------start------------->8---
Updating channel 'rde' from Git repository at 'https://git.sr.ht/~abcdw/rde=
'...
Authenticating channel 'rde', commits 257cebd to 2a0c7e9 (2304 new commits)=
...
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.or=
g/git/guix.git'...
Authenticating channel 'guix', commits 9edb3f6 to d264237 (69420 new commit=
s)...
Building from these channels:
  guix      https://git.savannah.gnu.org/git/guix.git   d264237
  rde       https://git.sr.ht/~abcdw/rde        2a0c7e9
=2D-8<---------------cut here---------------end--------------->8---

=2D-8<---------------cut here---------------start------------->8---
Updating channel 'rde' from Git repository at 'https://git.sr.ht/~abcdw/rde=
'...
Authenticating channel 'rde', commits 257cebd to 2a0c7e9 (2,304 new commits=
)...
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.or=
g/git/guix.git'...
Authenticating channel 'guix', commits 9edb3f6 to d264237 (2,382 new commit=
s)...
Building from these channels:
  guix      https://git.savannah.gnu.org/git/guix.git   d264237
  rde       https://git.sr.ht/~abcdw/rde        2a0c7e9
=2D-8<---------------cut here---------------end--------------->8---

but resulting profile is different:
/gnu/store/w3qq81dzdj9wckcw8fpz5lv6ylhw1m2d-profile (local fresh guix syste=
m)
/gnu/store/c2i8iyqkc146ac2hqzy1v6zkqs82xypp-profile (debian 11)
/gnu/store/svg0is4iwvlg6mgi2rvpkngcccqcvhys-profile (debian 12)
/gnu/store/w3qq81dzdj9wckcw8fpz5lv6ylhw1m2d-profile (remote fresh guix syst=
em)

The first guix pull takes from 25 to 50 minutes, which is really long
time.  However, due to irreproducibility, building the guix profile on
CI doesn't help to cut that time to some manageable numbers.

=2D-=20
Best regards,
Andrew Tropin

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Andrew Tropin <andrew@HIDDEN>
Subject: bug#69284: Acknowledgement (guix pull is not reproducible)
Message-ID: <handler.69284.B.17084263378897.ack <at> debbugs.gnu.org>
References: <874je3xvbn.fsf@HIDDEN>
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X-Gnu-PR-Package: guix
Reply-To: 69284 <at> debbugs.gnu.org
Date: Tue, 20 Feb 2024 10:53:02 +0000

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Message sent to bug-guix@HIDDEN:

Subject: bug#69284: guix pull is not reproducible
Resent-From: Vagrant Cascadian <vagrant@HIDDEN>
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On 2024-02-20, Andrew Tropin wrote:
> guix pull -C channels-lock.scm produces different profiles on different
> machines.
>
> I executed the same command on a few different machines.
> channels-lock.scm contains channels list with exact commit specified.
>
> --8<---------------cut here---------------start------------->8---
> curl https://paste.sr.ht/~abcdw/5f18e9e5cc6cb243c84a3975eb4e6a46ed17d996 > channels-lock.scm
> guix pull -C channels-lock.scm -p tmp
> readlink tmp-1-link
> --8<---------------cut here---------------end--------------->8---
>
> The output log on all machines starts similiar:
> --8<---------------cut here---------------start------------->8---
> Updating channel 'rde' from Git repository at 'https://git.sr.ht/~abcdw/rde'...
> Authenticating channel 'rde', commits 257cebd to 2a0c7e9 (2304 new commits)...
> Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
> Authenticating channel 'guix', commits 9edb3f6 to d264237 (69420 new commits)...
> Building from these channels:
>   guix      https://git.savannah.gnu.org/git/guix.git   d264237
>   rde       https://git.sr.ht/~abcdw/rde        2a0c7e9
> --8<---------------cut here---------------end--------------->8---
>
> --8<---------------cut here---------------start------------->8---
> Updating channel 'rde' from Git repository at 'https://git.sr.ht/~abcdw/rde'...
> Authenticating channel 'rde', commits 257cebd to 2a0c7e9 (2,304 new commits)...
> Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
> Authenticating channel 'guix', commits 9edb3f6 to d264237 (2,382 new commits)...
> Building from these channels:
>   guix      https://git.savannah.gnu.org/git/guix.git   d264237
>   rde       https://git.sr.ht/~abcdw/rde        2a0c7e9
> --8<---------------cut here---------------end--------------->8---
>
> but resulting profile is different:
> /gnu/store/w3qq81dzdj9wckcw8fpz5lv6ylhw1m2d-profile (local fresh guix system)
> /gnu/store/c2i8iyqkc146ac2hqzy1v6zkqs82xypp-profile (debian 11)
> /gnu/store/svg0is4iwvlg6mgi2rvpkngcccqcvhys-profile (debian 12)
> /gnu/store/w3qq81dzdj9wckcw8fpz5lv6ylhw1m2d-profile (remote fresh guix system)
>
> The first guix pull takes from 25 to 50 minutes, which is really long
> time.  However, due to irreproducibility, building the guix profile on
> CI doesn't help to cut that time to some manageable numbers.

Does passing --cores=1 help? I have found building guix (and other guile
packages) on Debian had reproducibility issues frequently triggered by
parallelism.

live well,
  vagrant

--=-=-=
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Subject: bug#69284: guix pull is not reproducible
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--=-=-=
Content-Type: text/plain

On 2024-03-07, Vagrant Cascadian wrote:
> On 2024-02-20, Andrew Tropin wrote:
>> guix pull -C channels-lock.scm produces different profiles on different
>> machines.
>>
>> I executed the same command on a few different machines.
>> channels-lock.scm contains channels list with exact commit specified.
>>
>> --8<---------------cut here---------------start------------->8---
>> curl https://paste.sr.ht/~abcdw/5f18e9e5cc6cb243c84a3975eb4e6a46ed17d996 > channels-lock.scm
>> guix pull -C channels-lock.scm -p tmp
>> readlink tmp-1-link
>> --8<---------------cut here---------------end--------------->8---
>>
>> The output log on all machines starts similiar:
>> --8<---------------cut here---------------start------------->8---
>> Updating channel 'rde' from Git repository at 'https://git.sr.ht/~abcdw/rde'...
>> Authenticating channel 'rde', commits 257cebd to 2a0c7e9 (2304 new commits)...
>> Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
>> Authenticating channel 'guix', commits 9edb3f6 to d264237 (69420 new commits)...
>> Building from these channels:
>>   guix      https://git.savannah.gnu.org/git/guix.git   d264237
>>   rde       https://git.sr.ht/~abcdw/rde        2a0c7e9
>> --8<---------------cut here---------------end--------------->8---
>>
>> --8<---------------cut here---------------start------------->8---
>> Updating channel 'rde' from Git repository at 'https://git.sr.ht/~abcdw/rde'...
>> Authenticating channel 'rde', commits 257cebd to 2a0c7e9 (2,304 new commits)...
>> Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
>> Authenticating channel 'guix', commits 9edb3f6 to d264237 (2,382 new commits)...
>> Building from these channels:
>>   guix      https://git.savannah.gnu.org/git/guix.git   d264237
>>   rde       https://git.sr.ht/~abcdw/rde        2a0c7e9
>> --8<---------------cut here---------------end--------------->8---
>>
>> but resulting profile is different:
>> /gnu/store/w3qq81dzdj9wckcw8fpz5lv6ylhw1m2d-profile (local fresh guix system)
>> /gnu/store/c2i8iyqkc146ac2hqzy1v6zkqs82xypp-profile (debian 11)
>> /gnu/store/svg0is4iwvlg6mgi2rvpkngcccqcvhys-profile (debian 12)
>> /gnu/store/w3qq81dzdj9wckcw8fpz5lv6ylhw1m2d-profile (remote fresh guix system)
>>
>> The first guix pull takes from 25 to 50 minutes, which is really long
>> time.  However, due to irreproducibility, building the guix profile on
>> CI doesn't help to cut that time to some manageable numbers.
>
> Does passing --cores=1 help? I have found building guix (and other guile
> packages) on Debian had reproducibility issues frequently triggered by
> parallelism.

See also:

  https://tests.reproducible-builds.org/debian/issues/unstable/nondeterministic_ordering_in_guile_binaries_issue.html
  https://bugs.debian.org/995092
  https://github.com/NixOS/nixpkgs/pull/78778
  https://issues.guix.gnu.org/issue/20272
  https://build.opensuse.org/request/show/732638

live well,
  vagrant

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On 2024-03-07 12:45, Vagrant Cascadian wrote:

> On 2024-02-20, Andrew Tropin wrote:
>> guix pull -C channels-lock.scm produces different profiles on different
>> machines.
>>
>> I executed the same command on a few different machines.
>> channels-lock.scm contains channels list with exact commit specified.
>>
>> --8<---------------cut here---------------start------------->8---
>> curl https://paste.sr.ht/~abcdw/5f18e9e5cc6cb243c84a3975eb4e6a46ed17d996=
 > channels-lock.scm
>> guix pull -C channels-lock.scm -p tmp
>> readlink tmp-1-link
>> --8<---------------cut here---------------end--------------->8---
>>
>> The output log on all machines starts similiar:
>> --8<---------------cut here---------------start------------->8---
>> Updating channel 'rde' from Git repository at 'https://git.sr.ht/~abcdw/=
rde'...
>> Authenticating channel 'rde', commits 257cebd to 2a0c7e9 (2304 new commi=
ts)...
>> Updating channel 'guix' from Git repository at 'https://git.savannah.gnu=
.org/git/guix.git'...
>> Authenticating channel 'guix', commits 9edb3f6 to d264237 (69420 new com=
mits)...
>> Building from these channels:
>>   guix      https://git.savannah.gnu.org/git/guix.git   d264237
>>   rde       https://git.sr.ht/~abcdw/rde        2a0c7e9
>> --8<---------------cut here---------------end--------------->8---
>>
>> --8<---------------cut here---------------start------------->8---
>> Updating channel 'rde' from Git repository at 'https://git.sr.ht/~abcdw/=
rde'...
>> Authenticating channel 'rde', commits 257cebd to 2a0c7e9 (2,304 new comm=
its)...
>> Updating channel 'guix' from Git repository at 'https://git.savannah.gnu=
.org/git/guix.git'...
>> Authenticating channel 'guix', commits 9edb3f6 to d264237 (2,382 new com=
mits)...
>> Building from these channels:
>>   guix      https://git.savannah.gnu.org/git/guix.git   d264237
>>   rde       https://git.sr.ht/~abcdw/rde        2a0c7e9
>> --8<---------------cut here---------------end--------------->8---
>>
>> but resulting profile is different:
>> /gnu/store/w3qq81dzdj9wckcw8fpz5lv6ylhw1m2d-profile (local fresh guix sy=
stem)
>> /gnu/store/c2i8iyqkc146ac2hqzy1v6zkqs82xypp-profile (debian 11)
>> /gnu/store/svg0is4iwvlg6mgi2rvpkngcccqcvhys-profile (debian 12)
>> /gnu/store/w3qq81dzdj9wckcw8fpz5lv6ylhw1m2d-profile (remote fresh guix s=
ystem)
>>
>> The first guix pull takes from 25 to 50 minutes, which is really long
>> time.  However, due to irreproducibility, building the guix profile on
>> CI doesn't help to cut that time to some manageable numbers.
>
> Does passing --cores=3D1 help? I have found building guix (and other guile
> packages) on Debian had reproducibility issues frequently triggered by
> parallelism.

I don't think that hash of the profile depends on the building process
itself.  And it seems on the same system it returns the same result on
consequent rebuilds.  It seems something leaks from the environment.

=2D-=20
Best regards,
Andrew Tropin

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Hi Andrew,

Andrew Tropin via Bug reports for GNU Guix <bug-guix@HIDDEN> writes:

> I don't think that hash of the profile depends on the building process
> itself.  And it seems on the same system it returns the same result on
> consequent rebuilds.  It seems something leaks from the environment.

Yes, it's rather that the .drv themselves are not reproducible
apparently.  Can you compare the derivations building the guixes in the
different profiles?  You can look at them using first `guix gc
=2D-derivers` on the profile and then analyzing the .drv manually.  I
remember seeing the same thing, but I don't really remember anything
conclusive.

One thing I can say is that Guix generates the .drv dynamically by
looking at the check-out.  If the checkout is somehow tainted (as it has
often happened, maybe because of libgit2?), the .drv can end up being
different.  If you retry by first resetting the Guix checkouts in
~/.cache/guix/checkouts/ to a pristine state, do you still get a
discrepancy?

Best,
=2D-=20
Josselin Poiret

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