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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Hi Roland,

Quoting Roland Clobus (2022-09-18 10:58:37)

I'm looking for 'the' timestamp of the Debian Archive, which will allow me to virtually travel through time to re-generate a specific state of Debian.

Holger just suggested on IRC that I reply to your mail -- probably with my metasnap.debian.net and debbisect hats on -- even though there are probably other people who understand snapshot.d.o better than me. I am wondering though: what is it exactly you want to achieve? If you want to go back in time, then snapshot.d.o already does what you want, no?

What is it that you want to do in the end?

Thanks!

cheers, josch
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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Sun, Sep 18, 2022 at 01:56:14PM +0200, Johannes Schauer Marin Rodrigues wrote:

Hi Roland,

Quoting Roland Clobus (2022-09-18 10:58:37)

I'm looking for 'the' timestamp of the Debian Archive, which will allow me to
virtually travel through time to re-generate a specific state of Debian.

Holger just suggested on IRC that I reply to your mail -- probably with my metasnap.debian.net and debbisect hats on -- even though there are probably other people who understand snapshot.d.o better than me. I am wondering though:
what is it exactly you want to achieve? If you want to go back in time, then snapshot.d.o already does what you want, no?

What is it that you want to do in the end?

I presume having no broken dependencies at all 'times' he wants to travel to. Makes sense to me. I guess the solution is to use the logic as used in the existing transitions from unstable to testing instead of those timestamps?

Thanks!

cheers, josch

--

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Sun, Sep 18, 2022 at 10:58:37AM +0200, Roland Clobus wrote:

All of these timestamps (for sid) are close to each other, but not
identical. I would guess that the earliest timestamp is the 'real'
timestamp, but it is accessible (on snapshot.d.o) only with a later timestamp.

Consider that the archive "freezes" when it starts working on an update.
Once it finishes its job it generates the Release files, and puts the
current timestamp *inside* the file. But then that file gets copied
around, signed, etc and that will change the timestamp.

Also, for example, I just spotted a line on IRC saying that this time
around copying the archive from the live one to archive.debian.org also
reset the mtimes...

So I really wouldn't trust mtimes in any way, only what's inside the
Release file.

What's in the trace file is IIRC the time when the archive kicks the
mirrors off, which also happens after the generation of the indexes, and
really has no business in this discussion as it's only a tool mirrors
use to coordinate and see if they are too much out of sync.
As you noticed snapshots indexes by time of the archive run, which is… honestly I don't particularly consider it a good idea myself but that's
how the design decision went I guess.
(does it make sense to archive twice if there were two mirror pushes for
the same identical set of index files?)

--
regards,
Mattia Rizzolo

GPG Key: 66AE 2B4A FCCF 3F52 DA18 4D18 4B04 3FCD B944 4540 .''`.
More about me: https://mapreri.org : :' : Launchpad user: https://launchpad.net/~mapreri `. `'`
Debian QA page: https://qa.debian.org/developer.php?login=mattia `-

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Quoting Roland Clobus (2022-09-21 22:03:33)

As to the origin of my question: The snapshot-mirror has been offline for a while, and I've used deb.debian.org to generate my test images (for the reproducible live-build-based live-ISO images). I've compared the timestamps of the InRelease file at deb.d.o with the timestamp in the URL available on snapshot.d.o and I've noticed a difference. That means that all images that I've generated using deb.d.o cannot be verified at any later moment than within the same dak-round (which last for 6 hours).

Why not? Just check which package versions your image contains and find the correct snapshot.debian.org timestamp(s) containing all these packages via metasnap.debian.net.
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