GNU bug report logs - #37207
nginx serving files from the store returns Last-Modified = Epoch

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From: Gábor Boskovits <boskovits <at> gmail.com>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 37207 <at> debbugs.gnu.org, Tobias Geerinckx-Rice <me <at> tobias.gr>
Subject: bug#37207: guix.gnu.org Last Modified at epoch
Date: Thu, 29 Aug 2019 08:11:46 +0200

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Hello Ludo,

Ludovic Courtès <ludo <at> gnu.org> ezt írta (időpont: 2019. aug. 28., Sze,
22:32):

> Hello,
>
> Gábor Boskovits <boskovits <at> gmail.com> skribis:
>
> > we should create a file with the git last modification time of the files,
> > updated when there is a new commit in the repo => last-modified
> > we should create a file with some hash of the files, updated when there
> is
> > a new commit in the repo => etag
> > we could restrict these operations to the files modified since the last
> > checkout.
> >
> > Retrieve these with embededd perl.
> > Wdyt?
>
> What would the config look like?  AFAICS our ‘nginx’ package doesn’t
> embed Perl, and I think it’s better this way.  :-)  Can we do that with
> pure nginx directives?
>
> We create /srv/guix.gnu.org (as a symlink) with the correct mtime¹.  If
> we can tell nginx to use it as the ‘Last-Modified’ date, that’s perfect.
>
>
I was thinking about this. Yes, we can solve that with pure nginx. There is
an issue however.
It invalidates all cached entries on update, so files not modified will
also need to be downloaded again.

The easiest way to do that would be to simply generate an nginx config
snippet at a configurable location,
setting up the mtime and etags variable, and include that from the main
config.

If this would be ok, then I will have a look at implementing this.

Ludo’.
>
> ¹
> https://git.savannah.gnu.org/cgit/guix/maintenance.git/tree/hydra/berlin.scm#n212
>

Best regards,
g_bor

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