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

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Message #32 received at 37207 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Gábor Boskovits <boskovits <at> gmail.com>
Cc: 37207 <at> debbugs.gnu.org, Tobias Geerinckx-Rice <me <at> tobias.gr>
Subject: Re: bug#37207: guix.gnu.org Last Modified at epoch
Date: Thu, 29 Aug 2019 14:40:12 +0200

Hi Gábor,

Gábor Boskovits <boskovits <at> gmail.com> skribis:

> 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.

I’m not sure I fully understand, but yes, if you could send a prototype
as a diff against maintenance.git, that’d be great!

Thank you,
Ludo’.

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