bug#37207: guix.gnu.org Last Modified at epoch

[Gábor Boskovits]

Hello Tobias,

Tobias Geerinckx-Rice via Bug reports for GNU Guix <address@hidden> ezt írta (időpont: 2019. aug. 28., Sze, 16:38):

Gábor, Ludo',

Gábor Boskovits 写道：
> Supressing the last modified header is just an
> add_header Last-Modified "";
> away.

You'll also need:

# Don't honour client If-Modified-Since constraints.
if_modified_since off;
# Nginx's etags are hashes of file timestamp & file length.
etag off;

You really have a point here.

Based on my reseach, I came up with the following:

we need

etag off;

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?

 

Turning these off will of course prevent all caching.  I don't
know if that would add measurable load to guix.gnu.org (it would
be more problematic if we used a CDN, but it might still make a
difference).

Nix does something both interesting and icky — as always: patch[0]
nginx to look up the realpath() instead, so clients can still
cache using If-None-Match.

Kind regards,

T G-R

[0]: https://github.com/NixOS/nixpkgs/pull/48337

Best regards,

g_bor

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