They report homepage problems in more than a thousand of our packages...
EDIT: though I'm not sure if I'd count permanent redirects as problems.

Yep, interesting site. Well, maybe, if we ever have too much time on our hands, we might use the API to update all those homepages.

Any idea how https://nixos.org/nixpkgs/packages-unstable.json.gz is updated? Apparently that's what they're using to update but I see the current commit is very old: c5badb1.

@vcunat I asked the same on the IRC channel earlier but then thought of https://github.com/NixOS/nixos-channel-scripts/blob/master/generate-programs-index.cc

I can't see where in particular...

You're right, this is it.
https://github.com/NixOS/nixos-homepage/blob/master/Makefile#L211

Hmm, that nix-env command seems OK on latest nixpkgs-unstable (0f2db06).

Would be nice if we could make a cron job for this.

I'd think it is automatically updated already.

I checked some of the packages and they were quite old, and repology updates everyday (and had just finished updating). Note also that it uses in fact nixos-unstable.

This is the configuration https://github.com/NixOS/nixos-org-configurations/blob/b48e1e1438df7d1bd24f31aefdb991ad51769368/nixos-org/webserver.nix#L203

They update by downloading that file of ours – and that one's outdated for some reason, even though the homepage has updated in the meantime (e.g. the news is weeks newer).

@vcunat I opened #27237 for this discussion.