tt-rss: update feed-icons handling

[fridtjof]

This was changed to go through the same cache system as everything else in 2022 [1]. Some clients still try to access the icons directly, so I've added a compatibility rewrite.

[1] https://community.tt-rss.org/t/favicons-cache-implementation-overhaul/5698

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[fridtjof]

This was originally missing the important half of the changes, apologies. Ready for review now

[gileri]

@NixOS/nixpkgs-merge-bot merge

[nixpkgs-merge-bot]

@gileri merge not permitted (#305350):
nixos/modules/services/web-apps/tt-rss.nix is not in pkgs/by-name/

[fridtjof]

Probably(?) caused by 7d30c40

I just rebased this, please try again :)

[gileri]

Hi @fridtjof, I had low expectations for it to accept merging. But now with the explanation, I'm sure it won't be merged, as this auto-merge is limited to packages, not modules. We'll have to wait for a maintainer.

[fridtjof]

Just bumped this and discovered an issue with the config as currently generated.

[fridtjof]

Ugh okay, I figured it out.

As of the current version of tt-rss used (0-unstable-2025-04-17), TTRSS_ICONS_DIR is still used, but exclusively for migrating old feed icons to the new directory.

As of May 22nd, this migration code is no longer there: https://gitlab.tt-rss.org/tt-rss/tt-rss/-/commit/25d86552149830235a7f3908fa17fdb9d0b0dc5f

I'll re-add the tmpfiles entry and add a comment as to why it's left in there.
However, I'm not familiar with how migrations like this are handled in relation to NixOS's release schedule, backporting practices and upgrade support.

Would this break for NixOS users if tt-rss was bumped up beyond May 22nd inbetween releases?

[fridtjof]

In light of TT-RSS's sunset [1] and learning about the maintainer's general attitude (to put it lightly) I am no longer interested in fixing this.

[1] https://community.tt-rss.org/t/the-end-of-tt-rss-org/7164/2