Feature request: Disallow downgrades

[eclairevoyant]

Upstreams sometimes release tags out of order, for example if there's a stable and LTS version branches that are both getting maintenance. In such cases, running nix-update may downgrade stable to the LTS if the LTS tag is newer. It would be useful to disallow such downgrades in that scenario, and ensure only monotonically increasing version numbers.

Example: NixOS/nixpkgs#334315

[Mic92]

I wonder if this only came up after we switched to the releases api?

[eclairevoyant]

I wouldn't exactly say that, the following also results in a downgrade:

nix run github:mic92/nix-update/1.4.0 -- -vr 'v([0-9.]*)$' meilisearch

[adamcstephens]

Here's an example of a downgrade: NixOS/nixpkgs#339887

and from a manual run of nix-update

fetch https://git.sr.ht/~zethra/stargazer/refs/rss.xml
Update 1.2.1 -> 1.1.3 in /home/adam/git/nixpkgs/pkgs/servers/gemini/stargazer/default.nix

Is this a feature request or a bug? Is it expected behavior to downgrade in this situation?

[SuperSandro2000]

I think for sourcehut we need to semver sort the releases

[Mic92]

Archlinux has something that works also for more than just semver: https://man.archlinux.org/man/vercmp.8