Use the #[sorted] macro on more conda json types

[wolfv]

For reproducibility reasons we want to ensure that fields are serialized in a deterministic (alphabetical) order.

To achieve this, we have a macro in rattler_macros that ensures that all struct fields are sorted alphabetically.

We need to apply this to more structs, such as

• IndexJson
• AboutJson
• possibly more

[travishathaway]

@wolfv, could you assign this to me. I have already started working on it.

If I understand it correctly, that "sorted" macro is basically just a code linter, right? At first I thought it might sort the fields for you, but it looks like all it does is raise a compilation error if you haven't sorted these fields yourself.

[wolfv]

Hi @travishathaway yes, exactly, it's a compile-time linter so to say :)

Unfortunately it doesn't work when renaming fields with the serde rename function so sometimes we have to take care "manually". I tried once to make it work but it was pretty hard.

It's also not strictly necessary that the fields are sorted, but I think it's good to encode the alphabetical ordering so that we know how to "reproducibly" create the JSON files in any language :)