'cargo publish' to a private git repository?

I'm trying to use 'cargo publish' to a private registry which uses 'git' (I need to use the dependency a coming from a registry and not directly using the git url as otherwise I have other issues with specifying versions which I cannot do if I refer to the dependency using git url).
I've added a [registry.myregistry] section in .cargo/config.toml of my project, containing the 'index' property pointing to my git repository I plan to use as a registry.

Whenever I run 'cargo publish', I get the following issues:

cargo publish -vvvv -p my_package                                                                                                                                                                           
    Updating `myregistry` index
     Running `git fetch --verbose --force --update-head-ok 'https://...../myregistry.git' '+HEAD:refs/remotes/origin/HEAD'`
POST git-upload-pack (321 bytes)
From https://..../myregistry.git
 = [up to date]                 -> origin/HEAD
thread 'main' panicked at 'remote registries must have config', src/cargo/ops/registry/mod.rs:135:13

looks like I'm missing some registry configuration on my side but I can't find what it is.
Does anybody know what is the "remote registry config" cargo publish is complaining about?

Unfortunately you need more than a git repo to host a registry you can publish to (you need a server to host the .crate compressed files and must provide a web api as well). Here's a reference on how to run your own registry and what resources you must provide: Running a Registry - The Cargo Book. If that's too much work for you, you can use a service that hosts private registries for you, like cloudsmith for example.

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thanks!

Indeed, after some more tinkering it looks like the "missing config" message is not so much "client not having the config" but "registry not exposing its config". cargo is looking for a config.json file where api endpoint and other stuff is configured.

Kellnr is a free and open-source registry for Rust crates. It functions similarly to crates.io, but with the added benefit of being able to host it on your own hardware for private crates.

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Full list of alternative registries: Third party registries · rust-lang/cargo Wiki · GitHub

And I'd recommend ktra if you want all your data (index repo & source code of packages & accounts) to be self-hosted.

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