Cargo config in buildRustPackage

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1

Behind a TLS intercepting proxy, I am unable to build Nix packages using rustPlatform.buildRustPackage because cargo must be configured with the path to the SSL certificates. This config file is usually located in $HOME/.cargo/config, but since $HOME is intentionally useless in the build environment, this config file will not be found by cargo. How can I configure cargo in buildRustPackage, or make a config file available? I am not using HomeManager, and would ideally like to configure this system-wide on NixOS at least.

2

Technically, you can put config.toml in the same directory as the package and then pass it to cargo like so:

let
  configFile = ./config.toml;
in
buildRustPackage {
  cargoBuildFlags = [
    "--config"
    configFile
  ];
}

Don’t know how well this works, though.

Alternatively, it seems you can set this using the CARGO_HTTP_CAINFO env variable according to the - Environment Variables - The Cargo Book

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