Function cargo_update::ops::assert_index_path

pub fn assert_index_path(
    cargo_dir: &Path, 
    registry_url: &str
) -> Result<PathBuf, Cow<'static, str>>

Get the location of the registry index corresponding ot the given URL; if not present – make it and its parents.

As odd as it may be, this can happen (if rarely) and is a supported configuration.

Examples

let index = assert_index_path(&cargo_dir, "https://github.com/rust-lang/crates.io-index").unwrap();

// Use find_package_data() to look for packages