Function reg_index::metadata_from_crate

pub fn metadata_from_crate(
    index_url: &str, 
    crate_path: impl AsRef<Path>
) -> Result<IndexPackage, Error>

Get the metadata for a package before publishing it.

This will get the metadata directly from a .crate file. See metadata for a variant of this function that takes a path to a Cargo.toml manifest, and for more details on how this works.