Function crates_index::local_path_and_canonical_url

pub fn local_path_and_canonical_url(
    url: &str,
    cargo_home: Option<&Path>
) -> Result<(PathBuf, String), Error>

Get the disk location of the specified url, as well as its canonical form, exactly as cargo would.

cargo_home is used to root the directory at specific location, if not specified CARGO_HOME or else the default cargo location is used as the root.