Function librapidarchive::fs::unix::get_unix_group

pub fn get_unix_group(
    metadata: &Metadata, 
    _path: &Path
) -> Result<(u32, String)>

Determine the UNIX group ID and name for a given file.

Platform considerations

This is the Unix version of the function. It reports the correct GID for the file.

TODO: It should also report a group name, too...