Function build_ca_path 

pub fn build_ca_path<'r, 'n>(
    name: &'n str,
    is_recursive: bool,
    hash: &NixHash,
    references: impl IntoIterator<Item = StorePathRef<'r>> + 'r,
    has_self_ref: bool,
) -> Result<StorePathRef<'n>, ParseStorePathError>

This builds a store path for a content-addressed path (used for fetches and FODs).