Function mount_dlc_disk

perro_source/io_stack/perro_io/src/asset_io.rs:127–149

(name: &str, root: impl AsRef<Path>)

        .expect("required value must be present")
        .root
        .as_deref()
        .cloned()
        .expect("Project root not set")
}

/// Parse and atomically install a project root and its archive backing.
pub fn try_set_project_root(root: ProjectRoot) -> io::Result<()> {
    let archive = match &root {
        ProjectRoot::PerroAssets { data, .. } => {
            Some(Arc::new(PerroAssetsArchive::open_from_bytes(data)?))
        }
        ProjectRoot::Disk { .. } => None,
    };
    // One stat here replaces one per `res://` resolve.
    let has_res_dir = match &root {
        ProjectRoot::Disk { root, .. } => root.join("res").is_dir(),
        ProjectRoot::PerroAssets { .. } => false,
    };

    let mut state = PROJECT_ASSET_STATE
        .write()
        .expect("required value must be present");
    state.root = Some(Arc::new(root));
    state.root_has_res_dir = has_res_dir;
    state.archive = archive;
    Ok(())