Function create_image_prep_disk

crates/openshell-driver-vm/src/driver.rs:4777–4801

(
    image_path: &Path,
    size_bytes: u64,
    payload: &GuestImagePayload,
)

}

fn create_image_prep_disk(
    image_path: &Path,
    size_bytes: u64,
    payload: &GuestImagePayload,
) -> Result<(), String> {
    let staging_dir = overlay_staging_dir(image_path);
    if staging_dir.exists() {
        fs::remove_dir_all(&staging_dir)
            .map_err(|err| format!("remove stale image-prep staging dir: {err}"))?;
    }

    let result = (|| {
        fs::create_dir_all(staging_dir.join("upper").join("srv"))
            .map_err(|err| format!("create image-prep env dir: {err}"))?;
        fs::create_dir_all(staging_dir.join("work"))
            .map_err(|err| format!("create image-prep work dir: {err}"))?;
        fs::create_dir_all(staging_dir.join("config"))
            .map_err(|err| format!("create image-prep config dir: {err}"))?;
        stage_guest_image_payload(&staging_dir, payload)?;
        create_ext4_image_from_dir_with_size(&staging_dir, image_path, size_bytes)
    })();

    let _ = fs::remove_dir_all(&staging_dir);
    result
}

fn stage_guest_image_payload(
    staging_dir: &Path,