Function read_dir_optional

crates/ostree-ext/src/bootabletree.rs:47–56

(
    d: &Dir,
    p: impl AsRef<Path>,
)

}

fn read_dir_optional(
    d: &Dir,
    p: impl AsRef<Path>,
) -> std::io::Result<Option<cap_std::fs::ReadDir>> {
    match d.read_dir(p.as_ref()) {
        Ok(r) => Ok(Some(r)),
        Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(None),
        Err(e) => Err(e),
    }
}

/// Find the kernel modules directory in checked out directory tree.
/// The target directory will have a `vmlinuz` file representing the kernel binary.