Function find_kernel_dir

crates/ostree-ext/src/bootabletree.rs:19–45

Find the kernel modules directory in a bootable OSTree commit. The target directory will have a `vmlinuz` file representing the kernel binary.

(
    root: &gio::File,
    cancellable: Option<&gio::Cancellable>,
)

/// Find the kernel modules directory in a bootable OSTree commit.
/// The target directory will have a `vmlinuz` file representing the kernel binary.
pub fn find_kernel_dir(
    root: &gio::File,
    cancellable: Option<&gio::Cancellable>,
) -> Result<Option<gio::File>> {
    let moddir = root.resolve_relative_path(MODULES);
    let e = moddir.enumerate_children(
        "standard::name",
        gio::FileQueryInfoFlags::NOFOLLOW_SYMLINKS,
        cancellable,
    )?;
    let mut r = None;
    for child in e.clone() {
        let child = &child?;
        if child.file_type() != gio::FileType::Directory {
            continue;
        }
        let childpath = e.child(child);
        let vmlinuz = childpath.child(VMLINUZ);
        if !vmlinuz.query_exists(cancellable) {
            continue;
        }
        if r.replace(childpath).is_some() {
            anyhow::bail!("Found multiple subdirectories in {}", MODULES);
        }
    }
    Ok(r)
}

fn read_dir_optional(
    d: &Dir,