Function check_disk_space_inner

crates/lib/src/deploy.rs:430–450

Core disk space check: verify that `bytes_to_fetch` fits within available space, leaving at least `min_free` bytes reserved.

(
    fd: impl AsFd,
    bytes_to_fetch: u64,
    min_free: u64,
    imgref: &ImageReference,
)

/// Core disk space check: verify that `bytes_to_fetch` fits within available space,
/// leaving at least `min_free` bytes reserved.
fn check_disk_space_inner(
    fd: impl AsFd,
    bytes_to_fetch: u64,
    min_free: u64,
    imgref: &ImageReference,
) -> Result<()> {
    let stat = rustix::fs::fstatvfs(fd)?;
    let bytes_avail = stat.f_bsize.checked_mul(stat.f_bavail).unwrap_or(u64::MAX);
    let usable = bytes_avail.saturating_sub(min_free);
    tracing::trace!("bytes_avail: {bytes_avail} min_free: {min_free} usable: {usable}");

    if bytes_to_fetch > usable {
        anyhow::bail!(
            "Insufficient free space for {image} (available: {available} required: {required})",
            available = ostree_ext::glib::format_size(usable),
            required = ostree_ext::glib::format_size(bytes_to_fetch),
            image = imgref.image,
        );
    }
    Ok(())
}

/// Verify there is sufficient disk space to pull an image into the ostree repo.
/// Respects the repository's configured min-free-space threshold.