Linux distribution metadata, download, and verification.

This crate provides:

• Distribution registry with version and URL resolution
• Architecture detection
• HTTP download with progress callbacks and SHA256 verification
• LXC Images (Simplestreams) unified source for all distros
• Mirror selection (official, TUNA, USTC, custom R2)

Example

use distro::{Distro, Version, Arch, download_distro};

# async fn example() -> Result<(), distro::Error> {
let bytes = download_distro(
    Distro::Alpine,
    &Version::new("3.20"),
    Arch::current(),
    |downloaded, total| {
        eprintln!("{downloaded}/{total} bytes");
    },
).await?;
# Ok(())
# }