Function parse_image_ref

vmm/src/app/registry.rs:369–398

Parse "registry.example.com/repo/name" into ("registry.example.com", "repo/name"). For Docker Hub short names like "dstacktee/guest-image" (no dots in the first component), automatically expands to "registry-1.docker.io/dstacktee/guest-image".

(image_ref: &str)

/// For Docker Hub short names like "dstacktee/guest-image" (no dots in the
/// first component), automatically expands to "registry-1.docker.io/dstacktee/guest-image".
fn parse_image_ref(image_ref: &str) -> Result<(String, String)> {
    let trimmed = image_ref
        .trim_start_matches("https://")
        .trim_start_matches("http://");

    let first_slash = trimmed
        .find('/')
        .context("invalid image reference: no repository path")?;

    let first_component = &trimmed[..first_slash];
    let repo = &trimmed[first_slash + 1..];

    if repo.is_empty() {
        bail!("invalid image reference: empty repository");
    }

    // Docker Hub short names don't contain dots or colons
    let registry = if first_component.contains('.') || first_component.contains(':') {
        first_component.to_string()
    } else {
        // Docker Hub: "user/repo" → "registry-1.docker.io"
        // and the repo needs "library/" prefix for official images
        return Ok((
            "registry-1.docker.io".to_string(),
            format!("{first_component}/{repo}"),
        ));
    };

    Ok((registry, repo.to_string()))
}

// ─── OCI types ──────────────────────────────────────────────────────────────