Function container_name_for_sandbox

crates/openshell-driver-docker/src/lib.rs:2958–2989

(sandbox: &DriverSandbox)

const CONTAINER_NAME_PREFIX: &str = "openshell-";

fn container_name_for_sandbox(sandbox: &DriverSandbox) -> String {
    let id_suffix = sanitize_docker_name(&sandbox.id);
    let name = sanitize_docker_name(&sandbox.name);
    if name.is_empty() {
        let mut base = format!("{CONTAINER_NAME_PREFIX}{id_suffix}");
        // The prefix is always < MAX_CONTAINER_NAME_LEN. Truncate the id
        // suffix only if the sandbox id itself is pathologically long.
        if base.len() > MAX_CONTAINER_NAME_LEN {
            base.truncate(MAX_CONTAINER_NAME_LEN);
        }
        return base;
    }

    // Reserve space for the prefix and the `-<id_suffix>` tail so the id
    // suffix — which is what makes the name unique between sandboxes that
    // share a human-readable prefix — is never truncated away.
    let reserved = CONTAINER_NAME_PREFIX.len() + 1 + id_suffix.len();
    if reserved >= MAX_CONTAINER_NAME_LEN {
        // Pathological sandbox id. Fall back to `<prefix><id>` and truncate.
        let mut base = format!("{CONTAINER_NAME_PREFIX}{id_suffix}");
        base.truncate(MAX_CONTAINER_NAME_LEN);
        return trim_container_name_tail(base);
    }

    let name_budget = MAX_CONTAINER_NAME_LEN - reserved;
    let truncated_name = if name.len() > name_budget {
        trim_container_name_tail(name[..name_budget].to_string())
    } else {
        name
    };
    format!("{CONTAINER_NAME_PREFIX}{truncated_name}-{id_suffix}")
}

/// Docker container names may not end with `-`, `.`, or `_`. Truncation can
/// leave one of those trailing, so strip them before returning.