Function dir_is_missing_or_empty

src/diagnostics/mod.rs:118–123

True when `path` does not exist, is not a directory, or contains no entries. Any read error is treated as "cold" so we err toward prewarming rather than blocking.

(path: &Path)

/// entries. Any read error is treated as "cold" so we err toward prewarming
/// rather than blocking.
fn dir_is_missing_or_empty(path: &Path) -> bool {
    match std::fs::read_dir(path) {
        Ok(mut entries) => entries.next().is_none(),
        Err(_) => true,
    }
}

/// Path to the private Rust diagnostics cargo target dir. Exposed so callers
/// can surface it in prewarm status messages.