openai/codex · error · anyhow::Error

empty session file: {}

Error message

empty session file: {}

What it means

Error "empty session file: {}" thrown in openai/codex.

Source

Thrown at codex-rs/rollout/src/metadata.rs:118

/// Normal rollouts use `rollout-<timestamp>-<thread-id>.jsonl`, where the thread ID and rollout ID
/// are the same. Threads that have been `reverted` use
/// `rollout-<timestamp>-<thread-id>_<rollout-id>.jsonl`, where this returns the ID after `_`.
///
/// This can differ from [`SessionMeta::id`] when `thread/revert` keeps the thread ID stable while
/// switching to a new immutable rollout file.
pub fn rollout_id_from_path(rollout_path: &Path) -> Option<RolloutId> {
    let file_name = rollout_path.file_name()?.to_str()?;
    Some(RolloutFileName::parse(file_name)?.rollout_id())
}

pub async fn extract_metadata_from_rollout(
    rollout_path: &Path,
    default_provider: &str,
) -> anyhow::Result<ExtractionOutcome> {
    let (items, _thread_id, parse_errors) =
        RolloutRecorder::load_rollout_items(rollout_path).await?;
    if items.is_empty() {
        return Err(anyhow::anyhow!(
            "empty session file: {}",
            rollout_path.display()
        ));
    }
    let builder = builder_from_items(items.as_slice(), rollout_path).ok_or_else(|| {
        anyhow::anyhow!(
            "rollout missing metadata builder: {}",
            rollout_path.display()
        )
    })?;
    let mut metadata = builder.build(default_provider);
    for item in &items {
        apply_rollout_item(&mut metadata, item, default_provider);
    }
    if let Some(updated_at) = file_modified_time_utc(rollout_path).await {
        metadata.updated_at = updated_at;
        metadata.recency_at = updated_at;
    }

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/rollout/src/metadata.rs:118 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/6aa6abaf7e0e7f74. Report an issue: GitHub.