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## Why Fixes openai/codex#20944. Desktop side chats are intentionally ephemeral and pathless. They can still accept live turns while loaded, but after a reload there is no persisted rollout to resume. In the reported failure mode, Desktop could send `$CODEX_HOME` as the resume/fork path for one of these pathless side chats. `thread/resume` and `thread/fork` prefer an explicit `path` over `threadId`, and rollout path lookup only checked that a candidate existed. That let `$CODEX_HOME` pass as a rollout path, so the later rollout reader tried to open a directory and surfaced the low-level `Is a directory` error. ## What Changed - Reject explicit rollout paths that resolve to a directory or other non-file before attempting to read rollout history. - Make `codex_rollout::existing_rollout_path` return only plain or compressed rollout candidates that are actual files. - Add an app-server regression test that creates an ephemeral fork, runs a turn while the side thread is loaded, simulates reload, then verifies both `thread/resume` and `thread/fork` reject `$CODEX_HOME` with `path is a directory` instead of the OS-level directory-read error. - Rebase over the `TestAppServer` rename and update the remaining stale test harness call sites to use `TestAppServer` with `app_server` local variables. Relevant code: - `thread-store/src/local/read_thread.rs` validates explicit rollout paths before rollout reading:25b47c8f42/codex-rs/thread-store/src/local/read_thread.rs (L146-L165)- `rollout/src/compression.rs` now requires file metadata for plain and compressed rollout candidates:25b47c8f42/codex-rs/rollout/src/compression.rs (L940-L950)- The repro test covers the pathless ephemeral side-chat reload case:25b47c8f42/codex-rs/app-server/tests/suite/v2/thread_fork.rs (L774-L886)## Verification - `just test -p codex-app-server pathless_ephemeral_thread_rejects_codex_home_path_after_reload`
Codex CLI is a coding agent from OpenAI that runs locally on your computer.
If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run
codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Run the following on Mac or Linux to install Codex CLI:
curl -fsSL https://chatgpt.com/codex/install.sh | sh
Run the following on Windows to install Codex CLI:
powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"
Codex CLI can also be installed via the following package managers:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
You can also go to the latest GitHub Release and download the appropriate binary for your platform.
Each GitHub Release contains many executables, but in practice, you likely want one of these:
- macOS
- Apple Silicon/arm64:
codex-aarch64-apple-darwin.tar.gz - x86_64 (older Mac hardware):
codex-x86_64-apple-darwin.tar.gz
- Apple Silicon/arm64:
- Linux
- x86_64:
codex-x86_64-unknown-linux-musl.tar.gz - arm64:
codex-aarch64-unknown-linux-musl.tar.gz
- x86_64:
Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.
Using Codex with your ChatGPT plan
Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Business, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.
You can also use Codex with an API key, but this requires additional setup.
Docs
This repository is licensed under the Apache-2.0 License.