b0ba65a936
Previously, the Rust TUI was writing log files to `/tmp`, which is world-readable and not available on Windows, so that isn't great. This PR tries to clean things up by adding a function that provides the path to the "Codex config dir," e.g., `~/.codex` (though I suppose we could support `$CODEX_HOME` to override this?) and then defines other paths in terms of the result of `codex_dir()`. For example, `log_dir()` returns the folder where log files should be written which is defined in terms of `codex_dir()`. I updated the TUI to use this function. On UNIX, we even go so far as to `chmod 600` the log file by default, though as noted in a comment, it's a bit tedious to do the equivalent on Windows, so we just let that go for now. This also changes the default logging level to `info` for `codex_core` and `codex_tui` when `RUST_LOG` is not specified. I'm not really sure if we should use a more verbose default (it may be helpful when debugging user issues), though if so, we should probably also set up log rotation?
codex-rs
April 24, 2025
Today, Codex CLI is written in TypeScript and requires Node.js 22+ to run it. For a number of users, this runtime requirement inhibits adoption: they would be better served by a standalone executable. As maintainers, we want Codex to run efficiently in a wide range of environments with minimal overhead. We also want to take advantage of operating system-specific APIs to provide better sandboxing, where possible.
To that end, we are moving forward with a Rust implementation of Codex CLI contained in this folder, which has the following benefits:
- The CLI compiles to small, standalone, platform-specific binaries.
- Can make direct, native calls to seccomp and landlock in order to support sandboxing on Linux.
- No runtime garbage collection, resulting in lower memory consumption and better, more predictable performance.
Currently, the Rust implementation is materially behind the TypeScript implementation in functionality, so continue to use the TypeScript implmentation for the time being. We will publish native executables via GitHub Releases as soon as we feel the Rust version is usable.
Code Organization
This folder is the root of a Cargo workspace. It contains quite a bit of experimental code, but here are the key crates:
core/contains the business logic for Codex. Ultimately, we hope this to be a library crate that is generally useful for building other Rust/native applications that use Codex.interactive/CLI with a UX comparable to the TypeScript Codex CLI.exec/"headless" CLI for use in automation.tui/CLI that launches a fullscreen TUI built with Ratatui.repl/CLI that launches a lightweight REPL similar to the Python or Node.js REPL.cli/CLI multitool that provides the aforementioned CLIs via subcommands.