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## Why PR CI should test the exact commit that was pushed to the PR branch. By default, GitHub's `pull_request` event checks out a synthetic merge commit from `refs/pull/<number>/merge`, so the tested tree can include an implicit merge with the current base branch instead of matching the pushed head SHA. Using the PR head SHA makes each check result correspond to a concrete commit the author submitted. This also behaves better for stacked PR workflows, including Sapling stacks and other Git stack tooling: a middle PR's head commit already contains the lower stack changes in its tree, without pulling in commits above it or GitHub's temporary merge ref. ## What Changed - Set every `actions/checkout` in `pull_request` workflows under `.github/workflows` to use `github.event.pull_request.head.sha` on PR events and `github.sha` otherwise. - Updated `blob-size-policy` to compare `github.event.pull_request.base.sha` and `github.event.pull_request.head.sha`, since it no longer checks out GitHub's merge commit where `HEAD^1`/`HEAD^2` represented the PR range. ## Verification - Parsed the edited workflow YAML files with Ruby. - Checked that every checkout block in the `pull_request` workflows has the PR-head `ref`.
npm i -g @openai/codex
or brew install --cask codex
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
Install globally with your preferred package manager:
# 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.