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Prefer releases.openai.com in standalone installers (#34910)

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## What changed

- Make the shell and PowerShell installers download release metadata and assets from `releases.openai.com` by default, with bounded request timeouts.
- Fall back to GitHub Releases when metadata is unusable, required assets are missing, or downloaded assets fail checksum or manifest validation.
- Document `CODEX_INSTALLER_USE_RELEASES_OPENAI_COM=false` for opting out of the default release source.

## Testing

- Cover default-source installation, malformed and incomplete metadata, version mismatches, corrupt assets, invalid checksums, incomplete manifests, and GitHub fallback failures in the shell installer tests.

GitOrigin-RevId: 1c65d527ca79761358c3a4cd7a5fd675e1ef75b2
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zsol-openai
2026-07-23 09:16:41 +00:00
committed by copyberry
parent 4462b9deef
commit 39a2438d16
4 changed files with 416 additions and 62 deletions
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@@ -25,6 +25,16 @@ Run the following on Windows to install Codex CLI:
powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"
```
The standalone installers download from `https://releases.openai.com/codex` by default and fall back to GitHub Releases if a metadata or asset download is unavailable. To force GitHub Releases, set `CODEX_INSTALLER_USE_RELEASES_OPENAI_COM` to `false` (`0` and `no` are also accepted):
```shell
curl -fsSL https://chatgpt.com/codex/install.sh | CODEX_INSTALLER_USE_RELEASES_OPENAI_COM=false sh
```
```powershell
$env:CODEX_INSTALLER_USE_RELEASES_OPENAI_COM='false'; irm https://chatgpt.com/codex/install.ps1 | iex
```
Codex CLI can also be installed via the following package managers:
```shell