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codex-termux

v0.1.4

Published

Install OpenAI Codex CLI natively on Termux (Android) — no proot, no containers. Official static-musl codex binaries with a local DNS proxy + TLS bridge.

Vulnerabilities

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Links

Git

Maintainers

rexrozerexroze

Keywords

termuxcodexopenaiandroidaicoding-agentstaticmuslnativeproot-free

Readme

Requirements

  • Termux from F-Droid (Play Store builds are outdated)
  • aarch64 (ARM64) device — the only architecture Codex ships a Linux build for
  • An internet connection for the ~85 MB download
  • nodejs (installed automatically if missing — needed for the DNS proxy)

Installation

One line — zero prerequisites:

curl -fsSL https://raw.githubusercontent.com/rexroze/codex-termux/main/install.sh | sh

Or via npm (needs nodejs first):

pkg install nodejs-lts
npm i -g codex-termux

[!TIP] codex is on your PATH immediately — the first run downloads the official static-musl binary (~85 MB), verifies its sha256 checksum, and configures your shell (bash, zsh, or fish).

Usage

codex login          # or: export OPENAI_API_KEY=...
codex

The launcher starts a tiny local DNS proxy on demand (Android has no /etc/resolv.conf, which would otherwise break codex's DNS lookups) and points codex at Termux's CA bundle for TLS.

Updating

Updates are manual by design — the update check on startup is disabled (check_for_update_on_startup = false in ~/.codex/config.toml), so new upstream releases don't get pulled automatically. When a new Codex version ships, re-run the installer:

sh install.sh        # or the curl one-liner again — always fetches latest

Pin a specific version with sh install.sh -v rust-v0.148.0. codex update is intentionally not the supported path (it fetches builds outside this verified install).

How it works

Codex ships as a fully static musl binary — it runs on Termux directly, no glibc bridge. Two Termux-specific problems are solved by the launcher:

  1. DNS: Android's /etc is /system/etc (read-only, no resolv.conf), so the static binary's DNS lookups fail. The launcher starts a local HTTP proxy (Node) that resolves hostnames through Android's own resolver and routes codex through it via HTTPS_PROXY.
  2. TLS: the static binary can't find Android's CA store, so the launcher sets SSL_CERT_FILE=$PREFIX/etc/tls/cert.pem.

A first-run ~/.codex/config.toml sets sandbox_mode = "danger-full-access" (codex's bubblewrap sandbox can't run on Android) and check_for_update_on_startup = false. Full technical deep dive: docs/HOW-IT-WORKS.md.

Links