Termux / Android arm64 Support

CodeWhale runs natively on Android arm64 via Termux. This document covers the install path and the platform-specific behavior differences you should know about.

Installation

See INSTALL.md → "Android / Termux arm64" for the current install steps. The short version:

# Inside Termux (pkg install rust git ...)
cargo install codewhale-cli --locked
cargo install codewhale-tui --locked

Or, when a release includes codewhale-android-arm64.tar.gz, extract it into $PREFIX/bin.

Do not install the GNU libc codewhale-linux-arm64 archive in Termux. Android uses Bionic libc, not glibc — the Linux binary will not run.

Platform behavior on Android

CodeWhale's security model has two independent layers:

OS filesystem sandbox — Seatbelt (macOS), Landlock (Linux), or nothing. This layer restricts what shell commands can access at the kernel level.
CodeWhale's own gates — workspace trust, approval prompts, allow_shell/disallowed-tools, and the file-tool permission system. These are application-level and work identically on every platform.

Sandbox: unavailable (type = none)

Android does not expose Landlock, Seatbelt, or any equivalent mandatory access control API that CodeWhale can use. On Android, codewhale doctor reports sandbox type: none.

get_platform_sandbox() returns None on Android.
No Linux-only sandbox modules (Landlock, bwrap) are compiled into the Android build — they are #[cfg(target_os = "linux")]-gated and Rust treats android as a distinct target from linux.
Shell commands run without OS-level filesystem containment. Rely on CodeWhale's approval gates and workspace trust for safety.

Approvals: still apply

CodeWhale's approval system (interactive prompts for risky actions, allow_shell, --disallowed-tools) is entirely application-level. It works identically on Android — the absence of an OS sandbox does not weaken it.

Secret storage: file-backed

Android has no OS keyring (no Secret Service / dbus). CodeWhale falls back to file-backed secret storage: plaintext JSON files under ~/.codewhale/secrets/ (Termux home directory), protected only by 0600 file permissions — they are not encrypted at rest. On single-user Termux this is the same protection level as ~/.ssh private keys.

API keys set via codewhale setup or /provider land in these permission-protected files; codewhale auth set additionally writes the configured key into config.toml, so treat both files as sensitive.
codewhale doctor reports which secret backend is active.

Self-update

codewhale update on Android requests codewhale-android-arm64 and codewhale-tui-android-arm64 release assets — never the Linux arm64 assets. The GNU libc (glibc) compatibility preflight is Linux-only and is skipped entirely on Android (Bionic libc).

Known limitations (first Termux release)

Feature	Status	Notes
OS sandbox	❌ unavailable	No Landlock/bwrap/Seatbelt on Android
OS keyring	❌ unavailable	Falls back to file-backed secrets
Approvals / gates	✅ full	Application-level, platform-independent
File tools	✅ full	Governed by workspace trust
Self-update	✅ full	Selects Android assets
Shell execution	⚠️ no containment	Runs without OS sandbox; rely on approvals

#4236 — Epic: official Termux / Android arm64 support
#4238 — Make Android sandbox and secret-store behavior explicit
#4240 — Build and bundle Android arm64 release assets
#4241 — Teach updater to select Android assets on Termux
#4242 — Run Termux runtime QA

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