bun-termux

This project provides a modified build of [Bun](https://bun.sh) that runs natively on Android/Termux (aarch64) using Bionic libc. No proot, no glibc-runner, no LD_PRELOAD, no termux-exec — all fixes are compiled directly into the binary via `#[cfg(target_os = "android")]` Rust branches. ### What it solves Upstream Bun 1.4's Android build hits three remaining issues on Termux: - `bun install` crashes with SIGSYS because Android's zygote seccomp profile traps `fchmodat2` and `openat2` instead of returning `ENOSYS`, preventing upstream runtime fallbacks from running. - `bunx <pkg>` fails with ENOENT because npm shims carry `#!/usr/bin/env node` shebangs and Android has no `/usr/bin`. - `bun:ffi cc()` reports TinyCC disabled because upstream gates the feature off on Android. This fork applies seven source-level patches against Bun v1.4.0 to fix each issue. ### Features - **Full FFI support**: `dlopen`, `cc()`, and `JSCallback` all work. - **TinyCC enabled on Android**: SELinux-safe JIT memory via `memfd_create` + ARM64 long-call veneers for out-of-range BL calls. - **Seccomp-trap bypass**: `lchmod` uses `fchmodat(AT_SYMLINK_NOFOLLOW)` instead of trapped `fchmodat2`; resolver walks use plain `openat` instead of trapped `openat2`. - **Shebang remap**: Scripts with missing interpreters remap paths like `/usr/bin` to `$PREFIX/bin`. - **`bunx` works**: Launcher sets `argv[0]` correctly for script spawning. ### Compatibility | Item | Status | |---|---| | Architecture | `aarch64` (arm64) | | Android | 10+ (API 29+, SELinux untrusted_app_27+) | | Bun version | 1.4.0 | | `bun install` | Works (seccomp bypass) | | `bun run` / `bunx` | Works | | `bun build --compile` | Works (fixed upstream) | | `bun:ffi` `dlopen` / `cc()` / `JSCallback` | Work | | opentui TUI | Works | ### Install ```bash curl -fsSL https://raw.githubusercontent.com/bd-loser/bun-termux/main/scripts/install.sh | bash ``` Installs `bun` and `bunx` into `$PREFIX/bin`. ### Build from source Requires Rust, NDK r27c, clang 18, CMake, Ninja, and Bun for bootstrapping. See [docs/BUILD.md](docs/BUILD.md) for full instructions. ### Licensing MIT for the fork patches; TinyCC components under LGPL-2.1; upstream Bun under MIT.