tailscale/tool/bun

#!/usr/bin/env bash
# Run a command with our local bun install, rather than any globally installed
# instance.

set -euo pipefail

if [[ "${CI:-}" == "true" ]]; then
    set -x
fi

(
    if [[ "${CI:-}" == "true" ]]; then
        set -x
    fi

    repo_root="${BASH_SOURCE%/*}/../"
    cd "$repo_root"

    cachedir="$HOME/.cache/tailscale-bun"
    zipfile="${cachedir}.zip"

    read -r want_rev < "./tool/bun.rev"

    got_rev=""
    if [[ -x "${cachedir}/bun" ]]; then
        got_rev=$("${cachedir}/bun" --version)
    fi

    if [[ "$want_rev" != "$got_rev" ]]; then
        # Detect platform
        os=$(uname -s | tr '[:upper:]' '[:lower:]')
        arch=$(uname -m)
        
        # Map architecture names to bun's naming convention
        case "$arch" in
            x86_64)
                arch="x64"
                ;;
            aarch64|arm64)
                arch="aarch64"
                ;;
            *)
                echo "Unsupported architecture: $arch" >&2
                exit 1
                ;;
        esac
        
        # Map OS names to bun's naming convention
        case "$os" in
            linux)
                platform="linux-${arch}"
                ;;
            darwin)
                platform="darwin-${arch}"
                ;;
            *)
                echo "Unsupported OS: $os" >&2
                exit 1
                ;;
        esac
        
        rm -rf "$cachedir" "$zipfile"
        mkdir -p "$cachedir"
        curl -f -L -o "$zipfile" "https://github.com/oven-sh/bun/releases/download/bun-v${want_rev}/bun-${platform}.zip"
        unzip -q "$zipfile" -d "$cachedir"
        mv "${cachedir}/bun-${platform}"/* "${cachedir}/"
        rmdir "${cachedir}/bun-${platform}"
        rm -f "$zipfile"
    fi
)

# Deliberately not using cachedir here, to keep the environment
# completely pristine for execution of bun.
export PATH="$HOME/.cache/tailscale-bun:$PATH"
exec "$HOME/.cache/tailscale-bun/bun" "$@"