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install.sh

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#!/usr/bin/env sh

# rtk installer - https://github.com/rtk-ai/rtk

# Usage: curl -fsSL https://raw.githubusercontent.com/rtk-ai/rtk/refs/heads/master/install.sh | sh

set -e

REPO="rtk-ai/rtk"

BINARY_NAME="rtk"

# RTK_EDITION=oss installs the Apache-2.0 edition: the same `rtk` binary built

# without the BUSL-1.1 engine. Only the asset name changes -- the installed

# binary is always `rtk`, so hook commands already in an agent's settings keep

# working across editions.

if [ "${RTK_EDITION:-}" = "oss" ]; then

ASSET_PREFIX="rtk-oss"

else

ASSET_PREFIX="rtk"

fi

INSTALL_DIR="${RTK_INSTALL_DIR:-$HOME/.local/bin}"

# Colors

RED='\033[0;31m'

GREEN='\033[0;32m'

YELLOW='\033[1;33m'

NC='\033[0m' # No Color

info() {

printf "${GREEN}[INFO]${NC} %s\n" "$1"

}

warn() {

printf "${YELLOW}[WARN]${NC} %s\n" "$1"

}

error() {

printf "${RED}[ERROR]${NC} %s\n" "$1"

exit 1

}

# Detect OS

detect_os() {

case "$(uname -s)" in

Linux*) OS="linux";;

Darwin*) OS="darwin";;

*) error "Unsupported operating system: $(uname -s)";;

esac

}

# Detect architecture

detect_arch() {

case "$(uname -m)" in

x86_64|amd64) ARCH="x86_64";;

arm64|aarch64) ARCH="aarch64";;

*) error "Unsupported architecture: $(uname -m)";;

esac

}

# Get latest release version

# Primary: parse the 302 redirect on /releases/latest (no API call, no rate limit).

# Fallback: the GitHub REST API (subject to 60 req/hour anonymous limit).

get_latest_version() {

# Try the web redirect first — does not count against the API rate limit.

VERSION=$(curl -sI "https://github.com/${REPO}/releases/latest" \

| grep -i '^location:' \

| sed -E 's|.*/tag/([^[:space:]]+).*|\1|' \

| tr -d '\r')

# Fallback to the REST API if the redirect didn't yield a tag.

if [ -z "$VERSION" ]; then

warn "Redirect lookup failed, falling back to GitHub API..."

VERSION=$(curl -fsSL "https://api.github.com/repos/${REPO}/releases/latest" \

| grep '"tag_name":' \

| sed -E 's/.*"([^"]+)".*/\1/')

fi

if [ -z "$VERSION" ]; then

error "Failed to get latest version (GitHub API may be rate-limited; set RTK_VERSION=vX.Y.Z to pin)"

fi

}

# Build target triple

get_target() {

case "$OS" in

linux)

case "$ARCH" in

x86_64) TARGET="x86_64-unknown-linux-musl";;

aarch64) TARGET="aarch64-unknown-linux-gnu";;

esac

;;

darwin)

TARGET="${ARCH}-apple-darwin"

;;

esac

}

# Download and install

install() {

info "Detected: $OS $ARCH"

info "Target: $TARGET"

info "Version: $VERSION"

DOWNLOAD_URL="https://github.com/${REPO}/releases/download/${VERSION}/${ASSET_PREFIX}-${TARGET}.tar.gz"

CHECKSUMS_URL="https://github.com/${REPO}/releases/download/${VERSION}/checksums.txt"

TEMP_DIR=$(mktemp -d)

ARCHIVE="${TEMP_DIR}/${BINARY_NAME}.tar.gz"

CHECKSUMS="${TEMP_DIR}/checksums.txt"

ASSET_NAME="${ASSET_PREFIX}-${TARGET}.tar.gz"

info "Downloading from: $DOWNLOAD_URL"

if ! curl -fsSL "$DOWNLOAD_URL" -o "$ARCHIVE"; then

error "Failed to download binary"

fi

info "Downloading checksums..."

if ! curl -fsSL "$CHECKSUMS_URL" -o "$CHECKSUMS"; then

error "Failed to download checksums.txt — refusing to install unverified binary (set RTK_SKIP_CHECKSUM=1 to bypass at your own risk)"

fi

if [ "${RTK_SKIP_CHECKSUM:-0}" = "1" ]; then

warn "RTK_SKIP_CHECKSUM=1 set — SKIPPING checksum verification (NOT RECOMMENDED)"

else

info "Verifying SHA-256 checksum..."

EXPECTED=$(grep "[[:space:]]${ASSET_NAME}\$" "$CHECKSUMS" | awk '{print $1}')

if [ -z "$EXPECTED" ]; then

error "checksum for ${ASSET_NAME} not found in checksums.txt — refusing to install"

fi

# sha256sum (Linux GNU) vs shasum -a 256 (macOS) — prefer whichever is available.

if command -v sha256sum >/dev/null 2>&1; then

ACTUAL=$(sha256sum "$ARCHIVE" | awk '{print $1}')

elif command -v shasum >/dev/null 2>&1; then

ACTUAL=$(shasum -a 256 "$ARCHIVE" | awk '{print $1}')

else

error "Neither sha256sum nor shasum available — cannot verify checksum"

fi

if [ "$EXPECTED" != "$ACTUAL" ]; then

error "checksum mismatch! expected=${EXPECTED} actual=${ACTUAL} — refusing to install"

fi

info "Checksum verified."

fi

# Verify archive contents before extraction (CWE-22 path traversal).

# Reject any entry with an absolute path or a ".." component.

info "Verifying archive contents..."

if tar -tzf "$ARCHIVE" | grep -qE '^/|(^|/)\.\.(/|$)'; then

error "Archive contains unsafe paths (absolute or directory traversal) — refusing to extract"

fi

info "Extracting..."

tar -xzf "$ARCHIVE" -C "$TEMP_DIR"

mkdir -p "$INSTALL_DIR"

mv "${TEMP_DIR}/${BINARY_NAME}" "${INSTALL_DIR}/"

chmod +x "${INSTALL_DIR}/${BINARY_NAME}"

# Cleanup

rm -rf "$TEMP_DIR"

info "Successfully installed ${BINARY_NAME} to ${INSTALL_DIR}/${BINARY_NAME}"

}

# Verify installation

verify() {

INSTALLED_BIN="${INSTALL_DIR}/${BINARY_NAME}"

if [ -x "$INSTALLED_BIN" ]; then

info "Verification: $("$INSTALLED_BIN" --version)"

else

error "Binary not found at expected location: $INSTALLED_BIN"

fi

if ! command -v "$BINARY_NAME" >/dev/null 2>&1; then

warn "Binary installed but not in PATH. Add to your shell profile:"

warn " export PATH=\"\$HOME/.local/bin:\$PATH\""

fi

}

main() {

info "Installing $ASSET_PREFIX..."

detect_os

detect_arch

get_target

if [ -n "$RTK_VERSION" ]; then

VERSION="$RTK_VERSION"

info "Using pinned version from RTK_VERSION: $VERSION"

else

get_latest_version

fi

install

verify

echo ""

info "Installation complete! Run '$BINARY_NAME --help' to get started."

}

main