set -e

echo "Installing GitHub Copilot CLI..."

OS="$(uname -s || echo "")"

case "$OS" in

Darwin*) PLATFORM="darwin" ;;

Linux*) PLATFORM="linux" ;;

CYGWIN*|MINGW*|MSYS*)

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

echo "Windows detected. Installing via winget..."

winget install GitHub.Copilot

exit $?

else

echo "Error: Windows detected but winget not found. Please see https://gh.io/install-copilot-readme" >&2

exit 1

fi

;;

*) echo "Error: Unsupported operating system $OS" >&2 ; exit 1 ;;

case "$(uname -m)" in

x86_64|amd64) ARCH="x64" ;;

aarch64|arm64) ARCH="arm64" ;;

*) echo "Error: Unsupported architecture $(uname -m)" >&2 ; exit 1 ;;

CURL_AUTH=()

WGET_AUTH=()

GIT_REMOTE="https://github.com/github/copilot-cli"

if [ -n "$GITHUB_TOKEN" ]; then

CURL_AUTH=(-H "Authorization: token $GITHUB_TOKEN")

WGET_AUTH=(--header="Authorization: token $GITHUB_TOKEN")

GIT_REMOTE="https://x-access-token:${GITHUB_TOKEN}@github.com/github/copilot-cli"

if [ "${VERSION}" = "latest" ] || [ -z "$VERSION" ]; then

DOWNLOAD_URL="https://github.com/github/copilot-cli/releases/latest/download/copilot-${PLATFORM}-${ARCH}.tar.gz"

CHECKSUMS_URL="https://github.com/github/copilot-cli/releases/latest/download/SHA256SUMS.txt"

elif [ "${VERSION}" = "prerelease" ]; then

# Get the latest prerelease tag

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

echo "Error: git is required to install prerelease versions" >&2

exit 1

fi

VERSION="$(git ls-remote --tags --sort "version:refname" "$GIT_REMOTE" | tail -1 | awk -F/ '{print $NF}')"

if [ -z "$VERSION" ]; then

echo "Error: Could not determine prerelease version" >&2

exit 1

fi

echo "Latest prerelease version: $VERSION"

DOWNLOAD_URL="https://github.com/github/copilot-cli/releases/download/${VERSION}/copilot-${PLATFORM}-${ARCH}.tar.gz"

CHECKSUMS_URL="https://github.com/github/copilot-cli/releases/download/${VERSION}/SHA256SUMS.txt"

# Prefix version with 'v' if not already present

case "$VERSION" in

v*) ;;

*) VERSION="v$VERSION" ;;

esac

DOWNLOAD_URL="https://github.com/github/copilot-cli/releases/download/${VERSION}/copilot-${PLATFORM}-${ARCH}.tar.gz"

CHECKSUMS_URL="https://github.com/github/copilot-cli/releases/download/${VERSION}/SHA256SUMS.txt"

echo "Downloading from: $DOWNLOAD_URL"

TMP_DIR="$(mktemp -d)"

trap 'rm -rf -- "$TMP_DIR"' EXIT

TMP_TARBALL="$TMP_DIR/copilot-${PLATFORM}-${ARCH}.tar.gz"

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

curl -fsSL "${CURL_AUTH[@]}" "$DOWNLOAD_URL" -o "$TMP_TARBALL"

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

wget -qO "$TMP_TARBALL" "${WGET_AUTH[@]}" "$DOWNLOAD_URL"

echo "Error: Neither curl nor wget found. Please install one of them."

exit 1

TMP_CHECKSUMS="$TMP_DIR/SHA256SUMS.txt"

CHECKSUMS_AVAILABLE=false

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

curl -fsSL "${CURL_AUTH[@]}" "$CHECKSUMS_URL" -o "$TMP_CHECKSUMS" 2>/dev/null && CHECKSUMS_AVAILABLE=true

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

wget -qO "$TMP_CHECKSUMS" "${WGET_AUTH[@]}" "$CHECKSUMS_URL" 2>/dev/null && CHECKSUMS_AVAILABLE=true

if [ "$CHECKSUMS_AVAILABLE" = true ]; then

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

if (cd "$TMP_DIR" && sha256sum -c --ignore-missing SHA256SUMS.txt >/dev/null 2>&1); then

echo "✓ Checksum validated"

else

echo "Error: Checksum validation failed." >&2

exit 1

fi

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

if (cd "$TMP_DIR" && shasum -a 256 -c --ignore-missing SHA256SUMS.txt >/dev/null 2>&1); then

echo "✓ Checksum validated"

else

echo "Error: Checksum validation failed." >&2

exit 1

fi

else

echo "Warning: No sha256sum or shasum found, skipping checksum validation."

fi

if ! tar -tzf "$TMP_TARBALL" >/dev/null 2>&1; then

echo "Error: Downloaded file is not a valid tarball or is corrupted." >&2

exit 1

if [ "$(id -u 2>/dev/null || echo 1)" -eq 0 ]; then

PREFIX="${PREFIX:-/usr/local}"

PREFIX="${PREFIX:-$HOME/.local}"

INSTALL_DIR="$PREFIX/bin"

if ! mkdir -p "$INSTALL_DIR"; then

echo "Error: Could not create directory $INSTALL_DIR. You may not have write permissions." >&2

echo "Try running this script with sudo or set PREFIX to a directory you own (e.g., export PREFIX=\$HOME/.local)." >&2

exit 1

if [ -f "$INSTALL_DIR/copilot" ]; then

echo "Notice: Replacing copilot binary found at $INSTALL_DIR/copilot."

tar -xz -C "$INSTALL_DIR" -f "$TMP_TARBALL"

chmod +x "$INSTALL_DIR/copilot"

echo "✓ GitHub Copilot CLI installed to $INSTALL_DIR/copilot"

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

echo ""

echo "Notice: $INSTALL_DIR is not in your PATH"

# Detect shell profile file for PATH

CURRENT_SHELL="$(basename "${SHELL:-/bin/sh}")"

case "$CURRENT_SHELL" in

zsh) RC_FILE="${ZDOTDIR:-$HOME}/.zprofile" ;;

bash)

if [ -f "$HOME/.bash_profile" ]; then

RC_FILE="$HOME/.bash_profile"

elif [ -f "$HOME/.bash_login" ]; then

RC_FILE="$HOME/.bash_login"

else

RC_FILE="$HOME/.profile"

fi

;;

fish) RC_FILE="${XDG_CONFIG_HOME:-$HOME/.config}/fish/conf.d/copilot.fish" ;;

*) RC_FILE="$HOME/.profile" ;;

esac

PATH_LINE="export PATH=\"$INSTALL_DIR:\$PATH\""

if [ "$CURRENT_SHELL" = "fish" ]; then

PATH_LINE="fish_add_path \"$INSTALL_DIR\""

fi

# Prompt user to add to shell rc file (only if interactive)

if [ -t 0 ] || [ -e /dev/tty ]; then

echo ""

printf "Would you like to add it to %s? [y/N] " "$RC_FILE"

if read -r REPLY </dev/tty 2>/dev/null; then

if [ "$REPLY" = "y" ] || [ "$REPLY" = "Y" ]; then

mkdir -p "$(dirname "$RC_FILE")"

echo "$PATH_LINE" >> "$RC_FILE"

echo "✓ Added PATH configuration to $RC_FILE"

echo " Restart your shell or run: source $RC_FILE"

fi

fi

else

echo ""

echo "To add $INSTALL_DIR to your PATH permanently, add this to $RC_FILE:"

echo " $PATH_LINE"

fi

echo ""

echo "Installation complete! To get started, run:"

echo " $PATH_LINE && copilot help"

echo ""

echo "Installation complete! Run 'copilot help' to get started."