install.sh

#!/bin/sh
set -e

# Greywall Installer
# Usage:
#   curl -fsSL https://raw.githubusercontent.com/greyhavenhq/greywall/main/install.sh | sh
#   curl -fsSL https://raw.githubusercontent.com/greyhavenhq/greywall/main/install.sh | sh -s -- v0.1.0

REPO="greyhavenhq/greywall"
BINARY="greywall"

OS=$(uname -s)
ARCH=$(uname -m)

case "$OS" in
  Linux)  ;;
  Darwin) ;;
  *)      echo "Unsupported OS: $OS"; exit 1 ;;
esac

case "$ARCH" in
  x86_64|amd64) ARCH="x86_64" ;;
  aarch64|arm64) ARCH="arm64" ;;
  *)             echo "Unsupported architecture: $ARCH"; exit 1 ;;
esac

# Version: first arg > env var > latest GitHub release
VERSION="${1:-${GREYWALL_VERSION:-}}"
if [ -z "$VERSION" ]; then
  VERSION=$(curl -fsSL "https://api.github.com/repos/$REPO/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
fi
case "$VERSION" in v*) ;; *) VERSION="v$VERSION" ;; esac
VERSION_NUM="${VERSION#v}"

if [ -z "$VERSION_NUM" ]; then
  echo "Error: could not determine version"; exit 1
fi

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

# Archive name matches GoReleaser: greywall_0.1.0_Linux_x86_64.tar.gz
URL="https://github.com/$REPO/releases/download/${VERSION}/${BINARY}_${VERSION_NUM}_${OS}_${ARCH}.tar.gz"
CHECKSUM_URL="https://github.com/$REPO/releases/download/${VERSION}/checksums.txt"

# Show what we're about to do
echo ""
echo "Greywall Installer"
echo "-------------------"
echo ""
echo "Version:       $VERSION_NUM"
echo "Platform:      ${OS} ${ARCH}"
echo "Install to:    $INSTALL_DIR"
echo "Release notes: https://github.com/$REPO/releases/tag/$VERSION"

# Check for existing installation
UPGRADE=""
if [ -x "$INSTALL_DIR/$BINARY" ]; then
  CURRENT=$("$INSTALL_DIR/$BINARY" -v 2>/dev/null | awk '{print $2}' || echo "unknown")
  echo "Current:       $CURRENT"
  UPGRADE=1
fi

echo ""
if [ -n "$UPGRADE" ]; then
  echo "Ready to update the existing installation. This will:"
else
  echo "Ready to install greywall. This will:"
fi
echo "  1. Download greywall $VERSION from GitHub"
echo "  2. Verify the download checksum"
echo "  3. Install the binary to $INSTALL_DIR"
echo ""

printf "Proceed? [Y/n] "
read -r REPLY </dev/tty
case "$REPLY" in
  [nN]*) echo "Aborted."; exit 0 ;;
  *)     ;;
esac

echo ""

TMP=$(mktemp -d)
trap 'rm -rf "$TMP"' EXIT

echo "Downloading greywall $VERSION..."
curl -fsSL -o "$TMP/archive.tar.gz" "$URL"

# Verify checksum
if command -v sha256sum >/dev/null 2>&1; then
  SHA_CMD="sha256sum"
elif command -v shasum >/dev/null 2>&1; then
  SHA_CMD="shasum -a 256"
else
  SHA_CMD=""
fi

if [ -n "$SHA_CMD" ]; then
  curl -fsSL -o "$TMP/checksums.txt" "$CHECKSUM_URL"
  EXPECTED=$(grep "${BINARY}_${VERSION_NUM}_${OS}_${ARCH}.tar.gz" "$TMP/checksums.txt" | awk '{print $1}')
  ACTUAL=$($SHA_CMD "$TMP/archive.tar.gz" | awk '{print $1}')
  if [ "$EXPECTED" != "$ACTUAL" ]; then
    echo "Error: checksum mismatch"; exit 1
  fi
  echo "Checksum verified."
fi

tar -xzf "$TMP/archive.tar.gz" -C "$TMP"

mkdir -p "$INSTALL_DIR"

mv "$TMP/$BINARY" "$INSTALL_DIR/"
chmod +x "$INSTALL_DIR/$BINARY"

echo "Installed greywall $VERSION to $INSTALL_DIR"

# Always install/update greyproxy
echo ""
"$INSTALL_DIR/$BINARY" setup

case ":$PATH:" in
  *":$INSTALL_DIR:"*) ;;
  *)
    echo ""
    echo "$INSTALL_DIR is not in your PATH."
    echo "To use greywall right now, run:"
    echo "  export PATH=\"\$PATH:$INSTALL_DIR\""
    echo ""
    echo "To make it permanent, add that line to your shell profile:"
    SHELL_NAME=$(basename "${SHELL:-/bin/sh}")
    case "$SHELL_NAME" in
      zsh)  echo "  echo 'export PATH=\"\$PATH:$INSTALL_DIR\"' >> ~/.zshrc" ;;
      bash) echo "  echo 'export PATH=\"\$PATH:$INSTALL_DIR\"' >> ~/.bashrc" ;;
      fish) echo "  fish_add_path $INSTALL_DIR" ;;
      *)    echo "  echo 'export PATH=\"\$PATH:$INSTALL_DIR\"' >> ~/.\${SHELL}rc" ;;
    esac
    ;;
esac

echo ""
echo "----"
echo ""

"$INSTALL_DIR/$BINARY" check