Dawn installer — one-line install from GitHub Releases

install.sh

#!/bin/sh
# Dawn installer — downloads the latest release from GitHub using the gh CLI.
#
# Usage:
#   ./install.sh
#
# Options (environment variables):
#   DAWN_INSTALL_DIR  Override install directory (default: ~/.local/bin)
#   VERSION           Install a specific version (default: latest)
#
# Requirements:
#   - gh CLI (https://cli.github.com) installed and authenticated

set -eu

REPO="antonl/dawn"
INSTALL_DIR="${DAWN_INSTALL_DIR:-$HOME/.local/bin}"

# --- Check for gh CLI ---

if ! command -v gh >/dev/null 2>&1; then
  echo "Error: gh CLI is required but not installed." >&2
  echo "Install it from https://cli.github.com" >&2
  exit 1
fi

if ! gh auth status >/dev/null 2>&1; then
  echo "Error: gh CLI is not authenticated. Run 'gh auth login' first." >&2
  exit 1
fi

# --- Detect platform ---

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

case "$OS" in
  Darwin) OS="darwin" ;;
  Linux)  OS="linux" ;;
  *)
    echo "Error: Unsupported operating system: $OS" >&2
    exit 1
    ;;
esac

case "$ARCH" in
  x86_64)  ARCH="amd64" ;;
  aarch64) ARCH="arm64" ;;
  arm64)   ARCH="arm64" ;;
  *)
    echo "Error: Unsupported architecture: $ARCH" >&2
    exit 1
    ;;
esac

# --- Resolve version ---

if [ -z "${VERSION:-}" ]; then
  VERSION="$(gh release view --repo "$REPO" --json tagName --jq .tagName 2>/dev/null)" || true
  if [ -z "$VERSION" ]; then
    echo "Error: Could not determine latest release version." >&2
    echo "Check https://github.com/${REPO}/releases" >&2
    exit 1
  fi
fi

TARBALL="dawn-${OS}-${ARCH}.tar.gz"

echo "Installing dawn ${VERSION} (${OS}/${ARCH})..."

# --- Download and extract ---

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

if ! gh release download "$VERSION" --repo "$REPO" --pattern "$TARBALL" --dir "$TMPDIR"; then
  echo "Error: Failed to download ${TARBALL} from ${REPO}." >&2
  echo "Check that the release exists and has a ${TARBALL} asset." >&2
  exit 1
fi

tar -xzf "${TMPDIR}/${TARBALL}" -C "$TMPDIR"

# --- Install ---

mkdir -p "$INSTALL_DIR"
mv "${TMPDIR}/dawn" "${INSTALL_DIR}/dawn"
chmod +x "${INSTALL_DIR}/dawn"

echo "Installed dawn to ${INSTALL_DIR}/dawn"

# --- PATH check ---

case ":${PATH}:" in
  *":${INSTALL_DIR}:"*) ;;
  *)
    echo ""
    echo "Add ${INSTALL_DIR} to your PATH:"
    echo ""
    echo "  export PATH=\"${INSTALL_DIR}:\$PATH\""
    echo ""
    echo "Add the line above to your shell profile (~/.bashrc, ~/.zshrc, etc.)"
    ;;
esac

# --- Verify ---

if command -v dawn >/dev/null 2>&1; then
  echo ""
  dawn version
fi