feat: add install hgctl hack script (#276)

Signed-off-by: bitliu <bitliu@tencent.com>

tools/hack/get-hgctl.sh

@@ -0,0 +1,183 @@
+#  Copyright (c) 2022 Alibaba Group Holding Ltd.
+
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+
+#       http:www.apache.org/licenses/LICENSE-2.0
+
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+#!/usr/bin/env bash
+
+: "${BINARY_NAME:="hgctl"}"
+: "${hgctl_INSTALL_DIR:="/usr/local/bin"}"
+
+export VERSION
+
+HAS_CURL="$(type "curl" &> /dev/null && echo true || echo false)"
+HAS_WGET="$(type "wget" &> /dev/null && echo true || echo false)"
+HAS_GIT="$(type "git" &> /dev/null && echo true || echo false)"
+
+# initArch discovers the architecture for this system.
+initArch() {
+  ARCH=$(uname -m)
+  case $ARCH in
+    armv5*) ARCH="armv5";;
+    armv6*) ARCH="armv6";;
+    armv7*) ARCH="arm";;
+    aarch64) ARCH="arm64";;
+    x86) ARCH="386";;
+    x86_64) ARCH="amd64";;
+    i686) ARCH="386";;
+    i386) ARCH="386";;
+  esac
+}
+
+# initOS discovers the operating system for this system.
+initOS() {
+  OS="$(uname|tr '[:upper:]' '[:lower:]')"
+
+  case "$OS" in
+    # Minimalist GNU for Windows
+    mingw*|cygwin*) OS='windows';;
+  esac
+}
+
+# runs the given command as root (detects if we are root already)
+runAsRoot() {
+  if [ $EUID -ne 0 ]; then
+    sudo "${@}"
+  else
+    "${@}"
+  fi
+}
+
+# verifySupported checks that the os/arch combination is supported for
+# binary builds, as well whether or not necessary tools are present.
+verifySupported() {
+  local supported="darwin-amd64\ndarwin-arm64\nlinux-amd64\nlinux-arm64\n"
+  if ! echo "${supported}" | grep -q "${OS}-${ARCH}"; then
+    echo "No prebuilt binary for ${OS}-${ARCH}."
+    echo "To build from source, go to https://github.com/alibaba/higress"
+    exit 1
+  fi
+
+  if [ "${HAS_CURL}" != "true" ] && [ "${HAS_WGET}" != "true" ]; then
+    echo "Either curl or wget is required"
+    exit 1
+  fi
+
+  if [ "${HAS_GIT}" != "true" ]; then
+    echo "[WARNING] Could not find git. It is required for plugin installation."
+  fi
+}
+
+# checkDesiredVersion checks if the desired version is available.
+checkDesiredVersion() {
+  if [ "$VERSION" == "" ]; then
+    # Get tag from release URL
+    local latest_release_url="https://github.com/alibaba/higress/releases"
+    if [ "${HAS_CURL}" == "true" ]; then
+      VERSION=$(curl -Ls $latest_release_url | grep 'href="/alibaba/higress/releases/tag/v[0-9]*.[0-9]*.[0-9]*\"' | sed -E 's/.*\/alibaba\/higress\/releases\/tag\/(v[0-9\.]+)".*/\1/g' | head -1)
+    elif [ "${HAS_WGET}" == "true" ]; then
+      VERSION=$(wget $latest_release_url -O - 2>&1 | grep 'href="/alibaba/higress/releases/tag/v[0-9]*.[0-9]*.[0-9]*\"' | sed -E 's/.*\/alibaba\/higress\/releases\/tag\/(v[0-9\.]+)".*/\1/g' | head -1)
+    fi
+  fi
+}
+
+# checkhgctlInstalledVersion checks which version of hgctl is installed and
+# if it needs to be changed.
+checkhgctlInstalledVersion() {
+  if [[ -f "${hgctl_INSTALL_DIR}/${BINARY_NAME}" ]]; then
+    version=$("${hgctl_INSTALL_DIR}/${BINARY_NAME}" version --client | grep -Eo "v[0-9]+\.[0-9]+.*" )
+    if [[ "$version" == "$VERSION" ]]; then
+      echo "hgctl ${version} is already ${VERSION:-latest}"
+      return 0
+    else
+      echo "hgctl ${VERSION} is available. Changing from version ${version}."
+      return 1
+    fi
+  else
+    return 1
+  fi
+}
+
+# downloadFile downloads the latest binary package
+# for that binary.
+downloadFile() {
+  hgctl_DIST="hgctl_${VERSION}_${OS}_${ARCH}.tar.gz"
+  DOWNLOAD_URL="https://github.com/alibaba/higress/releases/download/$VERSION/$hgctl_DIST"
+  hgctl_TMP_ROOT="$(mktemp -dt hgctl-installer-XXXXXX)"
+  hgctl_TMP_FILE="$hgctl_TMP_ROOT/$hgctl_DIST"
+  echo "Downloading $DOWNLOAD_URL"
+  if [ "${HAS_CURL}" == "true" ]; then
+    curl -SsL "$DOWNLOAD_URL" -o "$hgctl_TMP_FILE"
+  elif [ "${HAS_WGET}" == "true" ]; then
+    wget -q -O "$hgctl_TMP_FILE" "$DOWNLOAD_URL"
+  fi
+}
+
+# installFile installs the hgctl binary.
+installFile() {
+  hgctl_TMP="$hgctl_TMP_ROOT/$BINARY_NAME"
+  mkdir -p "$hgctl_TMP"
+  tar xf "$hgctl_TMP_FILE" -C "$hgctl_TMP"
+  hgctl_TMP_BIN="$hgctl_TMP/out/${OS}_${ARCH}/hgctl"
+  echo "Preparing to install $BINARY_NAME into ${hgctl_INSTALL_DIR}"
+  runAsRoot cp "$hgctl_TMP_BIN" "$hgctl_INSTALL_DIR/$BINARY_NAME"
+  echo "$BINARY_NAME installed into $hgctl_INSTALL_DIR/$BINARY_NAME"
+}
+
+# fail_trap is executed if an error occurs.
+fail_trap() {
+  result=$?
+  if [ "$result" != "0" ]; then
+    if [[ -n "$INPUT_ARGUMENTS" ]]; then
+      echo "Failed to install $BINARY_NAME with the arguments provided: $INPUT_ARGUMENTS"
+    else
+      echo "Failed to install $BINARY_NAME"
+    fi
+    echo -e "\tFor support, go to https://github.com/alibaba/higress."
+  fi
+  cleanup
+  exit $result
+}
+
+# testVersion tests the installed client to make sure it is working.
+testVersion() {
+  set +e
+  if ! [ "$(command -v $BINARY_NAME)" ]; then
+    echo "$BINARY_NAME not found. Is $hgctl_INSTALL_DIR on your PATH?"
+    exit 1
+  fi
+  set -e
+}
+
+# cleanup temporary files.
+cleanup() {
+  if [[ -d "${hgctl_TMP_ROOT:-}" ]]; then
+    rm -rf "$hgctl_TMP_ROOT"
+  fi
+}
+
+# Execution
+
+#Stop execution on any error
+trap "fail_trap" EXIT
+set -e
+
+initArch
+initOS
+verifySupported
+checkDesiredVersion
+if ! checkhgctlInstalledVersion; then
+  downloadFile
+  installFile
+fi
+testVersion
+cleanup