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342 lines
11 KiB
342 lines
11 KiB
#!/usr/bin/env bash
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# Copyright The Helm Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# The install script is based off of the MIT-licensed script from glide,
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# the package manager for Go: https://github.com/Masterminds/glide.sh/blob/master/get
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: ${BINARY_NAME:="helm"}
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: ${USE_SUDO:="true"}
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: ${DEBUG:="false"}
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: ${VERIFY_CHECKSUM:="true"}
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: ${VERIFY_SIGNATURES:="false"}
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: ${HELM_INSTALL_DIR:="/usr/local/bin"}
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: ${GPG_PUBRING:="pubring.kbx"}
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HAS_CURL="$(type "curl" &> /dev/null && echo true || echo false)"
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HAS_WGET="$(type "wget" &> /dev/null && echo true || echo false)"
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HAS_OPENSSL="$(type "openssl" &> /dev/null && echo true || echo false)"
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HAS_GPG="$(type "gpg" &> /dev/null && echo true || echo false)"
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HAS_GIT="$(type "git" &> /dev/null && echo true || echo false)"
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# initArch discovers the architecture for this system.
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initArch() {
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ARCH=$(uname -m)
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case $ARCH in
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armv5*) ARCH="armv5";;
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armv6*) ARCH="armv6";;
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armv7*) ARCH="arm";;
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aarch64) ARCH="arm64";;
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x86) ARCH="386";;
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x86_64) ARCH="amd64";;
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i686) ARCH="386";;
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i386) ARCH="386";;
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esac
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}
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# initOS discovers the operating system for this system.
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initOS() {
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OS=$(echo `uname`|tr '[:upper:]' '[:lower:]')
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case "$OS" in
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# Minimalist GNU for Windows
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mingw*|cygwin*) OS='windows';;
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esac
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}
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# runs the given command as root (detects if we are root already)
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runAsRoot() {
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if [ $EUID -ne 0 -a "$USE_SUDO" = "true" ]; then
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sudo "${@}"
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else
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"${@}"
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fi
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}
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# verifySupported checks that the os/arch combination is supported for
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# binary builds, as well whether or not necessary tools are present.
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verifySupported() {
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local supported="darwin-amd64\ndarwin-arm64\nlinux-386\nlinux-amd64\nlinux-arm\nlinux-arm64\nlinux-ppc64le\nlinux-s390x\nlinux-riscv64\nwindows-amd64\nwindows-arm64"
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if ! echo "${supported}" | grep -q "${OS}-${ARCH}"; then
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echo "No prebuilt binary for ${OS}-${ARCH}."
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echo "To build from source, go to https://github.com/helm/helm"
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exit 1
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fi
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if [ "${HAS_CURL}" != "true" ] && [ "${HAS_WGET}" != "true" ]; then
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echo "Either curl or wget is required"
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exit 1
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fi
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if [ "${VERIFY_CHECKSUM}" == "true" ] && [ "${HAS_OPENSSL}" != "true" ]; then
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echo "In order to verify checksum, openssl must first be installed."
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echo "Please install openssl or set VERIFY_CHECKSUM=false in your environment."
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exit 1
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fi
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if [ "${VERIFY_SIGNATURES}" == "true" ]; then
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if [ "${HAS_GPG}" != "true" ]; then
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echo "In order to verify signatures, gpg must first be installed."
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echo "Please install gpg or set VERIFY_SIGNATURES=false in your environment."
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exit 1
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fi
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if [ "${OS}" != "linux" ]; then
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echo "Signature verification is currently only supported on Linux."
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echo "Please set VERIFY_SIGNATURES=false or verify the signatures manually."
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exit 1
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fi
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fi
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if [ "${HAS_GIT}" != "true" ]; then
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echo "[WARNING] Could not find git. It is required for plugin installation."
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fi
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}
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# checkDesiredVersion checks if the desired version is available.
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checkDesiredVersion() {
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if [ "x$DESIRED_VERSION" == "x" ]; then
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# Get tag from release URL
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local latest_release_url="https://get.helm.sh/helm-latest-version"
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local latest_release_response=""
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if [ "${HAS_CURL}" == "true" ]; then
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latest_release_response=$( curl -L --silent --show-error --fail "$latest_release_url" 2>&1 || true )
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elif [ "${HAS_WGET}" == "true" ]; then
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latest_release_response=$( wget "$latest_release_url" -q -O - 2>&1 || true )
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fi
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TAG=$( echo "$latest_release_response" | grep '^v[0-9]' )
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if [ "x$TAG" == "x" ]; then
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printf "Could not retrieve the latest release tag information from %s: %s\n" "${latest_release_url}" "${latest_release_response}"
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exit 1
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fi
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else
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TAG=$DESIRED_VERSION
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fi
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}
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# checkHelmInstalledVersion checks which version of helm is installed and
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# if it needs to be changed.
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checkHelmInstalledVersion() {
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if [[ -f "${HELM_INSTALL_DIR}/${BINARY_NAME}" ]]; then
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local version=$("${HELM_INSTALL_DIR}/${BINARY_NAME}" version --template="{{ .Version }}")
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if [[ "$version" == "$TAG" ]]; then
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echo "Helm ${version} is already ${DESIRED_VERSION:-latest}"
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return 0
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else
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echo "Helm ${TAG} is available. Changing from version ${version}."
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return 1
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fi
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else
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return 1
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fi
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}
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# downloadFile downloads the latest binary package and also the checksum
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# for that binary.
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downloadFile() {
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HELM_DIST="helm-$TAG-$OS-$ARCH.tar.gz"
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DOWNLOAD_URL="https://get.helm.sh/$HELM_DIST"
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CHECKSUM_URL="$DOWNLOAD_URL.sha256"
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HELM_TMP_ROOT="$(mktemp -dt helm-installer-XXXXXX)"
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HELM_TMP_FILE="$HELM_TMP_ROOT/$HELM_DIST"
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HELM_SUM_FILE="$HELM_TMP_ROOT/$HELM_DIST.sha256"
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echo "Downloading $DOWNLOAD_URL"
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if [ "${HAS_CURL}" == "true" ]; then
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curl -SsL "$CHECKSUM_URL" -o "$HELM_SUM_FILE"
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curl -SsL "$DOWNLOAD_URL" -o "$HELM_TMP_FILE"
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elif [ "${HAS_WGET}" == "true" ]; then
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wget -q -O "$HELM_SUM_FILE" "$CHECKSUM_URL"
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wget -q -O "$HELM_TMP_FILE" "$DOWNLOAD_URL"
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fi
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}
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# verifyFile verifies the SHA256 checksum of the binary package
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# and the GPG signatures for both the package and checksum file
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# (depending on settings in environment).
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verifyFile() {
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if [ "${VERIFY_CHECKSUM}" == "true" ]; then
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verifyChecksum
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fi
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if [ "${VERIFY_SIGNATURES}" == "true" ]; then
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verifySignatures
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fi
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}
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# installFile installs the Helm binary.
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installFile() {
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HELM_TMP="$HELM_TMP_ROOT/$BINARY_NAME"
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mkdir -p "$HELM_TMP"
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tar xf "$HELM_TMP_FILE" -C "$HELM_TMP"
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HELM_TMP_BIN="$HELM_TMP/$OS-$ARCH/helm"
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echo "Preparing to install $BINARY_NAME into ${HELM_INSTALL_DIR}"
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runAsRoot cp "$HELM_TMP_BIN" "$HELM_INSTALL_DIR/$BINARY_NAME"
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echo "$BINARY_NAME installed into $HELM_INSTALL_DIR/$BINARY_NAME"
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}
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# verifyChecksum verifies the SHA256 checksum of the binary package.
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verifyChecksum() {
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printf "Verifying checksum... "
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local sum=$(openssl sha1 -sha256 ${HELM_TMP_FILE} | awk '{print $2}')
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local expected_sum=$(cat ${HELM_SUM_FILE})
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if [ "$sum" != "$expected_sum" ]; then
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echo "SHA sum of ${HELM_TMP_FILE} does not match. Aborting."
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exit 1
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fi
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echo "Done."
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}
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# verifySignatures obtains the latest KEYS file from GitHub main branch
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# as well as the signature .asc files from the specific GitHub release,
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# then verifies that the release artifacts were signed by a maintainer's key.
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verifySignatures() {
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printf "Verifying signatures... "
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local keys_filename="KEYS"
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local github_keys_url="https://raw.githubusercontent.com/helm/helm/main/${keys_filename}"
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if [ "${HAS_CURL}" == "true" ]; then
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curl -SsL "${github_keys_url}" -o "${HELM_TMP_ROOT}/${keys_filename}"
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elif [ "${HAS_WGET}" == "true" ]; then
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wget -q -O "${HELM_TMP_ROOT}/${keys_filename}" "${github_keys_url}"
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fi
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local gpg_keyring="${HELM_TMP_ROOT}/keyring.gpg"
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local gpg_homedir="${HELM_TMP_ROOT}/gnupg"
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mkdir -p -m 0700 "${gpg_homedir}"
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local gpg_stderr_device="/dev/null"
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if [ "${DEBUG}" == "true" ]; then
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gpg_stderr_device="/dev/stderr"
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fi
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gpg --batch --quiet --homedir="${gpg_homedir}" --import "${HELM_TMP_ROOT}/${keys_filename}" 2> "${gpg_stderr_device}"
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gpg --batch --no-default-keyring --keyring "${gpg_homedir}/${GPG_PUBRING}" --export > "${gpg_keyring}"
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local github_release_url="https://github.com/helm/helm/releases/download/${TAG}"
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if [ "${HAS_CURL}" == "true" ]; then
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curl -SsL "${github_release_url}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc" -o "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc"
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curl -SsL "${github_release_url}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc" -o "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc"
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elif [ "${HAS_WGET}" == "true" ]; then
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wget -q -O "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc" "${github_release_url}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc"
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wget -q -O "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc" "${github_release_url}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc"
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fi
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local error_text="If you think this might be a potential security issue,"
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error_text="${error_text}\nplease see here: https://github.com/helm/community/blob/master/SECURITY.md"
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local num_goodlines_sha=$(gpg --verify --keyring="${gpg_keyring}" --status-fd=1 "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256.asc" 2> "${gpg_stderr_device}" | grep -c -E '^\[GNUPG:\] (GOODSIG|VALIDSIG)')
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if [[ ${num_goodlines_sha} -lt 2 ]]; then
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echo "Unable to verify the signature of helm-${TAG}-${OS}-${ARCH}.tar.gz.sha256!"
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echo -e "${error_text}"
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exit 1
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fi
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local num_goodlines_tar=$(gpg --verify --keyring="${gpg_keyring}" --status-fd=1 "${HELM_TMP_ROOT}/helm-${TAG}-${OS}-${ARCH}.tar.gz.asc" 2> "${gpg_stderr_device}" | grep -c -E '^\[GNUPG:\] (GOODSIG|VALIDSIG)')
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if [[ ${num_goodlines_tar} -lt 2 ]]; then
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echo "Unable to verify the signature of helm-${TAG}-${OS}-${ARCH}.tar.gz!"
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echo -e "${error_text}"
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exit 1
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fi
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echo "Done."
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}
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# fail_trap is executed if an error occurs.
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fail_trap() {
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result=$?
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if [ "$result" != "0" ]; then
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if [[ -n "$INPUT_ARGUMENTS" ]]; then
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echo "Failed to install $BINARY_NAME with the arguments provided: $INPUT_ARGUMENTS"
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help
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else
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echo "Failed to install $BINARY_NAME"
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fi
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echo -e "\tFor support, go to https://github.com/helm/helm."
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fi
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cleanup
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exit $result
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}
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# testVersion tests the installed client to make sure it is working.
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testVersion() {
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set +e
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HELM="$(command -v $BINARY_NAME)"
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if [ "$?" = "1" ]; then
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echo "$BINARY_NAME not found. Is $HELM_INSTALL_DIR on your "'$PATH?'
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exit 1
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fi
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set -e
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}
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# help provides possible cli installation arguments
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help () {
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echo "Accepted cli arguments are:"
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echo -e "\t[--help|-h ] ->> prints this help"
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echo -e "\t[--version|-v <desired_version>] . When not defined it fetches the latest release from GitHub"
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echo -e "\te.g. --version v3.0.0 or -v canary"
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echo -e "\t[--no-sudo] ->> install without sudo"
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}
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# cleanup temporary files to avoid https://github.com/helm/helm/issues/2977
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cleanup() {
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if [[ -d "${HELM_TMP_ROOT:-}" ]]; then
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rm -rf "$HELM_TMP_ROOT"
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fi
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}
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# Execution
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#Stop execution on any error
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trap "fail_trap" EXIT
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set -e
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# Set debug if desired
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if [ "${DEBUG}" == "true" ]; then
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set -x
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fi
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# Parsing input arguments (if any)
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export INPUT_ARGUMENTS="${@}"
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set -u
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while [[ $# -gt 0 ]]; do
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case $1 in
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'--version'|-v)
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shift
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if [[ $# -ne 0 ]]; then
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export DESIRED_VERSION="${1}"
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if [[ "$1" != "v"* ]]; then
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echo "Expected version arg ('${DESIRED_VERSION}') to begin with 'v', fixing..."
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export DESIRED_VERSION="v${1}"
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fi
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else
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echo -e "Please provide the desired version. e.g. --version v3.0.0 or -v canary"
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exit 0
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fi
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;;
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'--no-sudo')
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USE_SUDO="false"
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;;
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'--help'|-h)
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help
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exit 0
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;;
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*) exit 1
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;;
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esac
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shift
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done
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set +u
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initArch
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initOS
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verifySupported
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checkDesiredVersion
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if ! checkHelmInstalledVersion; then
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downloadFile
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verifyFile
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installFile
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fi
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testVersion
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cleanup
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