From 8304281e3eced7b7d7dd785c59567e120da12de1 Mon Sep 17 00:00:00 2001
From: Amine Benseddik <amine.benseddik@gmail.com>
Date: Tue, 5 Nov 2024 11:24:07 +0000
Subject: [PATCH] feat: Distribute as helm plugin

Signed-off-by: Amine Benseddik <amine.benseddik@gmail.com>
---
 README.md         |   6 ++
 install-binary.sh | 198 ++++++++++++++++++++++++++++++++++++++++++++++
 plugin.yaml       |   9 +++
 3 files changed, 213 insertions(+)
 create mode 100755 install-binary.sh
 create mode 100644 plugin.yaml

diff --git a/README.md b/README.md
index 6d27b09..170769b 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,12 @@ Via `podman/docker`:
 podman run --rm -v $PWD:/home/helm-schema ghcr.io/dadav/helm-schema:latest
 ```
 
+As `helm plugin`:
+
+```sh
+helm plugin install https://github.com/dadav/helm-schema/cmd/helm-schema.git
+```
+
 ## Usage
 
 ### Pre-commit hook
diff --git a/install-binary.sh b/install-binary.sh
new file mode 100755
index 0000000..46e5a52
--- /dev/null
+++ b/install-binary.sh
@@ -0,0 +1,198 @@
+#!/usr/bin/env sh
+
+# Shamelessly copied from https://github.com/technosophos/helm-template/blob/master/install-binary.sh
+
+PROJECT_NAME="helm-schema"
+BINARY_NAME="helm-schema"
+PROJECT_GH="dadav/$PROJECT_NAME"
+PLUGIN_MANIFEST="plugin.yaml"
+
+# Convert HELM_BIN and HELM_PLUGIN_DIR to unix if cygpath is
+# available. This is the case when using MSYS2 or Cygwin
+# on Windows where helm returns a Windows path but we
+# need a Unix path
+
+if command -v cygpath >/dev/null 2>&1; then
+  HELM_BIN="$(cygpath -u "${HELM_BIN}")"
+  HELM_PLUGIN_DIR="$(cygpath -u "${HELM_PLUGIN_DIR}")"
+fi
+
+[ -z "$HELM_BIN" ] && HELM_BIN=$(command -v helm)
+
+[ -z "$HELM_HOME" ] && HELM_HOME=$(helm env | grep 'HELM_DATA_HOME' | cut -d '=' -f2 | tr -d '"')
+
+mkdir -p "$HELM_HOME"
+
+if [ "$SKIP_BIN_INSTALL" = "1" ]; then
+  echo "Skipping binary install"
+  exit
+fi
+
+# which mode is the common installer script running in.
+SCRIPT_MODE="install"
+if [ "$1" = "-u" ]; then
+  SCRIPT_MODE="update"
+fi
+
+# initArch discovers the architecture for this system.
+initArch() {
+  ARCH=$(uname -m)
+  case $ARCH in
+  armv6*) ARCH="armv6" ;;
+  armv7*) ARCH="armv7" ;;
+  aarch64 | arm64) arch="arm64" ;;
+  x86_64 | amd64) ARCH="x86_64" ;;
+  *)
+    echo "Arch '$(uname -m)' not supported!" >&2
+    exit 1
+    ;;
+  esac
+}
+
+# initOS discovers the operating system for this system.
+initOS() {
+  OS=$(uname -s)
+
+  case "$OS" in
+  Windows_NT) OS='Windows' ;;
+  # Msys support
+  MSYS*) OS='Windows' ;;
+  # Minimalist GNU for Windows
+  MINGW*) OS='Windows' ;;
+  CYGWIN*) OS='Windows' ;;
+  Darwin) OS='Darwin' ;;
+  Linux) OS='Linux' ;;
+  *)
+    echo "OS '$(uname)' not supported!" >&2
+    exit 1
+    ;;
+  esac
+}
+
+# verifySupported checks that the os/arch combination is supported for binary builds.
+verifySupported() {
+  supported="Linux-x86_64\nLinux-arm64\nLinux-armv6\nLinux-armv7\nDarwin-x86_64\nDarwin-arm64\nWindows-x86_64\nWindows-arm64\nWindows-armv6\nWindows-armv7"
+  if ! echo "${supported}" | grep -q "${OS}-${ARCH}"; then
+    echo "No prebuild binary for ${OS}-${ARCH}."
+    exit 1
+  fi
+
+  if
+    ! command -v curl >/dev/null 2>&1 && ! command -v wget >/dev/null 2>&1
+  then
+    echo "Either curl or wget is required"
+    exit 1
+  fi
+}
+
+# getDownloadURL retrieves the download URL and checksum URL.
+getDownloadURL() {
+  version="$(grep <"$HELM_PLUGIN_DIR/$PLUGIN_MANIFEST" "version" | cut -d '"' -f 2)"
+  ext="tar.gz"
+  if [ "$OS" = "Windows" ]; then
+    ext="zip"
+  fi
+  if [ "$SCRIPT_MODE" = "install" ] && [ -n "$version" ]; then
+    DOWNLOAD_URL="https://github.com/${PROJECT_GH}/releases/download/${version}/${PROJECT_NAME}_${version}_${OS}_${ARCH}.${ext}"
+    CHECKSUM_URL="https://github.com/${PROJECT_GH}/releases/download/${version}/checksums.txt"
+  else
+    DOWNLOAD_URL="https://github.com/${PROJECT_GH}/releases/latest/download/${PROJECT_NAME}_${version}_${OS}_${ARCH}.${ext}"
+    CHECKSUM_URL="https://github.com/${PROJECT_GH}/releases/latest/download/checksums.txt"
+  fi
+}
+
+# Temporary dir
+mkTempDir() {
+  HELM_TMP="$(mktemp -d -t "${PROJECT_NAME}-XXXXXX")"
+}
+
+rmTempDir() {
+  if [ -d "${HELM_TMP:-/tmp/helm-schema}" ]; then
+    rm -rf "${HELM_TMP:-/tmp/helm-schema}"
+  fi
+}
+
+# downloadFile downloads the latest binary package and the checksum.
+downloadFile() {
+  PLUGIN_TMP_FILE="${HELM_TMP}/${PROJECT_NAME}.tar.gz"
+  PLUGIN_CHECKSUMS_FILE="${HELM_TMP}/${PROJECT_NAME}_checksums.txt"
+  echo "Downloading ..."
+  echo "$DOWNLOAD_URL"
+  echo "$CHECKSUM_URL"
+  if
+    command -v curl >/dev/null 2>&1
+  then
+    curl -sSf -L "$DOWNLOAD_URL" >"$PLUGIN_TMP_FILE"
+    curl -sSf -L "$CHECKSUM_URL" >"$PLUGIN_CHECKSUMS_FILE"
+  elif
+    command -v wget >/dev/null 2>&1
+  then
+    wget -q -O - "$DOWNLOAD_URL" >"$PLUGIN_TMP_FILE"
+    wget -q -O - "$CHECKSUM_URL" >"$PLUGIN_CHECKSUMS_FILE"
+  fi
+}
+
+validateChecksum() {
+  if ! grep -q ${1} ${2}; then
+    echo "Invalid checksum" >/dev/stderr
+    exit 1
+  fi
+  echo "Checksum is valid."
+}
+
+# installFile verifies the SHA256 for the file, then unpacks and installs it.
+installFile() {
+  if command -v sha256sumN >/dev/null 2>&1; then
+    checksum=$(sha256sum ${PLUGIN_TMP_FILE} | awk '{ print $1 }')
+    validateChecksum ${checksum} ${PLUGIN_CHECKSUMS_FILE}
+  elif command -v openssl >/dev/null 2>&1; then
+    checksum=$(openssl dgst -sha256 ${PLUGIN_TMP_FILE} | awk '{ print $2 }')
+    validateChecksum ${checksum} ${PLUGIN_CHECKSUMS_FILE}
+  else
+    echo "WARNING: no tool found to verify checksum" >/dev/stderr
+  fi
+
+  HELM_TMP_BIN="$HELM_TMP/$BINARY_NAME"
+  if [ "${OS}" = "Windows" ]; then
+    HELM_TMP_BIN="$HELM_TMP_BIN.exe"
+    unzip "$PLUGIN_TMP_FILE" -d "$HELM_TMP"
+  else
+    tar xzf "$PLUGIN_TMP_FILE" -C "$HELM_TMP"
+  fi
+  echo "Preparing to install into ${HELM_PLUGIN_DIR}"
+  mkdir -p "$HELM_PLUGIN_DIR/bin"
+  cp "$HELM_TMP_BIN" "$HELM_PLUGIN_DIR/bin"
+}
+
+# exit_trap is executed if on exit (error or not).
+exit_trap() {
+  result=$?
+  rmTempDir
+  if [ "$result" != "0" ]; then
+    echo "Failed to install $PROJECT_NAME"
+    printf "\tFor support, go to https://github.com/%s.\n" "$PROJECT_GH"
+  fi
+  exit $result
+}
+
+# testVersion tests the installed client to make sure it is working.
+testVersion() {
+  set +e
+  echo "$PROJECT_NAME installed into $HELM_PLUGIN_DIR"
+  "${HELM_PLUGIN_DIR}/bin/$BINARY_NAME" --version
+  set -e
+}
+
+# Execution
+
+#Stop execution on any error
+trap "exit_trap" EXIT
+set -e
+initArch
+initOS
+verifySupported
+getDownloadURL
+mkTempDir
+downloadFile
+installFile
+testVersion
diff --git a/plugin.yaml b/plugin.yaml
new file mode 100644
index 0000000..e413b26
--- /dev/null
+++ b/plugin.yaml
@@ -0,0 +1,9 @@
+name: "schema"
+version: "0.14.1"
+usage: "generate JSON schemas for your Helm charts"
+description: |-
+  Generate JSON schemas for your Helm charts
+command: "$HELM_PLUGIN_DIR/bin/helm-schema"
+hooks:
+  install: "$HELM_PLUGIN_DIR/install-binary.sh"
+  update: "$HELM_PLUGIN_DIR/install-binary.sh -u"