Helm Maven Plugin

This is a Maven plugin for testing, packaging and uploading HELM charts. "HELM is a tool for managing Kubernetes charts. Charts are packages of pre-configured Kubernetes resources."

Visit https://docs.helm.sh for detailed information.

Currently the upload to ChartMuseum, Artifactory and Nexus is supported.

Helm v3

From version 5.0 Helm v3 is required. There is no longer support for Helm v2. For convenience reasons the stable repo is added by default.

Helm v2 users can still use plugin version 4.13.

Why?

Currently (October 2017) there is no simple Maven plugin to package existing HELM charts.

How?

By default, the plugin automatically downloads Helm at the specified version. You can also manually specify the download URL. Next to that it is possible to specify a local Helm binary. In all cases Helm will be executed in the background.

Add following dependency to your pom.xml:

<dependency>
  <groupId>io.kokuwa.maven</groupId>
  <artifactId>helm-maven-plugin</artifactId>
  <version>6.11.0</version>
</dependency>

Configuration Examples

Helm URL Auto Detection

The default setting is to construct the Helm download URL based upon the detected OS and architecture:

<build>
  <plugins>
    <plugin>
      <groupId>io.kokuwa.maven</groupId>
      <artifactId>helm-maven-plugin</artifactId>
      <version>6.11.0</version>
      <configuration>
        <chartDirectory>${project.basedir}</chartDirectory>
        <chartVersion>${project.version}</chartVersion>
      </configuration>
    </plugin>
  </plugins>
</build>

If you leave helmVersion and helmDownloadUrl empty the plugin will determine the latest version based on [https://api.github.com/repos/helm/helm/releases/latest].

Usage with Downloaded Binary

<build>
  <plugins>
  ...
    <plugin>
      <groupId>io.kokuwa.maven</groupId>
      <artifactId>helm-maven-plugin</artifactId>
      <version>6.11.0</version>
      <configuration>
        <chartDirectory>${project.basedir}</chartDirectory>
        <chartVersion>${project.version}</chartVersion>
        <!-- This is the related section when using binary download -->
        <helmDownloadUrl>https://get.helm.sh/helm-v3.8.1-linux-amd64.tar.gz</helmDownloadUrl>
      </configuration>
    </plugin>
  ...
  </plugins>
</build>

Usage with Local Binary

When useLocalHelmBinary is enabled, the plugin by default will search for the helm executable in PATH:

<build>
  <plugins>
  ...
    <plugin>
      <groupId>io.kokuwa.maven</groupId>
      <artifactId>helm-maven-plugin</artifactId>
      <version>6.11.0</version>
      <configuration>
        <chartDirectory>${project.basedir}</chartDirectory>
        <chartVersion>${project.version}</chartVersion>
        <!-- This is the related section to use local binary with auto-detection enabled. -->
        <useLocalHelmBinary>true</useLocalHelmBinary>
      </configuration>
    </plugin>
  ...
  </plugins>
</build>

The following is an example configuration that explicitly sets the directory in which to look for the helm executable, and disables the auto-detection feature:

<build>
  <plugins>
  ...
    <plugin>
      <groupId>io.kokuwa.maven</groupId>
      <artifactId>helm-maven-plugin</artifactId>
      <version>6.11.0</version>
      <configuration>
        <chartDirectory>${project.basedir}</chartDirectory>
        <chartVersion>${project.version}</chartVersion>
        <!-- This is the related section to use local binary with auto-detection disabled. -->
        <useLocalHelmBinary>true</useLocalHelmBinary>
        <autoDetectLocalHelmBinary>false</autoDetectLocalHelmBinary>
        <helmExecutableDirectory>/usr/local/bin</helmExecutableDirectory>        
      </configuration>
    </plugin>
  ...
  </plugins>
</build>

Configure Plugin to Use Credentials from settings.xml for Upload

<build>
  <plugins>
  ...
    <plugin>
      <groupId>io.kokuwa.maven</groupId>
      <artifactId>helm-maven-plugin</artifactId>
      <version>6.11.0</version>
      <configuration>
        <chartDirectory>${project.basedir}</chartDirectory>
        <chartVersion>${project.version}</chartVersion>
        <!-- This is the related section to configure upload repos -->
        <uploadRepoStable>
            <name>stable-repo</name>
            <url>https://repo.example.com/artifactory/helm-stable</url>
            <type>ARTIFACTORY</type>
        </uploadRepoStable>
        <uploadRepoSnapshot>
            <name>snapshot-repo</name>
            <url>https://my.chart.museum:8080/api/charts</url>
            <type>CHARTMUSEUM</type>
        </uploadRepoSnapshot>
        <helmDownloadUrl>https://get.helm.sh/helm-v3.8.1-linux-amd64.tar.gz</helmDownloadUrl>
      </configuration>
    </plugin>
  ...
  </plugins>
</build>

More Complex Example

<build>
  <plugins>
  ...
    <plugin>
      <groupId>io.kokuwa.maven</groupId>
      <artifactId>helm-maven-plugin</artifactId>
      <version>6.11.0</version>
      <configuration>
        <chartDirectory>${project.basedir}</chartDirectory>
        <chartVersion>${project.version}</chartVersion>
        <uploadRepoStable>
            <name>stable-repo</name>
            <url>https://repo.example.com/artifactory/helm-stable</url>
            <type>ARTIFACTORY</type>
            <username>foo</username>
            <password>bar</password>
        </uploadRepoStable>
        <uploadRepoSnapshot>
            <name>snapshot-repo</name>
            <url>https://my.chart.museum/api/charts</url>
            <type>CHARTMUSEUM</type>
        </uploadRepoSnapshot>
        <helmDownloadUrl>https://get.helm.sh/helm-v3.8.2-linux-amd64.tar.gz</helmDownloadUrl>
        <registryConfig>~/.config/helm/registry.json</registryConfig>
        <repositoryCache>~/.cache/helm/repository</repositoryCache>
        <repositoryConfig>~/.config/helm/repositories.yaml</repositoryConfig>
        <!-- Add a gpg signature to the chart -->
        <keyring>~/.gpg/secring.gpg</keyring>
        <key>MySigningKey</key>
        <passphrase>SecretPassPhrase</passphrase>
        <!-- Lint with strict mode -->
        <lintStrict>true</lintStrict>
        <!-- Disable adding of default repo stable https://charts.helm.sh/stable -->
        <addDefaultRepo>false</addDefaultRepo>
        <!-- Exclude a directory to avoid processing -->
        <excludes>
          <exclude>${project.basedir}/excluded</exclude>
          <exclude>${project.basedir}/**/excluded*</exclude>
        </excludes>
        <!-- Add an additional repo -->
        <helmExtraRepos>
          <helmRepo>
            <name>kokuwa</name>
            <url>https://kokuwa.github.io</url>
          </helmRepo>
        </helmExtraRepos>
        <!-- extra value settings for the lint command -->
        <values>
          <overrides>
            <component1.install.path>/opt/component1</component1.install.path>
          </overrides>
          <yamlFile>${project.basedir}/src/test/resources/myOverrides.yaml</yamlFile>
          <yamlFiles>
              <yamlFile>${project.basedir}/src/test/resources/myOverrides-1.yaml</yamlFile>
              <yamlFile>${project.basedir}/src/test/resources/myOverrides-2.yaml</yamlFile>
          </yamlFiles>
        </values>
      </configuration>
    </plugin>
  ...
  </plugins>
</build>

Features

• Package Helm charts from standard folder structure
• Test Helm charts (Helm lint)
• Recursive chart detection (subcharts)
• Helm does not need to be installed
• Upload to ChartMuseum or Artifactory
• Repository names are interpreted as server IDs to retrieve basic authentication from server list in settings.xml.

Usage

Goals

• helm:init initializes Helm by downloading a specific version
• helm:dependency-build resolves the chart dependencies
• helm:package packages the given charts (chart.tar.gz)
• helm:lint tests the given charts
• helm:template Locally render templates
• helm:dry-run simulates an install
• helm:upload upload charts via HTTP PUT
• helm:registry-login login into docker registry
• helm:registry-logout login from docker registry
• helm:push push charts to OCI (docker registry)
• helm:upgrade upgrade an already existing installation

Configuration

Parameter	Type	User Property	Required	Description
<chartDirectory>	string	helm.chartDirectory	true	root directory of your charts
<chartVersion>	string	helm.chartVersion	true	Version of the charts. The version have to be in the SEMVER-Format, required by helm.
<appVersion>	string	helm.appVersion	false	The version of the app. This needn't be SemVer.
<helmDownloadUrl>	string	helm.downloadUrl	false	URL to download helm. Leave empty to autodetect URL based upon OS and architecture.
<helmDownloadUser>	string	helm.downloadUser	false	Username used to authenticate while downloading helm binary package
<helmDownloadPassword>	string	helm.downloadPassword	false	Password used to authenticate while downloading helm binary package
<helmDownloadServerId>	string	helm.downloadServerId	false	Server Id in settings.xml which has username and password used to authenticate while downloading helm binary package
<helmVersion>	string	helm.version	false	Version of helm to download.
<githubUserAgent>	string	helm.githubUserAgent	false	To determine latest helm version this plugin uses the Github API. Therefore a user agent is needed. Defaults to kokuwaio/helm-maven-plugin
<tmpDir>	string	helm.tmpDir	false	Directory where to store cached Github responses. Defaults to ${java.io.tmpdir}/helm-maven-plugin
<excludes>	list of strings	helm.excludes	false	list of chart directories to exclude
<useLocalHelmBinary>	boolean	helm.useLocalHelmBinary	false	Controls whether a local binary should be used instead of downloading it. If set to true path has to be set with property executableDirectory
<autoDetectLocalHelmBinary>	boolean	helm.autoDetectLocalHelmBinary	true	Controls whether the local binary should be auto-detected from PATH environment variable. If set to false, the binary in <helmExecutableDirectory> is used only. This property has no effect unless <useLocalHelmBinary> is set to true.
<helmExecutableDirectory>	string	helm.executableDirectory	false	directory of your helm installation (default: ${project.build.directory}/helm). If defined, directory is used also for <autoDetectLocalHelmBinary> as a last resort.
<outputDirectory>	string	helm.outputDirectory	false	chart output directory (default: ${project.build.directory}/helm/repo)
<debug>	boolean	helm.debug	false	add debug to helm
<registryConfig>	string	helm.registryConfig	false	path to the registry config file
<repositoryCache>	string	helm.repositoryCache	false	path to the file containing cached repository indexes
<repositoryConfig>	string	helm.repositoryConfig	false	path to the file containing repository names and URLs
<repositoryAddForceUpdate>	boolean	helm.repo.add.force-update	false	If true, replaces (overwrite) the repo if they already exists.
<helmExtraRepos>	list of HelmRepository		false	adds extra repositories while init
<uploadRepoStable>	HelmRepository		false	Upload repository for stable charts
<uploadRepoSnapshot>	HelmRepository		false	Upload repository for snapshot charts (determined by version postfix 'SNAPSHOT')
<lintStrict>	boolean	helm.lint.strict	false	run lint command with strict option (fail on lint warnings)
<lintQuiet>	boolean	helm.lint.quiet	false	run lint command with quiet option (print only warnings and errors)
<addDefaultRepo>	boolean	helm.init.add-default-repo	true	If true, stable repo (https://charts.helm.sh/stable) will be added
<addUploadRepos>	boolean	helm.init.add-upload-repos	false	If true, upload repos (uploadRepoStable, uploadRepoSnapshot) will be added, if configured
<skip>	boolean	helm.skip	false	skip plugin execution
<skipInit>	boolean	helm.init.skip	false	skip init goal
<skipLint>	boolean	helm.lint.skip	false	skip lint goal
<skipTemplate>	boolean	helm.template.skip	false	skip template goal. Default value is true due to the dry-run goal
<skipDryRun>	boolean	helm.dry-run.skip	false	skip dry-run goal
<skipDependencyBuild>	boolean	helm.dependency-build.skip	false	skip dependency-build goal
<skipDependencyUpdate>	boolean	helm.dependency-update.skip	false	skip dependency-update goal
<skipPackage>	boolean	helm.package.skip	false	skip package goal
<skipUpload>	boolean	helm.upload.skip	false	skip upload goal
<insecure>	boolean	helm.upload.insecure	false	Skip tls certificate checks for the chart upload.
<skipInstall>	boolean	helm.install.skip	false	skip install goal
<skipUninstall>	boolean	helm.uninstall.skip	false	skip uninstall goal
<security>	string	helm.security	false	path to your settings-security.xml (default: ~/.m2/settings-security.xml)
<keyring>	string	helm.package.keyring	false	path to gpg secret keyring for signing
<key>	string	helm.package.key	false	name of gpg key in keyring
<passphrase>	string	helm.package.passphrase	false	passphrase for gpg key (requires helm 3.4 or newer)
<skipPushLogin>	boolean	helm.push.skipPushLogin	false	Skip login, usefull if already logged via helm:registry-login
<values>	ValueOverride		false	override some values for linting with helm.values.overrides (--set option), helm.values.stringOverrides (--set-string option), helm.values.fileOverrides (--set-file option) and last but not least helm.values.yamlFile (--values option)
<namespace>	string	helm.namespace	false	namespace scope for helm command
<kubeApiServer>	string	helm.kubeApiServer	false	the address and the port for the Kubernetes API server
<kubeInsecure>	string	helm.kubeInsecure	false	Skip tls certificate checks for the operation. Also known as helm --kube-insecure-skip-tls-verify.
<kubeAsUser>	string	helm.kubeAsUser	false	username to impersonate for the operation
<kubeAsGroup>	string	helm.kubeAsGroup	false	group to impersonate for the operation, this flag can be repeated to specify multiple groups
<kubeToken>	string	helm.kubeToken	false	bearer token used for authentication
<releaseName>	string	helm.releaseName	false	Name of the release for upgrade goal
<installForce>	boolean	helm.install.force	false	Force resource updates through a replacement strategy.
<installAtomic>	boolean	helm.install.atomic	false	Set this to true to delete the installation on failure.
<installTimeout>	boolean	helm.upgrade.imeout	false	Time in seconds to wait for any individual Kubernetes operation during install process. The default is 300 seconds (from helm) if installAtomic is set to true.
<upgradeForce>	boolean	helm.upgrade.force	false	Force resource updates through a replacement strategy.
<upgradeAtomic>	boolean	helm.upgrade.atomic	false	Set this to true to rollback changes made in case of failed upgrade.
<upgradeTimeout>	boolean	helm.upgrade.imeout	false	Time in seconds to wait for any individual Kubernetes operation during upgrade process. The default is 300 seconds (from helm) if upgradeTimeout is set to true.
<upgradeDryRun>	boolean	helm.upgrade.dryRun	false	Run upgrade goal only in dry run mode
<uninstallWait>	boolean	helm.uninstall.wait	false	If set, will wait until all the resources are deleted before returning. It will wait for as long as uninstallTimeout.
<uninstallTimeout>	boolean	helm.uninstall.timeout	false	Time to wait for any individual Kubernetes operation (like Jobs for hooks) (default 5m0s).
<uninstallNoHooks>	boolean	helm.uninstall.no-hooks	false	Prevent hooks from running during uninstallation.
<uninstallCascade>	boolean	helm.uninstall.cascade	false	Must be "background", "orphan", or "foreground". Selects the deletion cascading strategy for the dependents. Defaults to background. (default "background" from helm)
<uninstallKeepHistory>	boolean	helm.uninstall.keep-history	false	Remove all associated resources and mark the release as deleted, but retain the release history.
<templateOutputDir>	file	helm.template.output-dir	false	Writes the executed templates to files in output-dir instead of stdout.
<templateGenerateName>	boolean	helm.template.generate-name	false	Generate the name (and omit the NAME parameter).
<caFile>	boolean	helm.push.caFile	false	Verify certificates of HTTPS-enabled servers using this CA bundle.
<insecure>	boolean	helm.push.insecure	false	Skip tls certificate checks for the chart upload. Also known as helm push --insecure-skip-tls-verify
<fallbackBinaryDownload>	boolean	helm.fallbackBinaryDownload	false	Controls whether a download should occur when local helm binary is not found. This property has no effect unless <useLocalHelmBinary> is set to true.
<overwriteLocalDependencies>	boolean	helm.overwriteLocalDependencies	false	Controls whether a local path chart should be used for a chart dependency. When set to true, chart dependencies on a local path chart will be overwritten with the respective properties set by overwriteDependencyVersion and overwriteDependencyRepository. This is helpful for deploying charts with intra repository dependencies, while still being able to use local path dependencies for development builds. Example usage: for development use mvn clean install and for deployment use mvn clean deploy -Dhelm.overwriteLocalDependencies=true
<overwriteDependencyVersion>	string	helm.overwriteDependencyVersion	false	Value used to overwrite a local path chart's version within a chart's dependencies. The property overwriteLocalDependencies must be set to true for this to apply.
<overwriteDependencyRepository>	string	helm.overwriteDependencyRepository	false	Value used to overwrite a local path chart's repository within a chart's dependencies. The property overwriteLocalDependencies must be set to true for this to apply.

Packaging with the Helm Lifecycle

To keep your pom files small you can use 'helm' packaging. This binds helm:init to the initialize phase, helm:dependency-build to the process-resources phase, helm:lint to the test phase,helm:package to the package phase and helm:upload to the deploy phase.

<pom>
  <artifactId>my-helm-charts</artifactId>
  <version>0.0.1</version>
  <packaging>helm</packaging>
  ...
  <build>
    <plugins>
      <plugin>
        <groupId>io.kokuwa.maven</groupId>
        <artifactId>helm-maven-plugin</artifactId>
        <!-- Mandatory when you use a custom lifecycle -->
        <extensions>true</extensions>
        <configuration>
          ...
        </configuration>
      </plugin>
    </plugins>
    ....
  </build>
</pom>