# Rundeck CLI - Extensions

Rundeck CLI can use extension jars to add additional functionality.

# Using Extensions

Download an extension jar, and place it in the RD_EXT_DIR directory.

By default for UNIX this is located at ~/.rd/ext, you can override the location in your ~/.rd/rd.conf file by adding:

export RD_EXT_DIR=/my/ext/dir

When you run rd, the extensions will be loaded and added as commands in the hierarchy of available subcommands.

You can check the list of loaded extensions by running rd with RD_DEBUG=1.

# Develop an Extension

Extensions can be developed as Java libraries.

# Dependencies

Add the rd-cli-lib dependency to your project.

Available in Maven Central.

Javadoc:

# Gradle example

A demo project can be seen here: https://github.com/gschueler/rd-extension-demo (opens new window)

//use maven central
repositories {
    mavenCentral()
}

dependencies {
    api "org.rundeck.cli:rd-cli-lib:{{site.app_version}}"
    api "org.rundeck.cli-toolbelt:toolbelt-jewelcli:0.2.28"
    implementation "org.rundeck.api:rd-api-client:{{site.app_version}}"

    implementation 'com.squareup.retrofit2:retrofit:2.7.1'
    implementation 'com.squareup.retrofit2:converter-jackson:2.7.1'
    implementation 'com.squareup.retrofit2:converter-jaxb:2.7.1'

}

# Implement `RdCommandExtension`

The following example adds the command rd sub path somecomand.

package com.mycompany;
import org.rundeck.client.tool.extension.RdCommandExtension;
import org.rundeck.client.tool.extension.RdTool;
import org.rundeck.client.util.Client;
import org.rundeck.client.util.ServiceClient;
import org.rundeck.toolbelt.Command;
import org.rundeck.toolbelt.CommandOutput;
import org.rundeck.toolbelt.SubCommand;

@SubCommand(path={"sub","path"})
class MyClass implements RdCommandExtension{
    RdTool rdTool;
    public void setRdTool(RdTool rdTool){
        this.rdTool=rdTool;
    }   

    @Command
    public boolean someCommand(CommandOutput out){
        out.output("running someCommand");
    }
}

Argument parsing is done with the CLI Toolbelt, and can use the JewelCLI or Picocli libraries. See the Example code.

# Declare the Service

The rd tool uses the Java ServiceLoader to load extensions on the classpath.

Declare your class in a file called META-INF/services/org.rundeck.client.tool.extension.RdCommandExtension

com.mycompany.MyClass

For a standard Gradle java library, create the file in src/main/resources/META-INF/services/org.rundeck.client.tool.extension.RdCommandExtension

← Change Log