Rockcraft Build Plugins

Builds Ubuntu ROCK image for your application using Gradle or Maven. The plugin requires rockcraft installed.

How it works

The build plugins generate rockcraft.yaml in the output directory and build a rock image for your application.

The plugins provide tasks/goals to build and deploy rock image.

The parts generated are prefixed with a build system name, e.g. gradle or maven. The plugins create the following parts in rockcraft.yaml:

• <build-system>/rockcraft/runtime: e.g. maven/rockcraft/runtime or gradle/rockcraft/runtime. This part generates a Java runtime image for the application using jlink. The part finds all jar files in the target image /jars directory and generates a runtime image deployed in the /usr/jvm/java-<version>-openjdk-<arch>/ directory. It creates a symlink to java executable in /usr/bin/java.
• <build-system>/rockcraft/deps: deploys openjdk runtime dependencies.
• <build-system>/rockcraft/dump: copies build artifact into target image's /jars directory.

The rock is built using the base bare image.

The generated rockraft.yaml can be overridden by providing rockcraftYaml configuration property to the plugin. The plugin merges the generated rockcraft.yaml and the override one.

Configuration Options

Name	Description
buildPackage	OpenJDK Ubuntu package used to create a runtime image, e.g. openjdk-21-jdk-headless
targetRelease	--multi-release option passed to jlink
summary	rock image summary, e.g. Spring Boot Application
description	path to the description file, e.g. README.md
command	command used for the startup service
source	Git URL of chisel-releases repository
branch	Git branch of chisel-releases repository
architectures	list of the supported architectures, e.g. amd64, arm64
slices	list of additional chisel slices to install
rockcraftYaml	path to rockcraft.yaml with the overrides for the generated rockraft.yaml
createService	create startup service (default true)

Gradle Plugin

Getting started

Install rockcraft: snap install rockcraft.

To use the plugin, apply the following two steps:

1. Apply the plugin

Using the plugins DSL:

Groovy

plugins {
    id 'io.github.rockcrafters.rockcraft' version '0.2.2'
}

Kotlin

plugins {
    id("io.github.rockcrafters.rockcraft") version "0.2.2"
}

Alternatively, you can use the buildscript DSL:

Groovy

buildscript {
    repositories {
        maven {
            url "https://plugins.gradle.org/m2/"
        }
    }
    dependencies {
        classpath 'io.github.rockcrafters.rockcraft:0.2.2'
    }
}
apply plugin: 'io.github.rockcrafters.rockcraft-plugin'

Kotlin

buildscript {
    repositories {
        maven {
            setUrl("https://plugins.gradle.org/m2/")
        }
    }
    dependencies {
        classpath("io.github.rockcrafters.rockcraft:0.2.2")
    }
}
apply(plugin = "io.github.rockcrafters.rockcraft")

2. Configure the container

The plugin allows setting up container summary and description, target architectures and the startup service command line.

Groovy

rockcraft {
    buildPackage = 'openjdk-21-jdk'
    targetRelease = 21
    summary = 'A ROCK summary'
    description = 'README.md'
    command = '/usr/bin/java -jar jars/application.jar'
    source = 'http://github.com/myuser/chisel-releases'
    branch = 'my-chisel-release-branch'
    slices = ['busybox_bins', 'fontconfig_config']
    architectures = ['amd64', 'arm64']
    createService = false
    rockcraftYaml = 'rockcraft.yaml'
}

Kotlin

rockcraft {
    buildPackage = "openjdk-21-jdk"
    targetRelease = 21
    summary = "A ROCK summary"
    description = "README.md"
    command = "/usr/bin/java -jar jars/application.jar"
    source = "http://github.com/myuser/chisel-releases"
    branch = "my-chisel-release-branch"
    slices("busybox_bins", "fontconfig_config")
    architectures("amd64", "arm64")
    createService = false
    rockcraftYaml =  "rockcraft.yaml"
}

Examples

Please see examples to try the sample projects.

Maven Plugin

Getting started

Install rockcraft: snap install rockcraft.

To use the plugin, apply the following two steps:

1. Apply the plugin

Apply the plugin:

    <build>
        <plugins>
            ...
            <plugin>
                <groupId>io.github.rockcrafters</groupId>
                <artifactId>rockcraft-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <!-- creates rockcraft.yaml -->
                            <goal>create-rock</goal>
                            <!-- builds rock image -->
                            <goal>build-rock</goal>
                            <!-- pushes rock to the local docker daemon-->
                            <goal>push-rock</goal>
                        </goals>
                    </execution>
                </executions>
            <plugin>
        </plugins>
    <build>

2. Configure the container

The plugin supports all configuration options.

        <plugins>
            <plugin>
                <groupId>io.github.rockcrafters</groupId>
                <artifactId>rockcraft-maven-plugin</artifactId>
                ...
                <configuration>
                    <buildPackage>openjdk-17-jdk-headless</buildPackage>
                    <targetRelease>17</targetRelease>
                    <jlink>false</jlink>
                    <summary>foo</summary>
                    <description>readme.txt</description>
                    <source>https://github.com/canonical/chisel-releases</source>
                    <branch>ubuntu-24.04</branch>
                    <architectures>
                        <architecture>amd64</architecture>
                        <architecture>arm64</architecture>
                    </architectures>
                    <slices>
                        <slice>busybox_bins</slice>
                        <slice>dash_bins</slice>
                    </slices>
                </configuration>
            </plugin>

Examples

Please see examples to try the sample projects.

Issues and Contributions

Issues can be reported to the Issue tracker.

Contributions can be submitted via Pull requests,

TODO

• Error handling (empty jar file), no main class