License	License The Apache License, Version 2.0
Categories	Categories Quarkus Container Microservices Gradle Build Tools
GroupId	GroupId com.google.cloud.tools
ArtifactId	ArtifactId jib-quarkus-extension-gradle
Last Version	Last Version 0.1.1
Release Date	Release Date Aug 26, 2020
Type	Type pom.sha512
Description	Description Quarkus Extension for Jib Gradle Plugin Allows building images for Quarkus projects.
Project URL	Project URL https://github.com/GoogleContainerTools/jib-extensions
Source Code Management	Source Code Management https://github.com/GoogleContainerTools/jib-extensions

Filename	Size
jib-quarkus-extension-gradle-0.1.1.pom
jib-quarkus-extension-gradle-0.1.1-sources.jar	3 KB
jib-quarkus-extension-gradle-0.1.1-javadoc.jar	20 KB
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Jib Extensions

This repository contains extensions to the Jib Maven and Gradle build plugins.

The Jib Extension Framework enables anyone to easily extend and tailor the Jib plugins behavior to their liking. Jib extensions are supported from Jib Maven 2.3.0 and Jib Gradle 2.4.0.

1st-party extensions: extensions developed and maintained by the Jib team
3rd-party extensions: links to externally developed extensions

What Part of Jib Does the Extension Framework Allow to Tweak?

The Container Build Plan originally prepared by Jib plugins. The build plan describes in a declarative way how it plans to build a container image. If you are interested in writing an extension, see Updating Container Build Plan for more details.

Using Jib Plugin Extensions

Maven

Add extensions as dependencies to the Jib <plugin> block in pom.xml.
Specify extension implementation classes with <pluginExtensions> in Jib's <configuration>.

The following example adds and runs the Jib Layer-Filter Extension.

  <plugin>
    <groupId>com.google.cloud.tools</groupId>
    <artifactId>jib-maven-plugin</artifactId>
    <version>2.6.0</version>

    <!-- 1. have extension classes available on Jib's runtime classpath -->
    <dependencies>
      <dependency>
        <groupId>com.google.cloud.tools</groupId>
        <artifactId>jib-layer-filter-extension-maven</artifactId>
        <version>0.1.0</version>
      </dependency>
    </dependencies>

    <configuration>
      ...
      <pluginExtensions>
        <!-- 2. specify extension implementation classes to load -->
        <pluginExtension>
          <implementation>com.google.cloud.tools.jib.maven.extension.layerfilter.JibLayerFilterExtension</implementation>
        </pluginExtension>
      </pluginExtensions>
    </configuration>
  </plugin>

When properly configured and loaded, Jib outputs the loaded extensions in the log. When you configure multiple <pluginExtension>s, Jib runs the extensions in the given order.

[INFO] --- jib-maven-plugin:2.6.0:build (default-cli) @ helloworld ---
[INFO] Running extension: com.google.cloud.tools.jib.maven.extension.layerfilter.JibLayerFilterExtension

Some extensions may expect you to provide extension-specific user configuration.

For extensions that accept simple string properties (map), use <pluginExtension><properties>. For example,

<pluginExtension>
  <implementation>com.example.ExtensionAcceptingMapConfig</implementation>
  <properties>
    <customFlag>true</customFlag>
    <layerName>samples</layerName>
  </properties>
</pluginExtension>

For extensions that define a complex configuration, use <pluginExtension><configuration implementation=...> (not Jib's <configuration>). Note that the class for the implementation XML attribute should be the extension-supplied configuration class and not the main extension class. For example,

<pluginExtension>
  <implementation>com.google.cloud.tools.jib.maven.extension.layerfilter.JibLayerFilterExtension</implementation>
  <configuration implementation="com.google.cloud.tools.jib.maven.extension.layerfilter.Configuration">
    <filters>
      <filter>
        <glob>**/google-*.jar</glob>
        <toLayer>google libraries</toLayer>
      </filter>
      <filter>
        <glob>/app/libs/in-house-*.jar</glob>
        <toLayer>in-house dependencies</toLayer>
      </filter>
    </filters>
  </configuration>
</pluginExtension>

Gradle

Have extensions available to the build script (build.gradle) by adding them with buildscript.dependencies at the beginning of the build script.
Configure extension implementation classes with jib.pluginExtensions.

The following example adds and runs the Jib Layer-Filter Extension.

// should be at the top of build.gradle
buildscript {
  dependencies {
    classpath('com.google.cloud.tools:jib-layer-filter-extension-gradle:0.1.0')
  }
}

...

jib {
  ...
  pluginExtensions {
    pluginExtension {
      implementation = 'com.google.cloud.tools.jib.gradle.extension.layerfilter.JibLayerFilterExtension'
    }
  }
}

When properly configured and loaded, Jib outputs the loaded extensions in the log. When you configure multiple jib.pluginExtensions, Jib runs the extensions in the given order.

Running extension: com.google.cloud.tools.jib.gradle.extension.layerfilter.JibLayerFilterExtension

Some extensions may expect you to provide extension-specific user configuration.

For extensions that accept simple string properties (map), use pluginExtension.properties. For example,

pluginExtensions {
  pluginExtension {
    implementation = 'com.example.ExtensionAcceptingMapConfig'
    properties = [customFlag: 'true', layerName: 'samples']
  }
}

For extensions that define a complex configuration, use pluginExtension.configuration. For example,

Groovy

pluginExtension {
  implementation = 'com.google.cloud.tools.jib.gradle.extension.layerfilter.JibLayerFilterExtension'
  configuration {
    filters {
      filter {
        glob = '**/google-*.jar'
        toLayer = 'google libraries'
      }
      filter {
        glob = '/app/libs/in-house-*.jar'
        toLayer = 'in-house dependencies'
      }
    }
  }
}

Kotlin

pluginExtension {
  implementation = "com.google.cloud.tools.jib.gradle.extension.layerfilter.JibLayerFilterExtension"
  configuration(Action<com.google.cloud.tools.jib.gradle.extension.layerfilter.Configuration> {
    filters {
      filter {
        glob = "**/google-*.jar"
        toLayer = "google libraries"
      }
      filter {
        glob = "/app/libs/in-house-*.jar"
        toLayer = "in-house dependencies"
      }
    }
  })
}

Writing Your Own Extensions

It is easy to write an extension! If you have written a useful extension, let us know and we will put a link in this repo under third-party/. Or, consider contributing to this repo. Either way, Jib users will greatly appreciate it!

Project Setup

Create a new Java project and add Jib Maven/Gradle Plugin Extension API to the project dependencies.
- Maven: jib-maven-plugin-extension-api with <scope>provided.
```
<dependencies>
   <dependency>
     <groupId>com.google.cloud.tools</groupId>
     <artifactId>jib-maven-plugin-extension-api</artifactId>
     <version>0.4.0</version>
     <scope>provided</scope>
   </dependency>
</dependencies>
```
- Gradle: jib-gradle-plugin-extension-api using compileOnly. Also apply java-gradle-plugin (as the Extension API allows you to access the Gradle project being containerized via Gradle API); if your extension does access the Gradle project via Gradle API, ideally you should use a Gradle version that is compatible with what the Jib plugin uses at image building time. (See Version Matrix.)
```
plugins {
  id 'java-gradle-plugin'
  ...
}

dependencies {
  compileOnly 'com.google.cloud.tools:jib-gradle-plugin-extension-api:0.4.0'
}
```
Add a text file src/main/resources/META-INF/services/com.google.cloud.tools.jib.maven.extension.JibMavenPluginExtension (Maven) / src/main/resources/META-INF/services/com.google.cloud.tools.jib.gradle.extension.JibGradlePluginExtension (Gradle) and list your classes that implements the Jib Maven/Gradle Plugin Extension API below. See the Maven and Gradle examples.
Implement JibMavenPluginExtension (Maven) / JibGradlePluginExtension (Gradle).

Updating Container Build Plan

The extension API passes in ContainerBuildPlan, which is the container build plan originally prepared by Jib plugins. The build plan describes in a declarative way how it plans to build a container image.

The class is a Java API for Container Build Plan Specification. The Container Build Plan Specification is a general specification independent of Jib. Likewise, the Container Build Plan Java API is a light-weight, standalone API implementing the spec published to Maven Central (jib-build-plan. The Build Plan classes, once instantiated, are all stateless, immutable "value classes" (holding only simple values). You can inspect the values using simple getters, and when you want to "modify" values, use toBuilder() to create new instances.

Defining Extension-Specific Configuration

Sometimes, you may want to make your extension configurable by the extension end-users. See #using-jib-plugin-extensions to understand how end-users can provide extra configuration to an extension.

Simple string properties (map): the Extension API has a built-in support for end-users passing simple string map. If your extension does not need complex configuration structure, prefer this approach.
Complex configuration structure: define your configuration class and have getExtraConfigType() return the class. See the Maven and Gradle examples.
- Gradle-specific: your configuration class must have a 1-arg constructor accepting a Gradle Project.

Version Matrix

jib-maven-plugin	jib-maven-plugin-extension-api
2.5.0 - current	0.4.0
2.3.0 - 2.4.0	0.3.0

jib-gradle-plugin	jib-gradle-plugin-extension-api	Jib Plugin Runtime Gradle API*
2.5.0 - current	0.4.0	5.2.1
2.4.0	0.3.0	5.2.1

* For example, it is recommended to use Gradle 5.2.1 or only use the API available in 5.2.1 to develop an extension for Jib Gradle 2.5.0.

Quarkus Extension for Jib Gradle Plugin

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