Root POM for ABSA OSS repos

The root POM defines a set of profiles and properties that implement conventions on how the ABSA OSS Maven based projects are built, released, published, checked for license or otherwise treated in the CI/CD pipelines.

The profiles are designed to cover independent concerns, so they can be used separately or combined in a single Maven run.

Profiles should be activated using conditional approach by specifying -D argument. (Don't use -P)

Example:

mvn ... -Dmy-profile

Setup

Configure your project POM

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>za.co.absa</groupId>
        <artifactId>root-pom</artifactId>
        <version>x.y.z</version>
    </parent>

    <scm>
        <url>${scm.url}</url>
        <connection>${scm.connection}</connection>
        <developerConnection>${scm.developerConnection}</developerConnection>
        <tag>HEAD</tag>
    </scm>

</project>

Usage

Create a project release

The release is done with the help of standard Maven release plugin configured in the release profile. (We only use release:prepare goal, never release:perform that is substituted with other dedicated profiles).

mvn release:prepare -Drelease -Dscm.developerConnection=scm:git:https://github.com/AbsaOSS/...

The SCM credentials can be set up either in the command line -Dusername=... -Dpassword=..., or via the <server> tag in the Maven settings.xml

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">

    <servers>
        <server>
            <id>absaoss-scm</id>
            <username>...</username>
            <password>...</password>
        </server>
    </servers>

</settings>

This will run all tests, create release/x.y.z tag, increment the development version and push everything into the given SCM repo

See Maven release plugin for details.

Check for license headers

Simply activate license-check profile on any Maven phase.

mvn validate -Dlicense-check

Measure code coverage

Simply activate code-coverage profile on verify Maven phase.

mvn verify -Dcode-coverage

See Maven RAT plugin

Deploy to OSSRH (Maven Central)

Configure OSSRH credentials and GPG passphrase in the Maven settings.xml

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">

    <servers>
        <server>
            <id>ossrh</id>
            <username>absaoss-ba</username>
            <password>...</password>
        </server>
        <server>
            <id>gpg.passphrase</id>
            <passphrase>...</passphrase>
        </server>
    </servers>

</settings>

Import a GPG key to sign the artifacts. If you have several keys imported, the default one will be used.

gpg --import ...

Then run Maven deploy phase with the ossrh profile enabled

mvn deploy -DskipTests -Dossrh

The staging repository will be released and closed automatically.

Build Docker images

Using the following template, create a Dockerfile in a module for which you want to build a Docker image

FROM base_docker_image_coordinates

# legal stuff
LABEL \
    vendor="ABSA" \
    copyright="2021 ABSA Group Limited" \
    license="Apache License, version 2.0"
    
# These arguments are propagated from the corresponding Maven properties.
# Uncomment what you need.
#
# ARG PROJECT_NAME
# ARG PROJECT_GROUP_ID
# ARG PROJECT_ARTIFACT_ID
# ARG PROJECT_VERSION
# ARG PROJECT_BASEDIR
# ARG PROJECT_BUILD_DIRECTORY
# ARG PROJECT_BUILD_FINAL_NAME    

# The rest of your Dockerfile here

In the corresponding pom.xml, specify the Docker image name and enable the dockerfile Maven plugin by setting the <skip> property to false

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <properties>
        <docker.imageName>my-docker-image</docker.imageName>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>io.fabric8</groupId>
                <artifactId>docker-maven-plugin</artifactId>
                <configuration>
                    <skip>false</skip>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

To build the Docker image execute Maven install phase with the docker profile enabled. You also need to specify the mandatory docker.repositoryUrl. It serves as the image name prefix, and is mandatory even if you don't want to push the image in any remote repo.

mvn install -Ddocker -Ddocker.repositoryUrl=foo

The above example will create a Docker image with the name foo/my-docker-image and two tags - latest and x.y.z (corresponding the POM version)

Push the image to a remote repository

Specify docker.repositoryUrl property accordingly and execute Maven deploy phase.

The example command below with create an image and push into the AbsaOSS space on the Docker Hub.

mvn deploy -Ddocker -Ddocker.repositoryUrl=docker.io/absaoss

Tweaking image names and tags

See the <docker.*> properties in the root pom.xml for details. All those parameters can be set/overwritten in the command line.

mvn ... -Dxxx.yyy=zzz

License

---

Copyright 2021 ABSA Group Limited

you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.