Repository on Micha Kops' Tech Notes

Downloading Maven Artifacts from a POM file programmatically with Eclipse Aether

Fri, 08 Sep 2017 00:00:00 +0200

Sometimes I need to resolve Maven dependencies programmatically. Eclipse Aether is a library for working with artifact repositories and I’ll be using it in the following example to read dependency trees from a given POM descriptor file and download each dependency from a remote Maven repository to a local directory.

Figure 1. Using Eclipse Aether.

Dependencies

We’re adding a bunch of dependencies to our project’s pom.xml:

<properties>
    <aetherVersion>1.1.0</aetherVersion>
    <mavenVersion>3.2.1</mavenVersion>
</properties>

How to add a local lib directory to Maven

Thu, 18 Mar 2010 00:00:00 +0100

Sometimes there is a dependency not available at a remote repository and one is too lazy to set up a local maven repository – that’s when one adds a directory in the project structure and wants maven to find dependencies there.

Create a directory called “lib” in the project root

Add the following markup to the pom.xml inside the <repositories>-Tag (create if it does not exist):

<repository>
    <id>lib</id>
    <name>lib</name>
    <releases>
        <enabled>true</enabled>
        <checksumPolicy>ignore</checksumPolicy>
    </releases>
    <snapshots>
        <enabled>false</enabled>
    </snapshots>
    <url>file://${project.basedir}/lib</url>
</repository>

GitHub Snippets

Mon, 01 Mar 2010 00:00:00 +0100

GitHub Actions

Step to check variables and redistribute as env

The following step does ..

check of given variables are set, if not, exit with an error that is visible in the action’s log
provide the given input as environment variable in GITHUB_ENV

- name: configuration
      env:
        VAR1: ${{ needs.configure.outputs.something }}
        VAR2: ${{ vars.SOMETHING_OTHER }}/
        VAR3: "something_other_other"
      run: |
        for var in VAR1 VAR2 VAR3; do [ -n "${!var}" ] || { echo "$var is missing"; exit 1; }; echo "$var=${!var}" >> "$GITHUB_ENV"; done

Helm Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Common operations

Add Helm Repository

helm repo add NAME URL

e.g. for the Bitnami repository:

helm repo add bitnami https://charts.bitnami.com/bitnami                                                                                                                                                         1 ↵
"bitnami" has been added to your repositories

List Repositories

helm repo list                                                                                                                                                                                                 130 ↵
NAME    URL
bitnami https://charts.bitnami.com/bitnami

Searching in a Helm Repository

helm search repo wordpress
NAME                    CHART VERSION   APP VERSION     DESCRIPTION
bitnami/wordpress       15.2.30         6.1.1           WordPress is the world's most popular blogging ...
bitnami/wordpress-intel 2.1.31          6.1.1           DEPRECATED WordPress for Intel is the most popu...