Add support of package fontconfig on java buildpack

[ldominguezBold]

Hi, I have jhipster (spring boot) java project that use the Graphics2D stack of java to build a png image rendering a text inside it. I'm using the full stack paketobuildpacks/builder-jammy-base, i was searching a method to install into the final image this apt package but the only thing that i found is to create a custom stack with this. There is no way to add an additional build like the apt-buildpackage or some environment that add this specific package to the ubuntu run image?

[dmikusa]

For now, option 4.) here is the best choice.

https://stackoverflow.com/questions/69447497/is-it-possible-to-customize-docker-image-generated-with-spring-native-with-buil/69466535#69466535

It can be used to install additional packages. I haven't done this in a while, but you may need to point the JVM to the location into which the packages are installed. The apt-buildpack tries to set up env variables to make things discoverable, but it doesn't always work.

In the future, we'll be able to support this better through buildpack extensions. Those are not quite ready yet though.

[ldominguezBold]

thanks

[ldominguezBold]

But the thing with 4) is the add of this build-pack... I'm using this script to avoid to use docker on build (I'm on Gitlab CI with a runner inside kubernetes that dont use docker):

make_image:
  image: paketobuildpacks/builder-jammy-base
  stage: package 
  script:
    - mkdir ~/.docker
    - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_JOB_TOKEN\"}}}" >> ~/.docker/config.json
    - /cnb/lifecycle/creator -app=. $CI_REGISTRY_IMAGE:latest

how add this apt build-pack there?

[dmikusa]

You could create a custom builder that includes the additional buildpack. Get the file here modify it to include that buildpack and then pack builder create. The thing with this is that you then need some sort of CI/automation to keep doing that so your builder stays up-to-date.

The nice thing about pack is that it is dynamically doing this when you use the -b flag to pack build.

I don't know if there's a way to dynamically do that in your case. You could perhaps try to fetch the apt-buildpack and put it into the right directory.
Ex:

I've not tried this and I'm not sure if there would be other metadata that would require updating also. This is probably a better question for the upstream CNB team. https://buildpacks.io/community/

[ldominguezBold]

thanks, I will try this method.

[lmm1990]

@ldominguezBold Is that okay?Can you provide an example?