use Buildpacks to build function images from source code

[tpiperatgod]

What's the Buildpacks

please refer to this: https://buildpacks.io/docs/

Proposal

The tasks of the "buildpacks" in the above diagram are:

1. package or compile the source code to an artifact in the form of .jar/.nar/go binary/.py
2. use the function runner as the base image and place the artifact from step 1 in the specified location of the function runner
3. export the created OCI image to the specified registry

In this way, we can simplify the process of building function images.

Action items

In order to reach the goal, we need to accomplish the following three objectives.

create stack

Note

learn more about the stack: https://buildpacks.io/docs/concepts/components/stack/

The Build image can be a common operating system image, such as Ubuntu.

The Run image must be the function runner image, which contains the requirements for the function image.

create buildpacks

Note

learn more about the buildpack: https://buildpacks.io/docs/concepts/components/buildpack/

Building function images for different languages will require a varying number of buildpacks.

create builder

Note

learn more about the builder: https://buildpacks.io/docs/concepts/components/builder/

We need to make builder based on stack and buildpacks, which will be repeatedly used to build function images for the same programming language.

[jiangpengcheng]

what does the function yaml in the diagram mean?

[tpiperatgod]

I think it can be ignored since the user can build a function image through pulsarctl directly.

[hpvd]

maybe its also interesting for parts of this topic to look into the idea of distroless images, its advantages and the latest tooling, just see #448

[tpiperatgod]

Yes, it is common usage in Buildpacks to use distroless images as the Run image for the Stack.

[hpvd]

Yes, it is common usage in Buildpacks to use distroless images as the Run image for the Stack.

hey that's interesting to hear!

was mentioning this, because in the issue you were writing:

The Build image can be a common operating system image, such as Ubuntu.

maybe it's an option to think about distroless for all images needed