ocf-230

OCF-230 – knative build with s2i (binary) and buildah (on any k8s)

Taking the opposite direction of OCF-196 (using openshift build/buildconfig), we want to be able to run a s2i build (using s2i binary and buildah) to build an image that can be later on used for a knative service.

This means:

• Create a builder image that can generate a Dockerfile from s2i
• Create a builder image that use buildah to build that Dockerfile (could be the same builder image)
• Provide a build-template (most likely upstream in https://github.com/knative/build-templates`) for that

Builders

This folder contains 2 builders:

• buildah-builder, that contains everything required for building dockerfiles without Docker, using buildah. It is auto-built on the hub : vdemeester/buildah-builder
• s2i-builder, that contains uses s2i a.k.a. source-to-image to generate a Dockerfile from a source file and a base image. It can be combined with buildah-builder. It is auto-built on the hub : vdemeester/s2i-builder

Knative templates

There is 2 templates too (that are or will be upstream in knative/build-templates) :

• buildah.template.yml, that uses the buildah-builder to build an image in knative.

  Example:

  apiVersion: build.knative.dev/v1alpha1
  kind: Build
  metadata:
    name: buildah-build-my-repo
  spec:
    timeout: 50m
    serviceAccountName: build-bot
    source:
      git:
        url: https://github.com/vdemeester/os-sample-python.git
        revision: dockerfile
    template:
      name: buildah
      arguments:
      - name: IMAGE
        value: vdemeester/my-app

• s2i.template.yml, that uses s2i-builder and buildah-builder to build an image, using s2i, in knative.

  Example:

  apiVersion: build.knative.dev/v1alpha1
  kind: Build
  metadata:
    name: s2i-build-my-repo
  spec:
    timeout: 50m
    serviceAccountName: build-bot
    source:
      git:
        url: https://github.com/vdemeester/os-sample-python
        revision: master
    template:
      name: s2i
      arguments:
      - name: BASE_IMAGE
        value: centos/python-36-centos7
      - name: IMAGE
        value: docker.io/vdemeester/helloworld-python