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This document describes how to add new CI jobs (utilizing ci-operator) for OpenShift components to the OpenShift CI system. In general, two steps are needed:

  1. Prepare configuration file, describing how ci-operator should build and test your component.
  2. Add new jobs to Prow, hooking ci-operator to important GitHub events for your repository.

This walkthrough covers a simple use case of hooking up a job running source code level tests (unit, performance etc.) on pull requests on a component repository. Although ci-operator can perform more sophisticated test steps than simply running unit tests, these use cases are beyond the scope of this doc.

Prepare configuration for component repo

The JSON configuration file describes how to build different images in a testing pipeline for your repository. ci-operator has different ”targets” that describe the goal images to build, and later targets build on successfully built earlier targets. You will probably want to write and test your config file locally first, and test whether it builds all targets and runs all tests as expected (you need to be logged in to a cluster, e.g. to api.ci):

./ci-operator --config config.yaml --git-ref openshift/<repo>@<revision>

After you make sure everything works, you need to create a subdirectory of ci-operator/config/openshift in the openshift/release repository for your component and put the config file there.

Source code image target

By default, ci-operator first builds a src target image that contains the source code of the component together with its build dependencies. The src image is used by later targets that perform binary builds, execute tests, etc. Using cloneref , ci-operator fetches the refs to be tested from the component repository and injects the source code into the base image specified by the build_root key. There are two ways to specify the base image:

  • From an image stream that should contain all build dependencies of the tested component, so it will often be a openshift/release:<tag> image.
build_root:
  image_stream_tag:
    cluster: https://api.ci.openshift.org
    namespace: openshift
    name: release
    tag: golang-1.10
  • From a Dockerfile that is in the repository in which the PR is opened. In this case, ci-operator will build the image first and it will get the build from the latest of the target branch.
build_root:
  project_image:
    dockerfile_path: Dockerfile
    context_dir: path/of/dockerfile/

Note: Both image_stream_tag and project_image should not be defined.

Given your component can be built in the context of the openshift/release image, you can test building the src target:

$ ./ci-operator --config example.yaml --git-ref=openshift/<component>@<revision> --target=src

Test targets

Test target images are built over earlier targets. The targets are specified in a tests array (so it is possible to specify multiple test targets). Here is an example of two test targets, each performing a different test by calling different make target in a src image (of course, a Makefile in your component repository would need to have these targets for this to work).

tests:
- as: unit
  commands: make test-unit
  container:
    from: src
- as: performance
  commands: make test-performance
  container:
    from: src

By default, ci-operator runs all specified test targets, building all their dependencies (and transitively, their dependencies) before. You can limit the execution to build just one or more targets using the --target option.

Intermediary binary targets

Two test targets in the previous example assume their make targets take care of full build from source till the actual test. This is often the case, but it is inefficient because each test target performs the build separately. CI operator can create bin and test-bin targets for the test targets to share by providing binary_build_commands and test_binary_build_commands respectively. Note that ci-operator allows separate bin and test-bin targets because often the compilation process is different for “normal” and test binaries, for example in Go you might want do compile in a different way to test for race conditions.

Here, unit and integration targets will both be built from a test-bin image, which will be a result of running make instrumented-build over a src image, while performance test target will be run from a bin image:

binary_build_commands: make build
test_binary_builds_commands: make instrumented-build
tests:
- as: unit
  commands: make test-unit
  container:
    from: test-bin
- as: integration
  commands: make test-integration
  container:
    from: test-bin
- as: performance
  commands: make test-performance
  container:
    from: bin

Using Separate Build Environment and Release Environment Images

Often, you will want to run your builds in an environment where all of your build- time dependencies exist, but you will not want those to be present in your final container image. For this case, ci-operator allows you to use a separate image for your builds and we make use of the OpenShift Build image source mechanism to deliver artifacts from one container image to another. In the following example, we configure ci-operator to run such a build:

base_images:
  release_base:
    name: release
    tag: latest
binary_build_commands: make build
images:
- context_dir: images/product
  from: release_base
  inputs:
    bin:
      paths:
      - destination_dir: usr/bin/binary
        source_path: path/to/binary
  to: product
build_root:
  image_stream_tag:
    name: tests
    tag: latest

In the example, we build the binaries using make build in the tests environment image and commit the result to the bin tag. Then, we build the product image using the release_base and copying in the binary from that bin tag.

Submit the configuration file to openshift/release

When you describe the targets for your component in the configuration file, you will need to add the file to the openshift/release repository, specifically to its ci-operator/config/openshift subdirectory tree. Each OpenShift component has a separate directory there, and there is a configuration file in it per branch of the repository under test (all files should be in the master branch of the openshift/release repository).

Images targets, end-to-end tests and more

Building the source code and running unit tests is basic use case for ci-operator. In addition to that, ci-operator is able to build component images, provision test clusters using them and run end-to-end tests on them. These use cases would use more features in both configuration file and Prow job and would not fit into this document. We will provide more documentation describing other use cases soon.

Add Prow jobs

Once the config file is prepared, you can create Prow jobs that will build selected targets before or after a PR is merged (or even periodically). Prow job configuration files also live in openshift/release repository, specifically in ci-operator/jobs/$org/$repo directories. The easiest way how to create them is to use the generator. The generator can create a good set of default Prow jobs from your ci-operator configuration file. All you need to do is to commit the generated files.

You can find more information about how to create Prow jobs in test-infra documentation.