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Development

Note: Please take a look at https://fluxcd.io/contributing/flux/ to find out about how to contribute to Flux and how to interact with the Flux Development team.

Installing required dependencies

There are a number of dependencies required to be able to run the controller and its test suite locally:

The following dependencies are also used by some of the make targets:

  • controller-gen (v0.7.0)
  • gen-crd-api-reference-docs (v0.3.0)
  • setup-envtest (latest)

If any of the above dependencies are not present on your system, the first invocation of a make target that requires them will install them.

How to run the test suite

Prerequisites:

  • Go >= 1.20

You can run the test suite by simply doing

make test

How to run the controller locally

Install the controller's CRDs on your test cluster:

make install

Note that image-automation-controller depends on source-controller to acquire its artifacts and image-reflector-controller to access container image metadata. Ensure that they are both running on your test cluster prior to running the image-automation-controller.

Run the controller locally:

make run

How to install the controller

Building the container image

Set the name of the container image to be created from the source code. This will be used when building, pushing and referring to the image on YAML files:

export IMG=registry-path/kustomize-controller
export TAG=latest

Build and push the container image, tagging it as $(IMG):$(TAG):

BUILD_ARGS=--push make docker-build

Note: make docker-build will build images for the amd64,arm64 and arm/v7 architectures.

If you get the following error when building the docker container:

Multiple platforms feature is currently not supported for docker driver.
Please switch to a different driver (eg. "docker buildx create --use")

you may need to create and switch to a new builder that supports multiple platforms:

docker buildx create --use

Deploying into a cluster

Deploy image-automation-controller into the cluster that is configured in the local kubeconfig file (i.e. ~/.kube/config):

make deploy

Debugging controller with VSCode

Create a .vscode/launch.json file:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch Package",
            "type": "go",
            "request": "launch",
            "mode": "auto",
            "program": "${workspaceFolder}/main.go"
        }
    ]
}

Start debugging by either clicking Run > Start Debugging or using the relevant shortcut.