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building-locally.md

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Building locally

All projects in this repo follow a common building (and updating) process. Make targets are standardized across the repo. Projects can be built on a Mac or Linux host, as well as using the builder-base docker image used in prow for building.

Pre-requisites for building on host

  • Multiple versions of golang are required to build the various projects. There is a helper script modeled from the builder-base to install all golang versions locally.
  • If intending on generating checksums or attribution files, patch versions of golang must match. Validate versions in above script match those in builder-base. If not, please send a PR updating script in this repo.
  • Gathering licenses and generating attribution files requires additional setup outlined here.
  • For building container images, buildctl is used instead of docker to match our prow builds. Running local-images targets will export images to a tar, but if running images targets which push images, a registry is required. By default, an ECR repo in the currently logged in AWS account will be used. A common alternative is to run docker registry locally and override this default behavior. This can be done with IMAGE_REPO=localhost:5000 make images. To run buildkit and the docker registry run from the repo root:
    • make run-buildkit-and-registry
    • export BUILDKIT_HOST=docker-container://buildkitd
    • make stop-build-and-registry to cleanup

Typical build targets

Each project folder contains a Makefile with the following build targets. A number of projects container multiple release-branches based on Kubernetes version. When working with these projects and running any of the following targets, you can override the default with RELEASE_BRANCH<1-X> make <target>.

  • binaries - clones repo, checks out git tag and builds binaries.
  • local-images - builds container images and writes to /tmp/{project}.tar.
  • images - builds container images and pushes to configured registry. For a few projects (coredns, etcd, kubernetes) local oci tars are also built to be uploaded to s3.
  • gather-licenses - copies licenses from all project dependencies and puts in _output/LICENSES to be included in tarballs and container images.
  • attribution - regenerate the ATTRIBUTION.txt file, golang versions are important here so make sure you have the same versions as the builder-base. There is a periodic job which runs every day to keep these up to date, builds will not fail due to these not being 100% accurate.
  • checksums - update CHECKSUMS file based on currently built binaries. Builds should be reproducible across Mac and Linux hosts. This should be run when bumping GIT_TAG, changing patches or changing build flags, otherwise should not be changed. Builds will fail if these do not match, but the correct checksums will be outputted to make updating easier.
  • build - run via prow presubmit, clones repo, build binary(s), gather licenses, build container images, build tarballs and generate attribution file. Uses local-images to build images which does not push to a registry.
  • release - run via prow postsubmit, same as build except runs images to push to a remote registry and upload-artifacts to push tars/binaries to s3.

Running in builder-base

It may be easier to ensure building matches that in prow to use the builder-base locally. There are make target helpers in the root Makefile for this workflow.

  • To run a target within a specific project:
    • make run-target-in-docker MAKE_TARGET=<target> PROJECT=<project> RELEASE_BRANCH=<1-X>
    • any of the above targets can be used for <target>
    • <project> will be in the format org/repo, ex: coredns/coredns
    • A container is launched using the builder-base:latest image and the current source tree is copied into it. If also building locally, you may want to run make clean to avoid copying unnecessary files into the container.
    • The container will be named eks-d-builder and can be accessed to manually run targets or cleanup:
      • docker exec -it eks-d-builder bash
    • Subsequent calls to make run-target-in-docker will use the same running container. To stop the container:
      • make stop-docker-builder
  • Attribution and Checksum generation may be easier to run in docker to avoid needing specific golang versions locally. A specific make target exists for these:
    • make update-attribution-checksums-docker PROJECT=<project> RELEASE_BRANCH=<1-X>
    • This will build, generate attribution and checksums and then copy the resulting files out of the container to host project location.