external-snapshotter/README.md

csi-release-tools

These build and test rules can be shared between different Go projects without modifications. Customization for the different projects happen in the top-level Makefile.

The rules include support for building and pushing Docker images, with the following features:

• one or more command and image per project
• push canary and/or tagged release images
• automatically derive the image tag(s) from repo tags
• the source code revision is stored in a "revision" image label
• never overwrites an existing release image

Usage

The expected repository layout is:

• cmd/*/*.go - source code for each command
• cmd/*/Dockerfile - docker file for each command or Dockerfile in the root when only building a single command
• Makefile - includes release-tools/build.make and sets configuration variables
• .travis.yml - a symlink to release-tools/.travis.yml

To create a release, tag a certain revision with a name that starts with v, for example v1.0.0, then make push while that commit is checked out.

It does not matter on which branch that revision exists, i.e. it is possible to create releases directly from master. A release branch can still be created for maintenance releases later if needed.

Release branches are expected to be named release-x.y for releases x.y.z. Building from such a branch creates x.y-canary images. Building from master creates the main canary image.

Sharing and updating

git subtree is the recommended way of maintaining a copy of the rules inside the release-tools directory of a project. This way, it is possible to make changes also locally, test them and then push them back to the shared repository at a later time.

Cheat sheet:

• git subtree add --prefix=release-tools https://github.com/kubernetes-csi/csi-release-tools.git master - add release tools to a repo which does not have them yet (only once)
• git subtree pull --prefix=release-tools https://github.com/kubernetes-csi/csi-release-tools.git master - update local copy to latest upstream (whenever upstream changes)
• edit, git commit, git subtree push --prefix=release-tools git@github.com:<user>/csi-release-tools.git <my-new-or-existing-branch> - push to a new branch before submitting a PR

verify-shellcheck.sh

The verify-shellcheck.sh script in this repo is a stripped down copy of the corresponding script in the Kubernetes repository. It can be used to check for certain errors shell scripts, like missing quotation marks. The default test-shellcheck target in build.make only checks the scripts in this directory. Components can add more directories to TEST_SHELLCHECK_DIRS to check also other scripts.

End-to-end testing

A repo that wants to opt into testing via Prow must set up a top-level .prow.sh. Typically that will source prow.sh and then transfer control to it:

#! /bin/bash -e

. release-tools/prow.sh
main

All Kubernetes-CSI repos are expected to switch to Prow. For details on what is enabled in Prow, see https://github.com/kubernetes/test-infra/tree/master/config/jobs/kubernetes-csi

Test results for periodic jobs are visible in https://testgrid.k8s.io/sig-storage-csi

It is possible to reproduce the Prow testing locally on a suitable machine:

• Linux host
• Docker installed
• code to be tested checkout out in $GOPATH/src/<import path>
• cd $GOPATH/src/<import path> && ./.prow.sh

Beware that the script intentionally doesn't clean up after itself and modifies the content of $GOPATH, in particular the kubernetes and kind repositories there. Better run it in an empty, disposable $GOPATH.

When it terminates, the following command can be used to get access to the Kubernetes cluster that was brought up for testing (assuming that this step succeeded):

export KUBECONFIG="$(kind get kubeconfig-path --name="csi-prow")"

It is possible to control the execution via environment variables. See prow.sh for details. Particularly useful is testing against different Kubernetes releases:

CSI_PROW_KUBERNETES_VERSION=1.13.3 ./.prow.sh
CSI_PROW_KUBERNETES_VERSION=latest ./.prow.sh