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89 lines
3.6 KiB
Markdown
89 lines
3.6 KiB
Markdown
# Making a LinuxKit release
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This document describes the steps to make a LinuxKit release. A
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LinuxKit release consists of:
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- A git tag of the form vX.Y on a specific commit.
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- Packages on Docker hub, tagged with the release tag.
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- All sample `YAML` files updated to use the release packages
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- `linuxkit` binaries for all supported architectures.
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- Changelog entry
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Note, we explicitly do not tag kernel images with LinuxKit release
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tags as we encourage users to stay current with the kernel
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releases. We also do not tag test and `mkimage` packages as these are
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not end-user facing.
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## Pre-requisites
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Releases can be done by any maintainer. Maintainers need to have
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access to build machines for all architectures support by LinuxKit and
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signing keys set up to sign Docker hub images.
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## Release preparation
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The release preparation is by far the most time consuming task as it
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involves updating all packages and YAML files.
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The release preparation is performed on a branch of your up-to-date
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LinuxKit clone. This document assumes that your clone of the LinuxKit
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repository is available as the `origin` remote in your local `git`
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clone (in my setup the official LinuxKit repository is available as
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`upstream` remote). If your setup is different, you may have to adjust
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some of the commands below.
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As a starting point you have to be on the update to date master branch
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and be in the root directory of your local git clone. You should also
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have the same setup on all build machines used.
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### Update `linuxkit/alpine`
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This step is not necessarily required if the alpine base image has
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recently been updated, but it is good to pick up any recent bug
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fixes. Follow the process in [alpine-base-update.md](./alpine-base-update.md)
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There are several important notes to consider when updating alpine base:
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* `LK_BRANCH` is set to `rel_$LK_RELEASE`, when cutting a release, for e.g. `LK_BRANCH=rel_v0.9`
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* It not necessarily required to update the alpine base image if it has recently been updated, but it is good to pick up any recent bug
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fixes. However, you do need to update the tools, packages and tests.
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* Releases are a particularly good time to check for updates in wrapped external dependencies, as highlighted in [alpine-base-update.md#External Tools](./alpine-base-update.md#External_Tools)
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### Final preparation steps
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- Update AUTHORS by running `./scripts/generate-authors.sh`
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- Update the `VERSION` variable in the top-level `Makefile`
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- Create an entry in `CHANGELOG.md`. Take a look at `git log v0.3..HEAD` and pick interesting updates (of course adjust `v0.3` to the previous version).
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- Create a PR with your changes.
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## Releasing
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Once the PR is merged we can do the actual release.
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- Update your local git clone to the lastest
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- Identify the merge commit for your PR and tag it and push it to the main LinuxKit repository (remote `upstream` in my case):
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```
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git tag $LK_RELEASE master
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git push upstream $LK_RELEASE
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```
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Then head over to GitHub and look at the `Releases` tab. You should see the new tag. Edit it:
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- Add the changelog message
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- Head over to the Circle CI page of the master build (try the Circle CI badge in the top level `README.md`)
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- Download the artefacts and SHA256 sums file.
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- Add the downloaded binaries to the release page (drag-and-drop below the editor window)
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- Add the `sha256` sums to the release notes on the release page
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Hit the `Publish release` button.
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This completes the release, but you are not done, one more step is required.
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## Post release
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Create a PR which bumps the version number in the top-level `Makefile`
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to `$LK_RELEASE+` to make sure that the version reported by `linuxkit
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version` gets updated.
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