# Release Process

Lens releases are built by CICD automatically on git tags. The typical release process flow is the following:

1. It is recommended to perform the release process from a folder used solely meant for creating releases (i.e. not your dev folder), with the Lens repo initialized (origin set to https://github.com/lensapp/lens).

1. If doing a patch release checkout the `release/vMAJOR.MINOR` branch for the appropriate `MAJOR`/`MINOR` version and manually `cherry-pick` the PRs required for the patch that were commited to master. If there are any conflicts they must be resolved manually. If necessary, get assistance from the PR authors.

This can be helped (if you have the `gh` CLI installed) by running:
```
gh api -XGET "/repos/lensapp/lens/pulls?state=closed&per_page=100" | jq -r '[.[] | select(.milestone.title == "<VERSION>") | select((.merged_at | type) == "string")] | sort_by(.merged_at) | map(.merge_commit_sha) | join(" ")'
```

But you will probably need to verify that all the PRs have correct milestones.

1. From a clean and up to date `master` (or `release/vMAJOR.MINOR` if doing a patch release) run `npm version <version-type> --git-tag-version false` where `<version-type>` is one of the following:
    - `major`
    - `minor`
    - `patch`
    - `premajor [--preid=<prerelease-id>]`
    - `preminor [--preid=<prerelease-id>]`
    - `prepatch [--preid=<prerelease-id>]`
    - `prerelease [--preid=<prerelease-id>]`

      where `<prerelease-id>` is generally one of:
        - `alpha`
        - `beta`
        - `rc`

    This assumes origin is set to https://github.com/lensapp/lens.git. If not then set GIT_REMOTE to the remote that is set to https://github.com/lensapp/lens.git. For example run `GIT_REMOTE=upstream npm version ...`
1. Open the PR (git should have printed a link to GitHub in the console) with the contents of all the accepted PRs since the last release. The PR description needs to be filled with the draft release description. From https://github.com/lensapp/lens click on Releases, the draft release should be first in the list, click `Edit` and copy/paste the markdown to the PR description. Add the `skip-changelog` label and click `Create Pull Request`. If this is a patch release be sure to set the PR base branch to `release/vMAJOR.MINOR` instead of `master`.

    It might also help, if the release drafter isn't updating correctly. To grab the data for the PR description using `gh` and `jq`. You can run the following command to get all the titles:

    ```
    gh api -XGET "/repos/lensapp/lens/pulls?state=closed&per_page=100" | jq -r '[.[] | select(.milestone.title == "<VERSION>") | select((.merged_at | type) == "string")] | sort_by(.merged_at) | map([.title, " (**#", .number, "**) ", .user.html_url] | join ("")) | join("\n")' | pbcopy
    ```

    And if you want to specify just bug fixes then you can add the following to the end of the `[ ... ]` section in the above command (before the `sort_by`) to just have bug fixes. Switch to `== "enhancement"` for enhancements and `all()` with `. != "bug && . != "enhancement"` for maintanence sections.

    ```
    | select(any(.labels | map(.name)[]; . == "bug"))
    ```

1. After the PR is accepted and passes CI (and before merging), go to the same branch and run `make tag-release` (set GIT_REMOTE if necessary). This additionally triggers the azure jobs to build the binaries and put them on S3.
1. If the CI fails at this stage the problem needs to be fixed. Sometimes an azure job fails due to outside service issues (e.g. Apple signing occasionally fails), in which case the specific azure job can be rerun from https://dev.azure.com/lensapp/lensapp/_build. Otherwise changes to the codebase may need to be done and committed to the release branch and pushed to https://github.com/lensapp/lens. CI will run again. As well the release tag needs to be manually set to this new commit. You can do something like:
    - `git push origin :refs/tags/vX.Y.Z-beta.N` (removes the tag from https://github.com/lensapp/lens)
    - `git tag -fa vX.Y.Z-beta.N` (move the tag locally to the current commit)
    - `git push origin --tags` (update the tags on https://github.com/lensapp/lens to reflect this local change)

    Once the tag has been updated on origin (e.g. by `git push origin --tags`) the azure jobs are automatically triggered again.

1. Once CI passes again go to the releases tab on GitHub. You can use the existing draft release prepared by k8slens-bot (select the correct tag). Or you can create a new release from the tag that was created, and make sure that the change log is the same as that of the PR, and the title is the tag. Either way, click the prerelease checkbox if this is not a new major, minor, or patch version before clicking `Publish release`.
1. Merge the release PR after the release is published. If it is a patch release then there is no need to squash the cherry-picked commits as part of the merge. GitHub should delete the branch once it is merged.
1. If you have just released a new major or minor version then create a new `release/vMAJOR.MINOR` branch from that same tag and push it to https://github.com/lensapp/lens. Given the commit of the merged release PR from the master branch you can do this like

    `git push origin <commit>:refs/heads/release/vX.Y`

    This will be the target for future patch releases and shouldn't be deleted.

Other tasks
 post release:
 - generate a changelog from the prerelease descriptions (for major/minor releases)
 - announce the release on lens and lens-hq slack channels (release is announced automatically on the community slack lens channel through the above publishing process)
 - announce on lens-hq that master is open for PR merges for the next release (for major/minor releases)
 - update issues on github (bump those that did not make it into the release to a subsequent release) (for major/minor/patch releases)
