= Making a Gerrit Release

[NOTE]
This document is meant primarily for Gerrit maintainers
who have been given approval and submit status to the Gerrit
projects.  Additionally, maintainers should be given owner
status to the Gerrit web site.

To make a Gerrit release involves a great deal of complex
tasks and it is easy to miss a step so this document should
hopefully serve as both a how to for those new to the process
and as a checklist for those already familiar with these
tasks.

== Gerrit Release Type

Here are some guidelines on release approaches depending on the
type of release you want to make (`stable-fix`, `stable`, `rc0`,
`rc1`...).

[[stable]]
=== Stable

A `stable` release is generally built from the `master` branch and may
need to undergo some stabilization before releasing the final release.

* Propose the release with any plans/objectives to the mailing list.

* Release plans usually become a
  link:https://www.gerritcodereview.com/news.html[news article]
  to be followed up with.

* Create a Gerrit `rc0`.

* If needed create Gerrit `rc1`, `rc2` and `rc3` (one per week, on Mondays
  or so; see link:https://www.gerritcodereview.com/news.html[past release plans]).

[NOTE]
You may let in a few features to these releases.

* If needed create a Gerrit `rc4`.

[NOTE]
There should be no new features in this release, only bug fixes.

* Finally create the `stable` release (no `rc`).

=== Stable-Fix

`stable-fix` releases should likely only contain bug fixes and doc
updates.

* Propose the release with any plans/objectives to the mailing list.

* This type of release does not need any RCs, release when the
objectives are met.

[[security]]
=== Security-Fix

`security-fix` releases should only contain bug fixes for security
issues.

For security issues it is important that they are only announced
*after* fixed versions for all relevant releases have been published.
Because of this, `security-fix` releases can't be prepared in the public
`gerrit` project.

`security-fix` releases are prepared in the `gerrit-security-fixes`
project which is only readable by the Gerrit Maintainers. Only after
a `security-fix` release has been published will the commits/tags made in
the `gerrit-security-fixes` project be taken over into the public
`gerrit` project.

[[upload-final-release-notes]]
== Upload the final Release Notes change

Upload a change on the homepage project to:

* Remove 'In Development' caveat from the relevant section.

* Add links to the released documentation and the .war file, and make the
latest version bold.

The uploaded change is not to be approved yet, but rather act as the
release content review thread until it can be finalized.

[[update-links]]
=== Update homepage links

Upload a change on the link:https://gerrit-review.googlesource.com/admin/repos/homepage[
homepage project] to change the version numbers to the new version.

[[update-issues]]
=== Update the Issues

Update the issues by hand. There is no script for this.

Our current process is an issue should be updated to say `Status =
Submitted, FixedIn-$version` once the change is submitted, but before the
release.

The updated issues are the ones listed in commit messages since the
previous version tag. Mention each updated issue in the uploaded change,
following the examples from the previous version notes. Add updated issue
owners as reviewers of the uploaded change. More reviewers can be added
or cc'ed, to further coordinate the final release contents.

Similarly to issues, also mention every noteworthy change done after the
previous release. Again, previous notes should be used as template examples.

You may need to split note update changes from the final change that
updates the links. This allows non-final update changes to be reviewed and
submitted timely. The final (links) change may take more time to complete,
as this underlying release process unfolds.

== Create the Actual Release

[[update-versions]]
=== Update Versions and Create Release Tag

Before doing the release build, the `GERRIT_VERSION` in the `version.bzl`
file must be updated, e.g. change it from `$version-SNAPSHOT` to `$version`.

In addition the version must be updated in a number of `*_pom.xml` files.

To do this run the `./tools/version.py` script and provide the new
version as parameter, e.g.:

----
  version=2.15
  ./tools/version.py $version
----

Commit the changes and create a signed release tag on the new commit:

----
  git tag -s -m "v$version" "v$version"
----

If unable to tag, make sure that git is locally
link:https://medium.com/@rwbutler/signing-commits-using-gpg-on-macos-7210362d15[configured with your user's key].
These are the macOS instructions but such commands should be portable enough.
Setting `GPG_TTY` this way or similar might also be necessary:

----
  export GPG_TTY=$(tty)
----

Tag the plugins:

----
  git submodule foreach '[ "$path" == "modules/jgit" ] || git tag -s -m "v$version" "v$version"'
----

[[build-gerrit]]
=== Build Gerrit

* Build the Gerrit WAR, API JARs and documentation:
+
----
  bazel build release Documentation:searchfree
  ./tools/maven/api.sh war_install
  ./tools/maven/api.sh install
----

* Verify the WAR version:
+
----
  java -jar bazel-bin/release.war --version
----

* Try upgrading a test site and launching the daemon.

* Verify the plugin versions:
+
----
  java -jar bazel-bin/release.war init --list-plugins
----

[[publish-gerrit]]
=== Publish the Gerrit Release

[[publish-to-maven-central]]
==== Publish the Gerrit artifacts to Maven Central

* Make sure you have done the
link:dev-release-deploy-config.html#deploy-configuration-setting-maven-central[
configuration] for deploying to Maven Central.

* Make sure that the version is updated in the `version.bzl` file and in
the `*_pom.xml` files as described in the link:#update-versions[Update
Versions and Create Release Tag] section.

* Push the WAR to Maven Central:
+
----
  ./tools/maven/api.sh war_deploy
----

* Push the plugin artifacts to Maven Central:
+
----
  ./tools/maven/api.sh deploy
----

* To where the artifacts are uploaded depends on the `GERRIT_VERSION` in
the `version.bzl` file:

** SNAPSHOT versions are directly uploaded into the Sonatype snapshots
repository and no further action is needed:
+
https://oss.sonatype.org/content/repositories/snapshots/com/google/gerrit/

** Release versions are uploaded into a staging repository in the
link:https://oss.sonatype.org/[Sonatype Nexus Server].

* Verify the staging repository

** Go to the link:https://oss.sonatype.org/[Sonatype Nexus Server] and
sign in with your Sonatype credentials.

** Click on 'Build Promotion' in the left navigation bar under
'Staging Repositories' and find the `comgooglegerrit-XXXX` staging
repository.

** Verify its content
+
While the staging repository is open you can upload further content and
also replace uploaded artifacts. If something is wrong with the staging
repository you can drop it by selecting it and clicking on `Drop`.

** Run Sonatype validations on the staging repository
+
Select the staging repository and click on `Close`. This runs the
Sonatype validations on the staging repository. The repository will
only be closed if everything is OK. A closed repository cannot be
modified anymore, but you may still drop it if you find any issues.

** Test closed staging repository
+
Once a repository is closed you can find the URL to it in the `Summary`
section, e.g. https://oss.sonatype.org/content/repositories/comgooglegerrit-1029.
+
Use this URL for further testing of the artifacts in this repository,
e.g. to try building a plugin against the plugin API in this repository
update the version in the `*_pom.xml` and configure the repository:
+
----
  <repositories>
    <repository>
      <id>gerrit-staging-repository</id>
      <url>https://oss.sonatype.org/content/repositories/comgooglegerrit-1029</url>
    </repository>
  </repositories>
----

* Release the staging repository
+
How to release a staging repository is described in the
link:https://docs.sonatype.org/display/Repository/Sonatype+OSS+Maven+Repository+Usage+Guide#SonatypeOSSMavenRepositoryUsageGuide-8.a.2.ReleasingaStagingRepository[
Sonatype OSS Maven Repository Usage Guide].
+
[WARNING]
Releasing artifacts to Maven Central cannot be undone!

** Find the closed staging repository in the
link:https://oss.sonatype.org/[Sonatype Nexus Server], select it and
click on `Release`.

** The released artifacts are available in
https://oss.sonatype.org/content/repositories/releases/com/google/gerrit/.

** It may take up to 2 hours until the artifacts appear on Maven
Central:
+
https://repo1.maven.org/maven2/com/google/gerrit/

* [optional]: View download statistics

** Sign in to the
link:https://oss.sonatype.org/[Sonatype Nexus Server].

** Click on 'Views/Repositories' in the left navigation bar under
'Central Statistics'.

** Select `com.google.gerrit` as `Project`.

[[publish-to-google-storage]]
==== Publish the Gerrit WAR to the Google Cloud Storage

* Go to the link:https://console.cloud.google.com/storage/browser/gerrit-releases/?project=api-project-164060093628[
gerrit-releases bucket in the Google cloud storage console].

* Make sure you are signed in with your Gmail account.

* Manually upload the Gerrit WAR file by using the `Upload` button.

[[push-stable]]
==== Push the Stable Branch

* Create the stable branch `stable-$version` in the `gerrit` project via the
link:https://gerrit-review.googlesource.com/admin/repos/gerrit,branches[
Gerrit Web UI] or by push.

* Push the commits done on `stable-$version` to `refs/for/stable-$version` and
get them merged.

* Create a change updating the `defaultbranch` field in the `.gitreview`
to match the branch name created.

[[push-tag]]
==== Push the Release Tag

Push the new Release Tag:

----
  git push gerrit-review tag v$version
----

Push the new Release Tag on the plugins:

----
  git submodule foreach git push gerrit-review tag v$version
----

[[upload-documentation]]
==== Upload the Documentation

* Extract the documentation files from the zip file generated from
`bazel build searchfree`: `bazel-bin/Documentation/searchfree.zip`.

* Upload the files manually via web browser to the appropriate folder
in the
link:https://console.cloud.google.com/storage/browser/gerrit-documentation/?project=api-project-164060093628[
gerrit-documentation] storage bucket.

[[finalize-release-notes]]
=== Finalize the Release Notes

Submit any previously uploaded notes change on the homepage project.

[[finalize-issues]]
==== Update the Issues

After the release is actually made, you can search (in Monorail) for
`Status=Submitted FixedIn=$version` and then batch update these changes
to say `Status=Released`. Make sure the pulldown says `All Issues`
because `Status=Submitted` is considered a closed issue.

[[announce]]
==== Announce on Mailing List

Send an email to the mailing list to announce the release. The content of the
announcement email is generated with the `release-announcement.py` script from
the gerrit-release-tools repository, which automatically includes all the
necessary links, hash values, and wraps the text in a PGP signature.

For details refer to the documentation in the script's header, and/or the
help text:

----
  ~/gerrit-release-tools/release-announcement.py --help
----

[[increase-version]]
=== Increase Gerrit Version for Current Development

All new development that is done in the `master` branch will be included in the
next Gerrit release. The Gerrit version should be set to the snapshot version
for the next release.

Use the `version` tool to set the version in the `version.bzl` file:

----
  ./tools/version.py 2.6-SNAPSHOT
----

Verify that the changes made by the tool are sane, then commit them, push
the change for review on the master branch, and get it merged.

[[merge-stable]]
=== Merge `stable` into `master`

After every release, stable should be merged to master to ensure that
none of the changes/fixes ever get lost.

----
  git config merge.summary true
  git checkout master
  git reset --hard origin/master
  git branch -f stable origin/stable
  git merge stable
----

[[update-api-version-in-bazlets-repository]]

Bazlets is used by gerrit plugins to simplify build process. To allow the
new released version to be used by gerrit plugins,
link:https://gerrit.googlesource.com/bazlets/+/master/gerrit_api.bzl#8[gerrit_api.bzl]
must reference the new version. Upload a change to bazlets repository with
api version upgrade.

[[clean-up-on-master]]
=== Clean up on master

Once you are done with the release, check if there are any code changes in the
master branch that were gated on the next release. Mostly, these are
feature-deprecations that we were holding off on to have a stable release where
the feature is still contained, but marked as deprecated.

See link:dev-processes.html#deprecating-features[Deprecating features] for
details.

GERRIT
------
Part of link:index.html[Gerrit Code Review]

SEARCHBOX
---------