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= Gerrit Code Review - Continuous Integration

[[summary]]
== TL;DR

All the Gerrit incoming changes and stable branches are built on the
link:https://gerrit-ci.gerritforge.com[Gerrit CI].

The link:https://gerrit.googlesource.com/gerrit-ci-scripts[gerrit-ci-scripts]
project contains all the YAML files definitions associated with the
link:https://docs.openstack.org/infra/jenkins-job-builder/attic/[Jenkins Job Builder]
definition of the continuous integration Jobs.

Gerrit maintainers are responsible for making sure that the CI jobs are
up-to-date by triggering the
link:https://gerrit-ci.gerritforge.com/job/gerrit-ci-scripts/[Gerrit-CI scripts job]
upon new commits to the master branch of the gerrit-ci-scripts project.

[[sign-up]]
== Signing up as maintainer on Gerrit-CI

The link:https://gerrit-ci.gerritforge.com/job/gerrit-ci-scripts/[Gerrit-CI]
controller allows the Gerrit maintainers to sign-in using their GitHub
accounts and have their username defined in the list of Users.

*****
NOTE: Because of recent link:https://docs.google.com/document/d/1vDjunjDrLYYpVoVON-B_c83f56Nhm-lMDMjXmYmFYk4[security issues]
      found on Jenkins and future potential risks, only the Gerrit
      maintainers and contributors are allowed to access the Jenkins UI and
      sign-up for creating an account.
*****

Once the sign-up phase is complete, the maintainer needs to grant
himself permissions on Jenkins by creating a change to add their names into
the Jenkins
link:https://gerrit.googlesource.com/gerrit-ci-scripts/+/refs/heads/master/jenkins-docker/server/config-external.xml#11[config.xml]
in the permissions XML Section.

== Applying changes to Jenkins on Gerrit-CI

The Jenkins setup link:https://gerrit-ci.gerritforge.com[Gerrit-CI] adopts
a link:https://www.ncsc.gov.uk/collection/zero-trust-architecture[Zero-Trust-Architecture]
and therefore assumes that any access could be potentially malicious.

- To limit the impact of future attacks or zero-days vulnerabilities the controller
  must not have any meaningful secret or key which could be stolen.
- It must not be possible for anyone to change anything on the Gerrit-CI
  infrastructure without authenticating with their credentials.
- No credentials should be stored anywhere on the Jenkins controller.
- Everything should be coming from the link:https://gerrit.googlesource.com/gerrit-ci-scripts[gerrit-ci-scripts] project
  and the infrastructure must be immutable and ephemeral.

Gerrit maintainers can apply the latest changes on the Jenkins controller on Gerrit-CI by performing the following
actions:

- Generate a personal API account token by authenticating to
  link:https://gerrit-ci.gerritforge.com/user/lucamilanesio/configure[Gerrit CI user's settings]
  and generating a new API token.
- Trigger the link:https://gerrit-ci.gerritforge.com/job/gerrit-ci-scripts/build?delay=0sec[gerrit-ci-scripts] job
  entering their GitHub username and their API account token