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+# Gerrit Deployment on Kubernetes
+
+Container images, configurations, [helm charts](https://helm.sh/) and a Kubernetes
+Operator for installing [Gerrit](https://www.gerritcodereview.com/) on
+[Kubernetes](https://kubernetes.io/).
+
+# Deploying Gerrit on Kubernetes
+
+This project provides helm-charts to install Gerrit either as a primary instance
+or a replica on Kubernetes.
+
+The helm-charts are located in the `./helm-charts`-directory. Currently, the
+charts are not published in a registry and have to be deployed from local sources.
+
+For a detailed guide of how to install the helm-charts refer to the respective
+READMEs in the helm-charts directories:
+
+- [gerrit](helm-charts/gerrit/README.md)
+- [gerrit-replica](helm-charts/gerrit-replica/README.md)
+
+These READMEs detail the prerequisites required by the charts as well as all
+configuration options currently provided by the charts.
+
+To evaluate and test the helm-charts, they can be installed on a local machine
+running Minikube. Follow this [guide](Documentation/minikube.md) to get a detailed
+description how to set up the Minikube cluster and install the charts.
+
+Alternatively, a Gerrit Operator can be used to install and operate Gerrit in a
+Kubernetes cluster. The [documentation](./Documentation/operator.md) describes
+how to build and deploy the Gerrit Operator and how to use it to install Gerrit.
+
+# Docker images
+
+This project provides the sources for docker images used by the helm-charts.
+The images are also provided on [Dockerhub](https://hub.docker.com/u/k8sgerrit).
+
+The project also provides scripts to build and publish the images so that custom
+versions can be used by the helm-charts. This requires however a docker registry
+that can be accessed from the Kubernetes cluster, on which Gerrit will be
+deployed. The functionality of the scripts is described in the following sub-
+sections.
+
+## Building images
+
+To build all images, the `build`-script in the root directory of the project can
+be used:
+
+```
+./build
+```
+
+If a specific image should be built, the image name can be specified as an argument.
+Multiple images can be specified at once:
+
+```
+./build gerrit git-gc
+```
+
+The build-script usually uses the `latest`-tag to tag the images. By using the
+`--tag TAG`-option, a custom tag can be defined:
+
+```
+./build --tag test
+```
+
+The version of Gerrit built into the images can be changed by providing a download
+URL for a `.war`-file containing Gerrit:
+
+```
+./build --gerrit-url https://example.com/gerrit.war
+```
+
+The version of a health-check plugin built into the images can be changed by
+providing a download URL for a `.jar`-file containing the plugin:
+
+```
+./build --healthcheck-jar-url https://example.com/healthcheck.jar
+```
+
+The build script will in addition tag the image with the output of
+`git describe --dirty`.
+
+The single component images inherit a base image. The `Dockerfile` for the base
+image can be found in the `./base`-directory. It will be
+automatically built by the `./build`-script. If the component images are built
+manually, the base image has to be built first with the target
+`base:latest`, since it is not available in a registry and thus has
+to exist locally.
+
+## Publishing images
+
+The publish script in the root directory of the project can be used to push the
+built images to the configured registry. To do so, log in first, before executing
+the script.
+
+```
+docker login <registry>
+```
+
+To configure the registry and image version, the respective values can be
+configured via env variables `REGISTRY` and `TAG`. In addition, these values can
+also be passed as command line options named `--registry` and `--tag` in which
+case they override the values from env variables:
+
+```
+./publish <component-name>
+```
+
+The `<component-name>` is one of: `apache-git-http-backend`, `git-gc`, `gerrit`
+or `gerrit-init`.
+
+Adding the `--update-latest`-flag will also update the images tagged `latest` in
+the repository:
+
+```
+./publish --update-latest <component-name>
+```
+
+## Running images in Docker
+
+The container images are meant to be used by the helm-charts provided in this
+project. The images are thus not designed to be used in a standalone setup. To
+run Gerrit on Docker use the
+[docker-gerrit](https://gerrit-review.googlesource.com/admin/repos/docker-gerrit)
+project.
+
+# Running tests
+
+The tests are implemented using Python and `pytest`. To ensure a well-defined
+test-environment, `pipenv` is meant to be used to install packages and provide a
+virtual environment in which to run the tests. To install pipenv, use `brew`:
+
+```sh
+brew install pipenv
+```
+
+More detailed information can be found in the
+[pipenv GitHub repo](https://github.com/pypa/pipenv).
+
+To create the virtual environment with all required packages, run:
+
+```sh
+pipenv install
+```
+
+To run all tests, execute:
+
+```sh
+pipenv run pytest -m "not smoke"
+```
+
+***note
+The `-m "not smoke"`-option excludes the smoke tests, which will fail, since
+no Gerrit-instance will be running, when they are executed.
+***
+
+Some tests will need to create files in a temporary directory. Some of these
+files will be mounted into docker containers by tests. For this to work make
+either sure that the system temporary directory is accessible by the Docker
+daemon or set the base temporary directory to a directory accessible by Docker
+by executing:
+
+```sh
+pipenv run pytest --basetemp=/tmp/k8sgerrit -m "not smoke"
+```
+
+By default the tests will build all images from scratch. This will greatly
+increase the time needed for testing. To use already existing container images,
+a tag can be provided as follows:
+
+```sh
+pipenv run pytest --tag=v0.1 -m "not smoke"
+```
+
+The tests will then use the existing images with the provided tag. If an image
+does not exist, it will still be built by the tests.
+
+By default the build of the container images will not use the build cache
+created by docker. To enable the cache, execute:
+
+```sh
+pipenv run pytest --build-cache -m "not smoke"
+```
+
+Slow tests may be marked with the decorator `@pytest.mark.slow`. These tests
+may then be skipped as follows:
+
+```sh
+pipenv run pytest --skip-slow -m "not smoke"
+```
+
+There are also other marks, allowing to select tests (refer to
+[this section](#test-marks)).
+
+To run specific tests, execute one of the following:
+
+```sh
+# Run all tests in a directory (including subdirectories)
+pipenv run pytest tests/container-images/base
+
+# Run all tests in a file
+pipenv run pytest tests/container-images/base/test_container_build_base.py
+
+# Run a specific test
+pipenv run \
+ pytest tests/container-images/base/test_container_build_base.py::test_build_base
+
+# Run tests with a specific marker
+pipenv run pytest -m "docker"
+```
+
+For a more detailed description of how to use `pytest`, refer to the
+[official documentation](https://docs.pytest.org/en/latest/contents.html).
+
+## Test marks
+
+### docker
+
+Marks tests which start up docker containers. These tests will interact with
+the containers by either using `docker exec` or sending HTTP-requests. Make
+sure that your system supports this kind of interaction.
+
+### incremental
+
+Marks test classes in which the contained test functions have to run
+incrementally.
+
+### integration
+
+Marks integration tests. These tests test interactions between containers,
+between outside clients and containers and between the components installed
+by a helm chart.
+
+### kubernetes
+
+Marks tests that require a Kubernetes cluster. These tests are used to test the
+functionality of the helm charts in this project and the interaction of the
+components installed by them. The cluster should not be used for other purposes
+to minimize unforeseen interactions.
+
+These tests require a storage class with ReadWriteMany access mode within the
+cluster. The name of the storage class has to be provided with the
+`--rwm-storageclass`-option (default: `shared-storage`).
+
+### slow
+
+Marks tests that need an above average time to run.
+
+### structure
+
+Marks structure tests. These tests are meant to test, whether certain components
+exist in a container. These tests ensure that components expected by the users
+of the container, e.g. the helm charts, are present in the containers.
+
+## Running smoke tests
+
+To run smoke tests, use the following command:
+
+```sh
+pipenv run pytest \
+ -m "smoke" \
+ --basetemp="<tmp-dir for tests>" \
+ --ingress-url="<Gerrit URL>" \
+ --gerrit-user="<Gerrit user>" \
+ --gerrit-pwd
+```
+
+The smoke tests require a Gerrit user that is allowed to create and delete
+projects. The username has to be given by `--gerit-user`. Setting the
+`--gerrit-pwd`-flag will cause a password prompt to enter the password of the
+Gerrit-user.
+
+# Contributing
+
+Contributions to this project are welcome. If you are new to the Gerrit workflow,
+refer to the [Gerrit-documentation](https://gerrit-review.googlesource.com/Documentation/intro-gerrit-walkthrough.html)
+for guidance on how to contribute changes.
+
+The contribution guidelines for this project can be found
+[here](Documentation/developer-guide.md).
+
+# Roadmap
+
+The roadmap of this project can be found [here](Documentation/roadmap.md).
+
+Feature requests can be made by pushing a change for the roadmap. This can also
+be done to announce/discuss features that you would like to provide.
+
+# Contact
+
+The [Gerrit Mailing List](https://groups.google.com/forum/#!forum/repo-discuss)
+can be used to post questions and comments on this project or Gerrit in general.