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halide / build_bot

Buildbot configuration for Halide build bots
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Python environment

To get started setting up either a worker or a master, install Python 3.6+, python3-pip, and python3-venv, then create a virtual environment and install our Python dependencies:

$ python3 -m venv venv
$ . venv/bin/activate
$ pip install -r requirements.txt

Master configuration

Web server settings

Using your production-quality web server of choice (Apache, Nginx, etc.), choose a URL at which to host the master. Call this BUILDBOT_WWW. Then, set up a reverse proxy for the buildbot webserver (on port 8012). For Apache, your configuration might look like:

ProxyPass /ws ws://localhost:8012/ws
ProxyPassReverse /ws ws://localhost:8012/ws
ProxyPass / http://localhost:8012/
ProxyPassReverse / http://localhost:8012/

SetEnvIf X-Url-Scheme https HTTPS=1
ProxyPreserveHost On

Note that you will need to enable proxy_wstunnel for this to work (via a2enmod). It is essential that HTTPS only is used (to protect)

Close port 8012 to the internet. If you can't have port 9990 open, redirect another port to it. Whichever port this is, call it MASTER_PORT.

Make a note of your master's IP address. Call this MASTER_ADDR.

Secrets

Four secrets control authentication with external users and servers. These will need to be determined before starting up a new master.

  1. Obtain a GitHub personal access token with at least the repo scope enabled ( other scopes that are not currently used but might be later are write:packages and delete:packages). Call this GITHUB_TOKEN.
  2. Generate a secret for the workers to authenticate with the master. Call this WORKER_SECRET.
  3. Generate a secret to authenticate GitHub's webhook updates with the master. Call this WEBHOOK_SECRET.
  4. Choose a password for the halidenightly user to authenticate with the web interface. Call this WWW_PASSWORD.

A convenient command for generating a secure secret is openssl rand -hex 20.

GitHub Configuration

Make your way to the Webhooks section of your repository settings. The url is https://github.com/{owner}/{repo}/settings/hooks. The following settings are the correct ones:

  1. Payload URL: $BUILDBOT_WWW/change_hook/github
  2. Content type: application/json
  3. Secret: $WEBHOOK_SECRET
  4. SSL verification: Select Enable SSL verification
  5. Which events would you like to trigger this webhook? a. Let me select individual events.. Check "Pull requests" and "Pushes".

Starting the master

First, write all the secrets to the corresponding files:

$ echo "$GITHUB_TOKEN" > master/github_token.txt
$ echo "$WORKER_SECRET" > master/halide_bb_pass.txt
$ echo "$WEBHOOK_SECRET" > master/webhook_token.txt
$ echo "$WWW_PASSWORD" > master/buildbot_www_pass.txt

Then, create a database for the master to save its work. This only needs to be done once.

$ buildbot upgrade-master master

Choose a directory to hold artifacts for package runs:

$ export HALIDE_BB_MASTER_ARTIFACTS_DIR=/srv/www/buildbot/public_html/artifacts

Finally, start the master!

$ buildbot start master

Worker configuration

Worker dependencies

Windows

TODO: vcpkg?

Ubuntu

TODO: What is the apt package list to install?

macOS

Use homebrew to install other dependencies. You want at least:

$ brew install ccache libpng libjpeg cmake ninja doxygen

For macOS and Linux, once ccache is installed, it's helpful to configure it like so:

$ ccache --set-config=sloppiness=pch_defines,time_macros
$ ccache -M 100G  # or smaller, depending on disk size

The first command allows CCache to work in the presence of precompiled headers. The second sets the cache size to something very large (100GB in this case).

Starting a worker

The master recognizes workers by their reported names, eg. linux-worker-4 or win-worker-1. To launch the buildbot daemon on the worker named $WORKER_NAME, run the following commands after setting up the Python environment as detailed above:

$ echo "$WORKER_SECRET" > worker/halide_bb_pass.txt
$ export HALIDE_BB_WORKER_NAME=$WORKER_NAME  # required
$ export HALIDE_BB_MASTER_ADDR=$MASTER_ADDR  # default = public Halide master
$ export HALIDE_BB_MASTER_PORT=$MASTER_PORT  # default = 9990
$ buildbot-worker start worker