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TestGrid Components

The cmd directory contains the main files for TestGrid components, and documentation for how to run them. For specifics on a particular component, see the subdirectory for that component.

Tips for running locally

Google Cloud Storage (GCS) Authentication

If you're using files from GCS and you hit an authentication or 'unauthorized' error in logs, run: gcloud auth application-default login

Most components will automatically find and use the credentials generated from this.

Common Flags

Most components have similar flags and defaults. Here's a few you can expect to use:

  • Run bazelisk run //cmd/$COMPONENT -- --help for full flag list and descriptions.
  • --config specifies the path to a valid [config proto]. It can take a:
    • local file: e.g. /tmp/testgrid/my-config.pb
    • GCS (Google Cloud Storage) file: e.g. gs://my-bucket/my-config.pb
  • --confirm, if true, writes data to the same base path as your --config.
    • Without this, it's "dry-run` by default and doesn't write data anywhere.
  • --wait, if true, runs the component continuously until force-quit, waiting the specified time before beginning another cycle.
    • Without this, it will run once and exit.
  • --debug or --trace print debug-level or trace-level logs, respectively.
    • Without this, only logs at info-level or higher will be displayed.
    • Debug logs tend to be useful for development or debugging.
    • Trace logs can be very noisy, and tend to be useful for debugging something very specific.

Developing and Testing

Most of the TestGrid libraries used for these components live under the pkg/ directory.

  • e.g. cmd/updater library code is under pkg/updater

To run unit tests for a particular component, run:

COMPONENT={component} # e.g. 'updater', 'summarizer', etc. 
bazelisk test //cmd/$COMPONENT/... # Runs unit tests for the main/binary, like flag-parsing or default arguments
bazelisk test //pkg/$COMPONENT/... # Runs unit tests for library code