beforeScript

The beforeScript directive executes a custom (Bash) snippet before the main process script is run. This may be useful to initialize the underlying cluster environment or for other custom initialization.

For example:

process hello {
    beforeScript 'source /cluster/bin/setup'

    script:
    """
    echo 'hello'
    """
}

When the process is containerized (using the container directive), the beforeScript is executed in the container only if the executor is container-native (e.g. cloud batch executors, Kubernetes). Otherwise, the beforeScript is executed outside the container.