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nextflow/docs/developer/nextflow.container.md

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+
+# `nextflow.container`
+
+The `nextflow.container` package implements the integration with container runtimes.
+
+## Class Diagram
+
+```{mermaid} diagrams/nextflow.container.mmd
+```
+
+```{note}
+Some classes may be excluded from the above diagram for brevity.
+```
+
+## Notes
+
+The `ContainerBuilder` class is the base class for all container runtimes supported by Nextflow. It produces the container wrapper command for a given task run.
+
+Executors that support containerized tasks insert this wrapper command into the task wrapper script (`.command.run`). Executors that are *container-native*, i.e. that launch the task wrapper itself inside a container, don't need to generate a container wrapper command.