TEP-0056: Pipelines in Pipelines

Summary

Pipelines in Pipelines (PinP) allows users to define and execute Pipelines within Pipelines, alongside Tasks and Custom Tasks. A PipelineTask can reference a child Pipeline using pipelineRef or embed one using pipelineSpec. The child Pipeline is executed as a child PipelineRun owned by the parent.

Scope

Features required for beta readiness per TEP-0056:

• Ground work and PipelineSpec (API types, validation, embedded pipeline execution)
• PipelineRef (reference by name or via resolvers, cycle detection)
• Results propagation from child Pipelines (including When expression support)
• Execution status for Finally Tasks
• Timeout propagation to child PipelineRuns
• Fine-grained timeout overrides for child PipelineRuns via pipelineRunSpecs
• Retries for PipelineTasks with Pipelines
• Matrix fan-out of PipelineRef
• Workspace validation at parent PipelineRun
• ServiceAccount propagation test coverage

Resources

• TEP-0056: Pipelines in Pipelines