P4-REQ-21-12-009

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Phase 0 SHALL include a prerequisite-checking script or equivalent controlled procedure.

Part 4, Section 21.12: Script and Execution Requirements.

Generation, build preparation, and execution depend on a valid environment containing required tools, directories, dependencies, configuration, and repository conventions.

A prerequisite check prevents downstream procedures from treating an incomplete or incompatible environment as a valid Phase 0 implementation baseline.

This requirement applies to:

• Phase 0 development environments;
• required tooling;
• repository structure;
• DDS and IDL tooling;
• Python dependencies; and
• applicable configuration and environment variables.

Verification SHALL confirm that Phase 0 includes a prerequisite-checking script or equivalent controlled procedure.

Verification activities should include review checks confirming that:

• required tools are checked;
• required repository locations are checked;
• applicable configuration is checked;
• required runtime dependencies are checked; and
• failed prerequisites prevent uncontrolled downstream execution.

This requirement establishes the controlled environment-validation step preceding applicable Phase 0 generation and execution activities.

Related requirement identifiers:

• P4-REQ-21-12-001
• P4-REQ-21-12-003
• P4-REQ-21-12-010

Related source section:

• 21.12 Script and Execution Requirements

Draft