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Module 10: Migration, Governance, and Make Boundaries

Page Maps

graph LR
  family["Reproducible Research"]
  program["Deep Dive Make"]
  section["Migration Governance Tool Boundaries"]
  page["Module 10: Migration, Governance, and Make Boundaries"]
  capstone["Capstone evidence"]

  family --> program --> section --> page
  page -.applies in.-> capstone
flowchart LR
  orient["Orient on the page map"] --> read["Read the main claim and examples"]
  read --> inspect["Inspect the related code, proof, or capstone surface"]
  inspect --> verify["Run or review the verification path"]
  verify --> apply["Apply the idea back to the module and capstone"]

Module 10 is where the course stops asking, "Can you make this build work?" and starts asking, "Can you inherit it responsibly?"

That is a different skill. A mature build engineer needs to review a legacy Make system, separate design debt from broken truth, plan change without losing evidence, and say plainly when Make should remain the owner of a concern and when it should not.

This module is about stewardship:

  • reading a build as a long-lived product instead of a pile of commands
  • planning repairs in an order that preserves proof
  • defining rules future maintainers can actually follow
  • recognizing anti-patterns before they turn into team folklore
  • drawing honest tool boundaries instead of fashionable ones

What this module is for

By the end of Module 10, you should be able to explain five things clearly:

  • how to review a Make-based build without collapsing into style arguments
  • how to stage a migration so each move keeps the build auditable
  • what governance rules keep a build teachable and maintainable over time
  • which recurring build smells are worth stopping immediately
  • when Make is still the right owner and when another tool should take over

Study route

flowchart TD
  start["Overview"] --> core1["Reviewing Build Contracts and Current Truth"]
  core1 --> core2["Migration Plans That Preserve Proof"]
  core2 --> core3["Governance Rules for Long-Lived Builds"]
  core3 --> core4["Recurring Build Antipatterns and Recovery"]
  core4 --> core5["Deciding When Make Should Stop Owning the Problem"]
  core5 --> example["Worked Example: Planning a Safe Build Migration"]
  example --> practice["Exercises"]
  practice --> answers["Exercise Answers"]
  answers --> glossary["Glossary"]

Read the module in that order the first time. After that, jump directly to the page that matches the stewardship question in front of you.

The ten files in this module

  1. Overview (index.md)
  2. Reviewing Build Contracts and Current Truth
  3. Migration Plans That Preserve Proof
  4. Governance Rules for Long-Lived Builds
  5. Recurring Build Antipatterns and Recovery
  6. Deciding When Make Should Stop Owning the Problem
  7. Worked Example: Planning a Safe Build Migration
  8. Exercises
  9. Exercise Answers
  10. Glossary

How to use the file set

If you need to... Start here
review an inherited Makefile with discipline instead of taste-based debate Reviewing Build Contracts and Current Truth
change a build without losing your ability to prove it still works Migration Plans That Preserve Proof
define what future maintainers are allowed to change casually and what they are not Governance Rules for Long-Lived Builds
identify build patterns that repeatedly produce pain Recurring Build Antipatterns and Recovery
choose honestly between keeping responsibility in Make or moving it elsewhere Deciding When Make Should Stop Owning the Problem
see the whole module in one realistic migration narrative Worked Example: Planning a Safe Build Migration
pressure-test your own reasoning Exercises
compare your reasoning against a reference Exercise Answers
keep the module vocabulary stable Glossary

The running question

Carry this question through every page:

what evidence would let me improve this build while keeping trust in its current and future behavior?

Strong Module 10 answers usually mention one or more of these:

  • a review artifact that makes the present system legible
  • a migration step that changes one boundary at a time
  • a governance rule that protects public contracts and evidence surfaces
  • an anti-pattern described in terms of truth loss or ownership drift
  • a tool-boundary argument based on responsibility, not novelty

Commands to keep close

These commands form the review loop for Module 10:

make -n all
make --trace all
make -p > build/review.dump
make -j1 all
make -j8 all

The exact targets may change from repository to repository. The point is stable evidence: dry-run meaning, trace meaning, database meaning, and serial versus parallel behavior.

Learning outcomes

By the end of this module, you should be able to:

  • write an evidence-based review of a legacy Make build
  • stage a migration without discarding convergence, traceability, or comparison checks
  • define governance rules for public targets, includes, macros, and proof surfaces
  • recognize recurring build failures as patterns instead of one-off anecdotes
  • explain where Make should keep ownership and where it should hand off responsibility

Exit standard

Do not move on until all of these are true:

  • you can review one real Make system without defaulting to style complaints
  • you can describe a migration sequence that preserves proof after each step
  • you can write governance rules another maintainer could enforce
  • you can name recurring anti-patterns and explain why they are costly
  • you can defend one tool-boundary choice in terms of ownership and evidence

When those feel ordinary, Module 10 has done its job.