Automatic pre-change snapshots on every apply

[spydisec]

Field question: does rollback take a current backup first? The first-run capture was already automatic (and is the protected -Rollback target); this closes the gap for later applies - every real run now saves a timestamped pre-change snapshot (Baseline\snapshots\<ts>: full auditpol backup + channel/registry/SMB state JSON) before changing anything. -Rollback semantics unchanged (undo the kit entirely); manual point-in-time restore documented in help, FAQ and getting-started. Capture logic deduplicated into one Save-StateSnapshot function.

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Summary by CodeRabbit

• New Features

  • Added automatic, timestamped pre-change snapshots for subsequent baseline applications.
  • Snapshots capture audit policy, event channel settings, registry values, and supported SMB audit settings.
  • Preserved the complete first-run backup for rollback.
  • Snapshot creation now stops safely if the audit-policy backup cannot be completed.

• Documentation

  • Updated the changelog, getting-started guide, and rollback FAQ with snapshot and restoration details.

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📒 Files selected for processing (2)

• Enable-LoggingBaseline.ps1
• docs/faq.md

🚧 Files skipped from review as they are similar to previous changes (2)

• docs/faq.md
• Enable-LoggingBaseline.ps1

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Walkthrough

The PowerShell baseline now captures complete pre-change state before real applies. The first capture remains protected for rollback. Later applies save timestamped snapshots. Documentation and release notes describe the snapshot layout and restoration process.

Changes

Logging baseline snapshots

Layer / File(s)	Summary
Snapshot capture and apply flow Enable-LoggingBaseline.ps1	Save-StateSnapshot records audit policy, event-channel state, registry values and absence, SMB audit settings, host identity, and capture time. It validates auditpol /backup before writing snapshot metadata. First-run data remains reserved for rollback. Later real runs save timestamped snapshots.
Snapshot documentation and release notes CHANGELOG.md, docs/faq.md, docs/getting-started.md	The documentation describes automatic snapshots, storage paths, SMB restoration, and the v0.7.0 changes.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 913c8

The change adds automatic pre-change snapshots while preserving existing rollback behavior; no actionable merge-blocking risk remains beyond normal checks and review.

Sequence Diagram(s)

sequenceDiagram
  participant EnableLoggingBaseline as Enable-LoggingBaseline.ps1
  participant StateSources as Audit policy, channels, registry, SMB
  participant SnapshotDirectory as Baseline snapshots
  EnableLoggingBaseline->>StateSources: Read current state before changes
  StateSources-->>EnableLoggingBaseline: Return state values and presence
  EnableLoggingBaseline->>StateSources: Run auditpol /backup
  StateSources-->>EnableLoggingBaseline: Return backup status
  EnableLoggingBaseline->>SnapshotDirectory: Write JSON snapshot
  EnableLoggingBaseline->>StateSources: Apply logging baseline

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: automatic pre-change snapshots for each apply run.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/pre-change-snapshots

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Actionable comments posted: 2

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Inline comments:
In `@docs/faq.md`:
- Around line 45-46: Add SMB audit restoration to the procedure alongside the
existing channel and registry restoration: iterate through each State.json
SmbAudit entry and apply it with Set-SmbServerConfiguration when Side is server
or Set-SmbClientConfiguration when Side is client, using the recorded setting
values and accurate PowerShell syntax.

In `@Enable-LoggingBaseline.ps1`:
- Line 362: Update Save-StateSnapshot after the auditpol /backup invocation to
verify both a successful $LASTEXITCODE and the existence of the backup file
before writing the JSON marker; throw on either failure so incomplete snapshots
cannot be recorded.

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📥 Commits

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📒 Files selected for processing (4)

• CHANGELOG.md
• Enable-LoggingBaseline.ps1
• docs/faq.md
• docs/getting-started.md

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