feat(diff): field-level diff for the team settings block

[robbiet480]

Closes #40.

Summary

A team's settings: block was accepted by the parser and then thrown away — changing a failing-policies webhook URL or a host expiry window produced no diff output at all. This makes it a first-class, field-level diff like the global config sections.

Where the live values come from

GET /api/v1/fleet/teams already returns them. Probed against our production Fleet:

keys: [agent_options, created_at, description, features, host_count,
       host_expiry_settings, id, integrations, mdm, name, scripts,
       secrets, software, user_count, webhook_settings]

webhook_settings, host_expiry_settings, integrations, and features are exactly the sub-keys a team's settings: block configures, so no new endpoint is needed.

Changes

internal/parser — ParsedTeam.Settings holds the block as a nested map. settings: wins over team_settings: when a file carries both, matching how fleetctl gitops resolves them.

internal/api — Team.UnmarshalJSON decodes twice: into the typed struct, and into a generic map kept on Team.Settings. A settings sub-key Fleet adds later needs no change here.

internal/diff — diffTeamSettings walks the proposed block with the same flattenMap / getNestedValue machinery diffConfig uses and emits ConfigChange rows under the settings section. Results are sorted, because flattenMap walks maps in random order and unsorted output would churn between runs.

Baseline subtraction covers settings, so a change already merged to the base branch does not reappear in a later MR.

Safety

• secrets: is never diffed. Enroll secrets are credentials and this output lands in CI logs and MR comments. There is a test asserting a literal (non-placeholder) secret produces no rows.
• Values containing $ are skipped, as elsewhere — Fleet substitutes them server-side, so comparing them is pure noise.
• Sub-keys Fleet does not expose (e.g. mdm) are reported as skipped, not as changes. Reporting "not diffed" is honest; reporting "no changes" would not be.

No output changes

The terminal, JSON, and Markdown renderers already render per-result Config rows — only a stale comment saying "global scope only" needed updating.

Test plan

• go build ./..., go vet ./..., go test -race ./... — pass
• golangci-lint run — 0 issues
• Coverage: diff 81.8%, parser 81.9%, api 83.8% — all above the floor
• New tests: TestParseTeamSettings (5 cases incl. both spellings and precedence), TestDiffTeamSettings (9 cases incl. secrets, env vars, unknown and unexposed sub-keys), TestDiffTeamSettingsOrderIsStable, TestGetTeamsCapturesRawSettings, and TestDiffTestdataTeamSettings end to end through Diff
• Validated against the live Fleet instance with the production fleet-gitops repo: the real settings: block matches Fleet and produces zero rows; a modified copy produces exactly the four expected rows:

  Config:
    ~ settings.host_expiry_settings.host_expiry_enabled
        "false" → "true"
    ~ settings.host_expiry_settings.host_expiry_window
        "0" → "45"
    ~ settings.webhook_settings.failing_policies_webhook.enable_failing_policies_webhook
        "false" → "true"
    ~ settings.webhook_settings.failing_policies_webhook.host_batch_size
        "0" → "250"

Summary by CodeRabbit

• New Features

  • Added support for defining and comparing team-level settings in configuration files.
  • Supports webhook, host expiry, integrations, and feature settings.
  • Recognizes both modern settings and legacy team_settings formats, with modern settings taking precedence.
  • Team API responses now retain settings for more complete comparisons.

• Bug Fixes

  • Excludes secrets and unavailable values from comparisons.
  • Provides stable, normalized diff output for nested team settings.

• Documentation

  • Updated API and architecture documentation to describe team settings and comparison behavior.

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• internal/diff/differ_test.go
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Walkthrough

The PR adds team settings parsing and API retention. The diff engine compares supported settings at field level, excludes secrets and unavailable values, and produces stable output. Tests and documentation cover modern and legacy keys, API behavior, baseline subtraction, and skipped sections.

Changes

Team settings comparison

Layer / File(s)	Summary
Parse and retain team settings internal/parser/parser.go, internal/parser/parser_test.go, internal/api/client.go, internal/api/client_test.go, docs/API-Endpoints.md, docs/Architecture.md	The parser accepts settings: and team_settings:. settings: takes precedence. API teams retain raw settings in Team.Settings.
Compare and integrate team settings internal/diff/differ.go, internal/diff/differ_test.go, testdata/teams/workstations.yml	The diff engine compares supported settings fields, excludes secrets and unavailable values, handles skipped sections, subtracts baseline changes, and sorts output deterministically.
Document configuration scopes internal/output/terminal.go, docs/Architecture.md	Comments and architecture documentation describe global and team settings comparisons.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🟡 Moderate · up to 79cd2

An explicitly empty team settings block can incorrectly inherit values from the legacy block, causing the diff to report changes that are not present in the intended configuration. Merge should wait for this precedence bug and its regression test to be addressed.

Sequence Diagram(s)

sequenceDiagram
  participant YAMLParser
  participant APIClient
  participant DiffEngine
  participant TerminalRenderer
  YAMLParser->>DiffEngine: provide parsed team settings
  APIClient->>DiffEngine: provide raw Fleet team settings
  DiffEngine->>DiffEngine: compare fields and remove baseline changes
  DiffEngine->>TerminalRenderer: return sorted changes and skipped sections

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Possibly related PRs

• CampusTech/fleet-plan#36: Both PRs extend API models, parsing, and diffing for nested configuration data.

Suggested reviewers: claude

Poem

A rabbit parsed settings neat,
And matched each field from Fleet’s receipt.
Secrets stayed hidden, maps stayed bright,
Stable diffs lined up just right.
“Hop!” said the rabbit, “the checks all pass!”

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR meets the field-level diff and GET-only goals, but it uses generic maps instead of the typed settings structure requested by issue #40.	Add a typed parser representation for known settings sub-keys while retaining unknown settings opaquely.
Docstring Coverage	⚠️ Warning	Docstring coverage is 55.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: field-level diffs for team settings.
Description check	✅ Passed	The description covers the summary, changes, test plan, safety constraints, and validation results in sufficient detail.
Out of Scope Changes check	✅ Passed	The code, tests, fixtures, and documentation changes directly support the team settings diff objective in issue #40.

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Actionable comments posted: 1

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Inline comments:
In `@internal/parser/parser.go`:
- Around line 329-347: Update decodeSettingsNode so a successfully decoded empty
modern settings map returns nil immediately instead of checking later nodes;
preserve fallback only for zero or undecodable nodes. Add a regression case in
internal/parser/parser_test.go lines 1163-1172 covering settings: {} with
populated team_settings: and expecting nil.

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Configuration used: Organization UI

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Run ID: 56189af8-5427-4a2a-a9f4-cd85f531bcab

📥 Commits

Reviewing files that changed from the base of the PR and between 348c014 and 79cd2f1.

📒 Files selected for processing (10)

• docs/API-Endpoints.md
• docs/Architecture.md
• internal/api/client.go
• internal/api/client_test.go
• internal/diff/differ.go
• internal/diff/differ_test.go
• internal/output/terminal.go
• internal/parser/parser.go
• internal/parser/parser_test.go
• testdata/teams/workstations.yml

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