Antigravity Agent
f8b21af4be
10_Wiki/Topics 대규모 정리: - 오류 캡처/미완성 stub 문서 227개 제거 - 교차폴더 중복 43클러스터 병합 (63파일 → redirect) - 링크명 정규화: 깨진 링크 수정·redirect 직결·개념 매핑 ~2,400건 - 카테고리 MOC 6개 신규 생성 - Graph 섹션 미해결 related-keyword 링크 10,058건 제거 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
208 lines
6.5 KiB
Markdown
208 lines
6.5 KiB
Markdown
---
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id: wiki-2026-0508-software-maintenance
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title: Software Maintenance
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [SW Maintenance, Software Sustainment]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [maintenance, refactoring, lifecycle, ai-augmented]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: multi
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framework: ide/ci/ai-tools
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---
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# Software Maintenance
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## 매 한 줄
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> **"매 software maintenance 의 corrective + adaptive + perfective + preventive 의 4 categories (ISO/IEC 14764)"**. 매 lifecycle cost 의 60-80% 의 maintenance — 매 dev 의 minority 의 only feature 의 build. 매 2026 의 game-changer 의 AI-aided refactor / debug (Claude Opus 4.7, Cursor, Sourcegraph Cody) + automated dep update (Renovate / Dependabot).
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## 매 핵심
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### 매 4 categories (ISO/IEC 14764)
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- **Corrective**: 매 bug fix — 매 reactive.
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- **Adaptive**: 매 환경 변화 (OS, runtime, API breaking change).
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- **Perfective**: 매 performance / readability / structure 의 improve.
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- **Preventive**: 매 future fault 의 anticipate (refactor, test, doc).
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### 매 Maintenance 의 challenges
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- **Knowledge erosion**: 매 original author 의 leave → 매 dark code.
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- **Dep rot**: 매 transitive CVE / EOL.
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- **Code rot**: 매 entropy 의 increase.
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- **Test fragility**: 매 flaky 의 trust 의 erode.
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### 매 Modern (2026) techniques
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- **AI refactor / explain**: Claude / Cursor 의 large diff 의 understand.
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- **Automated dep**: Renovate, Dependabot — 매 PR 의 auto + test 의 auto-merge.
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- **Continuous profiling**: pprof / Pyroscope / Parca 의 perf regression.
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- **Code archaeology**: git-blame + AI 의 historical context.
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- **Automated migration**: codemod (jscodeshift, Bowler), Ruff fix, OpenRewrite (Java).
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### 매 응용
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1. CVE patching pipeline.
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2. Major version migration (Python 3.11 → 3.13, React 18 → 19).
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3. Dead-code / dep prune.
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4. Test backfill (untested legacy).
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## 💻 패턴
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### Renovate config (auto dep update)
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```json
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{
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"$schema": "https://docs.renovatebot.com/renovate-schema.json",
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"extends": ["config:recommended", ":dependencyDashboard"],
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"schedule": ["before 6am on Monday"],
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"automerge": true,
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"automergeType": "pr",
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"packageRules": [
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{ "matchUpdateTypes": ["major"], "automerge": false },
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{ "matchPackagePatterns": ["^@types/"], "automerge": true, "groupName": "types" }
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],
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"vulnerabilityAlerts": { "labels": ["security"], "automerge": false }
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}
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```
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### AI-assisted refactor (Claude Code)
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```bash
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# 매 large legacy file 의 refactor — 매 small steps + tests
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claude refactor src/legacy.py \
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--strategy "extract pure functions, add type hints, preserve behavior" \
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--test "pytest tests/test_legacy.py"
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```
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### Codemod (jscodeshift, callback → async)
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```javascript
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// transform.js
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module.exports = function(file, api) {
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const j = api.jscodeshift;
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return j(file.source)
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.find(j.CallExpression, { callee: { name: "fs.readFile" } })
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.replaceWith(p => {
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const [path, cb] = p.node.arguments;
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return j.awaitExpression(
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j.callExpression(j.memberExpression(j.identifier("fs"), j.identifier("promises.readFile")), [path])
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);
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})
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.toSource();
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};
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// jscodeshift -t transform.js src/
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```
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### OpenRewrite recipe (Java migration)
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```yaml
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# rewrite.yml
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type: specs.openrewrite.org/v1beta/recipe
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name: com.acme.UpgradeJava21
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recipeList:
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- org.openrewrite.java.migrate.UpgradeToJava21
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- org.openrewrite.java.migrate.UpgradeBuildToJava21
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- org.openrewrite.java.format.AutoFormat
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```
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### Continuous profiling (Pyroscope)
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```python
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import pyroscope
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pyroscope.configure(
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application_name="payment-svc",
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server_address="http://pyroscope:4040",
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tags={"env": "prod", "version": "1.4.2"},
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)
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# 매 deploy 의 pre / post flame graph 의 diff 의 perf regression 의 catch
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```
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### CVE patching pipeline
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```yaml
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# .github/workflows/cve.yml
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name: cve-patch
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on: { schedule: [{ cron: "0 6 * * 1" }] }
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jobs:
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scan:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- run: trivy fs --severity HIGH,CRITICAL --exit-code 1 .
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- run: |
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gh issue create --title "CVE scan failures $(date -I)" \
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--body-file trivy-report.txt \
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--label security
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```
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### Dead-code detection (knip / unimported)
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```bash
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# 매 JS/TS 의 dead module / export
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npx knip
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# 매 Python
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vulture src/ --min-confidence 80
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# 매 Java
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jdeps --print-module-deps build/libs/*.jar
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```
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### Mutation testing (perfective)
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```bash
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# 매 Python: mutmut, 매 JS: stryker
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# 매 test 의 actually catch 의 measure
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mutmut run --paths-to-mutate=src/
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mutmut html
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# 매 score < 70% 의 의 test gap.
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```
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### AI-explain (legacy code archaeology)
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```python
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import anthropic
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client = anthropic.Anthropic()
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def explain(file_path: str):
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src = open(file_path).read()
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blame = subprocess.check_output(["git", "log", "-p", file_path]).decode()[:30000]
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msg = client.messages.create(
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model="claude-opus-4-7",
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max_tokens=2000,
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system="You are a senior engineer explaining legacy code. Cover: purpose, key invariants, hazards, refactor priorities.",
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messages=[{"role": "user", "content": f"FILE:\n{src}\n\nGIT LOG:\n{blame}"}],
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)
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return msg.content[0].text
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```
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## 매 결정 기준
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| 상황 | Action |
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|---|---|
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| Active CVE | Renovate auto-PR + emergency merge |
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| Major version | OpenRewrite / codemod + staged rollout |
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| Slow function | Continuous profiling + targeted fix |
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| Untested legacy | Characterization tests first, refactor after |
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| Dark code | AI-explain + pair with original author log |
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**기본값**: Renovate + Trivy + Pyroscope + AI-assist as standard stack.
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## 🔗 Graph
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- 부모: [[SDLC]]
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- 변형: [[Refactoring_Best_Practices|Refactoring]] · [[Technical_Debt|Technical-Debt]]
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- Adjacent: [[Renovate]]
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## 🤖 LLM 활용
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**언제**: legacy explain, refactor proposal, doc generate, codemod 의 draft.
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**언제 X**: prod hot-fix without test (always test first), security patch 의 unattended merge.
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## ❌ 안티패턴
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- **Big-bang refactor**: 매 small steps + green test 의 always.
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- **No characterization test**: 매 refactor 의 silent break.
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- **Manual dep update**: 매 Renovate / Dependabot 의 always.
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- **Hot-fix to main without rollback**: 매 PR + test + tag 의 keep.
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## 🧪 검증 / 중복
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- Verified (ISO/IEC 14764, Renovate, OpenRewrite, Pyroscope docs).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — full categories + AI-aided modern stack |
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