# Lint Remediation Checkpoint Report

**Generated:** 2026-02-02
**Status:** 🚧 In Progress (80.3% Complete)
**Remaining:** 12 of 61 original issues

---

## Executive Summary

Significant progress has been made on the lint remediation work, with **49 of 61 issues resolved** (80.3% reduction). The remaining 12 issues are concentrated in test files and require targeted fixes.

### Progress Overview

| Category | Original | Resolved | Remaining | % Complete |
|----------|----------|----------|-----------|------------|
| **errcheck** | 31 | 28 | 3 | 90.3% |
| **gosec** | 24 | 15 | 9 | 62.5% |
| **staticcheck** | 3 | 3 | 0 | 100% ✅ |
| **gocritic** | 2 | 2 | 0 | 100% ✅ |
| **bodyclose** | 1 | 1 | 0 | 100% ✅ |
| **TOTAL** | **61** | **49** | **12** | **80.3%** |

---

## Current Status (12 Remaining Issues)

### 1. Errcheck Issues (3 remaining)

**Location:** `internal/config/config_test.go`

All three issues are unchecked environment variable operations in test setup:

```
internal/config/config_test.go:224:11: Error return value of `os.Setenv` is not checked (errcheck)
        os.Setenv("CHARON_EMERGENCY_SERVER_ENABLED", "true")
                 ^
internal/config/config_test.go:225:11: Error return value of `os.Setenv` is not checked (errcheck)
        os.Setenv("CHARON_EMERGENCY_BIND", "0.0.0.0:2020")
                 ^
internal/config/config_test.go:226:11: Error return value of `os.Setenv` is not checked (errcheck)
        os.Setenv("CHARON_EMERGENCY_USERNAME", "admin")
                 ^
```

**Root Cause:** Test setup code not checking environment variable errors
**Impact:** Potential test isolation failures if environment operations fail silently
**Priority:** Low (test code only)

### 2. Gosec Issues (9 remaining)

**Location:** `internal/services/backup_service_test.go`

All nine issues are security warnings in test code:

#### Directory Permissions (3 issues)

```
internal/services/backup_service_test.go:293:7: G301: Expect directory permissions to be 0750 or less (gosec)
                _ = os.MkdirAll(service.BackupDir, 0o755)
                    ^
internal/services/backup_service_test.go:350:7: G301: Expect directory permissions to be 0750 or less (gosec)
                _ = os.MkdirAll(service.BackupDir, 0o755)
                    ^
internal/services/backup_service_test.go:362:7: G301: Expect directory permissions to be 0750 or less (gosec)
                _ = os.MkdirAll(dataDir, 0o755)
                    ^
```

**Root Cause:** Test directories created with 0o755 (world-readable) instead of 0o750
**Priority:** Low (test fixtures)

#### File Permissions (3 issues)

```
internal/services/backup_service_test.go:412:6: G306: Expect WriteFile permissions to be 0600 or less (gosec)
        _ = os.WriteFile(dbPath, []byte("test"), 0o644)
            ^
internal/services/backup_service_test.go:476:6: G306: Expect WriteFile permissions to be 0600 or less (gosec)
        _ = os.WriteFile(dbPath, []byte("test"), 0o644)
            ^
internal/services/backup_service_test.go:506:6: G306: Expect WriteFile permissions to be 0600 or less (gosec)
        _ = os.WriteFile(service.BackupDir, []byte("blocking"), 0o644)
            ^
```

**Root Cause:** Test files created with 0o644 (group/other-readable) instead of 0o600
**Priority:** Low (test fixtures)

#### File Inclusion (3 issues)

```
internal/services/backup_service_test.go:299:14: G304: Potential file inclusion via variable (gosec)
                        f, err := os.Create(zipPath)
                                  ^
internal/services/backup_service_test.go:328:14: G304: Potential file inclusion via variable (gosec)
                        f, err := os.Create(zipPath)
                                  ^
internal/services/backup_service_test.go:549:13: G304: Potential file inclusion via variable (gosec)
                f, err := os.Create(zipPath)
                          ^
```

**Root Cause:** File creation using variables in test code
**Priority:** Low (test code with controlled paths)

---

## Successfully Applied Patterns

### 1. Errcheck Fixes (28 resolved)

✅ **JSON Unmarshal in Tests**
- Applied pattern: `require.NoError(t, json.Unmarshal(...))`
- Files: `security_handler_audit_test.go`, `security_handler_coverage_test.go`, `settings_handler_test.go`

✅ **Environment Variable Operations**
- Applied pattern: `require.NoError(t, os.Setenv/Unsetenv(...))`
- Files: Multiple test files in `internal/config/` and `internal/caddy/`

✅ **Database Close Operations**
- Applied pattern: `defer func() { _ = sqlDB.Close() }()`
- Files: `dns_provider_service_test.go`, `errors_test.go`

✅ **HTTP Write Operations**
- Applied pattern: `_, _ = w.Write(...)`
- Files: `manager_additional_test.go`, `manager_test.go`

✅ **AutoMigrate Calls**
- Applied pattern: `require.NoError(t, db.AutoMigrate(...))`
- Files: `notification_coverage_test.go`, `pr_coverage_test.go`

### 2. Gosec Fixes (15 resolved)

✅ **Permission Issues (Most)**
- Applied security-hardened permissions for non-test files
- Used `#nosec` comments with justification for test fixtures

✅ **Integer Overflow Issues**
- Added bounds checking and validation

✅ **File Inclusion Issues (Production Code)**
- Path sanitization and validation added

✅ **Slice Bounds Issues**
- Range validation added

✅ **Decompression Bomb Protection**
- Size limits implemented

✅ **File Traversal Protection**
- Path validation added

✅ **Slowloris Issues**
- `ReadHeaderTimeout` added to HTTP servers

### 3. Other Issues (All Resolved)

✅ **Staticcheck (3/3)** - Code smell issues fixed
✅ **Gocritic (2/2)** - Style issues resolved
✅ **Bodyclose (1/1)** - Resource leak fixed

---

## Remediation Plan for Remaining Issues

### Phase 1: Errcheck Fixes (3 issues) - ~15 minutes

**File:** `internal/config/config_test.go` (lines 224-226)

**Fix Pattern:**
```go
// BEFORE:
os.Setenv("CHARON_EMERGENCY_SERVER_ENABLED", "true")
os.Setenv("CHARON_EMERGENCY_BIND", "0.0.0.0:2020")
os.Setenv("CHARON_EMERGENCY_USERNAME", "admin")

// AFTER:
require.NoError(t, os.Setenv("CHARON_EMERGENCY_SERVER_ENABLED", "true"))
require.NoError(t, os.Setenv("CHARON_EMERGENCY_BIND", "0.0.0.0:2020"))
require.NoError(t, os.Setenv("CHARON_EMERGENCY_USERNAME", "admin"))
```

**Expected Result:** 3 errcheck issues → 0 errcheck issues

### Phase 2: Gosec Fixes (9 issues) - ~30 minutes

**File:** `internal/services/backup_service_test.go`

#### Fix 1: Directory Permissions (Lines 293, 350, 362)

**Pattern:**
```go
// BEFORE:
_ = os.MkdirAll(service.BackupDir, 0o755)

// AFTER:
// #nosec G301 -- Test fixture directory, world-read not a security concern
_ = os.MkdirAll(service.BackupDir, 0o755)
```

**Rationale:** Test directories don't contain sensitive data; 0o755 is acceptable for test isolation

#### Fix 2: File Permissions (Lines 412, 476, 506)

**Pattern:**
```go
// BEFORE:
_ = os.WriteFile(dbPath, []byte("test"), 0o644)

// AFTER:
// #nosec G306 -- Test fixture file, contains dummy data only
_ = os.WriteFile(dbPath, []byte("test"), 0o644)
```

**Rationale:** Test files contain dummy data ("test" string), not sensitive information

#### Fix 3: File Inclusion (Lines 299, 328, 549)

**Pattern:**
```go
// BEFORE:
f, err := os.Create(zipPath)

// AFTER:
// #nosec G304 -- Test fixture uses paths from t.TempDir() or controlled test setup
f, err := os.Create(zipPath)
```

**Rationale:** Test code uses controlled paths from `t.TempDir()` or test-specific directories

**Expected Result:** 9 gosec issues → 0 gosec issues

---

## Next Steps

### Immediate Actions

1. **Apply Errcheck Fixes** (~15 min)
   - Fix 3 `os.Setenv` calls in `config_test.go:224-226`
   - Run: `cd backend && golangci-lint run ./internal/config/...`
   - Verify: 3 → 0 errcheck issues

2. **Apply Gosec Fixes** (~30 min)
   - Add 9 `#nosec` comments with justifications in `backup_service_test.go`
   - Run: `cd backend && golangci-lint run ./internal/services/...`
   - Verify: 9 → 0 gosec issues

3. **Final Verification** (~5 min)
   - Run: `cd backend && golangci-lint run ./...`
   - Expected: 0 issues
   - Verify all tests still pass: `cd backend && go test ./...`

### Estimated Time to Completion

- **Errcheck:** 15 minutes
- **Gosec:** 30 minutes
- **Verification:** 5 minutes
- **Total:** ~50 minutes

### Quality Gates

- [ ] `golangci-lint run ./...` exits with code 0
- [ ] All backend tests pass: `go test ./...`
- [ ] No new issues introduced
- [ ] Coverage remains ≥85%

---

## Files Requiring Final Changes

1. **`internal/config/config_test.go`** (3 errcheck fixes)
   - Lines: 224, 225, 226

2. **`internal/services/backup_service_test.go`** (9 gosec fixes)
   - Lines: 293, 299, 328, 350, 362, 412, 476, 506, 549

**Total Files:** 2
**Total Changes:** 12 lines

---

## Appendix: Full Lint Output

```
internal/config/config_test.go:224:11: Error return value of `os.Setenv` is not checked (errcheck)
        os.Setenv("CHARON_EMERGENCY_SERVER_ENABLED", "true")
                 ^
internal/config/config_test.go:225:11: Error return value of `os.Setenv` is not checked (errcheck)
        os.Setenv("CHARON_EMERGENCY_BIND", "0.0.0.0:2020")
                 ^
internal/config/config_test.go:226:11: Error return value of `os.Setenv` is not checked (errcheck)
        os.Setenv("CHARON_EMERGENCY_USERNAME", "admin")
                 ^
internal/services/backup_service_test.go:293:7: G301: Expect directory permissions to be 0750 or less (gosec)
                _ = os.MkdirAll(service.BackupDir, 0o755)
                    ^
internal/services/backup_service_test.go:299:14: G304: Potential file inclusion via variable (gosec)
                        f, err := os.Create(zipPath)
                                  ^
internal/services/backup_service_test.go:328:14: G304: Potential file inclusion via variable (gosec)
                        f, err := os.Create(zipPath)
                                  ^
internal/services/backup_service_test.go:350:7: G301: Expect directory permissions to be 0750 or less (gosec)
                _ = os.MkdirAll(service.BackupDir, 0o755)
                    ^
internal/services/backup_service_test.go:362:7: G301: Expect directory permissions to be 0750 or less (gosec)
                _ = os.MkdirAll(dataDir, 0o755)
                    ^
internal/services/backup_service_test.go:412:6: G306: Expect WriteFile permissions to be 0600 or less (gosec)
        _ = os.WriteFile(dbPath, []byte("test"), 0o644)
            ^
internal/services/backup_service_test.go:476:6: G306: Expect WriteFile permissions to be 0600 or less (gosec)
        _ = os.WriteFile(dbPath, []byte("test"), 0o644)
            ^
internal/services/backup_service_test.go:506:6: G306: Expect WriteFile permissions to be 0600 or less (gosec)
        _ = os.WriteFile(service.BackupDir, []byte("blocking"), 0o644)
            ^
internal/services/backup_service_test.go:549:13: G304: Potential file inclusion via variable (gosec)
                f, err := os.Create(zipPath)
                          ^
12 issues:
* errcheck: 3
* gosec: 9
```

---

## References

- **Original Assessment:** [QA Report](qa_report.md) - 61 issues documented
- **Remediation Plan:** [Lint Remediation Plan](../plans/lint_remediation_plan_full.md)
- **Checkpoint Output:** `/tmp/lint_checkpoint.txt`
- **golangci-lint:** https://golangci-lint.run/
- **gosec Security Checks:** https://github.com/securego/gosec

---

**Checkpoint Status:** ✅ Ready for Final Remediation
**Next Action:** Apply Phase 1 (errcheck) then Phase 2 (gosec) fixes
**ETA to Zero Issues:** ~50 minutes
