ci: install golangci-lint (Tier-2 quality)#133
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Adds golangci-lint workflow + conservative initial config to surface Go code-quality issues (errcheck, ineffassign, gocyclo, unused, staticcheck, misspell). Runs on PR + push-to-master + weekly schedule. Sibling-checkout pattern matches existing codeql.yml for replace-directive resolution. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Action v6 resolved to golangci-lint v1.64.8 (built with Go 1.24), which fails to load configs targeting Go 1.25. Action v8 ships golangci-lint v2.x which is Go 1.25-compatible. Config migrated to v2 format: removed gosimple (folded into staticcheck), moved exclude-rules under linters.exclusions, added version: "2" header. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…exclusions - gocyclo min-complexity 20 -> 69: ratchet baseline just above the largest pre-existing offender (StackHandler.New, complexity 68) so introducing the linter does not force 33 risky production-handler refactors. Lower over time. - Exclude SA1019 in MinIO provider (local-dev-only; deprecated-API swap is behavior-risky on the credential path). - Exclude QF1001 in resource.go (De Morgan on two SQL-injection identifier guards; inverting security boolean logic mechanically is unsafe). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
ineffassign (2):
- auth.go emitAuthLoginAudit: drop ineffectual email clone (never read in bg goroutine)
- mongo_test.go: remove dead first token assignment overwritten on next line
unused (3): removed genuinely-dead code with no test references:
- handlers-pkg readBody, presignOKEnvelope, capNetBindService const
staticcheck (28, all behavior-preserving):
- QF1002 admin_customers.go: switch{case x==""} -> switch x {case ""}
- S1016 email_webhooks.go / export_bvwave_test.go / export_test.go: struct-literal copy -> type conversion
- QF1008 internal_backup_refund.go / middleware/auth.go / crypto+razorpaybilling tests: drop embedded-field selectors
- S1008 magic_link.go: collapse to return strings.Contains(...)
- S1039 isolation_test.go: drop obsolete fmt.Sprint keep-import hack
- QF1003 idempotency_fingerprint_test.go: if/else-if -> tagged switch
- S1005 deployment_failure_test.go: drop unnecessary blank identifier
- QF1001 cli_auth_coverage_test.go: De Morgan (test assertion, not a security guard)
- QF1012 auth_final2_test / auth_oauth_coverage_test: Write([]byte(Sprintf)) -> Fprintf
- SA5001 admin_promos_audit_residual_test.go: check sqlmock err before defer Close
- SA9003 provisioner/client_cov_test.go: empty branch -> _ = br.Allow()
- QF1011 run_test.go: omit redundant func() error type (inferred from run)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
errcheck (90, behavior-preserving):
- 71 deferred closers (rows.Close / resp.Body.Close / stream.Close / *.Shutdown
across handlers/models/providers/email/main.go/testhelpers):
defer X.Close() -> defer func() { _ = X.Close() }()
- manual post-loop / scan-error-path rows.Close() in admin_customers.go and
admin_promo_codes.go: assigned to _ ('result set fully consumed')
- idempotency.go fingerprint-hash f.Close(): assigned to _ (read-only)
- stack.go tarball-read f.Close() after io.ReadAll: assigned to _ (in memory)
- k8s/client.go extractTarGz write f.Close(): assigned to _ (best-effort, loop continues)
- queue/local.go NATS health-check resp.Body.Close(): assigned to _ (StatusCode only)
- app_github_connection.go tx.Rollback(): defer func() { _ = tx.Rollback() }()
(the prior em-dash //nolint form was not a valid directive)
- testhelpers cleanup closures: db.Close / rdb.Close / app.Shutdown assigned to _
staticcheck: cli_auth_coverage_test.go QF1001 rewritten as an explicit isHex
bool so staticcheck no longer suggests further De Morgan reduction.
golangci-lint run --timeout=5m -> 0 issues. go build ./... + go vet ./... clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Adds golangci-lint to surface Go code-quality issues (errcheck, ineffassign, gocyclo, unused, staticcheck, misspell).
100% free for public repos. Runs in <2min per repo.
Conservative initial config — gosec excluded (covered by govulncheck + CodeQL), dupl excluded (noisy on fresh codebases). gocyclo threshold 20 (generous). Test files exempted from errcheck.
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