Update Go (#1147)

* Update Go to 1.24.
* Update golangci-lint to v2.
* Fixup linting issues.

Signed-off-by: SuperQ <superq@gmail.com>

.circleci/config.yml

@@ -8,7 +8,7 @@ executors:
   # This must match .promu.yml.
   golang:
     docker:
-    - image: cimg/go:1.23
+    - image: cimg/go:1.24
 
 jobs:
   test:
@@ -23,7 +23,7 @@ jobs:
 
   integration:
     docker:
-    - image: cimg/go:1.23
+    - image: cimg/go:1.24
     - image: << parameters.postgres_image >>
       environment:
         POSTGRES_DB: circle_test

.github/workflows/golangci-lint.yml

@@ -33,7 +33,7 @@ jobs:
         run: sudo apt-get update && sudo apt-get -y install libsnmp-dev
         if: github.repository == 'prometheus/snmp_exporter'
       - name: Lint
-        uses: golangci/golangci-lint-action@55c2c1448f86e01eaae002a5a3a9624417608d84 # v6.5.2
+        uses: golangci/golangci-lint-action@1481404843c368bc19ca9406f87d6e0fc97bdcfd # v7.0.0
         with:
           args: --verbose
-          version: v1.64.6
+          version: v2.0.2

.golangci.yml

@@ -1,23 +1,36 @@
----
+version: "2"
 linters:
   enable:
-  - misspell
-  - revive
-
-issues:
-  exclude-rules:
-  - path: _test.go
-    linters:
-    - errcheck
-
-linters-settings:
-  errcheck:
-    exclude-functions:
-      # Never check for logger errors.
-      - (github.com/go-kit/log.Logger).Log
-  revive:
+    - misspell
+    - revive
+  settings:
+    errcheck:
+      exclude-functions:
+        - (github.com/go-kit/log.Logger).Log
+    revive:
+      rules:
+        - name: unused-parameter
+          severity: warning
+          disabled: true
+  exclusions:
+    generated: lax
+    presets:
+      - comments
+      - common-false-positives
+      - legacy
+      - std-error-handling
     rules:
-      # https://github.com/mgechev/revive/blob/master/RULES_DESCRIPTIONS.md#unused-parameter
-      - name: unused-parameter
-        severity: warning
-        disabled: true
+      - linters:
+          - errcheck
+        path: _test.go
+    paths:
+      - third_party$
+      - builtin$
+      - examples$
+formatters:
+  exclusions:
+    generated: lax
+    paths:
+      - third_party$
+      - builtin$
+      - examples$

.promu.yml

@@ -1,6 +1,6 @@
 go:
     # This must match .circle/config.yml.
-    version: 1.23
+    version: 1.24
 repository:
     path: github.com/prometheus-community/postgres_exporter
 build:

Makefile.common

@@ -61,7 +61,7 @@ PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_
 SKIP_GOLANGCI_LINT :=
 GOLANGCI_LINT :=
 GOLANGCI_LINT_OPTS ?=
-GOLANGCI_LINT_VERSION ?= v1.64.6
+GOLANGCI_LINT_VERSION ?= v2.0.2
 # golangci-lint only supports linux, darwin and windows platforms on i386/amd64/arm64.
 # windows isn't included here because of the path separator being different.
 ifeq ($(GOHOSTOS),$(filter $(GOHOSTOS),linux darwin))

cmd/postgres_exporter/pg_setting.go

@@ -67,7 +67,7 @@ type pgSetting struct {
 func (s *pgSetting) metric(labels prometheus.Labels) prometheus.Metric {
 	var (
 		err       error
-		name      = strings.Replace(strings.Replace(s.name, ".", "_", -1), "-", "_", -1)
+		name      = strings.ReplaceAll(strings.ReplaceAll(s.name, ".", "_"), "-", "_")
 		unit      = s.unit // nolint: ineffassign
 		shortDesc = fmt.Sprintf("Server Parameter: %s", s.name)
 		subsystem = "settings"
@@ -131,7 +131,7 @@ func (s *pgSetting) normaliseUnit() (val float64, unit string, err error) {
 	case "B", "kB", "MB", "GB", "TB", "1kB", "2kB", "4kB", "8kB", "16kB", "32kB", "64kB", "16MB", "32MB", "64MB":
 		unit = "bytes"
 	default:
-		err = fmt.Errorf("Unknown unit for runtime variable: %q", s.unit)
+		err = fmt.Errorf("unknown unit for runtime variable: %q", s.unit)
 		return
 	}
 

cmd/postgres_exporter/pg_setting_test.go

@@ -214,7 +214,7 @@ var fixtures = []fixture{
 		n: normalised{
 			val:  10,
 			unit: "",
-			err:  `Unknown unit for runtime variable: "nonexistent"`,
+			err:  `unknown unit for runtime variable: "nonexistent"`,
 		},
 	},
 }
@@ -240,7 +240,7 @@ func (s *PgSettingSuite) TestNormaliseUnit(c *C) {
 func (s *PgSettingSuite) TestMetric(c *C) {
 	defer func() {
 		if r := recover(); r != nil {
-			if r.(error).Error() != `Unknown unit for runtime variable: "nonexistent"` {
+			if r.(error).Error() != `unknown unit for runtime variable: "nonexistent"` {
 				panic(r)
 			}
 		}

collector/collector_test.go

@@ -48,15 +48,15 @@ func readMetric(m prometheus.Metric) MetricResult {
 
 func sanitizeQuery(q string) string {
 	q = strings.Join(strings.Fields(q), " ")
-	q = strings.Replace(q, "(", "\\(", -1)
-	q = strings.Replace(q, "?", "\\?", -1)
-	q = strings.Replace(q, ")", "\\)", -1)
-	q = strings.Replace(q, "[", "\\[", -1)
-	q = strings.Replace(q, "]", "\\]", -1)
-	q = strings.Replace(q, "{", "\\{", -1)
-	q = strings.Replace(q, "}", "\\}", -1)
-	q = strings.Replace(q, "*", "\\*", -1)
-	q = strings.Replace(q, "^", "\\^", -1)
-	q = strings.Replace(q, "$", "\\$", -1)
+	q = strings.ReplaceAll(q, "(", "\\(")
+	q = strings.ReplaceAll(q, "?", "\\?")
+	q = strings.ReplaceAll(q, ")", "\\)")
+	q = strings.ReplaceAll(q, "[", "\\[")
+	q = strings.ReplaceAll(q, "]", "\\]")
+	q = strings.ReplaceAll(q, "{", "\\{")
+	q = strings.ReplaceAll(q, "}", "\\}")
+	q = strings.ReplaceAll(q, "*", "\\*")
+	q = strings.ReplaceAll(q, "^", "\\^")
+	q = strings.ReplaceAll(q, "$", "\\$")
 	return q
 }

config/config.go

@@ -79,14 +79,14 @@ func (ch *Handler) ReloadConfig(f string, logger *slog.Logger) error {
 
 	yamlReader, err := os.Open(f)
 	if err != nil {
-		return fmt.Errorf("Error opening config file %q: %s", f, err)
+		return fmt.Errorf("error opening config file %q: %s", f, err)
 	}
 	defer yamlReader.Close()
 	decoder := yaml.NewDecoder(yamlReader)
 	decoder.KnownFields(true)
 
 	if err = decoder.Decode(config); err != nil {
-		return fmt.Errorf("Error parsing config file %q: %s", f, err)
+		return fmt.Errorf("error parsing config file %q: %s", f, err)
 	}
 
 	ch.Lock()

config/config_test.go

@@ -24,7 +24,7 @@ func TestLoadConfig(t *testing.T) {
 
 	err := ch.ReloadConfig("testdata/config-good.yaml", nil)
 	if err != nil {
-		t.Errorf("Error loading config: %s", err)
+		t.Errorf("error loading config: %s", err)
 	}
 }
 
@@ -39,11 +39,11 @@ func TestLoadBadConfigs(t *testing.T) {
 	}{
 		{
 			input: "testdata/config-bad-auth-module.yaml",
-			want:  "Error parsing config file \"testdata/config-bad-auth-module.yaml\": yaml: unmarshal errors:\n  line 3: field pretendauth not found in type config.AuthModule",
+			want:  "error parsing config file \"testdata/config-bad-auth-module.yaml\": yaml: unmarshal errors:\n  line 3: field pretendauth not found in type config.AuthModule",
 		},
 		{
 			input: "testdata/config-bad-extra-field.yaml",
-			want:  "Error parsing config file \"testdata/config-bad-extra-field.yaml\": yaml: unmarshal errors:\n  line 8: field doesNotExist not found in type config.AuthModule",
+			want:  "error parsing config file \"testdata/config-bad-extra-field.yaml\": yaml: unmarshal errors:\n  line 8: field doesNotExist not found in type config.AuthModule",
 		},
 	}