update actions, and fix linting issues

.github/workflows/ci.yaml

@@ -1,26 +1,31 @@
 name: CI
 
-on:
-  push:
-    branches: [master]
-  pull_request:
+on: [push, pull_request]
+
+# Default to 'contents: read', which grants actions to read commits. Any
+# permission not included is implicitly set to "none".
+#
+# see https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
+permissions:
+  contents: read
 
 jobs:
   test:
     name: Test
     runs-on: ubuntu-latest
+    timeout-minutes: 20 # guardrails timeout
 
     strategy:
       fail-fast: false
       matrix:
-        go: ["1.12", "1.21", "1.22", "1.23"]
+        go: ["1.12", "1.21", "1.22", "1.23", "oldstable", "stable"]
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
       - name: Set up Go
-        uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
+        uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # v5.5.0
         with:
           go-version: ${{ matrix.go }}
 
@@ -32,17 +37,18 @@ jobs:
   lint:
     name: Lint
     runs-on: ubuntu-latest
+    timeout-minutes: 20 # guardrails timeout
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
       - name: Set up Go
-        uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
+        uses: actions/setup-go@d35c59abb061a4a6fb18e82ac0862c26744d6ab5 # v5.5.0
         with:
-          go-version: "1.23"
+          go-version: "stable"
 
       - name: Lint
-        uses: golangci/golangci-lint-action@971e284b6050e8a5849b72094c50ab08da042db8 # v6.1.1
+        uses: golangci/golangci-lint-action@4afd733a84b1f43292c63897423277bb7f4313a9 # v8.0.0
         with:
-          version: v1.63.4
+          version: v2.4

.golangci.yaml

@@ -1,4 +1,28 @@
+version: "2"
+
 linters:
-    disable-all: true
     enable:
+        - errorlint
         - nolintlint
+        - revive
+        - unconvert
+        - unparam
+    exclusions:
+        generated: disable
+        presets:
+            - comments
+            - std-error-handling
+    settings:
+        staticcheck:
+            # Enable all options, with some exceptions.
+            # For defaults, see https://golangci-lint.run/usage/linters/#staticcheck
+            checks:
+                - all
+                - -QF1008     # Omit embedded fields from selector expression; https://staticcheck.dev/docs/checks/#QF1008
+                - -ST1003     # Poorly chosen identifier; https://staticcheck.dev/docs/checks/#ST1003
+
+formatters:
+    enable:
+        - gofmt
+    exclusions:
+        generated: disable

bool_func_test.go

@@ -50,7 +50,7 @@ func TestBoolFuncUsage(t *testing.T) {
 		// regular boolfunc flag:
 		// expect to see '--flag1' followed by the usageMessage, and no mention of a default value
 		fset := NewFlagSet("unittest", ContinueOnError)
-		fset.BoolFunc("flag1", "usage message", func(s string) error { return nil })
+		fset.BoolFunc("flag1", "usage message", func(string) error { return nil })
 		usage := fset.FlagUsagesWrapped(80)
 
 		usage = strings.TrimSpace(usage)
@@ -64,7 +64,7 @@ func TestBoolFuncUsage(t *testing.T) {
 		// func flag, with a placeholder name:
 		// if usageMesage contains a placeholder, expect '--flag2 {placeholder}'; still expect no mention of a default value
 		fset := NewFlagSet("unittest", ContinueOnError)
-		fset.BoolFunc("flag2", "usage message with `name` placeholder", func(s string) error { return nil })
+		fset.BoolFunc("flag2", "usage message with `name` placeholder", func(string) error { return nil })
 		usage := fset.FlagUsagesWrapped(80)
 
 		usage = strings.TrimSpace(usage)

bool_slice.go

@@ -22,13 +22,12 @@ func newBoolSliceValue(val []bool, p *[]bool) *boolSliceValue {
 // Set converts, and assigns, the comma-separated boolean argument string representation as the []bool value of this flag.
 // If Set is called on a flag that already has a []bool assigned, the newly converted values will be appended.
 func (s *boolSliceValue) Set(val string) error {
-
 	// remove all quote characters
 	rmQuote := strings.NewReplacer(`"`, "", `'`, "", "`", "")
 
 	// read flag arguments with CSV parser
 	boolStrSlice, err := readAsCSV(rmQuote.Replace(val))
-	if err != nil && err != io.EOF {
+	if err != nil && err != io.EOF { //nolint:errorlint // not using errors.Is for compatibility with go1.12
 		return err
 	}
 
@@ -60,7 +59,6 @@ func (s *boolSliceValue) Type() string {
 
 // String defines a "native" format for this boolean slice flag value.
 func (s *boolSliceValue) String() string {
-
 	boolStrSlice := make([]string, len(*s.value))
 	for i, b := range *s.value {
 		boolStrSlice[i] = strconv.FormatBool(b)

bool_slice_test.go

@@ -184,7 +184,6 @@ func TestBSAsSliceValue(t *testing.T) {
 }
 
 func TestBSBadQuoting(t *testing.T) {
-
 	tests := []struct {
 		Want    []bool
 		FlagArg []string

bool_test.go

@@ -26,7 +26,7 @@ func (v *triStateValue) IsBoolFlag() bool {
 }
 
 func (v *triStateValue) Get() interface{} {
-	return triStateValue(*v)
+	return *v
 }
 
 func (v *triStateValue) Set(s string) error {

bytes.go

@@ -18,7 +18,6 @@ func (bytesHex bytesHexValue) String() string {
 // Set implements pflag.Value.Set.
 func (bytesHex *bytesHexValue) Set(value string) error {
 	bin, err := hex.DecodeString(strings.TrimSpace(value))
-
 	if err != nil {
 		return err
 	}
@@ -39,20 +38,18 @@ func newBytesHexValue(val []byte, p *[]byte) *bytesHexValue {
 }
 
 func bytesHexConv(sval string) (interface{}, error) {
-
 	bin, err := hex.DecodeString(sval)
 
 	if err == nil {
 		return bin, nil
 	}
 
-	return nil, fmt.Errorf("invalid string being converted to Bytes: %s %s", sval, err)
+	return nil, fmt.Errorf("invalid string being converted to Bytes: %s %s", sval, err.Error())
 }
 
 // GetBytesHex return the []byte value of a flag with the given name
 func (f *FlagSet) GetBytesHex(name string) ([]byte, error) {
 	val, err := f.getFlagType(name, "bytesHex", bytesHexConv)
-
 	if err != nil {
 		return []byte{}, err
 	}
@@ -119,7 +116,6 @@ func (bytesBase64 bytesBase64Value) String() string {
 // Set implements pflag.Value.Set.
 func (bytesBase64 *bytesBase64Value) Set(value string) error {
 	bin, err := base64.StdEncoding.DecodeString(strings.TrimSpace(value))
-
 	if err != nil {
 		return err
 	}
@@ -140,19 +136,17 @@ func newBytesBase64Value(val []byte, p *[]byte) *bytesBase64Value {
 }
 
 func bytesBase64ValueConv(sval string) (interface{}, error) {
-
 	bin, err := base64.StdEncoding.DecodeString(sval)
 	if err == nil {
 		return bin, nil
 	}
 
-	return nil, fmt.Errorf("invalid string being converted to Bytes: %s %s", sval, err)
+	return nil, fmt.Errorf("invalid string being converted to Bytes: %s %s", sval, err.Error())
 }
 
 // GetBytesBase64 return the []byte value of a flag with the given name
 func (f *FlagSet) GetBytesBase64(name string) ([]byte, error) {
 	val, err := f.getFlagType(name, "bytesBase64", bytesBase64ValueConv)
-
 	if err != nil {
 		return []byte{}, err
 	}

count.go

@@ -13,7 +13,7 @@ func newCountValue(val int, p *int) *countValue {
 func (i *countValue) Set(s string) error {
 	// "+1" means that no specific value was passed, so increment
 	if s == "+1" {
-		*i = countValue(*i + 1)
+		*i = *i + 1
 		return nil
 	}
 	v, err := strconv.ParseInt(s, 0, 0)

duration_slice.go

@@ -1,7 +1,6 @@
 package pflag
 
 import (
-	"fmt"
 	"strings"
 	"time"
 )
@@ -46,7 +45,7 @@ func (s *durationSliceValue) Type() string {
 func (s *durationSliceValue) String() string {
 	out := make([]string, len(*s.value))
 	for i, d := range *s.value {
-		out[i] = fmt.Sprintf("%s", d)
+		out[i] = d.String()
 	}
 	return "[" + strings.Join(out, ",") + "]"
 }
@@ -56,7 +55,7 @@ func (s *durationSliceValue) fromString(val string) (time.Duration, error) {
 }
 
 func (s *durationSliceValue) toString(val time.Duration) string {
-	return fmt.Sprintf("%s", val)
+	return val.String()
 }
 
 func (s *durationSliceValue) Append(val string) error {

errors_test.go

@@ -51,8 +51,8 @@ func TestInvalidValueError(t *testing.T) {
 	if err.GetValue() != "foo" {
 		t.Errorf("Expected GetValue to return %q, got %q", "foo", err.GetValue())
 	}
-	if err.Unwrap() != expectedCause {
-		t.Errorf("Expected Unwrwap to return %q, got %q", expectedCause, err.Unwrap())
+	if actual := err.Unwrap(); actual != expectedCause { //nolint:errorlint // not using errors.Is for compatibility with go1.12
+		t.Errorf("Expected Unwrwap to return %q, got %q", expectedCause, actual)
 	}
 }