feat: disable copyloopvar and intrange on Go < 1.22 (golangci#4397)

pkg/commands/executor.go

@@ -116,7 +116,18 @@ func NewExecutor(buildInfo BuildInfo) *Executor {
 		e.log.Fatalf("Can't read config: %s", err)
 	}
 
-	if (commandLineCfg == nil || commandLineCfg.Run.Go == "") && e.cfg != nil && e.cfg.Run.Go == "" {
+	if commandLineCfg != nil && commandLineCfg.Run.Go != "" {
+		// This hack allow to have the right Run information at least for the Go version (because the default value of the "go" flag is empty).
+		// If you put a log for `m.cfg.Run.Go` inside `GetAllSupportedLinterConfigs`,
+		// you will observe that at end (without this hack) the value will have the right value but too late,
+		// the linters are already running with the previous uncompleted configuration.
+		// TODO(ldez) there is a major problem with the executor:
+		//  the parsing of the configuration and the timing to load the configuration and linters are creating unmanageable situations.
+		//  There is no simple solution because it's spaghetti code.
+		//  I need to completely rewrite the command line system and the executor because it's extremely time consuming to debug,
+		//  so it's unmaintainable.
+		e.cfg.Run.Go = commandLineCfg.Run.Go
+	} else if e.cfg.Run.Go == "" {
 		e.cfg.Run.Go = config.DetectGoVersion()
 	}
 

pkg/config/config.go

@@ -41,18 +41,18 @@ type Version struct {
 	Debug  bool   `mapstructure:"debug"`
 }
 
-func IsGreaterThanOrEqualGo122(v string) bool {
-	v1, err := hcversion.NewVersion(strings.TrimPrefix(v, "go"))
+func IsGoGreaterThanOrEqual(current, limit string) bool {
+	v1, err := hcversion.NewVersion(strings.TrimPrefix(current, "go"))
 	if err != nil {
 		return false
 	}
 
-	limit, err := hcversion.NewVersion("1.22")
+	l, err := hcversion.NewVersion(limit)
 	if err != nil {
 		return false
 	}
 
-	return v1.GreaterThanOrEqual(limit)
+	return v1.GreaterThanOrEqual(l)
 }
 
 func DetectGoVersion() string {

pkg/config/config_test.go

@@ -0,0 +1,86 @@
+package config
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsGoGreaterThanOrEqual(t *testing.T) {
+	testCases := []struct {
+		desc    string
+		current string
+		limit   string
+		assert  assert.BoolAssertionFunc
+	}{
+		{
+			desc:    "current (with minor.major) lower than limit",
+			current: "go1.21",
+			limit:   "1.22",
+			assert:  assert.False,
+		},
+		{
+			desc:    "current (with 0 patch) lower than limit",
+			current: "go1.21.0",
+			limit:   "1.22",
+			assert:  assert.False,
+		},
+		{
+			desc:    "current (current with multiple patches) lower than limit",
+			current: "go1.21.6",
+			limit:   "1.22",
+			assert:  assert.False,
+		},
+		{
+			desc:    "current lower than limit (with minor.major)",
+			current: "go1.22",
+			limit:   "1.22",
+			assert:  assert.True,
+		},
+		{
+			desc:    "current lower than limit (with 0 patch)",
+			current: "go1.22.0",
+			limit:   "1.22",
+			assert:  assert.True,
+		},
+		{
+			desc:    "current lower than limit (current with multiple patches)",
+			current: "go1.22.6",
+			limit:   "1.22",
+			assert:  assert.True,
+		},
+		{
+			desc:    "current greater than limit",
+			current: "go1.23.0",
+			limit:   "1.22",
+			assert:  assert.True,
+		},
+		{
+			desc:    "current with no prefix",
+			current: "1.22",
+			limit:   "1.22",
+			assert:  assert.True,
+		},
+		{
+			desc:    "invalid current value",
+			current: "go",
+			limit:   "1.22",
+			assert:  assert.False,
+		},
+		{
+			desc:    "invalid limit value",
+			current: "go1.22",
+			limit:   "go",
+			assert:  assert.False,
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			test.assert(t, IsGoGreaterThanOrEqual(test.current, test.limit))
+		})
+	}
+}

pkg/golinters/govet.go

@@ -173,7 +173,7 @@ func analyzersFromConfig(settings *config.GovetSettings) []*analysis.Analyzer {
 
 func isAnalyzerEnabled(name string, cfg *config.GovetSettings, defaultAnalyzers []*analysis.Analyzer) bool {
 	// TODO(ldez) remove loopclosure when go1.23
-	if name == loopclosure.Analyzer.Name && config.IsGreaterThanOrEqualGo122(cfg.Go) {
+	if name == loopclosure.Analyzer.Name && config.IsGoGreaterThanOrEqual(cfg.Go, "1.22") {
 		return false
 	}
 

pkg/golinters/paralleltest.go

@@ -18,7 +18,7 @@ func NewParallelTest(settings *config.ParallelTestSettings) *goanalysis.Linter {
 			"ignoremissingsubtests": settings.IgnoreMissingSubtests,
 		}
 
-		if config.IsGreaterThanOrEqualGo122(settings.Go) {
+		if config.IsGoGreaterThanOrEqual(settings.Go, "1.22") {
 			d["ignoreloopVar"] = true
 		}
 

pkg/lint/linter/config.go

@@ -1,7 +1,8 @@
 package linter
 
 import (
-	"golang.org/x/tools/go/analysis"
+	"fmt"
+
 	"golang.org/x/tools/go/packages"
 
 	"github.com/golangci/golangci-lint/pkg/config"
@@ -133,23 +134,27 @@ func (lc *Config) Name() string {
 	return lc.Linter.Name()
 }
 
-func (lc *Config) WithNoopFallback(cfg *config.Config) *Config {
-	if cfg != nil && config.IsGreaterThanOrEqualGo122(cfg.Run.Go) {
-		lc.Linter = &Noop{
-			name: lc.Linter.Name(),
-			desc: lc.Linter.Desc(),
-			run: func(_ *analysis.Pass) (any, error) {
-				return nil, nil
-			},
-		}
-
+func (lc *Config) WithNoopFallback(cfg *config.Config, cond func(cfg *config.Config) error) *Config {
+	if err := cond(cfg); err != nil {
+		lc.Linter = NewNoop(lc.Linter, err.Error())
 		lc.LoadMode = 0
+
 		return lc.WithLoadFiles()
 	}
 
 	return lc
 }
 
+func IsGoLowerThanGo122() func(cfg *config.Config) error {
+	return func(cfg *config.Config) error {
+		if cfg == nil || config.IsGoGreaterThanOrEqual(cfg.Run.Go, "1.22") {
+			return nil
+		}
+
+		return fmt.Errorf("this linter is disabled because the Go version (%s) of your project is lower than Go 1.22", cfg.Run.Go)
+	}
+}
+
 func NewConfig(linter Linter) *Config {
 	lc := &Config{
 		Linter: linter,

pkg/lint/linter/linter.go

@@ -3,8 +3,6 @@ package linter
 import (
 	"context"
 
-	"golang.org/x/tools/go/analysis"
-
 	"github.com/golangci/golangci-lint/pkg/result"
 )
 
@@ -15,14 +13,23 @@ type Linter interface {
 }
 
 type Noop struct {
-	name string
-	desc string
-	run  func(pass *analysis.Pass) (any, error)
+	name   string
+	desc   string
+	reason string
+}
+
+func NewNoop(l Linter, reason string) Noop {
+	return Noop{
+		name:   l.Name(),
+		desc:   l.Desc(),
+		reason: reason,
+	}
 }
 
 func (n Noop) Run(_ context.Context, lintCtx *Context) ([]result.Issue, error) {
-	lintCtx.Log.Warnf("%s is disabled because of generics."+
-		" You can track the evolution of the generics support by following the https://github.com/golangci/golangci-lint/issues/2649.", n.name)
+	if n.reason != "" {
+		lintCtx.Log.Warnf("%s: %s", n.name, n.reason)
+	}
 	return nil, nil
 }
 

pkg/lint/lintersdb/manager.go

@@ -303,7 +303,8 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 		linter.NewConfig(golinters.NewCopyLoopVar()).
 			WithSince("v1.57.0").
 			WithPresets(linter.PresetStyle).
-			WithURL("https://github.com/karamaru-alpha/copyloopvar"),
+			WithURL("https://github.com/karamaru-alpha/copyloopvar").
+			WithNoopFallback(m.cfg, linter.IsGoLowerThanGo122()),
 
 		linter.NewConfig(golinters.NewCyclop(cyclopCfg)).
 			WithSince("v1.37.0").
@@ -617,7 +618,8 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 
 		linter.NewConfig(golinters.NewIntrange()).
 			WithSince("v1.57.0").
-			WithURL("https://github.com/ckaznocha/intrange"),
+			WithURL("https://github.com/ckaznocha/intrange").
+			WithNoopFallback(m.cfg, linter.IsGoLowerThanGo122()),
 
 		linter.NewConfig(golinters.NewIreturn(ireturnCfg)).
 			WithSince("v1.43.0").

test/linters_test.go

@@ -84,7 +84,7 @@ func testOneSource(t *testing.T, log *logutils.StderrLog, binPath, sourcePath st
 	}
 
 	args := []string{
-		"--allow-parallel-runners",
+		"--go=1.22", // TODO(ldez) remove this line when we will run go1.23 on the CI. (related to intrange, copyloopvar)
 		"--disable-all",
 		"--out-format=json",
 		"--max-same-issues=100",
@@ -99,7 +99,6 @@ func testOneSource(t *testing.T, log *logutils.StderrLog, binPath, sourcePath st
 
 		cmd := testshared.NewRunnerBuilder(t).
 			WithBinPath(binPath).
-			WithNoParallelRunners().
 			WithArgs(caseArgs...).
 			WithRunContext(rc).
 			WithTargetPath(sourcePath).

test/run_test.go

@@ -133,12 +133,12 @@ func TestTestsAreLintedByDefault(t *testing.T) {
 func TestCgoOk(t *testing.T) {
 	testshared.NewRunnerBuilder(t).
 		WithNoConfig().
-		WithArgs(
-			"--timeout=3m",
+		WithArgs("--timeout=3m",
 			"--enable-all",
 			"-D",
-			"nosnakecase,gci",
+			"nosnakecase",
 		).
+		WithArgs("--go=1.22"). // TODO(ldez) remove this line when we will run go1.23 on the CI. (related to intrange, copyloopvar)
 		WithTargetPath(testdataDir, "cgo").
 		Runner().
 		Install().
@@ -356,6 +356,7 @@ func TestUnsafeOk(t *testing.T) {
 	testshared.NewRunnerBuilder(t).
 		WithNoConfig().
 		WithArgs("--enable-all").
+		WithArgs("--go=1.22"). // TODO(ldez) remove this line when we will run go1.23 on the CI. (related to intrange, copyloopvar)
 		WithTargetPath(testdataDir, "unsafe").
 		Runner().
 		Install().
@@ -514,6 +515,7 @@ func TestEnableAllFastAndEnableCanCoexist(t *testing.T) {
 			testshared.NewRunnerBuilder(t).
 				WithNoConfig().
 				WithArgs(test.args...).
+				WithArgs("--go=1.22"). // TODO(ldez) remove this line when we will run go1.23 on the CI. (related to intrange, copyloopvar)
 				WithTargetPath(testdataDir, minimalPkg).
 				Runner().
 				Run().

test/testdata/copyloopvar.go

@@ -1,3 +1,5 @@
+//go:build go1.22
+
 //golangcitest:args -Ecopyloopvar
 package testdata
 

test/testdata/intrange.go

@@ -1,3 +1,5 @@
+//go:build go1.22
+
 //golangcitest:args -Eintrange
 package testdata