feat: check that Go version use to build is greater or equals to the Go version of the project (#4938)

Author: ldez

pkg/config/config.go

@@ -1,8 +1,11 @@
 package config
 
 import (
+"fmt"
+"go/version"
 "os"
 "regexp"
+"runtime"
 "strings"
 
 hcversion "github.com/hashicorp/go-version"
@@ -108,3 +111,37 @@ func trimGoVersion(v string) string {
 
 return v
 }
+
+func getRuntimeGoVersion() string {
+goVersion := runtime.Version()
+
+parts := strings.Fields(goVersion)
+
+if len(parts) == 0 {
+return goVersion
+}
+
+// When using GOEXPERIMENT, the version returned might look something like "go1.23.0 X:boringcrypto".
+return parts[0]
+}
+
+func checkGoVersion(goVersion string) error {
+langVersion := version.Lang(getRuntimeGoVersion())
+
+runtimeVersion, err := hcversion.NewVersion(strings.TrimPrefix(langVersion, "go"))
+if err != nil {
+return err
+}
+
+targetedVersion, err := hcversion.NewVersion(trimGoVersion(goVersion))
+if err != nil {
+return err
+}
+
+if runtimeVersion.LessThan(targetedVersion) {
+return fmt.Errorf("the Go language version (%s) used to build golangci-lint is lower than the targeted Go version (%s)",
+langVersion, goVersion)
+}
+
+return nil
+}

pkg/config/config_test.go

@@ -4,6 +4,7 @@ import (
 "testing"
 
 "github.com/stretchr/testify/assert"
+"github.com/stretchr/testify/require"
 )
 
 func TestIsGoGreaterThanOrEqual(t *testing.T) {
@@ -131,3 +132,56 @@ func Test_trimGoVersion(t *testing.T) {
 })
 }
 }
+
+func Test_checkGoVersion(t *testing.T) {
+testCases := []struct {
+desc string
+version string
+require require.ErrorAssertionFunc
+}{
+{
+desc: "version greater than runtime version (patch)",
+version: "1.30.1",
+require: require.Error,
+},
+{
+desc: "version greater than runtime version (family)",
+version: "1.30",
+require: require.Error,
+},
+{
+desc: "version greater than runtime version (RC)",
+version: "1.30.0-rc1",
+require: require.Error,
+},
+{
+desc: "version equals to runtime version",
+version: getRuntimeGoVersion(),
+require: require.NoError,
+},
+{
+desc: "version lower than runtime version (patch)",
+version: "1.19.1",
+require: require.NoError,
+},
+{
+desc: "version lower than runtime version (family)",
+version: "1.19",
+require: require.NoError,
+},
+{
+desc: "version lower than runtime version (RC)",
+version: "1.19.0-rc1",
+require: require.NoError,
+},
+}
+
+for _, test := range testCases {
+t.Run(test.desc, func(t *testing.T) {
+t.Parallel()
+
+err := checkGoVersion(test.version)
+test.require(t, err)
+})
+}
+}

pkg/config/loader.go

@@ -74,6 +74,11 @@ func (l *Loader) Load(opts LoadOptions) error {
 
 l.handleGoVersion()
 
+err = checkGoVersion(l.cfg.Run.Go)
+if err != nil {
+return err
+}
+
 err = l.handleEnableOnlyOption()
 if err != nil {
 return err