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

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/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