Restrict user from using yarn v4

artifactory/utils/yarn/configget.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 )
 
-// This method runs "yarn config set" command and sets the yarn configuration.
+// This method runs "yarn config get" command and sets the yarn configuration.
 func ConfigGet(key, executablePath string, jsonOutput bool) (string, error) {
 	var flags []string = nil
 	if jsonOutput {

artifactory/utils/yarn/versionVerify.go

@@ -0,0 +1,39 @@
+package yarn
+
+import (
+	gofrogcmd "github.com/jfrog/gofrog/io"
+	"github.com/jfrog/gofrog/version"
+	"github.com/jfrog/jfrog-client-go/utils/errorutils"
+	"strings"
+)
+
+const UNSUPPORTED_YARN_VERSION = "4.0.0"
+
+func VerifyYarnVersionSupport(executablePath string) error {
+	versionGetCmdConfig := getVersionCmdConfig(executablePath)
+	output, err := gofrogcmd.RunCmdOutput(versionGetCmdConfig)
+	if err != nil {
+		return errorutils.CheckError(err)
+	}
+	yarnVersionStr := strings.TrimSpace(output)
+	return IsVersionSupported(yarnVersionStr)
+}
+
+func IsVersionSupported(versionStr string) error {
+	yarnVersion := version.NewVersion(versionStr)
+	if yarnVersion.Compare(UNSUPPORTED_YARN_VERSION) < 0 {
+		return errorutils.CheckErrorf("Yarn version 4 is not supported. The current version is: " + versionStr +
+			". Please downgrade to a compatible version to continue")
+	}
+	return nil
+}
+
+func getVersionCmdConfig(executablePath string) *YarnConfig {
+	return &YarnConfig{
+		Executable:   executablePath,
+		Command:      []string{"--version"},
+		CommandFlags: nil,
+		StrWriter:    nil,
+		ErrWriter:    nil,
+	}
+}