add feature flag pkg

pkg/feature/feature.go

@@ -0,0 +1,17 @@
+package feature
+
+import (
+	"os"
+
+	"github.com/SAP/jenkins-library/pkg/log"
+)
+
+const prefix = "com_sap_piper_featureFlag_"
+
+func IsFeatureEnabled(flag string) bool {
+	if os.Getenv(prefix+flag) == "true" {
+		log.Entry().Infof("Feature '%s%s' is enabled", prefix, flag)
+		return true
+	}
+	return false
+}

pkg/feature/feature_test.go

@@ -0,0 +1,20 @@
+package feature
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsFeatureEnabled(t *testing.T) {
+	t.Run("Azure - BranchBuild", func(t *testing.T) {
+		assert.False(t, IsFeatureEnabled("newFeature"))
+
+		// defer resetEnv(os.Environ())
+		os.Setenv(prefix+"newFeature", "true")
+		defer os.Setenv(prefix+"newFeature", "")
+
+		assert.True(t, IsFeatureEnabled("newFeature"))
+	})
+}