fix path is empty (#5833)

Signed-off-by: xliuqq <xlzq1992@gmail.com>

Author: xliuqq

pkg/ddc/cache/engine/cm.go

@@ -116,7 +116,8 @@ func (e *CacheEngine) generateRuntimeConfigData(runtime *datav1alpha1.CacheRunti
 			MountPoint: m.MountPoint,
 			ReadOnly:   m.ReadOnly,
 			Shared:     m.Shared,
-			Path:       m.Path,
+			// m.Path may be empty.
+			Path: utils.UFSPathBuilder{}.GenUFSPathInUnifiedNamespace(m),
 		}
 		options, encryptOptions, err := e.generateDatasetMountOptions(&m, dataset.Spec.SharedEncryptOptions, dataset.Spec.SharedOptions)
 		if err != nil {

test/gha-e2e/curvine/dataset.yaml

@@ -14,8 +14,8 @@ spec:
   accessModes: ["ReadWriteMany"]
   mounts:
     - mountPoint: "s3://test"
+      # path: /minio
       name: minio
-      path: /minio
       # bin/cv mount s3://test /minio \
       # -c s3.endpoint_url=http://127.0.0.1:19000 \
       # -c s3.region_name=us-east-1 \