validation: add check for namespace path

Signed-off-by: Ma Shimiao <[email protected]>

Author: Ma Shimiao

cmd/ocitools/validate.go

@@ -337,6 +337,17 @@ func checkLinux(spec rspec.Spec, rootfs string, hostCheck bool) (msgs []string)
 			} else if spec.Linux.Namespaces[index].Type == rspec.MountNamespace {
 				mountExists = true
 			}
+		} else {
+			if hostCheck {
+				_, err := os.Stat(spec.Linux.Namespaces[index].Path)
+				if err != nil {
+					if os.IsNotExist(err) {
+						msgs = append(msgs, fmt.Sprintf("Path of %v not exist", spec.Linux.Namespaces[index].Type))
+					} else {
+						msgs = append(msgs, fmt.Sprintf("%v is invalid: %s", spec.Linux.Namespaces[index].Type, err.Error()))
+					}
+				}
+			}
 		}
 	}