1 // Copyright 2021 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package membership 16 17 import ( 18 "go.etcd.io/etcd/server/v3/etcdserver/api/v2store" 19 ) 20 21 // IsMetaStoreOnly verifies if the given `store` contains only 22 // a meta-information (members, version) that can be recovered from the 23 // backend (storev3) as well as opposed to user-data. 24 func IsMetaStoreOnly(store v2store.Store) (bool, error) { 25 event, err := store.Get("/", true, false) 26 if err != nil { 27 return false, err 28 } 29 for _, n := range event.Node.Nodes { 30 if n.Key != storePrefix && n.Nodes.Len() > 0 { 31 return false, nil 32 } 33 } 34 35 return true, nil 36 } 37