1// Copyright 2016 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// etcdctl is a command line application that controls etcd. 16package main 17 18import ( 19 "fmt" 20 "os" 21 22 "go.etcd.io/etcd/etcdctl/ctlv2" 23 "go.etcd.io/etcd/etcdctl/ctlv3" 24) 25 26const ( 27 apiEnv = "ETCDCTL_API" 28) 29 30func main() { 31 apiv := os.Getenv(apiEnv) 32 // unset apiEnv to avoid side-effect for future env and flag parsing. 33 os.Unsetenv(apiEnv) 34 if len(apiv) == 0 || apiv == "3" { 35 ctlv3.Start() 36 return 37 } 38 39 if apiv == "2" { 40 ctlv2.Start() 41 return 42 } 43 44 fmt.Fprintln(os.Stderr, "unsupported API version", apiv) 45 os.Exit(1) 46} 47