go.etcd.io/etcd@v3.3.27+incompatible/etcdctl/main.go (about)

     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.
    16  package main
    17  
    18  import (
    19  	"fmt"
    20  	"os"
    21  
    22  	"github.com/coreos/etcd/etcdctl/ctlv2"
    23  	"github.com/coreos/etcd/etcdctl/ctlv3"
    24  )
    25  
    26  const (
    27  	apiEnv = "ETCDCTL_API"
    28  )
    29  
    30  func 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 == "2" {
    35  		ctlv2.Start(apiv)
    36  		return
    37  	}
    38  
    39  	if apiv == "3" {
    40  		ctlv3.Start()
    41  		return
    42  	}
    43  
    44  	fmt.Fprintln(os.Stderr, "unsupported API version", apiv)
    45  	os.Exit(1)
    46  }