forked from cockroachdb/cockroach
/
ssh.go
70 lines (62 loc) · 1.63 KB
/
ssh.go
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// Copyright 2015 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.
//
// Author: Tobias Schottdorf
package cluster
import (
"bytes"
"io/ioutil"
"golang.org/x/crypto/ssh"
)
func loadKey(file string) (ssh.AuthMethod, error) {
buffer, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
key, err := ssh.ParsePrivateKey(buffer)
if err != nil {
return nil, err
}
return ssh.PublicKeys(key), nil
}
func execute(user, hostport, keyfile, cmd string) (stdout string, stderr string, _ error) {
keyAuth, err := loadKey(keyfile)
if err != nil {
return "", "", err
}
sshConfig := &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{keyAuth},
}
conn, err := ssh.Dial("tcp", hostport, sshConfig)
if err != nil {
return "", "", err
}
defer func() {
_ = conn.Close()
}()
session, err := conn.NewSession()
if err != nil {
return "", "", err
}
defer func() {
_ = session.Close()
}()
var errBuf, outBuf bytes.Buffer
session.Stdout = &outBuf
session.Stderr = &errBuf
err = session.Run(cmd)
return outBuf.String(), errBuf.String(), err
}