mirror of https://github.com/etcd-io/dbtester.git
117 lines
2.6 KiB
Go
117 lines
2.6 KiB
Go
// Copyright 2017 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package ntp syncs system time with NTP server.
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package ntp
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"os/exec"
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"strings"
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)
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var (
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DefaultNTP = "/usr/sbin/ntpdate"
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DefaultServer = "time.nist.gov"
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)
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// DefaultSync syncs system time with NTP server.
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func DefaultSync() (string, error) {
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return Sync(DefaultNTP, DefaultServer)
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}
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var inUseErr = "NTP socket is in use"
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// Sync syncs system time with NTP server.
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//
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// sudo service ntp stop
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// sudo ntpdate time.nist.gov
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// sudo service ntp start
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//
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func Sync(ntpPath string, server string) (string, error) {
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buf := new(bytes.Buffer)
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err := startNTP(ntpPath, server, buf)
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o := strings.TrimSpace(buf.String())
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if err == nil && strings.Contains(o, "adjust time server") {
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return o, nil
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}
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if !strings.Contains(o, inUseErr) && (err != nil && !strings.Contains(err.Error(), inUseErr)) {
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return o, err
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}
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so, err := serviceNTP("stop")
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if err != nil {
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return so, err
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}
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buf.Reset()
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err = startNTP(ntpPath, server, buf)
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o = strings.TrimSpace(buf.String())
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if err != nil {
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return o, err
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}
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so, err = serviceNTP("start")
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if err != nil {
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return so, err
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}
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if so != "" {
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o += ";" + so
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}
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return o, nil
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}
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func startNTP(ntpPath string, server string, w io.Writer) error {
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if !exist(ntpPath) {
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return fmt.Errorf("%q does not exist", ntpPath)
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}
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cmd := exec.Command("sudo", ntpPath, server)
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cmd.Stdout = w
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cmd.Stderr = w
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return cmd.Run()
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}
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// when 'NTP socket is in use' error is returned
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func serviceNTP(command string) (string, error) {
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buf := new(bytes.Buffer)
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cmd := exec.Command("sudo", "service", "ntp", command)
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cmd.Stdout = buf
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cmd.Stderr = buf
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err := cmd.Run()
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return strings.TrimSpace(buf.String()), err
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}
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// exist returns true if the file or directory exists.
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func exist(fpath string) bool {
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st, err := os.Stat(fpath)
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if err != nil {
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if os.IsNotExist(err) {
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return false
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}
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}
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if st.IsDir() {
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return true
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}
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if _, err := os.Stat(fpath); err != nil {
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if os.IsNotExist(err) {
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return false
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}
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}
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return true
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}
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