mirror of
https://github.com/k3s-io/kubernetes.git
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60e9fe79af
Adds the following subcommands to the agnhost binary: - dns-server-list: outputs the host's DNS server list with which it was configured with. This can be found in /etc/resolv.conf on Linux and through some powershell commands on Windows. - etc-hosts: outputs the host's hosts file. This can be found in /etc/hosts for Linux, and C:/Windows/System32/drivers/etc/hosts for Windows. - pause: pauses the binary's execution. This can be used to keep the Pod in a Running state for various reasons, including executing additional agnhost commands. Refactors bits of the code to avoid duplication. Adds a README for the agnhost image.
91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package main
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"os/signal"
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"strings"
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"syscall"
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"github.com/spf13/cobra"
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)
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func printDNSSuffixList(cmd *cobra.Command, args []string) {
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dnsSuffixList := getDNSSuffixList()
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fmt.Println(strings.Join(dnsSuffixList, ","))
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}
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func printDNSServerList(cmd *cobra.Command, args []string) {
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dnsServerList := getDNSServerList()
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fmt.Println(strings.Join(dnsServerList, ","))
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}
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func printHostsFile(cmd *cobra.Command, args []string) {
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fmt.Println(readFile(etcHostsFile))
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}
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func pause(cmd *cobra.Command, args []string) {
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sigCh := make(chan os.Signal)
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done := make(chan int, 1)
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signal.Notify(sigCh, syscall.SIGINT)
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signal.Notify(sigCh, syscall.SIGTERM)
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signal.Notify(sigCh, syscall.SIGKILL)
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go func() {
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sig := <-sigCh
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switch sig {
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case syscall.SIGINT:
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done <- 1
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os.Exit(1)
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case syscall.SIGTERM:
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done <- 2
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os.Exit(2)
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case syscall.SIGKILL:
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done <- 0
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os.Exit(0)
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}
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}()
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result := <-done
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fmt.Printf("exiting %d\n", result)
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}
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func readFile(fileName string) string {
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fileData, err := ioutil.ReadFile(fileName)
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if err != nil {
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panic(err)
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}
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return string(fileData)
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}
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func runCommand(name string, arg ...string) string {
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var out bytes.Buffer
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cmd := exec.Command(name, arg...)
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cmd.Stdout = &out
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err := cmd.Run()
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if err != nil {
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panic(err)
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}
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return strings.TrimSpace(out.String())
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}
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