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set.go
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set.go
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// Copyright © 2016 Govinda Fichtner <govinda.fichtner@googlemail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package cmd
import (
"fmt"
"github.com/spf13/cobra"
"io/ioutil"
"os/exec"
"strings"
)
// setCmd represents the set command
var setCmd = &cobra.Command{
Use: "set [hostname]",
Short: "Set a hostname",
Long: ``,
Run: func(cmd *cobra.Command, args []string) {
if len(args) > 0 {
set_hostname(args[0])
} else {
cmd.Help()
}
},
}
func init() {
hostnameCmd.AddCommand(setCmd)
}
func set_hostname(args ...string) {
hostname := ""
// if we have hostname in config file use that
if config.IsSet("hostname") {
hostname = config.GetString("hostname")
}
// if we have a hostname as command line arg use that
if len(args) > 0 {
hostname = args[0]
}
if hostname == "" {
fmt.Println("missing hostname argument")
return
}
err := ioutil.WriteFile("/etc/hostname", []byte(hostname), 0644)
if err != nil {
panic(err)
}
input, err := ioutil.ReadFile("/etc/hosts")
if err != nil {
panic(err)
}
lines := strings.Split(string(input), "\n")
for i, line := range lines {
if strings.Contains(line, "127.0.0.1 localhost") {
lines[i] = fmt.Sprintf("127.0.0.1 localhost %s", hostname)
}
}
output := strings.Join(lines, "\n")
err = ioutil.WriteFile("/etc/hosts", []byte(output), 0644)
if err != nil {
panic(err)
}
fmt.Printf("hostname: %s\n", hostname)
set_hostname_cmd := exec.Command("hostname", hostname)
err = set_hostname_cmd.Run()
if err != nil {
panic(err)
}
fmt.Printf("Set hostname: %s\n", hostname)
}