/
hosts.go
180 lines (146 loc) · 3.09 KB
/
hosts.go
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package utils
import (
"fmt"
"io/ioutil"
"os"
"os/exec"
"regexp"
"strings"
"time"
"github.com/johanneswuerbach/nfsexports"
)
type result struct {
value string
err error
}
func GetIP(uuid string) (string, error) {
var ip string
timeout := make(chan bool, 1)
value := make(chan result, 1)
go func() {
time.Sleep(15 * time.Second)
timeout <- true
}()
go func() {
for ip == "" {
time.Sleep(time.Second)
matchRe := regexp.MustCompile(`.*name=([a-fA-F0-9\-]+)\n.*ip_address=([0-9\.]+)`)
file, err := os.Open("/var/db/dhcpd_leases")
if err != nil {
if os.IsNotExist(err) {
continue
}
value <- result{"", err}
return
}
defer file.Close()
leases, err := ioutil.ReadAll(file)
if err != nil {
value <- result{"", err}
return
}
lines := string(leases)
matches := matchRe.FindAllStringSubmatch(lines, -1)
for _, match := range matches {
if match[1] == uuid {
value <- result{match[2], nil}
break
}
}
}
}()
select {
case res := <-value:
return res.value, res.err
case <-timeout:
return "", fmt.Errorf("Failed to find an IP for the virtual machine in 15 seconds")
}
}
func AddHost(hostname, ip string) error {
if hostname == "" {
hostname = "local.docker"
}
ipRe := regexp.MustCompile(`.*# added by dlite$`)
ipLine := ip + " " + hostname + " # added by dlite"
file, err := os.OpenFile("/etc/hosts", os.O_RDWR, 0644)
if err != nil {
return err
}
defer file.Close()
hosts, err := ioutil.ReadAll(file)
if err != nil {
return err
}
lines := strings.Split(string(hosts), "\n")
added := false
for i, line := range lines {
if ipRe.MatchString(line) {
lines[i] = ipLine
added = true
break
}
}
if !added {
lines = append(lines, ipLine)
}
_, err = file.Seek(0, 0)
if err != nil {
return err
}
_, err = file.Write([]byte(strings.Join(lines, "\n") + "\n"))
return err
}
func RemoveHost() error {
ipRe := regexp.MustCompile(`.*# added by dlite$`)
file, err := os.OpenFile("/etc/hosts", os.O_RDWR, 0644)
if err != nil {
return err
}
defer file.Close()
hosts, err := ioutil.ReadAll(file)
if err != nil {
return err
}
lines := strings.Split(string(hosts), "\n")
for i, line := range lines {
if ipRe.MatchString(line) {
lines = append(lines[:i], lines[i+1:]...)
break
}
}
_, err = file.Seek(0, 0)
if err != nil {
return err
}
n, err := file.Write([]byte(strings.Join(lines, "\n")))
if err != nil {
return err
}
return file.Truncate(int64(n))
}
func AddExport(uuid, share string) error {
if share == "" {
share = "/Users"
}
export := fmt.Sprintf("%s -network 192.168.64.0 -mask 255.255.255.0 -alldirs -maproot=root:wheel", share)
_, err := nfsexports.Add("", "dlite", export)
if err != nil {
return err
}
err = nfsexports.ReloadDaemon()
if err != nil {
return exec.Command("sudo", "nfsd", "start").Run()
}
return err
}
func RemoveExport() error {
_, err := nfsexports.Remove("", "dlite")
if err != nil {
return err
}
err = nfsexports.ReloadDaemon()
if err != nil {
return exec.Command("sudo", "nfsd", "start").Run()
}
return err
}