packer-cn/builder/vmware/common/host_ip_vmnetnatconf.go

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package common
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"regexp"
"strings"
)
// VMnetNatConfIPFinder finds the IP address of the host machine by
// retrieving the IP from the vmnetnat.conf. This isn't a full proof
// technique but so far it has not failed.
type VMnetNatConfIPFinder struct{}
func (*VMnetNatConfIPFinder) HostIP() (string, error) {
driver := &Workstation9Driver{}
vmnetnat := driver.VmnetnatConfPath()
if vmnetnat == "" {
return "", errors.New("Could not find NAT vmnet conf file")
}
if _, err := os.Stat(vmnetnat); err != nil {
return "", fmt.Errorf("Could not find NAT vmnet conf file: %s", vmnetnat)
}
f, err := os.Open(vmnetnat)
if err != nil {
return "", err
}
defer f.Close()
ipRe := regexp.MustCompile(`^\s*ip\s*=\s*(.+?)\s*$`)
r := bufio.NewReader(f)
for {
line, err := r.ReadString('\n')
if line != "" {
matches := ipRe.FindStringSubmatch(line)
if matches != nil {
ip := matches[1]
dotIndex := strings.LastIndex(ip, ".")
if dotIndex == -1 {
continue
}
ip = ip[0:dotIndex] + ".1"
return ip, nil
}
}
if err == io.EOF {
break
}
if err != nil {
return "", err
}
}
return "", errors.New("host IP not found in " + vmnetnat)
}