packer-cn/builder/vmware/host_ip.go

44 lines
891 B
Go

package vmware
import (
"bytes"
"errors"
"os/exec"
"regexp"
)
// Interface to help find the host IP that is available from within
// the VMware virtual machines.
type HostIPFinder interface {
HostIP() (string, error)
}
// IfconfigIPFinder finds the host IP based on the output of `ifconfig`.
type IfconfigIPFinder struct {
Device string
}
func (f *IfconfigIPFinder) HostIP() (string, error) {
ifconfigPath, err := exec.LookPath("ifconfig")
if err != nil {
return "", err
}
stdout := new(bytes.Buffer)
cmd := exec.Command(ifconfigPath, f.Device)
cmd.Stdout = stdout
cmd.Stderr = new(bytes.Buffer)
if err := cmd.Run(); err != nil {
return "", err
}
re := regexp.MustCompile(`inet\s*(?:addr:)?(.+?)\s`)
matches := re.FindStringSubmatch(stdout.String())
if matches == nil {
return "", errors.New("IP not found in ifconfig output...")
}
return matches[1], nil
}