FIX #2232 Check that the user is an Administrator

Signed-off-by: David Gageot <david@gageot.net>

drivers/hyperv/hyperv.go

@@ -124,15 +124,24 @@ func (d *Driver) GetState() (state.State, error) {
 
 // PreCreateCheck checks that the machine creation process can be started safely.
 func (d *Driver) PreCreateCheck() error {
+	// Check that hyperv is installed
 	if err := hypervAvailable(); err != nil {
 		return err
 	}
 
-	// Check that there is a virtual switch already configured
-	_, err := d.chooseVirtualSwitch()
+	// Check that the user is an Administrator
+	isAdmin, err := isAdministrator()
 	if err != nil {
 		return err
 	}
+	if !isAdmin {
+		return ErrNotAdministrator
+	}
+
+	// Check that there is a virtual switch already configured
+	if _, err := d.chooseVirtualSwitch(); err != nil {
+		return err
+	}
 
 	// Downloading boot2docker to cache should be done here to make sure
 	// that a download failure will not leave a machine half created.

drivers/hyperv/powershell.go

@@ -3,7 +3,7 @@ package hyperv
 import (
 	"bufio"
 	"bytes"
-	"fmt"
+	"errors"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -14,6 +14,11 @@ import (
 
 var powershell string
 
+var (
+	ErrNotAdministrator = errors.New("Hyper-v commands have to be run as an Administrator")
+	ErrNotInstalled     = errors.New("Hyper-V PowerShell Module is not available")
+)
+
 func init() {
 	systemPath := strings.Split(os.Getenv("PATH"), ";")
 	for _, path := range systemPath {
@@ -61,8 +66,18 @@ func hypervAvailable() error {
 
 	resp := parseLines(stdout)
 	if resp[0] != "Hyper-V" {
-		return fmt.Errorf("Hyper-V PowerShell Module is not available")
+		return ErrNotInstalled
 	}
 
 	return nil
 }
+
+func isAdministrator() (bool, error) {
+	stdout, err := cmdOut(`@([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")`)
+	if err != nil {
+		return false, err
+	}
+
+	resp := parseLines(stdout)
+	return resp[0] == "True", nil
+}