Issue #8 Add powershell and shellexecute logic

pkg/os/windows/powershell/powershell_windows.go

@@ -0,0 +1,85 @@
+package powershell
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+	"syscall"
+
+	"os/exec"
+)
+
+var (
+	runAsCmds = []string{
+		`$myWindowsID = [System.Security.Principal.WindowsIdentity]::GetCurrent();`,
+		`$myWindowsPrincipal = New-Object System.Security.Principal.WindowsPrincipal($myWindowsID);`,
+		`$adminRole = [System.Security.Principal.WindowsBuiltInRole]::Administrator;`,
+		`if (-Not ($myWindowsPrincipal.IsInRole($adminRole))) {`,
+		`  $procInfo = New-Object System.Diagnostics.ProcessStartInfo;`,
+		`  $procInfo.FileName = "` + locatePowerShell() + `"`,
+		`  $procInfo.WindowStyle = [Diagnostics.ProcessWindowStyle]::Hidden`,
+		`  $procInfo.Arguments = "& '" + $script:MyInvocation.MyCommand.Path + "'"`,
+		`  $procInfo.Verb = "runas";`,
+		`  [System.Diagnostics.Process]::Start($procInfo);`,
+		`  Exit;`,
+		`}`,
+	}
+	isAdminCmds = []string{
+		"$currentPrincipal = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())",
+		"$currentPrincipal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)",
+	}
+)
+
+func locatePowerShell() string {
+	ps, _ := exec.LookPath("powershell.exe")
+	return ps
+}
+
+func IsAdmin() bool {
+	cmd := strings.Join(isAdminCmds, ";")
+	stdOut, _, err := Execute(cmd)
+	if err != nil {
+		return false
+	}
+	if strings.TrimSpace(stdOut) == "False" {
+		return false
+	}
+
+	return true
+}
+
+func Execute(args ...string) (stdOut string, stdErr string, err error) {
+	args = append([]string{"-NoProfile", "-NonInteractive", "-ExecutionPolicy", "RemoteSigned", "-Command"}, args...)
+	cmd := exec.Command(locatePowerShell(), args...)
+	cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
+
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+
+	err = cmd.Run()
+	stdOut, stdErr = stdout.String(), stderr.String()
+
+	return
+}
+
+func ExecuteAsAdmin(cmd string) (stdOut string, stdErr string, err error) {
+	scriptContent := strings.Join(append(runAsCmds, cmd), "\n")
+
+	tempDir, _ := ioutil.TempDir("", "crcScripts")
+	psFile, err := os.Create(filepath.Join(tempDir, "runAsAdmin.ps1"))
+	if err != nil {
+		return "", "", err
+	}
+
+	// Write a temporary script
+	psFile.WriteString(scriptContent)
+	psFile.Close()
+
+	return Execute(psFile.Name())
+
+	// TODO: cleanup the mess
+}

pkg/os/windows/win32/shell32_windows.go

@@ -0,0 +1,43 @@
+package win32
+
+import (
+	"syscall"
+	"unsafe"
+
+	"github.com/code-ready/crc/pkg/crc/errors"
+)
+
+var (
+	shell32Lib       = syscall.NewLazyDLL("shell32.dll")
+	procShellExecute = shell32Lib.NewProc("ShellExecuteW")
+)
+
+// Uses "runas" as verb to execute as Elevated privileges
+func ShellExecuteAsAdmin(hwnd HWND, file, parameters, directory string, showCmd int) error {
+	return ShellExecute(hwnd, "runas", file, parameters, directory, showCmd)
+}
+
+func toUintptr(input string) uintptr {
+	return uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(input)))
+}
+
+func ShellExecute(hwnd HWND, verb, file, parameters, directory string, showCmd int) error {
+	var op, params, dir uintptr
+	if len(verb) != 0 {
+		op = toUintptr(verb)
+	}
+	if len(parameters) != 0 {
+		params = toUintptr(parameters)
+	}
+	if len(directory) != 0 {
+		dir = toUintptr(directory)
+	}
+
+	ret, _, _ := procShellExecute.Call(uintptr(hwnd), op, toUintptr(file), params, dir, uintptr(showCmd))
+
+	if ret == 0 {
+		return nil
+	}
+
+	return errors.Newf("win32 error %v", ret)
+}

pkg/os/windows/win32/types_windows.go

@@ -0,0 +1,10 @@
+package win32
+
+type (
+	HANDLE uintptr
+	HWND   HANDLE
+)
+
+const (
+	HWND_DESKTOP = HWND(0)
+)