daemon: start daemon from a powershell script that hides window

after windows terminal became the default terminal/console host on
windows the daemon scheduled task would show a console window upon
running as its not recognizing the powershell cmdline argument for
hiding the window

this powershell script hides the window by using win32 api from
powershell

fixes #3726

pkg/crc/preflight/preflight_daemon_task_check_windows.go

@@ -7,11 +7,13 @@ import (
 	"fmt"
 	"os"
 	"os/user"
+	"path/filepath"
 	"strings"
 
 	"github.com/crc-org/crc/pkg/crc/constants"
 	"github.com/crc-org/crc/pkg/crc/logging"
 	"github.com/crc-org/crc/pkg/crc/version"
+	crcos "github.com/crc-org/crc/pkg/os"
 	"github.com/crc-org/crc/pkg/os/windows/powershell"
 )
 
@@ -51,6 +53,43 @@ var (
 </Task>
 `
 	errOlderVersion = fmt.Errorf("expected %s task to be on version '%s'", constants.DaemonTaskName, version.GetCRCVersion())
+
+	daemonPoshScriptTemplate = `# Following script is from https://stackoverflow.com/a/74976541
+function Hide-ConsoleWindow() {
+  $ShowWindowAsyncCode = '[DllImport("user32.dll")] public static extern bool ShowWindowAsync(IntPtr hWnd, int nCmdShow);'
+  $ShowWindowAsync = Add-Type -MemberDefinition $ShowWindowAsyncCode -name Win32ShowWindowAsync -namespace Win32Functions -PassThru
+
+  $hwnd = (Get-Process -PID $pid).MainWindowHandle
+  if ($hwnd -ne [System.IntPtr]::Zero) {
+    # When you got HWND of the console window:
+    # (It would appear that Windows Console Host is the default terminal application)
+    $ShowWindowAsync::ShowWindowAsync($hwnd, 0)
+  } else {
+    # When you failed to get HWND of the console window:
+    # (It would appear that Windows Terminal is the default terminal application)
+
+    # Mark the current console window with a unique string.
+    $UniqueWindowTitle = New-Guid
+    $Host.UI.RawUI.WindowTitle = $UniqueWindowTitle
+    $StringBuilder = New-Object System.Text.StringBuilder 1024
+
+    # Search the process that has the window title generated above.
+    $TerminalProcess = (Get-Process | Where-Object { $_.MainWindowTitle -eq $UniqueWindowTitle })
+    # Get the window handle of the terminal process.
+    # Note that GetConsoleWindow() in Win32 API returns the HWND of
+    # powershell.exe itself rather than the terminal process.
+    # When you call ShowWindowAsync(HWND, 0) with the HWND from GetConsoleWindow(),
+    # the Windows Terminal window will be just minimized rather than hidden.
+    $hwnd = $TerminalProcess.MainWindowHandle
+    if ($hwnd -ne [System.IntPtr]::Zero) {
+      $ShowWindowAsync::ShowWindowAsync($hwnd, 0)
+    } else {
+      Write-Host "Failed to hide the console window."
+    }
+  }
+}
+Hide-ConsoleWindow
+%s`
 )
 
 func genDaemonTaskInstallTemplate(crcVersion, userName, daemonCommand string) (string, error) {
@@ -83,12 +122,7 @@ func fixDaemonTaskInstalled() error {
 	if err := removeDaemonTask(); err != nil {
 		return err
 	}
-	// prepare the task script
-	binPath, err := os.Executable()
-	if err != nil {
-		return fmt.Errorf("unable to find the current executable location: %v", err)
-	}
-	binPathWithArgs := fmt.Sprintf("& '%s' daemon", binPath)
+	binPathWithArgs := fmt.Sprintf("& '%s'", daemonPoshScriptPath)
 	// Get current user along with domain
 	u, err := user.Current()
 	if err != nil {
@@ -170,3 +204,28 @@ func checkIfOlderTask() error {
 	}
 	return nil
 }
+
+var daemonPoshScriptPath = filepath.Join(constants.CrcBinDir, "hidden_daemon.ps1")
+
+func getDaemonPoshScriptContent() []byte {
+	binPath, err := os.Executable()
+	if err != nil {
+		return []byte{}
+	}
+	daemonCmd := fmt.Sprintf("%s daemon --log-level debug", binPath)
+	return []byte(fmt.Sprintf(daemonPoshScriptTemplate, daemonCmd))
+}
+
+func checkDaemonPoshScript() error {
+	if exists := crcos.FileExists(daemonPoshScriptPath); exists {
+		// check the script contains the path to the current executable
+		if err := crcos.FileContentMatches(daemonPoshScriptPath, getDaemonPoshScriptContent()); err == nil {
+			return nil
+		}
+	}
+	return fmt.Errorf("Powershell script for running the daemon does not exist")
+}
+
+func fixDaemonPoshScript() error {
+	return os.WriteFile(daemonPoshScriptPath, getDaemonPoshScriptContent(), 0600)
+}

pkg/crc/preflight/preflight_windows.go

@@ -92,6 +92,17 @@ var vsockChecks = []Check{
 }
 
 var daemonTaskChecks = []Check{
+	{
+		configKeySuffix:    "check-daemon-task-posh-script-present",
+		checkDescription:   "Checking if the daemon task powershell script is present",
+		check:              checkDaemonPoshScript,
+		fixDescription:     "Creating the daemon task powershell script",
+		fix:                fixDaemonPoshScript,
+		cleanupDescription: "Removing the daemon task powershell script",
+		cleanup:            func() error { return os.Remove(daemonPoshScriptPath) },
+
+		labels: labels{Os: Windows},
+	},
 	{
 		configKeySuffix:    "check-daemon-task-install",
 		checkDescription:   "Checking if the daemon task is installed",

pkg/crc/preflight/preflight_windows_test.go

@@ -13,13 +13,13 @@ import (
 func TestCountConfigurationOptions(t *testing.T) {
 	cfg := config.New(config.NewEmptyInMemoryStorage(), config.NewEmptyInMemorySecretStorage())
 	RegisterSettings(cfg)
-	assert.Len(t, cfg.AllConfigs(), 13)
+	assert.Len(t, cfg.AllConfigs(), 14)
 }
 
 func TestCountPreflights(t *testing.T) {
-	assert.Len(t, getPreflightChecks(false, network.SystemNetworkingMode, constants.GetDefaultBundlePath(preset.OpenShift), preset.OpenShift), 20)
-	assert.Len(t, getPreflightChecks(true, network.SystemNetworkingMode, constants.GetDefaultBundlePath(preset.OpenShift), preset.OpenShift), 20)
+	assert.Len(t, getPreflightChecks(false, network.SystemNetworkingMode, constants.GetDefaultBundlePath(preset.OpenShift), preset.OpenShift), 21)
+	assert.Len(t, getPreflightChecks(true, network.SystemNetworkingMode, constants.GetDefaultBundlePath(preset.OpenShift), preset.OpenShift), 21)
 
-	assert.Len(t, getPreflightChecks(false, network.UserNetworkingMode, constants.GetDefaultBundlePath(preset.OpenShift), preset.OpenShift), 19)
-	assert.Len(t, getPreflightChecks(true, network.UserNetworkingMode, constants.GetDefaultBundlePath(preset.OpenShift), preset.OpenShift), 19)
+	assert.Len(t, getPreflightChecks(false, network.UserNetworkingMode, constants.GetDefaultBundlePath(preset.OpenShift), preset.OpenShift), 20)
+	assert.Len(t, getPreflightChecks(true, network.UserNetworkingMode, constants.GetDefaultBundlePath(preset.OpenShift), preset.OpenShift), 20)
 }