fix(void): updated dms-greeter stability support

- Updates will land in DMS v1.5.1 and users are advised to hold off on v1.5.0

Related #2788

Port 1.5

core/cmd/dms/commands_greeter.go

@@ -1081,8 +1081,11 @@ func ensureGreetdEnabled() error {
 		if !runitServiceInstalled("greetd") {
 			return fmt.Errorf("greetd service not found in %s. Please install greetd first", runitSvDir)
 		}
-		// Seat + runtime-dir setup that logind handles automatically on systemd.
-		ensureRunitSeat("_greeter")
+		if greeter.IsVoidLinux() {
+			ensureVoidLogindGreeter("_greeter")
+		} else {
+			ensureRunitSeat("_greeter")
+		}
 		ensureGreetdPamRundir()
 		if err := enableRunitService("greetd"); err != nil {
 			return fmt.Errorf("failed to enable greetd: %w", err)
@@ -1261,6 +1264,9 @@ func enableGreeter(nonInteractive bool) error {
 		if err := greeter.EnsureGreeterCacheDir(logFunc, ""); err != nil {
 			fmt.Printf("⚠ Could not ensure cache directory: %v\n  Run: sudo mkdir -p %s && sudo chown root:%s %s && sudo chmod 2770 %s\n", err, greeter.GreeterCacheDir, greeterGroup, greeter.GreeterCacheDir, greeter.GreeterCacheDir)
 		}
+		if err := greeter.EnsureVoidLogindGreetdCommand(logFunc, ""); err != nil {
+			return err
+		}
 
 		if err := ensureGraphicalTarget(); err != nil {
 			return err
@@ -1475,12 +1481,23 @@ func extractGreeterWrapperFromCommand(command string) string {
 	if len(tokens) == 0 {
 		return ""
 	}
-	wrapper := strings.Trim(tokens[0], "\"")
+	wrapperIndex := 0
+	if filepath.Base(strings.Trim(tokens[0], "\"")) == "env" {
+		wrapperIndex = 1
+		for wrapperIndex < len(tokens) && strings.Contains(tokens[wrapperIndex], "=") {
+			wrapperIndex++
+		}
+	}
+	if wrapperIndex >= len(tokens) {
+		return ""
+	}
+
+	wrapper := strings.Trim(tokens[wrapperIndex], "\"")
 	if wrapper == "" {
 		return ""
 	}
-	if len(tokens) > 1 {
-		next := strings.Trim(tokens[1], "\"")
+	if wrapperIndex+1 < len(tokens) {
+		next := strings.Trim(tokens[wrapperIndex+1], "\"")
 		if next != "" && (filepath.Base(wrapper) == "bash" || filepath.Base(wrapper) == "sh") && strings.Contains(filepath.Base(next), "dms-greeter") {
 			return fmt.Sprintf("%s (script: %s)", wrapper, next)
 		}

core/cmd/dms/commands_greeter_test.go

@@ -101,6 +101,13 @@ func TestGreeterStatusStateDirHonorsExplicitOverrideOnNixOS(t *testing.T) {
 	}
 }
 
+func TestExtractGreeterWrapperFromEnvCommand(t *testing.T) {
+	command := "env LIBSEAT_BACKEND=logind DMS_VOID=1 /usr/bin/dms-greeter --command niri"
+	if got := extractGreeterWrapperFromCommand(command); got != "/usr/bin/dms-greeter" {
+		t.Fatalf("extractGreeterWrapperFromCommand() = %q, want %q", got, "/usr/bin/dms-greeter")
+	}
+}
+
 func TestRejectNixOSGreeterMutationBlocksImperativeCommands(t *testing.T) {
 	origGreeterIsNixOSFn := greeterIsNixOSFn
 	greeterIsNixOSFn = func() bool { return true }

core/cmd/dms/init_service.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"strings"
 
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/greeter"
 	"github.com/AvengeMedia/DankMaterialShell/core/internal/privesc"
 )
 
@@ -83,9 +84,31 @@ func ensureRunitSeat(greeterUser string) {
 	}
 }
 
-// ensureGreetdPamRundir adds pam_rundir to the greetd PAM stack so the post-login
-// session gets an XDG_RUNTIME_DIR on systems without logind (Void with seatd).
-// Appended outside DMS's managed auth block so it survives `dms greeter sync`.
+// ensureVoidLogindGreeter configures the elogind-backed greeter on Void.
+func ensureVoidLogindGreeter(greeterUser string) {
+	for _, service := range []string{"dbus", "elogind"} {
+		if err := enableRunitService(service); err != nil {
+			fmt.Printf("  ⚠ could not enable %s: %v\n", service, err)
+		} else {
+			fmt.Printf("  ✓ %s enabled\n", service)
+		}
+	}
+	greeter.EnsureVoidGreetdRunScript(func(msg string) { fmt.Println("  " + msg) }, "")
+	if runitServiceEnabled("seatd") {
+		if err := disableRunitService("seatd"); err != nil {
+			fmt.Printf("  ⚠ could not disable seatd: %v\n", err)
+		} else {
+			fmt.Println("  ✓ seatd disabled (elogind manages the seat)")
+		}
+	}
+	if err := privesc.Run(context.Background(), "", "usermod", "-aG", "video,input", greeterUser); err != nil {
+		fmt.Printf("  ⚠ could not add %s to video/input groups: %v\n", greeterUser, err)
+	} else {
+		fmt.Printf("  ✓ %s added to video/input groups (elogind manages the seat)\n", greeterUser)
+	}
+}
+
+// ensureGreetdPamRundir provides XDG_RUNTIME_DIR to runit greeter sessions.
 func ensureGreetdPamRundir() {
 	const pamPath = "/etc/pam.d/greetd"
 	data, err := os.ReadFile(pamPath)