Add 'start sys-usb' if sys-usb is not running to qui-devices

fixes QubesOS/qubes-issues#7612

Author: marmarta

qui/devices/actionable_widgets.py

@@ -361,6 +361,22 @@ async def widget_action(self, *_args):
         )
 
 
+#### Start sys-usb
+
+
+class StartSysUsb(ActionableWidget, SimpleActionWidget):
+    def __init__(self, sysusb: backend.VM, variant: str = "dark"):
+        super().__init__(
+            icon_name=sysusb.icon_name,
+            text="<b>List USB Devices " "(start sys-usb)</b>",
+            variant=variant,
+        )
+        self.sysusb = sysusb
+
+    async def widget_action(self, *_args):
+        self.sysusb.vm_object.start()
+
+
 #### Configuration-related actions
 
 

qui/devices/backend.py

@@ -50,6 +50,8 @@ def __init__(self, vm: qubesadmin.vm.QubesVM):
         self._vm = vm
         self.name = vm.name
         self.vm_class = vm.klass
+        self.is_running = True  # in most cases, this is just True, unless we're at
+        # sysusb
 
     def __str__(self):
         return self.name

qui/devices/device_widget.py

@@ -243,6 +243,9 @@ def initialize_vm_data(self):
                     self.vms.add(wrapped_vm)
                 if wrapped_vm.is_dispvm_template:
                     self.dispvm_templates.add(wrapped_vm)
+                if vm.name == "sys-usb":
+                    self.sysusb = wrapped_vm
+                    self.sysusb.is_running = vm.is_running()
             except qubesadmin.exc.QubesException:
                 # we don't have access to VM state
                 pass
@@ -424,6 +427,8 @@ def vm_start(self, vm, _event, **_kwargs):
         wrapped_vm = backend.VM(vm)
         if wrapped_vm.is_attachable:
             self.vms.add(wrapped_vm)
+        if wrapped_vm == self.sysusb:
+            self.sysusb.is_running = True
 
         for devclass in DEV_TYPES:
             try:
@@ -437,6 +442,9 @@ def vm_start(self, vm, _event, **_kwargs):
 
     def vm_shutdown(self, vm, _event, **_kwargs):
         wrapped_vm = backend.VM(vm)
+        if wrapped_vm == self.sysusb:
+            self.sysusb.is_running = False
+
         self.vms.discard(wrapped_vm)
         self.dispvm_templates.discard(wrapped_vm)
 
@@ -508,6 +516,14 @@ def show_menu(self, _unused, _event):
 
             menu_items.append(device_item)
 
+        if not self.sysusb.is_running:
+            sysusb_item = actionable_widgets.generate_wrapper_widget(
+                Gtk.MenuItem,
+                "activate",
+                actionable_widgets.StartSysUsb(self.sysusb, theme),
+            )
+            menu_items.append(sysusb_item)
+
         for item in menu_items:
             tray_menu.add(item)