Add Debug Console to Qui Domains systray widget

fixes: QubesOS/qubes-issues#9788

Author: alimirjamali

qui/tray/domains.py

@@ -52,6 +52,7 @@ def __init__(self):
         self.icon_files = {
             "pause": "qubes-vm-pause",
             "terminal": "qubes-terminal",
+            "debug": "qubes-info",
             "preferences": "qubes-vm-settings",
             "kill": "qubes-vm-kill",
             "shutdown": "qubes-vm-shutdown",
@@ -316,6 +317,35 @@ async def perform_action(self):
             )
 
 
+class RunDebugConsoleItem(VMActionMenuItem):
+    """Run Debug Console menu Item. When activated runs a qvm-console-dispvm."""
+
+    def __init__(self, vm, icon_cache):
+        super().__init__(
+            vm,
+            label=_("Debug Console"),
+            icon_cache=icon_cache,
+            icon_name="debug",
+        )
+
+    async def perform_action(self, *_args, **_kwargs):
+        try:
+            proc = await asyncio.create_subprocess_exec(
+                "qvm-console-dispvm", self.vm.name, stderr=subprocess.PIPE
+            )
+            _stdout, stderr = await proc.communicate()
+            if proc.returncode != 0:
+                raise exc.QubesException(stderr)
+        except exc.QubesException as ex:
+            show_error(
+                _("Error starting debug console"),
+                _(
+                    "The following error occurred while attempting to start"
+                    "debug console for qube {0}:\n{1}"
+                ).format(self.vm.name, str(ex)),
+            )
+
+
 class OpenFileManagerItem(VMActionMenuItem):
     """Attempts to open a file manager in the VM. If fails, displays an
     error message."""
@@ -368,6 +398,10 @@ def __init__(self, vm, app, icon_cache):
 
         self.add(OpenFileManagerItem(self.vm, icon_cache))
         self.add(RunTerminalItem(self.vm, icon_cache))
+        if self.app.wizard_mode or \
+                not getattr(self.vm, "guivm") or \
+                getattr(self.vm, "debug"):
+            self.add(RunDebugConsoleItem(self.vm, icon_cache))
         self.add(PreferencesItem(self.vm, icon_cache))
         self.add(PauseItem(self.vm, icon_cache))
         self.add(ShutdownItem(self.vm, icon_cache))
@@ -668,6 +702,11 @@ def __init__(self, app_name, qapp, dispatcher, stats_dispatcher):
         self.set_application_id(app_name)
         self.register()  # register Gtk Application
 
+        # to display debug console for all qubes
+        self.wizard_mode = self.qapp.domains["dom0"].features.get(
+            "wizard-mode", False
+        )
+
     def register_events(self):
         self.dispatcher.add_handler("connection-established", self.refresh_all)
         self.dispatcher.add_handler("domain-pre-start", self.update_domain_item)