Add preloaded disposable icon to state column

Fixes: QubesOS/qubes-issues#10639
For: QubesOS/qubes-issues#1512

Author: ben-grande

icons/scalable/qubes-preloaded.svg

@@ -53,6 +53,7 @@ def __init__(self, vm):
 
             self.updates_available = False
             self.outdated = False
+            self.is_preload = False
 
             self.label = Gtk.Label(xalign=0)
             if self.vm:
@@ -63,20 +64,42 @@ def __init__(self, vm):
 
             self.outdated_icon = create_icon("outdated")
             self.updateable_icon = create_icon("software-update-available")
+            self.preload_icon = create_icon("qubes-preloaded")
 
             self.outdated_icon.set_no_show_all(True)
             self.updateable_icon.set_no_show_all(True)
+            self.preload_icon.set_no_show_all(True)
 
             self.updateable_icon.set_tooltip_text(_("Updates available"))
             self.outdated_icon.set_tooltip_text(
                 _("Qube must be restarted to reflect changes in template")
             )
+            self.preload_icon.set_tooltip_text(
+                _(
+                    "Preloaded disposable qube\n\nTo configure memory usage of "
+                    "these qubes, see Qubes Global Config"
+                )
+            )
 
             self.update_outdated(False)
             self.update_updateable()
+            self.update_preload()
 
             self.pack_start(self.outdated_icon, False, False, 3)
             self.pack_start(self.updateable_icon, False, True, 3)
+            self.pack_start(self.preload_icon, False, False, 3)
+
+        def update_preload(self):
+            if self.vm is None:
+                return
+            try:
+                is_preload = getattr(self.vm, "is_preload", False)
+            except exc.QubesException:
+                # no access to VM features
+                is_preload = False
+            self.preload_icon.set_visible(is_preload)
+            self.is_preload = is_preload
+            self.update_tooltip()
 
         def update_outdated(self, state):
             self.outdated_icon.set_visible(state)

qui/decorators.py

@@ -1139,6 +1139,9 @@ def update_domain_item(self, vm, event, **kwargs):
 
         item.update_state(state)
 
+        if event == "property-reset:is_preload":
+            item.name.update_preload()
+
         if event == "domain-shutdown":
             self.handle_domain_shutdown(vm)
             # if the VM was shut down, it is no longer outdated

qui/tray/domains.py

@@ -318,6 +318,7 @@ gtk-update-icon-cache %{_datadir}/icons/Adwaita &>/dev/null || :
 /usr/share/icons/hicolor/scalable/apps/qubes-ok.svg
 /usr/share/icons/hicolor/scalable/apps/qubes-padlock.svg
 /usr/share/icons/hicolor/scalable/apps/qubes-policy-editor.svg
+/usr/share/icons/hicolor/scalable/apps/qubes-preloaded.svg
 /usr/share/icons/hicolor/scalable/apps/qubes-question.svg
 /usr/share/icons/hicolor/scalable/apps/qubes-this-device.svg
 /usr/share/icons/hicolor/scalable/apps/qubes-unplug.svg