Fixed grey label color value causing accidental green icons

fixes QubesOS/qubes-issues#3471

qubes/app.py

@@ -981,6 +981,16 @@ class Qubes(qubes.PropertyHolder):
                 pass
             node_default_fw_netvm.getparent().remove(node_default_fw_netvm)
 
+    def _migrate_labels(self):
+        """Migrate changed labels"""
+        if self.xml is None:
+            return
+
+        # fix grey being green
+        grey_label = self.xml.find('./labels/label[@color=\'0x555753\']')
+        if grey_label is not None:
+            grey_label.set('color', '0x555555')
+
     def load(self, lock=False):
         """Open qubes.xml
 
@@ -992,6 +1002,8 @@ class Qubes(qubes.PropertyHolder):
         fh = self._acquire_lock()
         self.xml = lxml.etree.parse(fh)
 
+        self._migrate_labels()
+
         # stage 1: load labels and pools
         for node in self.xml.xpath('./labels/label'):
             label = qubes.Label.fromxml(node)
@@ -1211,7 +1223,7 @@ class Qubes(qubes.PropertyHolder):
             2: qubes.Label(2, '0xf57900', 'orange'),
             3: qubes.Label(3, '0xedd400', 'yellow'),
             4: qubes.Label(4, '0x73d216', 'green'),
-            5: qubes.Label(5, '0x555753', 'gray'),
+            5: qubes.Label(5, '0x555555', 'gray'),
             6: qubes.Label(6, '0x3465a4', 'blue'),
             7: qubes.Label(7, '0x75507b', 'purple'),
             8: qubes.Label(8, '0x000000', 'black'),

qubes/tests/app.py

@@ -508,6 +508,49 @@ class TC_89_QubesEmpty(qubes.tests.QubesTestCase):
             self.app.close()
             del self.app
 
+    def test_101_property_migrate_label(self):
+        xml_template = """<?xml version="1.0" encoding="utf-8" ?>
+        <qubes version="3.0">
+            <labels>
+                <label id="label-1" color="{old_gray}">gray</label>
+            </labels>
+            <pools>
+              <pool driver="file" dir_path="/tmp/qubes-test" name="default"/>
+            </pools>
+            <domains>
+                <domain class="StandaloneVM" id="domain-1">
+                    <properties>
+                        <property name="qid">1</property>
+                        <property name="name">sys-net</property>
+                        <property name="provides_network">True</property>
+                        <property name="label" ref="label-1" />
+                        <property name="netvm"></property>
+                        <property name="uuid">2fcfc1f4-b2fe-4361-931a-c5294b35edfa</property>
+                    </properties>
+                    <features/>
+                    <devices class="pci"/>
+                </domain>
+            </domains>
+        </qubes>
+        """
+        with self.subTest('replace_label'):
+            with open('/tmp/qubestest.xml', 'w') as xml_file:
+                xml_file.write(xml_template.format(old_gray='0x555753'))
+            self.app = qubes.Qubes('/tmp/qubestest.xml', offline_mode=True)
+            self.assertEqual(
+                self.app.get_label('gray').color, '0x555555')
+            self.app.close()
+            del self.app
+
+        with self.subTest('dont_replace_label'):
+            with open('/tmp/qubestest.xml', 'w') as xml_file:
+                xml_file.write(xml_template.format(old_gray='0x123456'))
+            self.app = qubes.Qubes('/tmp/qubestest.xml', offline_mode=True)
+            self.assertEqual(
+                self.app.get_label('gray').color, '0x123456')
+            self.app.close()
+            del self.app
+
 
 class TC_90_Qubes(qubes.tests.QubesTestCase):
     def tearDown(self):