Include vendor tmpfiles policies in branding fixtures

tests/test_branding.py

@@ -16,6 +16,14 @@ class BrandingTests(unittest.TestCase):
         (self.root / 'lib/modules' / version).mkdir(parents=True)
         (self.root / 'boot').mkdir()
         (self.root / 'boot' / ('vmlinuz-' + version)).write_text('kernel')
+        tmpfiles = self.root / 'usr/lib/tmpfiles.d'
+        tmpfiles.mkdir(parents=True)
+        for name, content in (
+            ('home.conf', 'Q /home 0755 - - -\nq /srv 0755 - - -\n'),
+            ('portables.conf', 'Q /var/lib/portables 0700\n'),
+            ('systemd-nspawn.conf', 'Q /var/lib/machines 0700 - - -\n'),
+        ):
+            (tmpfiles / name).write_text(content)
 
     def release(self):
         return dict(line.split('=', 1)[0:1] + shlex.split(line.split('=', 1)[1])
@@ -24,7 +32,7 @@ class BrandingTests(unittest.TestCase):
 
     def test_export_brands_derivative_without_rewriting_packaged_gentoo_metadata(self):
         vendor = self.root / 'usr/lib/os-release'
-        vendor.parent.mkdir(parents=True)
+        vendor.parent.mkdir(parents=True, exist_ok=True)
         original = "NAME='Gentoo'\nID=gentoo\nPRETTY_NAME='Gentoo Linux'\nVERSION_ID=2.18\nHOME_URL='https://www.gentoo.org/'\n"
         vendor.write_text(original)
         (self.root / 'etc').mkdir()