qubes.tests.list_templates(), and .close() the app

qubes/tests/__init__.py

@@ -52,6 +52,7 @@ import gc
 import lxml.etree
 import pkg_resources
 
+import qubes
 import qubes.api
 import qubes.api.admin
 import qubes.api.internal
@@ -61,6 +62,7 @@ import qubes.devices
 import qubes.events
 import qubes.exc
 import qubes.vm.standalonevm
+import qubes.vm.templatevm
 
 XMLPATH = '/var/lib/qubes/qubes-test.xml'
 CLASS_XMLPATH = '/var/lib/qubes/qubes-class-test.xml'
@@ -992,6 +994,22 @@ class SystemTestCase(QubesTestCase):
             timeout=30)
 
 
+_templates = None
+def list_templates():
+    '''Returns tuple of template names available in the system.'''
+    global _templates
+    if _templates is None:
+        try:
+            app = qubes.Qubes()
+            _templates = tuple(vm.name for vm in app.domains
+                if isinstance(vm, qubes.vm.templatevm.TemplateVM))
+            app.close()
+            del app
+        except OSError:
+            _templates = ()
+    return _templates
+
+
 def load_tests(loader, tests, pattern): # pylint: disable=unused-argument
     # discard any tests from this module, because it hosts base classes
     tests = unittest.TestSuite()

qubes/tests/extra.py

@@ -23,7 +23,6 @@ import sys
 import pkg_resources
 import qubes.tests
 import qubes.vm.appvm
-import qubes.vm.templatevm
 
 
 class ExtraTestCase(qubes.tests.SystemTestCase):
@@ -80,18 +79,11 @@ def load_tests(loader, tests, pattern):
                 {entry.name: runTest})
             tests.addTest(ExtraLoadFailure(entry.name))
 
-    try:
-        app = qubes.Qubes()
-        templates = [vm.name for vm in app.domains if
-                     isinstance(vm, qubes.vm.templatevm.TemplateVM)]
-    except OSError:
-        templates = []
-
     for entry in pkg_resources.iter_entry_points(
             'qubes.tests.extra.for_template'):
         try:
             for test_case in entry.load()():
-                for template in templates:
+                for template in qubes.tests.list_templates():
                     tests.addTests(loader.loadTestsFromTestCase(
                         type(
                             '{}_{}_{}'.format(

qubes/tests/integ/backup.py

@@ -541,13 +541,7 @@ class TC_10_BackupVMMixin(BackupTestsMixin):
 
 
 def load_tests(loader, tests, pattern):
-    try:
-        app = qubes.Qubes()
-        templates = [vm.name for vm in app.domains if
-                     isinstance(vm, qubes.vm.templatevm.TemplateVM)]
-    except OSError:
-        templates = []
-    for template in templates:
+    for template in qubes.tests.list_templates():
         tests.addTests(loader.loadTestsFromTestCase(
             type(
                 'TC_10_BackupVM_' + template,

qubes/tests/integ/dispvm.py

@@ -19,13 +19,15 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #
 
-from distutils import spawn
-import qubes.tests
+import os
 import subprocess
 import tempfile
-import unittest
-import os
 import time
+import unittest
+
+from distutils import spawn
+
+import qubes.tests
 
 class TC_04_DispVM(qubes.tests.SystemTestCase):
 
@@ -254,13 +256,7 @@ class TC_20_DispVMMixin(object):
         self.assertEqual(test_txt_content, b"Test test 2\ntest1\n")
 
 def load_tests(loader, tests, pattern):
-    try:
-        app = qubes.Qubes()
-        templates = [vm.name for vm in app.domains if
-                     isinstance(vm, qubes.vm.templatevm.TemplateVM)]
-    except OSError:
-        templates = []
-    for template in templates:
+    for template in qubes.tests.list_templates():
         tests.addTests(loader.loadTestsFromTestCase(
             type(
                 'TC_20_DispVM_' + template,

qubes/tests/integ/dom0_update.py

@@ -26,6 +26,7 @@ import tempfile
 import unittest
 
 import qubes
+import qubes.tests
 
 VM_PREFIX = "test-"
 
@@ -359,13 +360,7 @@ Test package
 
 
 def load_tests(loader, tests, pattern):
-    try:
-        app = qubes.Qubes()
-        templates = [vm.name for vm in app.domains if
-                     isinstance(vm, qubes.vm.templatevm.TemplateVM)]
-    except OSError:
-        templates = []
-    for template in templates:
+    for template in qubes.tests.list_templates():
         tests.addTests(loader.loadTestsFromTestCase(
             type(
                 'TC_00_Dom0Upgrade_' + template,

qubes/tests/integ/network.py

@@ -934,13 +934,7 @@ SHA256:
             '{}: {}\n{}'.format(self.update_cmd, stdout, stderr))
 
 def load_tests(loader, tests, pattern):
-    try:
-        app = qubes.Qubes()
-        templates = [vm.name for vm in app.domains if
-                     isinstance(vm, qubes.vm.templatevm.TemplateVM)]
-    except OSError:
-        templates = []
-    for template in templates:
+    for template in qubes.tests.list_templates():
         tests.addTests(loader.loadTestsFromTestCase(
             type(
                 'VmNetworking_' + template,

qubes/tests/integ/vm_qrexec_gui.py

@@ -25,6 +25,7 @@ import multiprocessing
 import os
 import subprocess
 import unittest
+
 from distutils import spawn
 
 import qubes.config
@@ -1001,13 +1002,7 @@ class TC_10_Generic(qubes.tests.SystemTestCase):
 
 
 def load_tests(loader, tests, pattern):
-    try:
-        app = qubes.Qubes()
-        templates = [vm.name for vm in app.domains if
-                     isinstance(vm, qubes.vm.templatevm.TemplateVM)]
-    except OSError:
-        templates = []
-    for template in templates:
+    for template in qubes.tests.list_templates():
         tests.addTests(loader.loadTestsFromTestCase(
             type(
                 'TC_00_AppVM_' + template,