qubes/tests/run: refuse to run tests if qubesd is running

Test suite creates some VMs and needs to pass the knowledge about them
to qrexec policy checker. This is done using Admin API, so we need to
substitute qubesd with our own API server.

qubes/tests/run.py

@@ -32,6 +32,7 @@
 import unittest.signals
 
 import qubes.tests
+import qubes.api.admin
 
 class CursesColor(dict):
     colors = (
@@ -331,6 +332,11 @@ def test_6_unexpected_success(self):
     action='store_false', dest='kmsg',
     help='do not abuse kernel ring-buffer')
 
+parser.add_argument('--allow-running-along-qubesd',
+    action='store_true', default=False,
+    help='allow running in parallel with qubesd;'
+        ' this is DANGEROUS and WILL RESULT IN INCONSISTENT SYSTEM STATE')
+
 parser.add_argument('names', metavar='TESTNAME',
     action='store', nargs='*',
     help='list of tests to run named like in description '
@@ -406,6 +412,10 @@ def main():
             ha_kmsg.setLevel(logging.CRITICAL)
             logging.root.addHandler(ha_kmsg)
 
+    if not args.allow_running_along_qubesd \
+    and os.path.exists(qubes.api.admin.QUBESD_ADMIN_SOCK):
+        parser.error('refusing to run until qubesd is disabled')
+
     runner = unittest.TextTestRunner(stream=sys.stdout,
         verbosity=(args.verbose-args.quiet),
         failfast=args.failfast)