tests: Add an option for snapshot (default: off)

Not using snapshot has the benefit of automatically persisting useful
test harnesses, such as docker images and ccache database. Although it
will lose some cleanness, it is imaginably useful for patchew.

Signed-off-by: Fam Zheng <[email protected]>
Message-Id: <20180712012829[email protected]>
Tested-by: Philippe Mathieu-Daudé <[email protected]>
Signed-off-by: Fam Zheng <[email protected]>

diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py
index d80cc8ab85b1bb724fd6ba2837f86196e934cae7..1f1579dc9a506e7b7a41f2baa2ea1cbc58e409a6 100755 (executable)
--- a/tests/vm/basevm.py
+++ b/tests/vm/basevm.py
@@ -217,6 +217,8 @@ def parse_args(vm_name):
                       help="build QEMU from source in guest")
     parser.add_option("--interactive", "-I", action="store_true",
                       help="Interactively run command")
+    parser.add_option("--snapshot", "-s", action="store_true",
+                      help="run tests with a snapshot")
     parser.disable_interspersed_args()
     return parser.parse_args()
 
@@ -242,7 +244,10 @@ def main(vmcls):
                    jobs=args.jobs)]
         else:
             cmd = argv
-        vm.boot(args.image + ",snapshot=on")
+        img = args.image
+        if args.snapshot:
+            img += ",snapshot=on"
+        vm.boot(img)
         vm.wait_ssh()
     except Exception as e:
         if isinstance(e, SystemExit) and e.code == 0: