tests/drive_del-test: Fix harmless JSON interpolation bug

test_after_failed_device_add() does this:

    response = qmp("{'execute': 'device_add',"
                   " 'arguments': {"
                   "   'driver': 'virtio-blk-%s',"
                   "   'drive': 'drive0'"
                   "}}", qvirtio_get_dev_type());

Wrong.  An interpolation specification must be a JSON token, it
doesn't work within JSON string tokens.  The code above doesn't use
the value of qvirtio_get_dev_type(), and sends arguments

    {"driver": "virtio-blk-%s", "drive": "drive0"}}

The command fails because there is no driver named "virtio-blk-%".
Harmless, since the test wants the command to fail.  Screwed up in
commit 2f84a92ec63.

Fix the obvious way.  The command now fails because the drive is
empty, like it did before commit 2f84a92ec63.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180823164025.12553-55-armbru@redhat.com>

diff --git a/tests/drive_del-test.c b/tests/drive_del-test.c
index 2d0b176b361cd7e9b49b40d01095f1663c8f1b9d..673c10140f7f12bd35ddf0a2cff36351168cbeaa 100644 (file)
--- a/tests/drive_del-test.c
+++ b/tests/drive_del-test.c
@@ -65,9 +65,13 @@ static void test_drive_without_dev(void)
 
 static void test_after_failed_device_add(void)
 {
+    char driver[32];
     QDict *response;
     QDict *error;
 
+    snprintf(driver, sizeof(driver), "virtio-blk-%s",
+             qvirtio_get_dev_type());
+
     qtest_start("-drive if=none,id=drive0");
 
     /* Make device_add fail. If this leaks the virtio-blk device then a
@@ -75,9 +79,9 @@ static void test_after_failed_device_add(void)
      */
     response = qmp("{'execute': 'device_add',"
                    " 'arguments': {"
-                   "   'driver': 'virtio-blk-%s',"
+                   "   'driver': %s,"
                    "   'drive': 'drive0'"
-                   "}}", qvirtio_get_dev_type());
+                   "}}", driver);
     g_assert(response);
     error = qdict_get_qdict(response, "error");
     g_assert_cmpstr(qdict_get_try_str(error, "class"), ==, "GenericError");