[PATCH 10/12] tests/9pfs: wipe local 9pfs test directory

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

Before running the first 9pfs test case, make sure the test directory
for running the 9pfs 'local' tests on is entirely empty. For that
reason simply delete the test directory (if any) before (re)creating
it on test suite startup.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
---
 tests/qtest/libqos/virtio-9p.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tests/qtest/libqos/virtio-9p.c b/tests/qtest/libqos/virtio-9p.c
index 400f4b0113..b44fc4ad63 100644
--- a/tests/qtest/libqos/virtio-9p.c
+++ b/tests/qtest/libqos/virtio-9p.c
@@ -80,6 +80,18 @@ static void create_local_test_dir(void)
     g_assert((st.st_mode & S_IFMT) == S_IFDIR);
 }
 
+/* Deletes directory previously created by create_local_test_dir(). */
+static void remove_local_test_dir(void)
+{
+    g_assert(local_test_path != NULL);
+    char *cmd = strpr("rm -r '%s'\n", local_test_path);
+    int res = system(cmd);
+    if (res < 0) {
+        /* ignore error, dummy check to prevent compiler error */
+    }
+    g_free(cmd);
+}
+
 static void virtio_9p_cleanup(QVirtio9P *interface)
 {
     qvirtqueue_cleanup(interface->vdev->bus, interface->vq, alloc);
@@ -209,6 +221,7 @@ static void virtio_9p_register_nodes(void)
 {
     /* make sure test dir for the 'local' tests exists and is clean */
     init_local_test_path();
+    remove_local_test_dir();
     create_local_test_dir();
 
     /* 9pfs device using the 'synth' fs driver */
-- 
2.20.1