[PULL v3 5/6] tests/9pfs: add virtio_9p_test_path()

[Christian Schoenebeck <qemu_oss@crudebyte.com>]

This new public function virtio_9p_test_path() allows 9pfs
'local' tests to translate a path from guest scope to host
scope. For instance by passing an empty string it would
return the root path on host of the exported 9pfs tree.

Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Message-Id: <b563d3c73c6391ec927a2622c9f65c09ca56bd83.1602182956.git.qemu_oss@crudebyte.com>
Signed-off-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
---
 tests/qtest/libqos/virtio-9p.c | 6 ++++++
 tests/qtest/libqos/virtio-9p.h | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/tests/qtest/libqos/virtio-9p.c b/tests/qtest/libqos/virtio-9p.c
index 8ee2a134bc..d43647b3b7 100644
--- a/tests/qtest/libqos/virtio-9p.c
+++ b/tests/qtest/libqos/virtio-9p.c
@@ -65,6 +65,12 @@ static void remove_local_test_dir(void)
     g_free(cmd);
 }
 
+char *virtio_9p_test_path(const char *path)
+{
+    g_assert(local_test_path);
+    return concat_path(local_test_path, path);
+}
+
 static void virtio_9p_cleanup(QVirtio9P *interface)
 {
     qvirtqueue_cleanup(interface->vdev->bus, interface->vq, alloc);
diff --git a/tests/qtest/libqos/virtio-9p.h b/tests/qtest/libqos/virtio-9p.h
index 326a603f72..19a4d97454 100644
--- a/tests/qtest/libqos/virtio-9p.h
+++ b/tests/qtest/libqos/virtio-9p.h
@@ -49,4 +49,9 @@ struct QVirtio9PDevice {
  */
 void virtio_9p_assign_local_driver(GString *cmd_line, const char *args);
 
+/**
+ * Returns path on host to the passed guest path. Result must be freed.
+ */
+char *virtio_9p_test_path(const char *path);
+
 #endif
-- 
2.20.1