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-rwxr-xr-xtests/docker/docker.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/docker/docker.py b/tests/docker/docker.py
index 8747f6a440..6ddc6e4c2a 100755
--- a/tests/docker/docker.py
+++ b/tests/docker/docker.py
@@ -52,7 +52,7 @@ def _guess_docker_command():
raise Exception("Cannot find working docker command. Tried:\n%s" % \
commands_txt)
-def _copy_with_mkdir(src, root_dir, sub_path):
+def _copy_with_mkdir(src, root_dir, sub_path='.'):
"""Copy src into root_dir, creating sub_path as needed."""
dest_dir = os.path.normpath("%s/%s" % (root_dir, sub_path))
try: