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-rw-r--r--buildstream/utils.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/buildstream/utils.py b/buildstream/utils.py
index 209e9d094..40705346b 100644
--- a/buildstream/utils.py
+++ b/buildstream/utils.py
@@ -532,6 +532,11 @@ def save_file_atomic(filename, mode='w', *, buffering=-1, encoding=None,
raise
+# A sentinel to be used as a default argument for functions that need
+# to distinguish between a kwarg set to None and an unset kwarg.
+_sentinel = object()
+
+
# Recursively remove directories, ignoring file permissions as much as
# possible.
def _force_rmtree(rootpath, **kwargs):