1 files changed, 20 insertions, 0 deletions
diff --git a/format/commitgraph/read/close.go b/format/commitgraph/read/close.go
new file mode 100644
index 00000000..f8b6141a
--- /dev/null
+++ b/format/commitgraph/read/close.go
@@ -0,0 +1,20 @@
+package read
+
+// Close releases all mapped commit-graph files.
+//
+// Repeated calls to Close are undefined behavior.
+func (reader *Reader) Close() error {
+	var closeErr error
+
+	for i := len(reader.layers) - 1; i >= 0; i-- {
+		err := reader.layers[i].close()
+		if err != nil && closeErr == nil {
+			closeErr = err
+		}
+	}
+
+	reader.layers = nil
+	reader.total = 0
+
+	return closeErr
+}