object/tag: Clone

1 files changed, 29 insertions, 0 deletions

diff --git a/object/tag/clone.go b/object/tag/clone.go
new file mode 100644
index 00000000..0f792bc1
--- /dev/null
+++ b/object/tag/clone.go
@@ -0,0 +1,29 @@
+package tag
+
+import "bytes"
+
+// Clone returns a deep copy of the tag
+// whose byte fields are independent of any memory the original may alias.
+//
+// Labels: Life-Independent.
+func (tag *Tag) Clone() *Tag {
+	clone := &Tag{
+		TargetID:   tag.TargetID,
+		TargetType: tag.TargetType,
+		Name:       bytes.Clone(tag.Name),
+		Tagger:     tag.Tagger.Clone(),
+		Message:    bytes.Clone(tag.Message),
+	}
+
+	if tag.ExtraHeaders != nil {
+		clone.ExtraHeaders = make([]ExtraHeader, len(tag.ExtraHeaders))
+		for i, h := range tag.ExtraHeaders {
+			clone.ExtraHeaders[i] = ExtraHeader{
+				Key:   bytes.Clone(h.Key),
+				Value: bytes.Clone(h.Value),
+			}
+		}
+	}
+
+	return clone
+}