1 files changed, 30 insertions, 0 deletions
diff --git a/lib/gitlab/git/diff_tree.rb b/lib/gitlab/git/diff_tree.rb
new file mode 100644
index 00000000000..df48baeb1c3
--- /dev/null
+++ b/lib/gitlab/git/diff_tree.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Git
+    # Represents a tree-ish object for git diff-tree command
+    # See: https://git-scm.com/docs/git-diff-tree
+    class DiffTree
+      attr_reader :left_tree_id, :right_tree_id
+
+      def initialize(left_tree_id, right_tree_id)
+        @left_tree_id = left_tree_id
+        @right_tree_id = right_tree_id
+      end
+
+      def self.from_commit(commit)
+        return unless commit.tree_id
+
+        parent_tree_id =
+          if commit.parent_ids.blank?
+            Gitlab::Git::EMPTY_TREE_ID
+          else
+            parent_id = commit.parent_ids.first
+            commit.repository.commit(parent_id).tree_id
+          end
+
+        new(parent_tree_id, commit.tree_id)
+      end
+    end
+  end
+end