Calculate modified paths of a git push operation

2 files changed, 18 insertions, 0 deletions

diff --git a/lib/gitlab/git/diff_stats_collection.rb b/lib/gitlab/git/diff_stats_collection.rb
index d4033f56387..998c41497a2 100644
--- a/lib/gitlab/git/diff_stats_collection.rb
+++ b/lib/gitlab/git/diff_stats_collection.rb
@@ -18,6 +18,10 @@ module Gitlab
         indexed_by_path[path]
       end
 
+      def paths
+        @collection.map(&:path)
+      end
+
       private
 
       def indexed_by_path
diff --git a/lib/gitlab/git/push.rb b/lib/gitlab/git/push.rb
index b6e414927ea..603f860e4f8 100644
--- a/lib/gitlab/git/push.rb
+++ b/lib/gitlab/git/push.rb
@@ -28,6 +28,10 @@ module Gitlab
         Gitlab::Git.blank_ref?(@newrev)
       end
 
+      def branch_updated?
+        branch_push? && !branch_added? && !branch_removed?
+      end
+
       def force_push?
         Gitlab::Checks::ForcePush.force_push?(@project, @oldrev, @newrev)
       end
@@ -37,6 +41,16 @@ module Gitlab
           Gitlab::Git.branch_ref?(@ref)
         end
       end
+
+      def modified_paths
+        unless branch_updated?
+          raise ArgumentError, 'Unable to calculate modified paths!'
+        end
+
+        strong_memoize(:modified_paths) do
+          @project.repository.diff_stats(@oldrev, @newrev).paths
+        end
+      end
     end
   end
 end