1 files changed, 19 insertions, 83 deletions

diff --git a/lib/gitlab/conflict/file_collection.rb b/lib/gitlab/conflict/file_collection.rb
index 4fedfe8691a..573a953b2aa 100644
--- a/lib/gitlab/conflict/file_collection.rb
+++ b/lib/gitlab/conflict/file_collection.rb
@@ -1,68 +1,29 @@
 module Gitlab
   module Conflict
     class FileCollection
-      ConflictSideMissing = Class.new(StandardError)
-      MissingFiles = Class.new(ResolutionError)
-
-      attr_reader :merge_request, :our_commit, :their_commit, :project, :read_only
-
-      delegate :repository, to: :project
-
-      class << self
-        # We can only write when getting the merge index from the source
-        # project, because we will write to that project. We don't use this all
-        # the time because this fetches a ref into the source project, which
-        # isn't needed for reading.
-        def for_resolution(merge_request)
-          new(merge_request, merge_request.source_project, false)
-        end
-
-        # We don't need to do `with_repo_branch_commit` here, because the target
-        # project always fetches source refs when creating merge request diffs.
-        def read_only(merge_request)
-          new(merge_request, merge_request.target_project, true)
-        end
+      attr_reader :merge_request, :merge
+
+      def initialize(merge_request)
+        source_repo = merge_request.source_project.repository.raw
+        our_commit = merge_request.source_branch_head.raw
+        their_commit = merge_request.target_branch_head.raw
+        target_repo = merge_request.target_project.repository.raw
+        @merge = Gitlab::Git::Merge.new(source_repo, our_commit, target_repo, their_commit)
+        @merge_request = merge_request
       end
 
       def resolve(user, commit_message, files)
-        raise "can't resolve a read-only Conflict File Collection" if read_only
-
-        repository.with_repo_branch_commit(merge_request.target_project.repository.raw, merge_request.target_branch) do
-          rugged = repository.rugged
-
-          files.each do |file_params|
-            conflict_file = file_for_path(file_params[:old_path], file_params[:new_path])
-
-            write_resolved_file_to_index(merge_index, rugged, conflict_file, file_params)
-          end
-
-          unless merge_index.conflicts.empty?
-            missing_files = merge_index.conflicts.map { |file| file[:ours][:path] }
-
-            raise MissingFiles, "Missing resolutions for the following files: #{missing_files.join(', ')}"
-          end
-
-          commit_params = {
-            message: commit_message || default_commit_message,
-            parents: [our_commit, their_commit].map(&:oid),
-            tree: merge_index.write_tree(rugged)
-          }
-
-          repository.resolve_conflicts(user, merge_request.source_branch, commit_params)
-        end
-      end
-
-      def merge_index
-        @merge_index ||= repository.rugged.merge_commits(our_commit, their_commit)
+        args = {
+          source_branch: merge_request.source_branch,
+          target_branch: merge_request.target_branch,
+          commit_message: commit_message || default_commit_message
+        }
+        merge.resolve_conflicts(user, files, args)
       end
 
       def files
-        @files ||= merge_index.conflicts.map do |conflict|
-          raise ConflictSideMissing unless conflict[:theirs] && conflict[:ours]
-
-          Gitlab::Conflict::File.new(merge_index.merge_file(conflict[:ours][:path]),
-                                     conflict,
-                                     merge_request: merge_request)
+        @files ||= merge.conflicts.map do |conflict_file|
+          Gitlab::Conflict::File.new(conflict_file, merge_request: merge_request)
         end
       end
 
@@ -81,8 +42,8 @@ module Gitlab
       end
 
       def default_commit_message
-        conflict_filenames = merge_index.conflicts.map do |conflict|
-          "#   #{conflict[:ours][:path]}"
+        conflict_filenames = files.map do |conflict|
+          "#   #{conflict.our_path}"
         end
 
         <<EOM.chomp
@@ -92,31 +53,6 @@ Merge branch '#{merge_request.target_branch}' into '#{merge_request.source_branc
 #{conflict_filenames.join("\n")}
 EOM
       end
-
-      private
-
-      def write_resolved_file_to_index(merge_index, rugged, file, params)
-        if params[:sections]
-          new_file = file.resolve_lines(params[:sections]).map(&:text).join("\n")
-
-          new_file << "\n" if file.our_blob.data.ends_with?("\n")
-        elsif params[:content]
-          new_file = file.resolve_content(params[:content])
-        end
-
-        our_path = file.our_path
-
-        merge_index.add(path: our_path, oid: rugged.write(new_file, :blob), mode: file.our_mode)
-        merge_index.conflict_remove(our_path)
-      end
-
-      def initialize(merge_request, project, read_only)
-        @merge_request = merge_request
-        @our_commit = merge_request.source_branch_head.raw.rugged_commit
-        @their_commit = merge_request.target_branch_head.raw.rugged_commit
-        @project = project
-        @read_only = read_only
-      end
     end
   end
 end