Use Gitaly for Environment#first_deployment_for

app/models/repository.rb

@@ -6,6 +6,8 @@ class Repository
 
   attr_accessor :path_with_namespace, :project
 
+  delegate :ref_name_for_sha, to: :raw_repository
+
   CommitError = Class.new(StandardError)
   CreateTreeError = Class.new(StandardError)
 
@@ -700,14 +702,6 @@ class Repository
     end
   end
 
-  def ref_name_for_sha(ref_path, sha)
-    args = %W(#{Gitlab.config.git.bin_path} for-each-ref --count=1 #{ref_path} --contains #{sha})
-
-    # Not found -> ["", 0]
-    # Found -> ["b8d95eb4969eefacb0a58f6a28f6803f8070e7b9 commit\trefs/environments/production/77\n", 0]
-    Gitlab::Popen.popen(args, path_to_repo).first.split.last
-  end
-
   def refs_contains_sha(ref_type, sha)
     args = %W(#{Gitlab.config.git.bin_path} #{ref_type} --contains #{sha})
     names = Gitlab::Popen.popen(args, path_to_repo).first

lib/gitlab/git/repository.rb

@@ -452,6 +452,21 @@ module Gitlab
         Gitlab::Git::DiffCollection.new(diff_patches(from, to, options, *paths), options)
       end
 
+      # Returns a RefName for a given SHA
+      def ref_name_for_sha(ref_path, sha)
+        Gitlab::GitalyClient.migrate(:find_ref_name) do |is_enabled|
+          if is_enabled
+            Gitlab::GitalyClient::Ref.find_ref_name(self, sha, ref_path)
+          else
+            args = %W(#{Gitlab.config.git.bin_path} for-each-ref --count=1 #{ref_path} --contains #{sha})
+
+            # Not found -> ["", 0]
+            # Found -> ["b8d95eb4969eefacb0a58f6a28f6803f8070e7b9 commit\trefs/environments/production/77\n", 0]
+            Gitlab::Popen.popen(args, @path).first.split.last
+          end
+        end
+      end
+
       # Returns commits collection
       #
       # Ex.

lib/gitlab/gitaly_client/ref.rb

@@ -23,6 +23,16 @@ module Gitlab
         consume_refs_response(stub.find_all_tag_names(request), prefix: 'refs/tags/')
       end
 
+      def find_ref_name(commit_id, ref_prefix)
+        request   = Gitaly::FindRefNameRequest.new(
+          repository: @repository,
+          commit_id: commit_id,
+          prefix: ref_prefix
+        )
+
+        stub.find_ref_name(request).name
+      end
+
       private
 
       def consume_refs_response(response, prefix:)

spec/models/environment_spec.rb

@@ -100,12 +100,27 @@ describe Environment, models: true do
     let(:head_commit)   { project.commit }
     let(:commit)        { project.commit.parent }
 
-    it 'returns deployment id for the environment' do
-      expect(environment.first_deployment_for(commit)).to eq deployment1
+    context 'Gitaly find_ref_name feature disables' do
+      it 'returns deployment id for the environment' do
+        expect(environment.first_deployment_for(commit)).to eq deployment1
+      end
+
+      it 'return nil when no deployment is found' do
+        expect(environment.first_deployment_for(head_commit)).to eq nil
+      end
     end
 
-    it 'return nil when no deployment is found' do
-      expect(environment.first_deployment_for(head_commit)).to eq nil
+    context 'Gitaly find_ref_name feature enabled' do
+      before do
+        allow(Gitlab::GitalyClient).to receive(:feature_enabled?).with(:find_ref_name).and_return(true)
+      end
+
+      it 'checks that GitalyClient is called' do
+        expect(Gitlab::GitalyClient::Ref).to receive(:find_ref_name).with(project.repository.raw_repository, commit.id, environment.ref_path)
+
+        environment.first_deployment_for(commit)
+      end
+
     end
   end