Raw changes calculation is Gitaly only now

Closes https://gitlab.com/gitlab-org/gitaly/issues/1138

lib/gitlab/git/repository.rb

@@ -529,32 +529,17 @@ module Gitlab
       def raw_changes_between(old_rev, new_rev)
         @raw_changes_between ||= {}
 
-        @raw_changes_between[[old_rev, new_rev]] ||= begin
-          return [] if new_rev.blank? || new_rev == Gitlab::Git::BLANK_SHA
+        @raw_changes_between[[old_rev, new_rev]] ||=
+          begin
+            return [] if new_rev.blank? || new_rev == Gitlab::Git::BLANK_SHA
 
-          gitaly_migrate(:raw_changes_between) do |is_enabled|
-            if is_enabled
+            wrapped_gitaly_errors do
               gitaly_repository_client.raw_changes_between(old_rev, new_rev)
                 .each_with_object([]) do |msg, arr|
                 msg.raw_changes.each { |change| arr << ::Gitlab::Git::RawDiffChange.new(change) }
               end
-            else
-              result = []
-
-              circuit_breaker.perform do
-                Open3.pipeline_r(git_diff_cmd(old_rev, new_rev), format_git_cat_file_script, git_cat_file_cmd) do |last_stdout, wait_threads|
-                  last_stdout.each_line { |line| result << ::Gitlab::Git::RawDiffChange.new(line.chomp!) }
-
-                  if wait_threads.any? { |waiter| !waiter.value&.success? }
-                    raise ::Gitlab::Git::Repository::GitError, "Unabled to obtain changes between #{old_rev} and #{new_rev}"
-                  end
-                end
-              end
-
-              result
             end
           end
-        end
       rescue ArgumentError => e
         raise Gitlab::Git::Repository::GitError.new(e)
       end

spec/lib/gitlab/git/repository_spec.rb

@@ -1043,50 +1043,40 @@ describe Gitlab::Git::Repository, seed_helper: true do
   end
 
   describe '#raw_changes_between' do
-    shared_examples 'raw changes' do
-      let(:old_rev) { }
-      let(:new_rev) { }
-      let(:changes) { repository.raw_changes_between(old_rev, new_rev) }
+    let(:old_rev) { }
+    let(:new_rev) { }
+    let(:changes) { repository.raw_changes_between(old_rev, new_rev) }
 
-      context 'initial commit' do
-        let(:old_rev) { Gitlab::Git::BLANK_SHA }
-        let(:new_rev) { '1a0b36b3cdad1d2ee32457c102a8c0b7056fa863' }
+    context 'initial commit' do
+      let(:old_rev) { Gitlab::Git::BLANK_SHA }
+      let(:new_rev) { '1a0b36b3cdad1d2ee32457c102a8c0b7056fa863' }
 
-        it 'returns the changes' do
-          expect(changes).to be_present
-          expect(changes.size).to eq(3)
-        end
+      it 'returns the changes' do
+        expect(changes).to be_present
+        expect(changes.size).to eq(3)
       end
+    end
 
-      context 'with an invalid rev' do
-        let(:old_rev) { 'foo' }
-        let(:new_rev) { 'bar' }
+    context 'with an invalid rev' do
+      let(:old_rev) { 'foo' }
+      let(:new_rev) { 'bar' }
 
-        it 'returns an error' do
-          expect { changes }.to raise_error(Gitlab::Git::Repository::GitError)
-        end
-      end
-
-      context 'with valid revs' do
-        let(:old_rev) { 'fa1b1e6c004a68b7d8763b86455da9e6b23e36d6' }
-        let(:new_rev) { '4b4918a572fa86f9771e5ba40fbd48e1eb03e2c6' }
-
-        it 'returns the changes' do
-          expect(changes.size).to eq(9)
-          expect(changes.first.operation).to eq(:modified)
-          expect(changes.first.new_path).to eq('.gitmodules')
-          expect(changes.last.operation).to eq(:added)
-          expect(changes.last.new_path).to eq('files/lfs/picture-invalid.png')
-        end
+      it 'returns an error' do
+        expect { changes }.to raise_error(Gitlab::Git::Repository::GitError)
       end
     end
 
-    context 'when gitaly is enabled' do
-      it_behaves_like 'raw changes'
-    end
+    context 'with valid revs' do
+      let(:old_rev) { 'fa1b1e6c004a68b7d8763b86455da9e6b23e36d6' }
+      let(:new_rev) { '4b4918a572fa86f9771e5ba40fbd48e1eb03e2c6' }
 
-    context 'when gitaly is disabled', :disable_gitaly do
-      it_behaves_like 'raw changes'
+      it 'returns the changes' do
+        expect(changes.size).to eq(9)
+        expect(changes.first.operation).to eq(:modified)
+        expect(changes.first.new_path).to eq('.gitmodules')
+        expect(changes.last.operation).to eq(:added)
+        expect(changes.last.new_path).to eq('files/lfs/picture-invalid.png')
+      end
     end
   end