merge_request: Drop checks whether a squash is in progress

Originally, Gitaly has implemented squashes via a separate worktree of
the repository. This has changed though in v14.1, where Gitaly now uses
an in-memory implementation of squashes. The result of this is that it
is both faster (~4x) and less error-prone.

One side effect though is that it's not possible to tell anymore whether
a squash is in progress or not: there is no on-disk state anymore which
Gitaly could check. Because of this, Gitaly has deprecated the RPC and
will eventually remove it.

Remove this check on GitLab's side to adapt to this change: it doesn't
work anymore anyway. If it needs to resurface, the check would instead
need to be implemented in GitLab itself, where any ongoing squashes
would need to be recorded as part of the database.

Changelog: removed

app/models/merge_request.rb

@@ -1835,13 +1835,6 @@ def can_allow_collaboration?(user)
       Ability.allowed?(user, :push_code, source_project)
   end
-  def squash_in_progress?
-    # The source project can be deleted
-    return false unless source_project
-
-    source_project.repository.squash_in_progress?(id)
-  end
-
   def find_actual_head_pipeline
     all_pipelines.for_sha_or_source_sha(diff_head_sha).first
   end

app/services/merge_requests/squash_service.rb

@@ -2,8 +2,6 @@
 module MergeRequests
   class SquashService < MergeRequests::BaseService
-    SquashInProgressError = Class.new(RuntimeError)
-
     def execute
       # If performing a squash would result in no change, then
       # immediately return a success message without performing a squash
@@ -13,14 +11,7 @@ def execute
       return error(s_('MergeRequests|This project does not allow squashing commits when merge requests are accepted.')) if squash_forbidden?
-      if squash_in_progress?
-        return error(s_('MergeRequests|Squash task canceled: another squash is already in progress.'))
-      end
-
       squash! || error(s_('MergeRequests|Failed to squash. Should be done manually.'))
-
-    rescue SquashInProgressError
-      error(s_('MergeRequests|An error occurred while checking whether another squash is in progress.'))
     end
     private
@@ -35,14 +26,6 @@ def squash!
       false
     end
-    def squash_in_progress?
-      merge_request.squash_in_progress?
-    rescue StandardError => e
-      log_error(exception: e, message: 'Failed to check squash in progress')
-
-      raise SquashInProgressError, e.message
-    end
-
     def squash_forbidden?
       target_project.squash_never?
     end

lib/gitlab/git/repository.rb

@@ -869,12 +869,6 @@ def squash(user, squash_id, start_sha:, end_sha:, author:, message:)
         end
       end
-      def squash_in_progress?(squash_id)
-        wrapped_gitaly_errors do
-          gitaly_repository_client.squash_in_progress?(squash_id)
-        end
-      end
-
       def bundle_to_disk(save_path)
         wrapped_gitaly_errors do
           gitaly_repository_client.create_bundle(save_path)

lib/gitlab/gitaly_client/repository_service.rb

@@ -155,23 +155,6 @@ def import_repository(source)
         )
       end
-      def squash_in_progress?(squash_id)
-        request = Gitaly::IsSquashInProgressRequest.new(
-          repository: @gitaly_repo,
-          squash_id: squash_id.to_s
-        )
-
-        response = GitalyClient.call(
-          @storage,
-          :repository_service,
-          :is_squash_in_progress,
-          request,
-          timeout: GitalyClient.fast_timeout
-        )
-
-        response.in_progress
-      end
-
       def fetch_source_branch(source_repository, source_branch, local_ref)
         request = Gitaly::FetchSourceBranchRequest.new(
           repository: @gitaly_repo,

locale/gitlab.pot

@@ -21063,9 +21063,6 @@ msgstr ""
 msgid "MergeRequestDiffs|Select comment starting line"
 msgstr ""
-msgid "MergeRequests|An error occurred while checking whether another squash is in progress."
-msgstr ""
-
 msgid "MergeRequests|An error occurred while saving the draft comment."
 msgstr ""
@@ -21078,9 +21075,6 @@ msgstr ""
 msgid "MergeRequests|Saving the comment failed"
 msgstr ""
-msgid "MergeRequests|Squash task canceled: another squash is already in progress."
-msgstr ""
-
 msgid "MergeRequests|This project does not allow squashing commits when merge requests are accepted."
 msgstr ""

spec/lib/gitlab/gitaly_client/repository_service_spec.rb

@@ -195,19 +195,6 @@
     end
   end
-  describe '#squash_in_progress?' do
-    let(:squash_id) { 1 }
-
-    it 'sends a repository_squash_in_progress message' do
-      expect_any_instance_of(Gitaly::RepositoryService::Stub)
-        .to receive(:is_squash_in_progress)
-        .with(gitaly_request_with_path(storage_name, relative_path), kind_of(Hash))
-        .and_return(double(in_progress: true))
-
-      client.squash_in_progress?(squash_id)
-    end
-  end
-
   describe '#calculate_checksum' do
     it 'sends a calculate_checksum message' do
       expect_any_instance_of(Gitaly::RepositoryService::Stub)

spec/models/merge_request_spec.rb

@@ -151,43 +151,6 @@
     end
   end
-  describe '#squash_in_progress?' do
-    let(:repo_path) do
-      Gitlab::GitalyClient::StorageSettings.allow_disk_access do
-        subject.source_project.repository.path
-      end
-    end
-
-    let(:squash_path) { File.join(repo_path, "gitlab-worktree", "squash-#{subject.id}") }
-
-    before do
-      system(*%W(#{Gitlab.config.git.bin_path} -C #{repo_path} worktree add --detach #{squash_path} master))
-    end
-
-    it 'returns true when there is a current squash directory' do
-      expect(subject.squash_in_progress?).to be_truthy
-    end
-
-    it 'returns false when there is no squash directory' do
-      FileUtils.rm_rf(squash_path)
-
-      expect(subject.squash_in_progress?).to be_falsey
-    end
-
-    it 'returns false when the squash directory has expired' do
-      time = 20.minutes.ago.to_time
-      File.utime(time, time, squash_path)
-
-      expect(subject.squash_in_progress?).to be_falsey
-    end
-
-    it 'returns false when the source project has been removed' do
-      allow(subject).to receive(:source_project).and_return(nil)
-
-      expect(subject.squash_in_progress?).to be_falsey
-    end
-  end
-
   describe '#squash?' do
     let(:merge_request) { build(:merge_request, squash: squash) }

spec/services/merge_requests/merge_service_spec.rb

@@ -402,21 +402,6 @@
           expect(Gitlab::AppLogger).to have_received(:error).with(a_string_matching(error_message))
         end
-        it 'logs and saves error if there is a squash in progress' do
-          error_message = 'another squash is already in progress'
-
-          allow_any_instance_of(MergeRequest).to receive(:squash_in_progress?).and_return(true)
-          merge_request.update!(squash: true)
-
-          service.execute(merge_request)
-
-          expect(merge_request).to be_open
-          expect(merge_request.merge_commit_sha).to be_nil
-          expect(merge_request.squash_commit_sha).to be_nil
-          expect(merge_request.merge_error).to include(error_message)
-          expect(Gitlab::AppLogger).to have_received(:error).with(a_string_matching(error_message))
-        end
-
         it 'logs and saves error if there is an PreReceiveError exception' do
           error_message = 'error message'

spec/services/merge_requests/squash_service_spec.rb

@@ -194,23 +194,6 @@
           expect(service.execute).to match(status: :error, message: a_string_including('squash'))
         end
       end
-
-      context 'with an error in squash in progress check' do
-        before do
-          allow(repository).to receive(:squash_in_progress?)
-            .and_raise(Gitlab::Git::Repository::GitError, error)
-        end
-
-        it 'logs the stage and output' do
-          expect(service).to receive(:log_error).with(exception: an_instance_of(Gitlab::Git::Repository::GitError), message: 'Failed to check squash in progress')
-
-          service.execute
-        end
-
-        it 'returns an error' do
-          expect(service.execute).to match(status: :error, message: 'An error occurred while checking whether another squash is in progress.')
-        end
-      end
     end
     context 'when any other exception is thrown' do