Revert a default GIT_DEPTH for MR pipeline

app/presenters/ci/build_runner_presenter.rb

@@ -4,7 +4,6 @@ module Ci
   class BuildRunnerPresenter < SimpleDelegator
     include Gitlab::Utils::StrongMemoize
-    DEFAULT_GIT_DEPTH_MERGE_REQUEST = 10
     RUNNER_REMOTE_TAG_PREFIX = 'refs/tags/'.freeze
     RUNNER_REMOTE_BRANCH_PREFIX = 'refs/remotes/origin/'.freeze
@@ -28,7 +27,6 @@ module Ci
     def git_depth
       strong_memoize(:git_depth) do
         git_depth = variables&.find { |variable| variable[:key] == 'GIT_DEPTH' }&.dig(:value)
-        git_depth ||= DEFAULT_GIT_DEPTH_MERGE_REQUEST if merge_request_ref?
         git_depth.to_i
       end
     end
@@ -39,12 +37,13 @@ module Ci
       if git_depth > 0
         specs << refspec_for_branch(ref) if branch? || legacy_detached_merge_request_pipeline?
         specs << refspec_for_tag(ref) if tag?
-        specs << refspec_for_merge_request_ref if merge_request_ref?
       else
         specs << refspec_for_branch
         specs << refspec_for_tag
       end
+      specs << refspec_for_merge_request_ref if merge_request_ref?
+
       specs
     end

changelogs/unreleased/revert-git-depth-for-merge-request.yml

+---
+title: Remove a default git depth in Pipelines for merge requests
+merge_request: 28926
+author:
+type: fixed

spec/presenters/ci/build_runner_presenter_spec.rb

@@ -136,24 +136,6 @@ describe Ci::BuildRunnerPresenter do
         is_expected.to eq(1)
       end
     end
-
-    context 'when pipeline is detached merge request pipeline' do
-      let(:merge_request) { create(:merge_request, :with_detached_merge_request_pipeline) }
-      let(:pipeline) { merge_request.all_pipelines.first }
-      let(:build) { create(:ci_build, ref: pipeline.ref, pipeline: pipeline) }
-
-      it 'returns the default git depth for pipelines for merge requests' do
-        is_expected.to eq(described_class::DEFAULT_GIT_DEPTH_MERGE_REQUEST)
-      end
-
-      context 'when pipeline is legacy detached merge request pipeline' do
-        let(:merge_request) { create(:merge_request, :with_legacy_detached_merge_request_pipeline) }
-
-        it 'behaves as branch pipeline' do
-          is_expected.to eq(0)
-        end
-      end
-    end
   end
   describe '#refspecs' do
@@ -191,7 +173,9 @@ describe Ci::BuildRunnerPresenter do
       it 'returns the correct refspecs' do
         is_expected
-          .to contain_exactly('+refs/merge-requests/1/head:refs/merge-requests/1/head')
+          .to contain_exactly('+refs/heads/*:refs/remotes/origin/*',
+                              '+refs/tags/*:refs/tags/*',
+                              '+refs/merge-requests/1/head:refs/merge-requests/1/head')
       end
       context 'when pipeline is legacy detached merge request pipeline' do