Trying to incorporate suggestions from comments on Merge Request 1661

app/models/repository.rb

@@ -87,10 +87,11 @@ class Repository
     commits
   end
 
-  def commits_with_log_matching(query)
-    list = Gitlab::Git::Commit.where(repo: raw_repository, limit: 1000)
-    list = Commit.decorate(list, @project) if list.present?
-    list.select! { |c| c.message.match /#{query}/i }
+  def find_commits_with_matching_log(query)
+    # Limited to 1000 commits for now, could be parameterized?
+    args = %W(git log --pretty=%H --max-count 1000 --grep=#{query})
+
+    Gitlab::Popen.popen(args, path_to_repo)
   end
 
   def find_branch(name)

lib/gitlab/project_search_results.rb

@@ -77,7 +77,7 @@ module Gitlab
     end
 
     def commits
-      project.repository.commits_with_log_matching(query)
+      project.repository.find_commits_with_matching_log(query)
     end
 
     def limit_project_ids

spec/models/repository_spec.rb

@@ -26,8 +26,8 @@ describe Repository do
     it { is_expected.to eq('c1acaa58bbcbc3eafe538cb8274ba387047b69f8') }
   end
 
-  describe :commits_with_log_matching do
-    subject { repository.commits_with_log_matching('submodule').map{|k| k.id} }
+  describe :find_commits_with_matching_log do
+    subject { repository.find_commits_with_matching_log('submodule').map{|k| k.id} }
 
     it { is_expected.to include('5937ac0a7beb003549fc5fd26fc247adbce4a52e') }
     it { is_expected.to include('6f6d7e7ed97bb5f0054f2b1df789b39ca89b6ff9') }