Merge branch '36571-ignore-root-in-repo' into 'master'

Resolve "Error while searching for text starting with slash "/""

Closes #36571

See merge request gitlab-org/gitlab-ce!16455

app/models/repository.rb

@@ -938,9 +938,11 @@ class Repository
   end
 
   def search_files_by_name(query, ref)
-    return [] if empty? || query.blank?
+    safe_query = Regexp.escape(query.sub(/^\/*/, ""))
 
-    args = %W(ls-tree --full-tree -r #{ref || root_ref} --name-status | #{Regexp.escape(query)})
+    return [] if empty? || safe_query.blank?
+
+    args = %W(ls-tree --full-tree -r #{ref || root_ref} --name-status | #{safe_query})
 
     run_git(args).first.lines.map(&:strip)
   end

changelogs/unreleased/36571-ignore-root-in-repo.yml

@@ -0,0 +1,5 @@
+---
+title: Ignore leading slashes when searching for files within context of repository.
+merge_request:
+author: Andrew McCallum
+type: fixed

spec/models/repository_spec.rb

@@ -668,6 +668,18 @@ describe Repository do
       expect(results.first).to eq('files/html/500.html')
     end
 
+    it 'ignores leading slashes' do
+      results = repository.search_files_by_name('/files', 'master')
+
+      expect(results.first).to eq('files/html/500.html')
+    end
+
+    it 'properly handles when query is only slashes' do
+      results = repository.search_files_by_name('//', 'master')
+
+      expect(results).to match_array([])
+    end
+
     it 'properly handles when query is not present' do
       results = repository.search_files_by_name('', 'master')