Fix Error 500 when repository has no avatarsh-fix-error-500-no-avatars

Closes #42249

3 files changed, 23 insertions, 1 deletions

diff --git a/lib/gitlab/git/blob.rb b/lib/gitlab/git/blob.rb
index 031fccba92b..f421bf69e8f 100644
--- a/lib/gitlab/git/blob.rb
+++ b/lib/gitlab/git/blob.rb
@@ -132,6 +132,8 @@ module Gitlab
         end
 
         def find_by_gitaly(repository, sha, path, limit: MAX_DATA_DISPLAY_SIZE)
+          return unless path
+
           path = path.sub(/\A\/*/, '')
           path = '/' if path.empty?
           name = File.basename(path)
@@ -173,6 +175,8 @@ module Gitlab
         end
 
         def find_by_rugged(repository, sha, path, limit:)
+          return unless path
+
           rugged_commit = repository.lookup(sha)
           root_tree = rugged_commit.tree
 
diff --git a/spec/controllers/projects/avatars_controller_spec.rb b/spec/controllers/projects/avatars_controller_spec.rb
index 3bbe168f6d5..6a41c4d23ea 100644
--- a/spec/controllers/projects/avatars_controller_spec.rb
+++ b/spec/controllers/projects/avatars_controller_spec.rb
@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe Projects::AvatarsController do
-  let(:project) { create(:project, avatar: fixture_file_upload(Rails.root + "spec/fixtures/dk.png", "image/png")) }
+  let(:project) { create(:project, :repository, avatar: fixture_file_upload(Rails.root + "spec/fixtures/dk.png", "image/png")) }
   let(:user)    { create(:user) }
 
   before do
@@ -10,6 +10,12 @@ describe Projects::AvatarsController do
     controller.instance_variable_set(:@project, project)
   end
 
+  it 'GET #show' do
+    get :show, namespace_id: project.namespace.id, project_id: project.id
+
+    expect(response).to have_gitlab_http_status(404)
+  end
+
   it 'removes avatar from DB by calling destroy' do
     delete :destroy, namespace_id: project.namespace.id, project_id: project.id
     expect(project.avatar.present?).to be_falsey
diff --git a/spec/lib/gitlab/git/blob_spec.rb b/spec/lib/gitlab/git/blob_spec.rb
index 07eb5b82d5f..8706c89c147 100644
--- a/spec/lib/gitlab/git/blob_spec.rb
+++ b/spec/lib/gitlab/git/blob_spec.rb
@@ -16,6 +16,18 @@ describe Gitlab::Git::Blob, seed_helper: true do
   end
 
   shared_examples 'finding blobs' do
+    context 'nil path' do
+      let(:blob) { Gitlab::Git::Blob.find(repository, SeedRepo::Commit::ID, nil) }
+
+      it { expect(blob).to eq(nil) }
+    end
+
+    context 'blank path' do
+      let(:blob) { Gitlab::Git::Blob.find(repository, SeedRepo::Commit::ID, '') }
+
+      it { expect(blob).to eq(nil) }
+    end
+
     context 'file in subdir' do
       let(:blob) { Gitlab::Git::Blob.find(repository, SeedRepo::Commit::ID, "files/ruby/popen.rb") }