Add latest changes from gitlab-org/security/gitlab@16-2-stable-ee

9 files changed, 312 insertions, 69 deletions

diff --git a/spec/lib/gitlab/ci/decompressed_gzip_size_validator_spec.rb b/spec/lib/gitlab/ci/decompressed_gzip_size_validator_spec.rb
index 6ca3f4d415e..dad5bd2548b 100644
--- a/spec/lib/gitlab/ci/decompressed_gzip_size_validator_spec.rb
+++ b/spec/lib/gitlab/ci/decompressed_gzip_size_validator_spec.rb
@@ -105,6 +105,16 @@ RSpec.describe Gitlab::Ci::DecompressedGzipSizeValidator, feature_category: :imp
       end
     end
 
+    context 'when archive path has multiple hard links' do
+      before do
+        FileUtils.link(filepath, File.join(Dir.mktmpdir, 'hard_link'))
+      end
+
+      it 'returns false' do
+        expect(subject).not_to be_valid
+      end
+    end
+
     context 'when archive path is not a file' do
       let(:filepath) { Dir.mktmpdir }
       let(:filesize) { File.size(filepath) }
diff --git a/spec/lib/gitlab/github_import/attachments_downloader_spec.rb b/spec/lib/gitlab/github_import/attachments_downloader_spec.rb
index 84d6713efdb..086aa4be17e 100644
--- a/spec/lib/gitlab/github_import/attachments_downloader_spec.rb
+++ b/spec/lib/gitlab/github_import/attachments_downloader_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe Gitlab::GithubImport::AttachmentsDownloader do
+RSpec.describe Gitlab::GithubImport::AttachmentsDownloader, feature_category: :importers do
   subject(:downloader) { described_class.new(file_url) }
 
   let_it_be(:file_url) { 'https://example.com/avatar.png' }
@@ -39,6 +39,26 @@ RSpec.describe Gitlab::GithubImport::AttachmentsDownloader do
       end
     end
 
+    context 'when file shares multiple hard links' do
+      let(:tmpdir) { Dir.mktmpdir }
+      let(:hard_link) { File.join(tmpdir, 'hard_link') }
+
+      before do
+        existing_file = File.join(tmpdir, 'file.txt')
+        FileUtils.touch(existing_file)
+        FileUtils.link(existing_file, hard_link)
+        allow(downloader).to receive(:filepath).and_return(hard_link)
+      end
+
+      it 'raises expected exception' do
+        expect(Gitlab::Utils::FileInfo).to receive(:linked?).with(hard_link).and_call_original
+        expect { downloader.perform }.to raise_exception(
+          described_class::DownloadError,
+          'Invalid downloaded file'
+        )
+      end
+    end
+
     context 'when filename is malicious' do
       let_it_be(:file_url) { 'https://example.com/ava%2F..%2Ftar.png' }
 
diff --git a/spec/lib/gitlab/import_export/command_line_util_spec.rb b/spec/lib/gitlab/import_export/command_line_util_spec.rb
index 91cfab1688a..b2e047f5621 100644
--- a/spec/lib/gitlab/import_export/command_line_util_spec.rb
+++ b/spec/lib/gitlab/import_export/command_line_util_spec.rb
@@ -5,13 +5,16 @@ require 'spec_helper'
 RSpec.describe Gitlab::ImportExport::CommandLineUtil, feature_category: :importers do
   include ExportFileHelper
 
-  let(:path) { "#{Dir.tmpdir}/symlink_test" }
-  let(:archive) { 'spec/fixtures/symlink_export.tar.gz' }
   let(:shared) { Gitlab::ImportExport::Shared.new(nil) }
-  let(:tmpdir) { Dir.mktmpdir }
+  # Separate where files are written during this test by their kind, to avoid them interfering with each other:
+  # - `source_dir` Dir to compress files from.
+  # - `target_dir` Dir to decompress archived files into.
+  # - `archive_dir` Dir to write any archive files to.
+  let(:source_dir) { Dir.mktmpdir }
+  let(:target_dir) { Dir.mktmpdir }
   let(:archive_dir) { Dir.mktmpdir }
 
-  subject do
+  subject(:mock_class) do
     Class.new do
       include Gitlab::ImportExport::CommandLineUtil
 
@@ -25,38 +28,59 @@ RSpec.describe Gitlab::ImportExport::CommandLineUtil, feature_category: :importe
   end
 
   before do
-    FileUtils.mkdir_p(path)
+    FileUtils.mkdir_p(source_dir)
   end
 
   after do
-    FileUtils.rm_rf(path)
+    FileUtils.rm_rf(source_dir)
+    FileUtils.rm_rf(target_dir)
     FileUtils.rm_rf(archive_dir)
-    FileUtils.remove_entry(tmpdir)
   end
 
   shared_examples 'deletes symlinks' do |compression, decompression|
     it 'deletes the symlinks', :aggregate_failures do
-      Dir.mkdir("#{tmpdir}/.git")
-      Dir.mkdir("#{tmpdir}/folder")
-      FileUtils.touch("#{tmpdir}/file.txt")
-      FileUtils.touch("#{tmpdir}/folder/file.txt")
-      FileUtils.touch("#{tmpdir}/.gitignore")
-      FileUtils.touch("#{tmpdir}/.git/config")
-      File.symlink('file.txt', "#{tmpdir}/.symlink")
-      File.symlink('file.txt', "#{tmpdir}/.git/.symlink")
-      File.symlink('file.txt', "#{tmpdir}/folder/.symlink")
-      archive = File.join(archive_dir, 'archive')
-      subject.public_send(compression, archive: archive, dir: tmpdir)
-
-      subject.public_send(decompression, archive: archive, dir: archive_dir)
-
-      expect(File.exist?("#{archive_dir}/file.txt")).to eq(true)
-      expect(File.exist?("#{archive_dir}/folder/file.txt")).to eq(true)
-      expect(File.exist?("#{archive_dir}/.gitignore")).to eq(true)
-      expect(File.exist?("#{archive_dir}/.git/config")).to eq(true)
-      expect(File.exist?("#{archive_dir}/.symlink")).to eq(false)
-      expect(File.exist?("#{archive_dir}/.git/.symlink")).to eq(false)
-      expect(File.exist?("#{archive_dir}/folder/.symlink")).to eq(false)
+      Dir.mkdir("#{source_dir}/.git")
+      Dir.mkdir("#{source_dir}/folder")
+      FileUtils.touch("#{source_dir}/file.txt")
+      FileUtils.touch("#{source_dir}/folder/file.txt")
+      FileUtils.touch("#{source_dir}/.gitignore")
+      FileUtils.touch("#{source_dir}/.git/config")
+      File.symlink('file.txt', "#{source_dir}/.symlink")
+      File.symlink('file.txt', "#{source_dir}/.git/.symlink")
+      File.symlink('file.txt', "#{source_dir}/folder/.symlink")
+      archive_file = File.join(archive_dir, 'symlink_archive.tar.gz')
+      subject.public_send(compression, archive: archive_file, dir: source_dir)
+      subject.public_send(decompression, archive: archive_file, dir: target_dir)
+
+      expect(File).to exist("#{target_dir}/file.txt")
+      expect(File).to exist("#{target_dir}/folder/file.txt")
+      expect(File).to exist("#{target_dir}/.gitignore")
+      expect(File).to exist("#{target_dir}/.git/config")
+      expect(File).not_to exist("#{target_dir}/.symlink")
+      expect(File).not_to exist("#{target_dir}/.git/.symlink")
+      expect(File).not_to exist("#{target_dir}/folder/.symlink")
+    end
+  end
+
+  shared_examples 'handles shared hard links' do |compression, decompression|
+    let(:archive_file) { File.join(archive_dir, 'hard_link_archive.tar.gz') }
+
+    subject(:decompress) { mock_class.public_send(decompression, archive: archive_file, dir: target_dir) }
+
+    before do
+      Dir.mkdir("#{source_dir}/dir")
+      FileUtils.touch("#{source_dir}/file.txt")
+      FileUtils.touch("#{source_dir}/dir/.file.txt")
+      FileUtils.link("#{source_dir}/file.txt", "#{source_dir}/.hard_linked_file.txt")
+
+      mock_class.public_send(compression, archive: archive_file, dir: source_dir)
+    end
+
+    it 'raises an exception and deletes the extraction dir', :aggregate_failures do
+      expect(FileUtils).to receive(:remove_dir).with(target_dir).and_call_original
+      expect(Dir).to exist(target_dir)
+      expect { decompress }.to raise_error(described_class::HardLinkError)
+      expect(Dir).not_to exist(target_dir)
     end
   end
 
@@ -212,6 +236,8 @@ RSpec.describe Gitlab::ImportExport::CommandLineUtil, feature_category: :importe
   end
 
   describe '#gzip' do
+    let(:path) { source_dir }
+
     it 'compresses specified file' do
       tempfile = Tempfile.new('test', path)
       filename = File.basename(tempfile.path)
@@ -229,14 +255,16 @@ RSpec.describe Gitlab::ImportExport::CommandLineUtil, feature_category: :importe
   end
 
   describe '#gunzip' do
+    let(:path) { source_dir }
+
     it 'decompresses specified file' do
       filename = 'labels.ndjson.gz'
       gz_filepath = "spec/fixtures/bulk_imports/gz/#{filename}"
-      FileUtils.copy_file(gz_filepath, File.join(tmpdir, filename))
+      FileUtils.copy_file(gz_filepath, File.join(path, filename))
 
-      subject.gunzip(dir: tmpdir, filename: filename)
+      subject.gunzip(dir: path, filename: filename)
 
-      expect(File.exist?(File.join(tmpdir, 'labels.ndjson'))).to eq(true)
+      expect(File.exist?(File.join(path, 'labels.ndjson'))).to eq(true)
     end
 
     context 'when exception occurs' do
@@ -250,7 +278,7 @@ RSpec.describe Gitlab::ImportExport::CommandLineUtil, feature_category: :importe
     it 'archives a folder without compression' do
       archive_file = File.join(archive_dir, 'archive.tar')
 
-      result = subject.tar_cf(archive: archive_file, dir: tmpdir)
+      result = subject.tar_cf(archive: archive_file, dir: source_dir)
 
       expect(result).to eq(true)
       expect(File.exist?(archive_file)).to eq(true)
@@ -270,29 +298,35 @@ RSpec.describe Gitlab::ImportExport::CommandLineUtil, feature_category: :importe
   end
 
   describe '#untar_zxf' do
+    let(:tar_archive_fixture) { 'spec/fixtures/symlink_export.tar.gz' }
+
     it_behaves_like 'deletes symlinks', :tar_czf, :untar_zxf
+    it_behaves_like 'handles shared hard links', :tar_czf, :untar_zxf
 
     it 'has the right mask for project.json' do
-      subject.untar_zxf(archive: archive, dir: path)
+      subject.untar_zxf(archive: tar_archive_fixture, dir: target_dir)
 
-      expect(file_permissions("#{path}/project.json")).to eq(0755) # originally 777
+      expect(file_permissions("#{target_dir}/project.json")).to eq(0755) # originally 777
     end
 
     it 'has the right mask for uploads' do
-      subject.untar_zxf(archive: archive, dir: path)
+      subject.untar_zxf(archive: tar_archive_fixture, dir: target_dir)
 
-      expect(file_permissions("#{path}/uploads")).to eq(0755) # originally 555
+      expect(file_permissions("#{target_dir}/uploads")).to eq(0755) # originally 555
     end
   end
 
   describe '#untar_xf' do
+    let(:tar_archive_fixture) { 'spec/fixtures/symlink_export.tar.gz' }
+
     it_behaves_like 'deletes symlinks', :tar_cf, :untar_xf
+    it_behaves_like 'handles shared hard links', :tar_cf, :untar_xf
 
     it 'extracts archive without decompression' do
       filename = 'archive.tar.gz'
       archive_file = File.join(archive_dir, 'archive.tar')
 
-      FileUtils.copy_file(archive, File.join(archive_dir, filename))
+      FileUtils.copy_file(tar_archive_fixture, File.join(archive_dir, filename))
       subject.gunzip(dir: archive_dir, filename: filename)
 
       result = subject.untar_xf(archive: archive_file, dir: archive_dir)
diff --git a/spec/lib/gitlab/import_export/decompressed_archive_size_validator_spec.rb b/spec/lib/gitlab/import_export/decompressed_archive_size_validator_spec.rb
index a6cb74c3c9f..8c5823edc51 100644
--- a/spec/lib/gitlab/import_export/decompressed_archive_size_validator_spec.rb
+++ b/spec/lib/gitlab/import_export/decompressed_archive_size_validator_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe Gitlab::ImportExport::DecompressedArchiveSizeValidator do
+RSpec.describe Gitlab::ImportExport::DecompressedArchiveSizeValidator, feature_category: :importers do
   let_it_be(:filepath) { File.join(Dir.tmpdir, 'decompressed_archive_size_validator_spec.gz') }
 
   before(:all) do
@@ -121,7 +121,7 @@ RSpec.describe Gitlab::ImportExport::DecompressedArchiveSizeValidator do
 
       context 'which archive path is a symlink' do
         let(:filepath) { File.join(Dir.tmpdir, 'symlink') }
-        let(:error_message) { 'Archive path is a symlink' }
+        let(:error_message) { 'Archive path is a symlink or hard link' }
 
         before do
           FileUtils.ln_s(filepath, filepath, force: true)
@@ -132,6 +132,19 @@ RSpec.describe Gitlab::ImportExport::DecompressedArchiveSizeValidator do
         end
       end
 
+      context 'when archive path shares multiple hard links' do
+        let(:filesize) { 32 }
+        let(:error_message) { 'Archive path is a symlink or hard link' }
+
+        before do
+          FileUtils.link(filepath, File.join(Dir.mktmpdir, 'hard_link'))
+        end
+
+        it 'returns false' do
+          expect(subject).not_to be_valid
+        end
+      end
+
       context 'when archive path is not a file' do
         let(:filepath) { Dir.mktmpdir }
         let(:filesize) { File.size(filepath) }
diff --git a/spec/lib/gitlab/import_export/file_importer_spec.rb b/spec/lib/gitlab/import_export/file_importer_spec.rb
index 5a75631ec4d..aff11f7ac30 100644
--- a/spec/lib/gitlab/import_export/file_importer_spec.rb
+++ b/spec/lib/gitlab/import_export/file_importer_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe Gitlab::ImportExport::FileImporter do
+RSpec.describe Gitlab::ImportExport::FileImporter, feature_category: :importers do
   include ExportFileHelper
 
   let(:shared) { Gitlab::ImportExport::Shared.new(nil) }
@@ -113,28 +113,73 @@ RSpec.describe Gitlab::ImportExport::FileImporter do
   end
 
   context 'error' do
+    subject(:import) { described_class.import(importable: build(:project), archive_file: '', shared: shared) }
+
     before do
       allow_next_instance_of(described_class) do |instance|
-        allow(instance).to receive(:wait_for_archived_file).and_raise(StandardError)
+        allow(instance).to receive(:wait_for_archived_file).and_raise(StandardError, 'foo')
       end
-      described_class.import(importable: build(:project), archive_file: '', shared: shared)
     end
 
     it 'removes symlinks in root folder' do
+      import
+
       expect(File.exist?(symlink_file)).to be false
     end
 
     it 'removes hidden symlinks in root folder' do
+      import
+
       expect(File.exist?(hidden_symlink_file)).to be false
     end
 
     it 'removes symlinks in subfolders' do
+      import
+
       expect(File.exist?(subfolder_symlink_file)).to be false
     end
 
     it 'does not remove a valid file' do
+      import
+
       expect(File.exist?(valid_file)).to be true
     end
+
+    it 'returns false and sets an error on shared' do
+      result = import
+
+      expect(result).to eq(false)
+      expect(shared.errors.join).to eq('foo')
+    end
+
+    context 'when files in the archive share hard links' do
+      let(:hard_link_file) { "#{shared.export_path}/hard_link_file.txt" }
+
+      before do
+        FileUtils.link(valid_file, hard_link_file)
+      end
+
+      it 'returns false and sets an error on shared' do
+        result = import
+
+        expect(result).to eq(false)
+        expect(shared.errors.join).to eq('File shares hard link')
+      end
+
+      it 'removes all files in export path' do
+        expect(Dir).to exist(shared.export_path)
+        expect(File).to exist(symlink_file)
+        expect(File).to exist(hard_link_file)
+        expect(File).to exist(valid_file)
+
+        import
+
+        expect(File).not_to exist(symlink_file)
+        expect(File).not_to exist(hard_link_file)
+        expect(File).not_to exist(valid_file)
+        expect(Dir).not_to exist(shared.export_path)
+      end
+    end
   end
 
   context 'when file exceeds acceptable decompressed size' do
@@ -157,8 +202,10 @@ RSpec.describe Gitlab::ImportExport::FileImporter do
         allow(Gitlab::ImportExport::DecompressedArchiveSizeValidator).to receive(:max_bytes).and_return(1)
       end
 
-      it 'returns false' do
-        expect(subject.import).to eq(false)
+      it 'returns false and sets an error on shared' do
+        result = subject.import
+
+        expect(result).to eq(false)
         expect(shared.errors.join).to eq('Decompressed archive size validation failed.')
       end
     end
diff --git a/spec/lib/gitlab/import_export/json/ndjson_reader_spec.rb b/spec/lib/gitlab/import_export/json/ndjson_reader_spec.rb
index 98afe01c08b..1f98a9efb7d 100644
--- a/spec/lib/gitlab/import_export/json/ndjson_reader_spec.rb
+++ b/spec/lib/gitlab/import_export/json/ndjson_reader_spec.rb
@@ -35,16 +35,22 @@ RSpec.describe Gitlab::ImportExport::Json::NdjsonReader, feature_category: :impo
       expect(subject).to eq(root_tree)
     end
 
-    context 'when project.json is symlink' do
-      it 'raises error an error' do
-        Dir.mktmpdir do |tmpdir|
-          FileUtils.touch(File.join(tmpdir, 'passwd'))
-          File.symlink(File.join(tmpdir, 'passwd'), File.join(tmpdir, 'project.json'))
+    context 'when project.json is symlink or hard link' do
+      using RSpec::Parameterized::TableSyntax
 
-          ndjson_reader = described_class.new(tmpdir)
+      where(:link_method) { [:link, :symlink] }
 
-          expect { ndjson_reader.consume_attributes(importable_path) }
-            .to raise_error(Gitlab::ImportExport::Error, 'Invalid file')
+      with_them do
+        it 'raises an error' do
+          Dir.mktmpdir do |tmpdir|
+            FileUtils.touch(File.join(tmpdir, 'passwd'))
+            FileUtils.send(link_method, File.join(tmpdir, 'passwd'), File.join(tmpdir, 'project.json'))
+
+            ndjson_reader = described_class.new(tmpdir)
+
+            expect { ndjson_reader.consume_attributes(importable_path) }
+              .to raise_error(Gitlab::ImportExport::Error, 'Invalid file')
+          end
         end
       end
     end
@@ -97,18 +103,24 @@ RSpec.describe Gitlab::ImportExport::Json::NdjsonReader, feature_category: :impo
         end
       end
 
-      context 'when relation file is a symlink' do
-        it 'yields nothing to the Enumerator' do
-          Dir.mktmpdir do |tmpdir|
-            Dir.mkdir(File.join(tmpdir, 'project'))
-            File.write(File.join(tmpdir, 'passwd'), "{}\n{}")
-            File.symlink(File.join(tmpdir, 'passwd'), File.join(tmpdir, 'project', 'issues.ndjson'))
+      context 'when relation file is a symlink or hard link' do
+        using RSpec::Parameterized::TableSyntax
 
-            ndjson_reader = described_class.new(tmpdir)
+        where(:link_method) { [:link, :symlink] }
+
+        with_them do
+          it 'yields nothing to the Enumerator' do
+            Dir.mktmpdir do |tmpdir|
+              Dir.mkdir(File.join(tmpdir, 'project'))
+              File.write(File.join(tmpdir, 'passwd'), "{}\n{}")
+              FileUtils.send(link_method, File.join(tmpdir, 'passwd'), File.join(tmpdir, 'project', 'issues.ndjson'))
+
+              ndjson_reader = described_class.new(tmpdir)
 
-            result = ndjson_reader.consume_relation(importable_path, 'issues')
+              result = ndjson_reader.consume_relation(importable_path, 'issues')
 
-            expect(result.to_a).to eq([])
+              expect(result.to_a).to eq([])
+            end
           end
         end
       end
diff --git a/spec/lib/gitlab/import_export/recursive_merge_folders_spec.rb b/spec/lib/gitlab/import_export/recursive_merge_folders_spec.rb
index cb8ac088493..2b9590da421 100644
--- a/spec/lib/gitlab/import_export/recursive_merge_folders_spec.rb
+++ b/spec/lib/gitlab/import_export/recursive_merge_folders_spec.rb
@@ -4,15 +4,17 @@ require 'spec_helper'
 
 RSpec.describe Gitlab::ImportExport::RecursiveMergeFolders do
   describe '.merge' do
-    it 'merge folder and ignore symlinks' do
+    it 'merges folder and ignores symlinks and files that share hard links' do
       Dir.mktmpdir do |tmpdir|
         source = "#{tmpdir}/source"
         FileUtils.mkdir_p("#{source}/folder/folder")
         FileUtils.touch("#{source}/file1.txt")
+        FileUtils.touch("#{source}/file_that_shares_hard_links.txt")
         FileUtils.touch("#{source}/folder/file2.txt")
         FileUtils.touch("#{source}/folder/folder/file3.txt")
         FileUtils.ln_s("#{source}/file1.txt", "#{source}/symlink-file1.txt")
         FileUtils.ln_s("#{source}/folder", "#{source}/symlink-folder")
+        FileUtils.link("#{source}/file_that_shares_hard_links.txt", "#{source}/hard_link.txt")
 
         target = "#{tmpdir}/target"
         FileUtils.mkdir_p("#{target}/folder/folder")
diff --git a/spec/lib/gitlab/pages/virtual_host_finder_spec.rb b/spec/lib/gitlab/pages/virtual_host_finder_spec.rb
index 4b584a45503..49eee772f8d 100644
--- a/spec/lib/gitlab/pages/virtual_host_finder_spec.rb
+++ b/spec/lib/gitlab/pages/virtual_host_finder_spec.rb
@@ -9,6 +9,10 @@ RSpec.describe Gitlab::Pages::VirtualHostFinder, feature_category: :pages do
     project.update_pages_deployment!(create(:pages_deployment, project: project))
   end
 
+  before do
+    stub_pages_setting(host: 'example.com')
+  end
+
   it 'returns nil when host is empty' do
     expect(described_class.new(nil).execute).to be_nil
     expect(described_class.new('').execute).to be_nil
@@ -69,7 +73,7 @@ RSpec.describe Gitlab::Pages::VirtualHostFinder, feature_category: :pages do
       end
 
       it 'returns the virual domain with no lookup_paths' do
-        virtual_domain = described_class.new("#{project.namespace.path}.#{Settings.pages.host}").execute
+        virtual_domain = described_class.new("#{project.namespace.path}.example.com").execute
 
         expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
         expect(virtual_domain.cache_key).to match(/pages_domain_for_namespace_#{project.namespace.id}_/)
@@ -82,7 +86,7 @@ RSpec.describe Gitlab::Pages::VirtualHostFinder, feature_category: :pages do
         end
 
         it 'returns the virual domain with no lookup_paths' do
-          virtual_domain = described_class.new("#{project.namespace.path}.#{Settings.pages.host}".downcase).execute
+          virtual_domain = described_class.new("#{project.namespace.path}.example.com".downcase).execute
 
           expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
           expect(virtual_domain.cache_key).to be_nil
@@ -104,7 +108,7 @@ RSpec.describe Gitlab::Pages::VirtualHostFinder, feature_category: :pages do
       end
 
       it 'returns the virual domain when there are pages deployed for the project' do
-        virtual_domain = described_class.new("#{project.namespace.path}.#{Settings.pages.host}").execute
+        virtual_domain = described_class.new("#{project.namespace.path}.example.com").execute
 
         expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
         expect(virtual_domain.cache_key).to match(/pages_domain_for_namespace_#{project.namespace.id}_/)
@@ -113,7 +117,7 @@ RSpec.describe Gitlab::Pages::VirtualHostFinder, feature_category: :pages do
       end
 
       it 'finds domain with case-insensitive' do
-        virtual_domain = described_class.new("#{project.namespace.path}.#{Settings.pages.host.upcase}").execute
+        virtual_domain = described_class.new("#{project.namespace.path}.Example.com").execute
 
         expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
         expect(virtual_domain.cache_key).to match(/pages_domain_for_namespace_#{project.namespace.id}_/)
@@ -127,7 +131,7 @@ RSpec.describe Gitlab::Pages::VirtualHostFinder, feature_category: :pages do
         end
 
         it 'returns the virual domain when there are pages deployed for the project' do
-          virtual_domain = described_class.new("#{project.namespace.path}.#{Settings.pages.host}").execute
+          virtual_domain = described_class.new("#{project.namespace.path}.example.com").execute
 
           expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
           expect(virtual_domain.cache_key).to be_nil
@@ -143,7 +147,7 @@ RSpec.describe Gitlab::Pages::VirtualHostFinder, feature_category: :pages do
       project.project_setting.update!(pages_unique_domain: 'unique-domain')
     end
 
-    subject(:virtual_domain) { described_class.new("unique-domain.#{Settings.pages.host.upcase}").execute }
+    subject(:virtual_domain) { described_class.new('unique-domain.example.com').execute }
 
     context 'when pages unique domain is enabled' do
       before_all do
@@ -171,6 +175,19 @@ RSpec.describe Gitlab::Pages::VirtualHostFinder, feature_category: :pages do
           expect(virtual_domain.lookup_paths.first.project_id).to eq(project.id)
         end
 
+        context 'when a project path conflicts with a unique domain' do
+          it 'prioritizes the unique domain project' do
+            group = create(:group, path: 'unique-domain')
+            other_project = build(:project, path: 'unique-domain.example.com', group: group)
+            other_project.save!(validate: false)
+            other_project.update_pages_deployment!(create(:pages_deployment, project: other_project))
+            other_project.mark_pages_as_deployed
+
+            expect(virtual_domain).to be_an_instance_of(Pages::VirtualDomain)
+            expect(virtual_domain.lookup_paths.first.project_id).to eq(project.id)
+          end
+        end
+
         context 'when :cache_pages_domain_api is disabled' do
           before do
             stub_feature_flags(cache_pages_domain_api: false)
diff --git a/spec/lib/gitlab/utils/file_info_spec.rb b/spec/lib/gitlab/utils/file_info_spec.rb
new file mode 100644
index 00000000000..480036b2fd0
--- /dev/null
+++ b/spec/lib/gitlab/utils/file_info_spec.rb
@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+RSpec.describe Gitlab::Utils::FileInfo, feature_category: :shared do
+  let(:tmpdir) { Dir.mktmpdir }
+  let(:file_path) { "#{tmpdir}/test.txt" }
+
+  before do
+    FileUtils.touch(file_path)
+  end
+
+  after do
+    FileUtils.rm_rf(tmpdir)
+  end
+
+  describe '.linked?' do
+    it 'raises an error when file does not exist' do
+      expect { subject.linked?('foo') }.to raise_error(Errno::ENOENT)
+    end
+
+    shared_examples 'identifies a linked file' do
+      it 'returns false when file or dir is not a link' do
+        expect(subject.linked?(tmpdir)).to eq(false)
+        expect(subject.linked?(file)).to eq(false)
+      end
+
+      it 'returns true when file or dir is symlinked' do
+        FileUtils.symlink(tmpdir, "#{tmpdir}/symlinked_dir")
+        FileUtils.symlink(file_path, "#{tmpdir}/symlinked_file.txt")
+
+        expect(subject.linked?("#{tmpdir}/symlinked_dir")).to eq(true)
+        expect(subject.linked?("#{tmpdir}/symlinked_file.txt")).to eq(true)
+      end
+
+      it 'returns true when file has more than one hard link' do
+        FileUtils.link(file_path, "#{tmpdir}/hardlinked_file.txt")
+
+        expect(subject.linked?(file)).to eq(true)
+        expect(subject.linked?("#{tmpdir}/hardlinked_file.txt")).to eq(true)
+      end
+    end
+
+    context 'when file is a File::Stat' do
+      let(:file) { File.lstat(file_path) }
+
+      it_behaves_like 'identifies a linked file'
+    end
+
+    context 'when file is path' do
+      let(:file) { file_path }
+
+      it_behaves_like 'identifies a linked file'
+    end
+  end
+
+  describe '.shares_hard_link?' do
+    it 'raises an error when file does not exist' do
+      expect { subject.shares_hard_link?('foo') }.to raise_error(Errno::ENOENT)
+    end
+
+    shared_examples 'identifies a file that shares a hard link' do
+      it 'returns false when file or dir does not share hard links' do
+        expect(subject.shares_hard_link?(tmpdir)).to eq(false)
+        expect(subject.shares_hard_link?(file)).to eq(false)
+      end
+
+      it 'returns true when file has more than one hard link' do
+        FileUtils.link(file_path, "#{tmpdir}/hardlinked_file.txt")
+
+        expect(subject.shares_hard_link?(file)).to eq(true)
+        expect(subject.shares_hard_link?("#{tmpdir}/hardlinked_file.txt")).to eq(true)
+      end
+    end
+
+    context 'when file is a File::Stat' do
+      let(:file) { File.lstat(file_path) }
+
+      it_behaves_like 'identifies a file that shares a hard link'
+    end
+
+    context 'when file is path' do
+      let(:file) { file_path }
+
+      it_behaves_like 'identifies a file that shares a hard link'
+    end
+  end
+end