Make CI build eraseable only if build is completed

app/models/ci/build.rb

@@ -205,6 +205,10 @@ module Ci
       end
     end
 
+    def trace_empty?
+      raw_trace.blank?
+    end
+
     def raw_trace
       if File.file?(path_to_trace)
         File.read(path_to_trace)

app/models/ci/build/eraseable.rb

@@ -11,7 +11,7 @@ module Ci
       end
 
       def eraseable?
-        artifacts_file.exists? || File.file?(path_to_trace)
+        complete? && (artifacts_file.exists? || !trace_empty?)
       end
 
       def erase_url

spec/models/ci/build/eraseable_spec.rb

@@ -20,7 +20,7 @@ describe Ci::Build::Eraseable, models: true do
   end
 
   context 'build is eraseable' do
-    let!(:build) { create(:ci_build_with_trace, :artifacts) }
+    let!(:build) { create(:ci_build_with_trace, :success, :artifacts) }
 
     describe '#erase!' do
       before { build.erase! }
@@ -49,7 +49,7 @@ describe Ci::Build::Eraseable, models: true do
     end
 
     context 'metadata and build trace are not available' do
-      let!(:build) { create(:ci_build, :artifacts) }
+      let!(:build) { create(:ci_build, :success, :artifacts) }
       before { build.remove_artifacts_metadata! }
 
       describe '#erase!' do