[fix] Report the unit in a single scan job (#4209)

* [fix] Report the unit in a single scan job

* Eliminate divide by 0 possibility

pkg/sources/job_progress.go

@@ -355,6 +355,10 @@ func (m JobProgressMetrics) PercentComplete() int {
 		// Fallback to the source's self-reported percent complete if
 		// the unit information isn't available.
 		return int(m.SourcePercent)
+	} else if den == 0 {
+		// This should never happen. Return an invalid value so we can
+		// trace it back to here if we ever see it.
+		return -1
 	}
 	return int(num * 100 / den)
 }

pkg/sources/source_manager.go

@@ -417,6 +417,7 @@ func (s *SourceManager) scan(ctx context.Context, source Source, report *JobProg
 		}
 	}()
 
+	report.ReportUnit(unit)
 	report.TrackProgress(source.GetProgress())
 	if ctx.Value("job_id") == "" {
 		ctx = context.WithValue(ctx, "job_id", report.JobID)