testiso.go: Add check for bad console/journal lines

After tests are complete this checks for bad lines in the
console.txt and journal.txt files.

Ref: #3788

Co-authored-by: Dusty Mabe <[email protected]>

mantle/cmd/kola/testiso.go

@@ -729,7 +729,47 @@ func awaitCompletion(ctx context.Context, inst *platform.QemuInstance, outdir st
 		}
 	}()
 	err := <-errchan
-	return time.Since(start), err
+	elapsed := time.Since(start)
+	if err == nil {
+		// No error so far, check the console and journal files
+		consoleFile := filepath.Join(outdir, "console.txt")
+		journalFile := filepath.Join(outdir, "journal.txt")
+		files := []string{consoleFile, journalFile}
+		for _, file := range files {
+			fileName := filepath.Base(file)
+			// Check if the file exists
+			_, err := os.Stat(file)
+			if os.IsNotExist(err) {
+				fmt.Printf("The file: %v does not exist\n", fileName)
+				continue
+			} else if err != nil {
+				fmt.Println(err)
+				return elapsed, err
+			}
+			// Read the contents of the file
+			fileContent, err := os.ReadFile(file)
+			if err != nil {
+				fmt.Println(err)
+				return elapsed, err
+			}
+			// Check for badness with CheckConsole
+			warnOnly, badlines := kola.CheckConsole([]byte(fileContent), nil)
+			if len(badlines) > 0 {
+				for _, badline := range badlines {
+					if warnOnly {
+						plog.Errorf("bad log line detected: %v", badline)
+					} else {
+						plog.Warningf("bad log line detected: %v", badline)
+					}
+				}
+				if !warnOnly {
+					err = fmt.Errorf("errors found in log files")
+					return elapsed, err
+				}
+			}
+		}
+	}
+	return elapsed, err
 }
 
 func printResult(test string, duration time.Duration, err error) bool {