Correct syscall host logging (#143)

Author: mjkw31

cmd/stat.go

@@ -193,11 +193,7 @@ func scanAndStatInput(input, output *os.File, tsvPath string, debug bool, maximu
 	var statter stat.Statter = stat.WithTimeout(lstatTimeout, lstatAttempts, lstatConsecutiveFails, appLogger)
 
 	if recordStats > 0 {
-		rstatter, err := startSyscallLogging(statter, filepath.Base(input.Name()))
-		if err != nil {
-			die("%s", err)
-		}
-
+		rstatter := startSyscallLogging(statter, filepath.Base(input.Name()))
 		ctx, stop := context.WithCancel(context.Background())
 
 		defer rstatter.Start(ctx)()
@@ -216,17 +212,21 @@ func scanAndStatInput(input, output *os.File, tsvPath string, debug bool, maximu
 	doScanAndStat(statter, pConfig, input, output, tsvPath)
 }
 
-func startSyscallLogging(statter stat.Statter, file string) (*stat.StatsRecorder, error) {
+func logSyscallHost(file string) error {
 	host, err := os.Hostname()
 	if err != nil {
-		return nil, fmt.Errorf("failed to get hostname: %w", err)
+		return fmt.Errorf("failed to get hostname: %w", err)
 	}
 
 	appLogger.Info("syscall logging", "host", host, "file", file)
 
+	return nil
+}
+
+func startSyscallLogging(statter stat.Statter, file string) *stat.StatsRecorder {
 	return stat.RecordStats(statter, time.Duration(recordStats)*time.Minute, func(t time.Time, u uint64) {
 		appLogger.Info("syscalls", "time", t, "file", file, "stats", u)
-	}), nil
+	})
 }
 
 func doScanAndStat(statter stat.Statter, pConfig stat.PathsConfig, input, output *os.File, tsvPath string) {
@@ -242,6 +242,10 @@ func doScanAndStat(statter stat.Statter, pConfig stat.PathsConfig, input, output
 
 	logToFile(input.Name() + statLogOutputFileSuffix)
 
+	if err := logSyscallHost(input.Name()); err != nil {
+		die("%s", err)
+	}
+
 	if err := p.Scan(input); err != nil {
 		die("%s", err)
 	}