syz-cluster: improve boot test logging

Collect trace logs and make them accessible via the web UI.

Author: a-nogikh

syz-cluster/workflow/boot-step/main.go

@@ -4,11 +4,14 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"flag"
 	"fmt"
-	"log"
+	"io"
+	"os"
 
+	"github.com/google/syzkaller/pkg/debugtracer"
 	"github.com/google/syzkaller/pkg/instance"
 	"github.com/google/syzkaller/pkg/mgrconfig"
 	"github.com/google/syzkaller/pkg/osutil"
@@ -50,10 +53,16 @@ func main() {
 		app.Fatalf("failed to upload test result: %v", err)
 	}
 
-	bootedFine, err := runTest(ctx, client)
+	output := new(bytes.Buffer)
+	tracer := &debugtracer.GenericTracer{
+		WithTime:    true,
+		TraceWriter: io.MultiWriter(os.Stdout, output),
+	}
+	bootedFine, err := runTest(ctx, client, tracer)
 	if err != nil {
 		app.Fatalf("failed to run the boot test: %v", err)
 	}
+	testResult.Log = output.Bytes()
 	if bootedFine {
 		testResult.Result = api.TestPassed
 	} else {
@@ -79,7 +88,7 @@ const retryCount = 3
 // The base config may have more VMs, but we don't need that many.
 const vmCount = 3
 
-func runTest(ctx context.Context, client *api.Client) (bool, error) {
+func runTest(ctx context.Context, client *api.Client, tracer debugtracer.DebugTracer) (bool, error) {
 	cfg, err := fuzzconfig.GenerateBase(&api.FuzzConfig{})
 	if err != nil {
 		return false, err
@@ -94,18 +103,18 @@ func runTest(ctx context.Context, client *api.Client) (bool, error) {
 
 	var rep *report.Report
 	for i := 0; i < retryCount; i++ {
-		log.Printf("starting attempt #%d", i)
+		tracer.Log("starting attempt #%d", i)
 		var err error
 		rep, err = instance.RunSmokeTest(cfg)
 		if err != nil {
 			return false, err
 		} else if rep == nil {
 			return true, nil
 		}
-		log.Printf("attempt failed: %q", rep.Title)
+		tracer.Log("attempt failed: %q", rep.Title)
 	}
 	if *flagFindings {
-		log.Printf("reporting the finding")
+		tracer.Log("reporting the finding")
 		findingErr := client.UploadFinding(ctx, &api.NewFinding{
 			SessionID: *flagSession,
 			TestName:  *flagTestName,
@@ -117,8 +126,8 @@ func runTest(ctx context.Context, client *api.Client) (bool, error) {
 			return false, fmt.Errorf("failed to report the finding: %w", findingErr)
 		}
 	} else {
-		log.Printf("report:\n%s", rep.Report)
-		log.Printf("output:\n%s", rep.Output)
+		tracer.Log("report:\n%s", rep.Report)
+		tracer.Log("output:\n%s", rep.Output)
 	}
 	return false, nil
 }