dashboard: include label message into bug reports

dashboard/app/mail_bug.txt

@@ -40,6 +40,10 @@ bisection log:  {{.BisectCause.LogLink}}
 Reported-by: {{.CreditEmail}}
 {{if .BisectCause}}{{if .BisectCause.Commit}}Fixes: {{formatTagHash .BisectCause.Commit.Hash}} ("{{.BisectCause.Commit.Title}}")
 {{end}}{{end}}
+{{- range $label, $text := .LabelMessages}}
+{{$text}}
+
+{{end}}
 {{printf "%s" .Report}}
 
 ---

dashboard/app/reporting.go

@@ -547,6 +547,16 @@ func crashBugReport(c context.Context, bug *Bug, crash *Crash, crashKey *db.Key,
 			rep.Maintainers = append(rep.Maintainers, mgr.CC.BuildMaintainers...)
 		}
 	}
+	for _, label := range bug.Labels {
+		text, ok := reporting.Labels[label.String()]
+		if !ok {
+			continue
+		}
+		if rep.LabelMessages == nil {
+			rep.LabelMessages = map[string]string{}
+		}
+		rep.LabelMessages[label.String()] = text
+	}
 	if err := fillBugReport(c, rep, bug, bugReporting, build); err != nil {
 		return nil, err
 	}
@@ -1071,8 +1081,8 @@ func incomingCommandCmd(c context.Context, now time.Time, cmd *dashapi.BugUpdate
 	if cmd.StatusReason != "" {
 		bug.StatusReason = cmd.StatusReason
 	}
-	if cmd.Label != "" {
-		bugReporting.AddLabel(cmd.Label)
+	for _, label := range cmd.Labels {
+		bugReporting.AddLabel(label)
 	}
 	return true, "", nil
 }

dashboard/app/reporting_email.go

@@ -165,6 +165,9 @@ func emailSendBugReport(c context.Context, rep *dashapi.BugReport) error {
 	} else if len(rep.ReproSyz) != 0 {
 		cmd.ReproLevel = dashapi.ReproLevelSyz
 	}
+	for label := range rep.LabelMessages {
+		cmd.Labels = append(cmd.Labels, label)
+	}
 	ok, reason, err := incomingCommand(c, cmd)
 	if !ok || err != nil {
 		return fmt.Errorf("failed to update reported bug: ok=%v reason=%v err=%v", ok, reason, err)
@@ -253,9 +256,11 @@ func emailSendBugNotif(c context.Context, notif *dashapi.BugNotification) error
 		ID:           notif.ID,
 		Status:       status,
 		StatusReason: statusReason,
-		Label:        notif.Label,
 		Notification: true,
 	}
+	if notif.Label != "" {
+		cmd.Labels = []string{notif.Label}
+	}
 	ok, reason, err := incomingCommand(c, cmd)
 	if !ok || err != nil {
 		return fmt.Errorf("notif update failed: ok=%v reason=%v err=%v", ok, reason, err)

dashboard/app/tree_test.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/syzkaller/dashboard/dashapi"
+	"github.com/stretchr/testify/assert"
 	db "google.golang.org/appengine/v2/datastore"
 	aemail "google.golang.org/appengine/v2/mail"
 )
@@ -38,6 +39,7 @@ func TestTreeOriginDownstream(t *testing.T) {
 			results: []treeTestEntryPeriod{{fromDay: 0, result: treeTestOK}},
 		},
 	}
+	ctx.reportToEmail()
 	ctx.jobTestDays = []int{10}
 	ctx.moveToDay(10)
 	ctx.ensureLabels(`origin:downstream`)
@@ -49,7 +51,6 @@ func TestTreeOriginDownstream(t *testing.T) {
 	_, err := c.GET(ctx.bugLink())
 	c.expectEQ(err, nil)
 	// Test that we receive a notification.
-	ctx.reportToEmail()
 	msg := ctx.emailWithoutURLs()
 	c.expectEQ(msg.Body, `Bug presence analysis results: the bug reproduces only on the downstream tree.
 
@@ -71,6 +72,45 @@ More details can be found at:
 `)
 }
 
+func TestTreeOriginDownstreamEmail(t *testing.T) {
+	c := NewCtx(t)
+	defer c.Close()
+
+	ctx := setUpTreeTest(c, downstreamUpstreamRepos)
+	ctx.uploadBug(`https://downstream.repo/repo`, `master`, dashapi.ReproLevelC)
+	ctx.entries = []treeTestEntry{
+		{
+			alias:   `downstream`,
+			results: []treeTestEntryPeriod{{fromDay: 0, result: treeTestCrash}},
+		},
+		{
+			alias:      `lts`,
+			mergeAlias: `downstream`,
+			results:    []treeTestEntryPeriod{{fromDay: 0, result: treeTestOK}},
+		},
+		{
+			alias:   `upstream`,
+			results: []treeTestEntryPeriod{{fromDay: 0, result: treeTestOK}},
+		},
+	}
+	ctx.jobTestDays = []int{10}
+	ctx.moveToDay(10)
+
+	// The report must contain the string.
+	msg := ctx.reportToEmail()
+	assert.Contains(t, msg.Body, `@testapp.appspotmail.com
+
+Bug presence analysis results: the bug reproduces only on the downstream tree.
+
+
+report1
+
+---
+This report is generated by a bot. It may contain errors.`)
+	// No notification must be sent.
+	c.client.pollNotifs(0)
+}
+
 func TestTreeOriginLts(t *testing.T) {
 	c := NewCtx(t)
 	defer c.Close()
@@ -764,9 +804,9 @@ func (ctx *treeTestCtx) bugLink() string {
 	return fmt.Sprintf("/bug?id=%v", ctx.bug.key(ctx.ctx.ctx).StringID())
 }
 
-func (ctx *treeTestCtx) reportToEmail() {
+func (ctx *treeTestCtx) reportToEmail() *aemail.Message {
 	ctx.client.updateBug(ctx.bugReport.ID, dashapi.BugStatusUpstream, "")
-	ctx.ctx.pollEmailBug() // skip the report
+	return ctx.ctx.pollEmailBug()
 }
 
 var urlRe = regexp.MustCompile(`(https?://[\w\./\?\=&]+)`)

dashboard/dashapi/dashapi.go

@@ -439,6 +439,7 @@ type BugReport struct {
 	Assets         []Asset
 	Subsystems     []BugSubsystem
 	ReportElements *ReportElements
+	LabelMessages  map[string]string // notification messages for bug labels
 }
 
 type ReportElements struct {
@@ -530,7 +531,7 @@ type BugUpdate struct {
 	Link            string
 	Status          BugStatus
 	StatusReason    BugStatusReason
-	Label           string // the reported label, if BugNotifLabel
+	Labels          []string // the reported labels
 	ReproLevel      ReproLevel
 	DupOf           string
 	OnHold          bool     // If set for open bugs, don't upstream this bug.