dashboard: amend configs during tree origin testing

There are cases when e.g. an LTS kernel does not build if provided with
some downstream kernel config.

Introduce a special AppendConfig option to KernelRepo that can help in
this case.

4 files changed, 70 insertions, 1 deletions

diff --git a/dashboard/app/config.go b/dashboard/app/config.go
index 7c968ff0c..79304af77 100644
--- a/dashboard/app/config.go
+++ b/dashboard/app/config.go
@@ -254,6 +254,8 @@ type KernelRepo struct {
 	CommitInflow []KernelRepoLink
 	// Enable the missing backport tracking feature for this tree.
 	DetectMissingBackports bool
+	// Append this string to the config file before running reproducers on this tree.
+	AppendConfig string
 }
 
 type KernelRepoLink struct {
diff --git a/dashboard/app/jobs.go b/dashboard/app/jobs.go
index b0d9a5e68..6c2abfcb0 100644
--- a/dashboard/app/jobs.go
+++ b/dashboard/app/jobs.go
@@ -89,6 +89,7 @@ type testJobArgs struct {
 	crash         *Crash
 	crashKey      *db.Key
 	configRef     int64
+	configAppend  string
 	treeOrigin    bool
 	inTransaction bool
 	testReqArgs
@@ -109,6 +110,18 @@ func addTestJob(c context.Context, args *testJobArgs) (*Job, *db.Key, error) {
 	if err != nil {
 		return nil, nil, err
 	}
+	configRef := args.configRef
+	if args.configAppend != "" {
+		kernelConfig, _, err := getText(c, textKernelConfig, configRef)
+		if err != nil {
+			return nil, nil, err
+		}
+		configRef, err = putText(c, args.bug.Namespace, textKernelConfig,
+			append(kernelConfig, []byte(args.configAppend)...), true)
+		if err != nil {
+			return nil, nil, err
+		}
+	}
 	reportingName := ""
 	if args.bugReporting != nil {
 		reportingName = args.bugReporting.Name
@@ -130,7 +143,7 @@ func addTestJob(c context.Context, args *testJobArgs) (*Job, *db.Key, error) {
 		MergeBaseRepo:   args.mergeBaseRepo,
 		MergeBaseBranch: args.mergeBaseBranch,
 		Patch:           patchID,
-		KernelConfig:    args.configRef,
+		KernelConfig:    configRef,
 		TreeOrigin:      args.treeOrigin,
 	}
 
diff --git a/dashboard/app/tree.go b/dashboard/app/tree.go
index e6ee6cc26..6e1b1e9d0 100644
--- a/dashboard/app/tree.go
+++ b/dashboard/app/tree.go
@@ -431,6 +431,7 @@ func (ctx *bugTreeContext) doRunRepro(repo KernelRepo, result expectedResult, ru
 		crash:         ctx.crash,
 		crashKey:      ctx.crashKey,
 		configRef:     ctx.build.KernelConfig,
+		configAppend:  repo.AppendConfig,
 		inTransaction: true,
 		treeOrigin:    true,
 		testReqArgs: testReqArgs{
diff --git a/dashboard/app/tree_test.go b/dashboard/app/tree_test.go
index 8ffcfdc07..30637c91b 100644
--- a/dashboard/app/tree_test.go
+++ b/dashboard/app/tree_test.go
@@ -633,6 +633,55 @@ var downstreamUpstreamBackports = []KernelRepo{
 	},
 }
 
+func TestTreeConfigAppend(t *testing.T) {
+	c := NewCtx(t)
+	defer c.Close()
+
+	ctx := setUpTreeTest(c, []KernelRepo{
+		{
+			URL:    `https://downstream.repo/repo`,
+			Branch: `master`,
+			Alias:  `downstream`,
+			CommitInflow: []KernelRepoLink{
+				{
+					Alias: `lts`,
+					Merge: true,
+				},
+			},
+			LabelIntroduced: `downstream`,
+		},
+		{
+			URL:             `https://lts.repo/repo`,
+			Branch:          `lts-master`,
+			Alias:           `lts`,
+			LabelIntroduced: `lts`,
+			AppendConfig:    "\nCONFIG_TEST=y",
+		},
+	})
+	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: treeTestCrash}},
+		},
+	}
+	ctx.jobTestDays = []int{10}
+	tested := false
+	ctx.validateJob = func(resp *dashapi.JobPollResp) {
+		if resp.KernelBranch == "lts-master" {
+			tested = true
+			assert.Contains(t, string(resp.KernelConfig), "\nCONFIG_TEST=y")
+		}
+	}
+	ctx.moveToDay(10)
+	assert.True(t, tested)
+}
+
 func setUpTreeTest(ctx *Ctx, repos []KernelRepo) *treeTestCtx {
 	ret := &treeTestCtx{
 		ctx:     ctx,
@@ -653,6 +702,7 @@ type treeTestCtx struct {
 	perAlias    map[string]KernelRepo
 	jobTestDays []int
 	manager     string
+	validateJob func(*dashapi.JobPollResp)
 }
 
 func (ctx *treeTestCtx) now() time.Time {
@@ -728,6 +778,9 @@ func (ctx *treeTestCtx) moveToDay(tillDay int) {
 			if pollResp.ID == "" {
 				break
 			}
+			if ctx.validateJob != nil {
+				ctx.validateJob(pollResp)
+			}
 			ctx.ctx.advanceTime(time.Minute)
 			ctx.doJob(pollResp, seqDay)
 		}