internal/relui: print out CLs awaiting submission

Change-Id: I94aeb369abc00a128d4bf7db5a7e41291e216cca
Reviewed-on: https://go-review.googlesource.com/c/build/+/820470
Reviewed-by: Neal Patel <nealpatel@google.com>
Reviewed-by: Nicholas Husin <husin@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

internal/relui/workflows.go

diff --git a/internal/relui/workflows.go b/internal/relui/workflows.go
index 253ede6..62a7beb 100644
--- a/internal/relui/workflows.go
+++ b/internal/relui/workflows.go
@@ -1310,6 +1310,7 @@
 func (b *BuildReleaseTasks) submitPrivateChanges(ctx *wf.TaskContext, cls []*gerrit.ChangeInfo) ([]*gerrit.ChangeInfo, error) {
 	if _, err := task.AwaitCondition(ctx, time.Second*10, func() (string, bool, error) {
 		unsubmitted := len(cls)
+		var blocking []string
 		for i, change := range cls {
 			if change.Status == gerrit.ChangeStatusMerged {
 				unsubmitted--
@@ -1320,6 +1321,7 @@
 				return "", false, err
 			}
 			if !ci.Submittable {
+				blocking = append(blocking, privateChangeURL(ci.ChangeNumber))
 				continue
 			}
 			submitted, err := b.PrivateGerritClient.SubmitChange(ctx, ci.ID)
@@ -1332,6 +1334,7 @@
 		if unsubmitted == 0 {
 			return "", true, nil
 		}
+		ctx.Printf("awaiting non-submittable CL(s): %s", strings.Join(blocking, ", "))
 		return "", false, nil
 	}); err != nil {
 		return nil, err
@@ -1425,6 +1428,7 @@
 func (b *BuildReleaseTasks) submitCherryPicks(ctx *wf.TaskContext, cherryPicks []*gerrit.ChangeInfo) (map[string][]string, error) {
 	if _, err := task.AwaitCondition(ctx, time.Second*10, func() (string, bool, error) {
 		unsubmitted := len(cherryPicks)
+		var blocking []string
 		for i, cp := range cherryPicks {
 			if cp.Status == gerrit.ChangeStatusMerged {
 				unsubmitted--
@@ -1435,6 +1439,7 @@
 				return "", false, err
 			}
 			if !ci.Submittable {
+				blocking = append(blocking, privateChangeURL(ci.ChangeNumber))
 				continue
 			}
 			submitted, err := b.PrivateGerritClient.SubmitChange(ctx, ci.ID)
@@ -1447,6 +1452,7 @@
 		if unsubmitted == 0 {
 			return "", true, nil
 		}
+		ctx.Printf("awaiting non-submittable CL(s): %s", strings.Join(blocking, ", "))
 		return "", false, nil
 	}); err != nil {
 		return nil, err