Name a retry's modules still waiting for the bus, read as the plan it resumes (issue 1851 A11a, issue 1403)

With the hand rebuild gone, a retry of a plan failed past the bus's bound
read the waiting modules while the plan still said failed, named none,
and answered "asked" with nothing after it.

cmd/mesh-controller/ask_bus_wait_test.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/novox/mesh-controller/internal/inventory"
+)
+
+// A retry of a plan failed past the bus's bound, whose module the bus still does not answer, names that module as waiting:
+// read while the plan still says failed, it was named nowhere, and the retry said "asked" with nothing after it (issue
+// 1403, met again once the hand rebuild no longer resumed the plan first).
+func TestARetryNamesTheModulesStillWaitingForTheBus(t *testing.T) {
+	since := time.Now().UTC()
+	p := inventory.Plan{ID: "plan-bus", State: inventory.PlanFailed, Tiers: [][]string{{"a"}},
+		Modules: map[string]*inventory.PlanModule{"a": {BusWaitFrom: &since}}}
+	waiting := busWaitingOnRetry(p)
+	_, said := retryWords(p, []string{"a"}, nil, waiting)
+	if !strings.Contains(said, "a not asked yet: the bus did not answer") || strings.Contains(said, "asked ;") {
+		t.Fatalf("a retry left for the bus is said as %q", said)
+	}
+}

cmd/mesh-controller/plan_retry.go

@@ -408,7 +408,7 @@ func retryPlan(ctx context.Context, open *stores, id string) (string, error) {
 			asked = append(asked, m+" as "+s.Build)
 		}
 	}
-	waiting := busWaitingIn(p)
+	waiting := busWaitingOnRetry(p)
 	note, said := retryWords(p, failed, asked, waiting)
 	resumed(&p, note)
 	if err := inv.SavePlan(ctx, &p); err != nil {
@@ -420,6 +420,14 @@ func retryPlan(ctx context.Context, open *stores, id string) (string, error) {
 	return said, nil
 }
 
+// busWaitingOnRetry are the modules a retry left waiting for the bus. Read before the plan is resumed, while it still says
+// failed, so read as the plan the retry resumes: a failed plan is not open, and busWaitingIn would name none, leaving the
+// answer "asked" with nothing after it (issue 1403).
+func busWaitingOnRetry(p inventory.Plan) []string {
+	p.State = inventory.PlanBuilding
+	return busWaitingIn(p)
+}
+
 // retryWords are the plan's note and the verb's answer for a retry: what was asked again (as the builds it got), and what waits
 // for the bus. A retry whose modules all wait for the bus asked none, and says so rather than "asked" with nothing after it
 // (issue 1403).