Read what a node was sent from its assignment keys; a pulled-in module keeps a standing key; a hand send is a time (issue 1109)

SentBuilds answers from the keys of the node's assignments that name a commit, known when the node was sent anything and no key says its commit unknown. A send that names its builds writes the commit, build and rollout on each carried module's key (a module nothing assigns gets a standing key marked pulled-in, never a state) and clears what every other key of the node named; a send by hand writes sent-unknown, a time, on every key and clears their commits. A failed write of these fails the record of the send. node.sent_builds is no longer written. The plan pass ends a pulled-in key only when no send carries it.

cmd/mesh-controller/chain_integration_test.go

@@ -176,12 +176,12 @@ func TestASendOfWhatAMachineRunsAlreadyChangesNoLinkOfItsAssignment(t *testing.T
 	if a, _ := assignmentOf(on, "notes"); a.Rollout != "plan-1" || a.Build != "build-1" || a.Commit != "c1" {
 		t.Fatalf("the assignment names %+v", on)
 	}
-	// A declaration sent by hand with no builds known says nothing of them.
+	// A declaration sent by hand with no builds known makes what the machine runs unknown: a time on the key, no commit.
 	if err := inv.RecordSent(ctx, node, "d3", nil); err != nil {
 		t.Fatal(err)
 	}
-	if on, _ = inv.AssignmentsOn(ctx, "anchor"); runOf(on, "notes").Commit != "c1" {
-		t.Fatalf("a send of unknown builds changed %+v", on)
+	if on, _ = inv.AssignmentsOn(ctx, "anchor"); runOf(on, "notes").Commit != "" || runOf(on, "notes").SentUnknown.IsZero() {
+		t.Fatalf("a send of unknown builds left %+v", on)
 	}
 	// A module sent a commit no build is kept of is named by its commit alone.
 	if err := inv.RecordSent(ctx, node, "d4", map[string]string{"notes": "c2"}); err != nil {