issue 1841/S14: declare the fallback kernel and its headers after the boot-entries unit

ADR 0508 §9: every DKMS module is built for the fallback kernel too, and its entry is in place first.

modules/kernel/cmd/kernel-tools/bootentries_test.go

@@ -236,3 +236,22 @@ func TestTheBootEntriesUnitAndHookAreTheModules(t *testing.T) {
 		t.Fatalf("apply: %v", apply)
 	}
 }
+
+// The fallback kernel and its headers are declared after the boot-entries service, so the entry is placed
+// before the kernel is installed and every DKMS module is built for it (ADR 0508 §9).
+func TestTheFallbackKernelAndItsHeadersAreDeclaredAfterTheBootEntriesUnit(t *testing.T) {
+	m := manifest(t)
+	at := map[string]int{}
+	for i, r := range m.Resources {
+		at[r["id"].(string)] = i
+	}
+	for id, pkg := range map[string]string{"linux-lts": "linux-lts", "linux-lts-headers": "linux-lts-headers"} {
+		r := m.resource(t, id)
+		if r["type"] != "package" || r["package"] != pkg || r["absent"] == true {
+			t.Errorf("%s: %v", id, r)
+		}
+		if at[id] < at["boot-apply"] || at[id] < at["boot-hook"] {
+			t.Errorf("%s is declared before the boot-entries unit and hook", id)
+		}
+	}
+}

modules/kernel/cmd/kernel-tools/manifest_test.go

@@ -24,7 +24,7 @@ func TestTheDefaultIsMadviseAndTheUnitFollowsTheSetting(t *testing.T) {
 	for _, r := range m.Resources {
 		ids = append(ids, r["id"].(string))
 	}
-	if strings.Join(ids, " ") != "state huge-pages unit apply boot-entries boot-unit boot-hook boot-apply" {
+	if strings.Join(ids, " ") != "state huge-pages unit apply boot-entries boot-unit boot-hook boot-apply linux-lts linux-lts-headers" {
 		t.Fatalf("order: %v", ids)
 	}
 	script := m.resource(t, "huge-pages")

modules/kernel/module.json

@@ -89,6 +89,16 @@
       "health": {
         "kind": "unit"
       }
+    },
+    {
+      "id": "linux-lts",
+      "type": "package",
+      "package": "linux-lts"
+    },
+    {
+      "id": "linux-lts-headers",
+      "type": "package",
+      "package": "linux-lts-headers"
     }
   ],
   "build": {