From d632071317cd1b92f46657b5d37d5d0f2f7b34be Mon Sep 17 00:00:00 2001
From: jochen <jschoubben@gmail.com>
Date: Tue, 3 Nov 2026 23:09:59 +0100
Subject: [PATCH] =?UTF-8?q?nats=20provides=20bus-state,=20so=20a=20module?=
 =?UTF-8?q?=20that=20keeps=20bus=20state=20has=20a=20provider=20to=20wait?=
 =?UTF-8?q?=20for=20(ADR=200614=20=C2=A75,=20issue=20774)?=
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Claude-Session: https://claude.ai/code/session_01JG73KG7AfSdh6FP8VrBqCn
---
 modules/nats/cmd/nats-tools/manifest_test.go | 17 +++++++++++++++++
 modules/nats/module.json                     |  7 +++++++
 2 files changed, 24 insertions(+)

diff --git a/modules/nats/cmd/nats-tools/manifest_test.go b/modules/nats/cmd/nats-tools/manifest_test.go
index 57b4a3fc..93e0a8b3 100644
--- a/modules/nats/cmd/nats-tools/manifest_test.go
+++ b/modules/nats/cmd/nats-tools/manifest_test.go
@@ -32,6 +32,13 @@ func TestTheBussManifestMountsItsProgramsIntoTheUpstreamImage(t *testing.T) {
 				} `json:"backup"`
 			} `json:"own"`
 		} `json:"data"`
+		Provides []struct {
+			Name       string `json:"name"`
+			Scope      string `json:"scope"`
+			Credential struct {
+				Form string `json:"form"`
+			} `json:"credential"`
+		} `json:"provides"`
 		Tools     []string         `json:"tools"`
 		Emits     []string         `json:"emits"`
 		Resources []map[string]any `json:"resources"`
@@ -43,6 +50,16 @@ func TestTheBussManifestMountsItsProgramsIntoTheUpstreamImage(t *testing.T) {
 	if err := json.Unmarshal(raw, &m); err != nil {
 		t.Fatal(err)
 	}
+	// The bus provides "bus-state" beside "mesh-bus" (ADR 0614 §5): a module whose manifest keeps bus state requires it.
+	provided := map[string]string{}
+	for _, p := range m.Provides {
+		provided[p.Name] = p.Scope + "/" + p.Credential.Form
+	}
+	for _, name := range []string{"mesh-bus", "bus-state"} {
+		if provided[name] != "mesh/none" {
+			t.Errorf("provision %q is %q: the bus provides it mesh-wide with no credential", name, provided[name])
+		}
+	}
 	if m.Build.On != nil {
 		t.Error("build.on is declared: nothing is built on a base image any more")
 	}
diff --git a/modules/nats/module.json b/modules/nats/module.json
index 93f518d7..3e58475c 100644
--- a/modules/nats/module.json
+++ b/modules/nats/module.json
@@ -12,6 +12,13 @@
       "credential": {
         "form": "none"
       }
+    },
+    {
+      "name": "bus-state",
+      "scope": "mesh",
+      "credential": {
+        "form": "none"
+      }
     }
   ],
   "claims": [