A runtime compiled to a binary runs itself (hq ADR 0193)

A compiled bundle records the binary it is (BinaryOf, shared by the builder and the composer), and
the node's runtime, when it is one, is run as ./<binary> from its own unpacked bundle rather than by
an interpreter and an entrypoint.

internal/catalogue/runtime_test.go

@@ -362,3 +362,30 @@ func TestTheRuntimeStartsTheLauncherWhereTheBuildWroteOne(t *testing.T) {
 		t.Errorf("the runtime is told %q, want %q", env[RuntimeToolModules], want)
 	}
 }
+
+// novox/hq ADR 0193: a runtime compiled to a binary runs itself from its own unpacked bundle.
+func TestARuntimeCompiledToABinaryRunsItself(t *testing.T) {
+	with := Rendering{ArtifactStore: "anchor.internal:5101",
+		Needed: map[string]map[string]string{RuntimeModule: {"broker": "sealed-credential"}}}
+	goRuntime := Manifest{Module: RuntimeModule, Version: "1",
+		OwnSecrets: OwnSecrets{"broker": {Path: "/var/lib/mesh/" + RuntimeModule + "/broker"}},
+		Build: &Build{Artifacts: []Artifact{{Name: "runtime", Kind: ArtifactBundle, Language: "go",
+			System: "arch", From: "cmd/node-tools"}}}}
+	goRuntime, err := goRuntime.Resolve([]Built{{Name: "runtime", Kind: ArtifactBundle,
+		Reference: ArtifactStoreScheme + RuntimeModule + "/runtime/blobs/" + bundleDigest, Digest: bundleDigest}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	out, err := Resolution{Node: "anchor", Account: "ops", Modules: []Manifest{aToolsModule(t, "nftables", "tools/index.js"), goRuntime}}.Declaration(with)
+	if err != nil {
+		t.Fatal(err)
+	}
+	process := fileNamed(out, RuntimeModule+"."+RuntimeProcessID())
+	if fmt.Sprint(process["run"]) != "[./node-tools]" {
+		t.Errorf("a Go runtime is run as %v, want its own binary", process["run"])
+	}
+	env := process["env"].(map[string]string)
+	if env[RuntimeToolModules] == "" || process["user"] != "ops" {
+		t.Errorf("the Go runtime is not told what to serve or whose it is: %v %v", env, process["user"])
+	}
+}