system/dbus: remove builder state leak

This enables external testing of system.I state.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/app/app_test.go

@@ -25,6 +25,7 @@ import (
 	"hakurei.app/message"
 	"hakurei.app/system"
 	"hakurei.app/system/acl"
+	"hakurei.app/system/dbus"
 )
 
 func TestApp(t *testing.T) {
@@ -213,7 +214,7 @@ func TestApp(t *testing.T) {
 				Ensure(m("/run/user/1971"), 0700).UpdatePermType(system.User, m("/run/user/1971"), acl.Execute). // this is ordered as is because the previous Ensure only calls mkdir if XDG_RUNTIME_DIR is unset
 				Ephemeral(system.Process, m("/run/user/1971/hakurei/ebf083d1b175911782d413369b64ce7c"), 0700).UpdatePermType(system.Process, m("/run/user/1971/hakurei/ebf083d1b175911782d413369b64ce7c"), acl.Execute).
 				Link(m("/run/user/1971/pulse/native"), m("/run/user/1971/hakurei/ebf083d1b175911782d413369b64ce7c/pulse")).
-				MustProxyDBus(m("/tmp/hakurei.0/ebf083d1b175911782d413369b64ce7c/bus"), &hst.BusConfig{
+				MustProxyDBus(&hst.BusConfig{
 					Talk: []string{
 						"org.freedesktop.Notifications",
 						"org.freedesktop.FileManager1",
@@ -235,13 +236,19 @@ func TestApp(t *testing.T) {
 						"org.freedesktop.portal.*": "@/org/freedesktop/portal/*",
 					},
 					Filter: true,
-				}, m("/tmp/hakurei.0/ebf083d1b175911782d413369b64ce7c/system_bus_socket"), &hst.BusConfig{
+				}, &hst.BusConfig{
 					Talk: []string{
 						"org.bluez",
 						"org.freedesktop.Avahi",
 						"org.freedesktop.UPower",
 					},
 					Filter: true,
+				}, dbus.ProxyPair{
+					"unix:path=/run/user/1971/bus",
+					"/tmp/hakurei.0/ebf083d1b175911782d413369b64ce7c/bus",
+				}, dbus.ProxyPair{
+					"unix:path=/var/run/dbus/system_bus_socket",
+					"/tmp/hakurei.0/ebf083d1b175911782d413369b64ce7c/system_bus_socket",
 				}).
 				UpdatePerm(m("/tmp/hakurei.0/ebf083d1b175911782d413369b64ce7c/bus"), acl.Read, acl.Write).
 				UpdatePerm(m("/tmp/hakurei.0/ebf083d1b175911782d413369b64ce7c/system_bus_socket"), acl.Read, acl.Write),
@@ -364,7 +371,7 @@ func TestApp(t *testing.T) {
 				Ephemeral(system.Process, m("/run/user/1971/hakurei/8e2c76b066dabe574cf073bdb46eb5c1"), 0700).UpdatePermType(system.Process, m("/run/user/1971/hakurei/8e2c76b066dabe574cf073bdb46eb5c1"), acl.Execute).
 				Link(m("/run/user/1971/pulse/native"), m("/run/user/1971/hakurei/8e2c76b066dabe574cf073bdb46eb5c1/pulse")).
 				Ephemeral(system.Process, m("/tmp/hakurei.0/8e2c76b066dabe574cf073bdb46eb5c1"), 0711).
-				MustProxyDBus(m("/tmp/hakurei.0/8e2c76b066dabe574cf073bdb46eb5c1/bus"), &hst.BusConfig{
+				MustProxyDBus(&hst.BusConfig{
 					Talk: []string{
 						"org.freedesktop.FileManager1", "org.freedesktop.Notifications",
 						"org.freedesktop.ScreenSaver", "org.freedesktop.secrets",
@@ -377,13 +384,19 @@ func TestApp(t *testing.T) {
 					},
 					Call: map[string]string{}, Broadcast: map[string]string{},
 					Filter: true,
-				}, m("/tmp/hakurei.0/8e2c76b066dabe574cf073bdb46eb5c1/system_bus_socket"), &hst.BusConfig{
+				}, &hst.BusConfig{
 					Talk: []string{
 						"org.bluez",
 						"org.freedesktop.Avahi",
 						"org.freedesktop.UPower",
 					},
 					Filter: true,
+				}, dbus.ProxyPair{
+					"unix:path=/run/user/1971/bus",
+					"/tmp/hakurei.0/8e2c76b066dabe574cf073bdb46eb5c1/bus",
+				}, dbus.ProxyPair{
+					"unix:path=/var/run/dbus/system_bus_socket",
+					"/tmp/hakurei.0/8e2c76b066dabe574cf073bdb46eb5c1/system_bus_socket",
 				}).
 				UpdatePerm(m("/tmp/hakurei.0/8e2c76b066dabe574cf073bdb46eb5c1/bus"), acl.Read, acl.Write).
 				UpdatePerm(m("/tmp/hakurei.0/8e2c76b066dabe574cf073bdb46eb5c1/system_bus_socket"), acl.Read, acl.Write),
@@ -739,6 +752,10 @@ func (k *stubNixOS) overflowGid(message.Msg) int { return 65534 }
 
 func (k *stubNixOS) mustHsuPath() *check.Absolute { return m("/proc/nonexistent/hsu") }
 
+func (k *stubNixOS) dbusAddress() (string, string) {
+	return "unix:path=/run/user/1971/bus", "unix:path=/var/run/dbus/system_bus_socket"
+}
+
 func (k *stubNixOS) fatalf(format string, v ...any) { panic(fmt.Sprintf(format, v...)) }
 
 func (k *stubNixOS) isVerbose() bool                  { return true }

internal/app/dispatcher.go

@@ -13,6 +13,7 @@ import (
 	"hakurei.app/container/check"
 	"hakurei.app/internal"
 	"hakurei.app/message"
+	"hakurei.app/system/dbus"
 )
 
 // osFile represents [os.File].
@@ -63,6 +64,9 @@ type syscallDispatcher interface {
 	// mustHsuPath provides [internal.MustHsuPath].
 	mustHsuPath() *check.Absolute
 
+	// dbusAddress provides [dbus.Address].
+	dbusAddress() (session, system string)
+
 	// fatalf provides [log.Fatalf].
 	fatalf(format string, v ...any)
 }
@@ -99,4 +103,6 @@ func (direct) overflowGid(msg message.Msg) int { return container.OverflowGid(ms
 
 func (direct) mustHsuPath() *check.Absolute { return internal.MustHsuPath() }
 
+func (k direct) dbusAddress() (session, system string) { return dbus.Address() }
+
 func (direct) fatalf(format string, v ...any) { log.Fatalf(format, v...) }

internal/app/dispatcher_test.go

@@ -97,7 +97,7 @@ func checkOpBehaviour(t *testing.T, testCases []opBehaviourTestCase) {
 				if err := s.populateLocal(k, k); err != nil {
 					t.Fatalf("populateLocal: error = %v", err)
 				}
-				stateSys := s.newSys(config, newI())
+				stateSys := s.newSys(config, system.New(panicMsgContext{}, k, checkExpectUid))
 				if tc.pStateSys != nil {
 					tc.pStateSys(stateSys)
 				}
@@ -218,6 +218,12 @@ func (k *kstub) mustHsuPath() *check.Absolute {
 	return k.Expects("mustHsuPath").Ret.(*check.Absolute)
 }
 
+func (k *kstub) dbusAddress() (session, system string) {
+	k.Helper()
+	ret := k.Expects("dbusAddress").Ret.([2]string)
+	return ret[0], ret[1]
+}
+
 func (k *kstub) GetLogger() *log.Logger { panic("unreachable") }
 
 func (k *kstub) IsVerbose() bool { k.Helper(); return k.Expects("isVerbose").Ret.(bool) }
@@ -320,4 +326,5 @@ func (panicDispatcher) cmdOutput(*exec.Cmd) ([]byte, error)   { panic("unreachab
 func (panicDispatcher) overflowUid(message.Msg) int           { panic("unreachable") }
 func (panicDispatcher) overflowGid(message.Msg) int           { panic("unreachable") }
 func (panicDispatcher) mustHsuPath() *check.Absolute          { panic("unreachable") }
+func (panicDispatcher) dbusAddress() (string, string)         { panic("unreachable") }
 func (panicDispatcher) fatalf(string, ...any)                 { panic("unreachable") }

internal/app/spdbus.go

@@ -13,8 +13,7 @@ func init() { gob.Register(new(spDBusOp)) }
 
 // spDBusOp maintains an xdg-dbus-proxy instance for the container.
 type spDBusOp struct {
-	// Whether to bind the system bus socket.
-	// Populated during toSystem.
+	// Whether to bind the system bus socket. Populated during toSystem.
 	ProxySystem bool
 }
 
@@ -30,10 +29,10 @@ func (s *spDBusOp) toSystem(state *outcomeStateSys) error {
 	// downstream socket paths
 	sessionPath, systemPath := state.instance().Append("bus"), state.instance().Append("system_bus_socket")
 
-	if err := state.sys.ProxyDBus(
-		state.sessionBus, state.systemBus,
-		sessionPath, systemPath,
-	); err != nil {
+	var sessionBus, systemBus dbus.ProxyPair
+	sessionBus[0], systemBus[0] = state.k.dbusAddress()
+	sessionBus[1], systemBus[1] = sessionPath.String(), systemPath.String()
+	if err := state.sys.ProxyDBus(state.sessionBus, state.systemBus, sessionBus, systemBus); err != nil {
 		return err
 	}