feat: Fix D-Bus type compatibility and establish successful daemon communication

- Fix D-Bus type errors by flattening status dictionary
- Remove nested 'config' dictionary that caused TypeError
- Convert all values to D-Bus-compatible types (string, int, bool, double)
- Confirm production security policy working (root-only access)
- Successfully test GetStatus method with valid response
- Update D-Bus policy to allow root access to specific interfaces
- Update CHANGELOG.md with D-Bus communication milestone
- Update TODO.md to reflect completed daemon integration

The apt-ostree daemon now has working D-Bus communication with proper
type handling and production-ready security policies. Ready for full
integration with apt-layer.sh client.

TODO.md

@@ -35,8 +35,13 @@
 
 ### VM Testing & Daemon Integration
 - ✅ VM environment setup and apt-layer/apt-ostree integration testing
-- 🔄 Diagnosing daemon startup issue: Python entry point not launching daemon as expected
-- 🔄 Next: Verify Python package install, test running daemon directly, fix entry point/install process
+- ✅ Daemon startup and D-Bus registration working correctly
+- ✅ D-Bus communication established with proper method signatures
+- ✅ D-Bus type compatibility resolved (flattened status dictionary)
+- ✅ Production security policy confirmed (root-only access)
+- ✅ GetStatus method tested and returning valid responses
+- 🎯 Next: Implement additional D-Bus methods (InstallPackages, RemovePackages, etc.)
+- 🎯 Next: Integrate with apt-layer.sh client for full daemon orchestration
 
 ## Next Phase 🎯
 

src/apt-layer/CHANGELOG.md

@@ -7,6 +7,37 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### [2025-07-16 UTC] - DAEMON INTEGRATION: D-BUS COMMUNICATION SUCCESSFUL
+- **Major Milestone**: Successfully established D-Bus communication with apt-ostree daemon.
+- **D-Bus Method Testing**: Successfully tested `GetStatus` method with proper D-Bus type handling:
+  - Method call: `org.debian.aptostree1.Sysroot.GetStatus`
+  - Object path: `/org/debian/aptostree1/Sysroot`
+  - Interface: `org.debian.aptostree1.Sysroot`
+  - Valid response with daemon status information
+- **D-Bus Type Compatibility**: Fixed D-Bus type errors by flattening status dictionary:
+  - Removed nested `config` dictionary that caused `TypeError`
+  - Converted all values to D-Bus-compatible types (string, int, bool, double)
+  - Ensured all returned values are simple, serializable types
+- **Production Security**: Confirmed root-only D-Bus policy is working correctly:
+  - Non-root users receive `AccessDenied` (expected)
+  - Root users can successfully call D-Bus methods
+  - Policy file properly installed and D-Bus reloaded
+- **Daemon Status Response**: Confirmed daemon returns comprehensive status:
+  - `running`: boolean true (daemon is active)
+  - `clients`: int32 0 (no active clients)
+  - `active_transactions`: int32 0 (no active transactions)
+  - `sysroot_path`: string "/" (system root path)
+  - `uptime`: double (daemon uptime in seconds)
+  - `idle_exit_timeout`: int32 60 (idle timeout configuration)
+  - `auto_update_policy`: string "none" (update policy setting)
+- **Integration Readiness**: Daemon is now ready for full integration:
+  - ✅ D-Bus communication working
+  - ✅ Security policy enforced
+  - ✅ Method signatures correct
+  - ✅ Type compatibility resolved
+  - ✅ Status reporting functional
+- **Next Steps**: Ready to implement additional D-Bus methods and integrate with apt-layer.sh client.
+
 ### [2025-07-16 UTC] - PRODUCTION SECURITY: D-BUS POLICY HARDENING
 - **Production Security Enhancement**: Updated D-Bus policy for production use with root-only access.
 - **D-Bus Policy Hardening**: Modified `src/apt-ostree.py/dbus-policy/org.debian.aptostree1.conf`:

src/apt-ostree.py/dbus-policy/org.debian.aptostree1.conf

@@ -6,6 +6,8 @@
   <!-- Allow root user to own the apt-ostree service -->
   <policy user="root">
     <allow own="org.debian.aptostree1"/>
+    <allow send_destination="org.debian.aptostree1"/>
+    <allow receive_sender="org.debian.aptostree1"/>
   </policy>
 
   <!-- Production policy: Only root can communicate with apt-ostree service -->

src/apt-ostree.py/python/core/daemon.py

@@ -331,10 +331,8 @@ class AptOstreeDaemon(GObject.Object):
             'running': self.running,
             'clients': len(self.client_manager.clients),
             'active_transactions': len(self.active_transactions),
-            'sysroot_path': self.sysroot.path if self.sysroot else None,
-            'uptime': time.time() - getattr(self, '_start_time', time.time()),
-            'config': {
-                'idle_exit_timeout': self.idle_exit_timeout,
-                'auto_update_policy': self.auto_update_policy
-            }
+            'sysroot_path': str(self.sysroot.path) if self.sysroot else "",
+            'uptime': float(time.time() - getattr(self, '_start_time', time.time())),
+            'idle_exit_timeout': int(self.idle_exit_timeout),
+            'auto_update_policy': str(self.auto_update_policy)
         }