Support storage driver defaults (file/lvm/lvmthin)

Author: msinhore

host-agent/api/handlers.py

@@ -682,6 +682,33 @@ def _norm(value: Any, default: str = "") -> str:
         net = NetSpec(driver=net_driver, bridge=net_bridge, nics=nics, host_bridge=net_host_bridge, uplink=net_uplink)
         return Spec(vm=vm, host=host, vmext=vmext, storage=storage, net=net)
 
+    def _build_storage_spec(self, vm: "VMDetails", payload: Dict[str, Any]) -> "StorageSpec":
+        storage_defaults = self.agent_defaults.get("storage", {}) if isinstance(self.agent_defaults, dict) else {}
+        driver = (storage_defaults.get("driver") or "file").lower()
+        volume_dir = storage_defaults.get("volume_dir", "/var/lib/firecracker/volumes")
+        size = storage_defaults.get("size")
+
+        spec = StorageSpec(driver=driver, volume_file=str(Path(volume_dir) / f"{vm.name}.img"), size=size)
+
+        if driver == "lvm":
+            vg = storage_defaults.get("volume_group") or storage_defaults.get("vg")
+            if not vg:
+                raise HTTPException(status_code=500, detail="storage.volume_group required for lvm")
+            spec.vg = vg
+            return spec
+
+        if driver == "lvmthin":
+            vg = storage_defaults.get("volume_group") or storage_defaults.get("vg")
+            pool = storage_defaults.get("thinpool")
+            if not vg or not pool:
+                raise HTTPException(status_code=500, detail="storage.volume_group and storage.thinpool required for lvmthin")
+            spec.vg = vg
+            spec.thinpool = pool
+            return spec
+
+        spec.driver = "file"
+        return spec
+
     def _cfg_to_spec(self, cfg: Dict[str, Any], vm_name: str) -> Spec:
         """Convert configuration to Spec object."""
         from models import HostDetails, NetSpec, NIC, StorageSpec, VMDetails, VMExt

host-agent/models.py

@@ -60,6 +60,9 @@ class StorageSpec:
 
     driver: str
     volume_file: str
+    vg: Optional[str] = None
+    thinpool: Optional[str] = None
+    size: Optional[int] = None
 
 
 @dataclasses.dataclass