Update LVM volume system to reflect library update (#371)

dissect/target/volumes/lvm.py

@@ -1,10 +1,25 @@
+import logging
 from collections import defaultdict
 from typing import BinaryIO, Iterator, Union
 
 from dissect.volume import lvm
 
 from dissect.target.volume import LogicalVolumeSystem, Volume
 
+log = logging.getLogger(__name__)
+
+OPEN_TYPES = (
+    "linear",
+    "striped",
+    "mirror",
+    "thin",
+)
+
+KNOWN_SKIP_TYPES = (
+    "snapshot",
+    "thin-pool",
+)
+
 
 class LvmVolumeSystem(LogicalVolumeSystem):
     def __init__(self, fh: Union[BinaryIO, list[BinaryIO]], *args, **kwargs):
@@ -19,13 +34,10 @@ def open_all(cls, volumes: list[BinaryIO]) -> Iterator[LogicalVolumeSystem]:
             if not cls.detect_volume(vol):
                 continue
 
-            pv = lvm.PhysicalVolume(vol)
-            if pv.has_metadata():
-                try:
-                    m = pv.read_metadata()
-                except Exception:
-                    continue
-                lvm_pvs[m.vg.name].append(pv)
+            dev = lvm.LVM2Device(vol)
+            if metadata := dev.metadata:
+                vg_name = next(key for key, value in metadata.items() if isinstance(value, dict))
+                lvm_pvs[vg_name].append(dev)
 
         for pvs in lvm_pvs.values():
             try:
@@ -47,8 +59,19 @@ def _detect_volume(fh: BinaryIO) -> bool:
         return b"LABELONE" in buf
 
     def _volumes(self) -> Iterator[Volume]:
-        for num, lv in enumerate(self.lvm.volume_group.logical_volumes):
+        num = 1
+
+        for lv_name, lv in self.lvm.volume_group.logical_volumes.items():
+            if lv.type not in OPEN_TYPES:
+                if lv.type not in KNOWN_SKIP_TYPES:
+                    log.debug("Skipping unsupported LVM logical volume type: %s (%s)", lv.type, lv)
+                continue
+
             # When composing a vg-lv name, LVM2 replaces hyphens with double hyphens in the vg and lv names
             # Emulate that here for the volume name
-            name = f"{lv.vg.name.replace('-', '--')}-{lv.metadata.name.replace('-', '--')}"
-            yield Volume(lv, num + 1, None, lv.size, None, name, raw=lv, vs=self)
+            name = f"{lv.vg.name.replace('-', '--')}-{lv_name.replace('-', '--')}"
+
+            fh = lv.open()
+            yield Volume(fh, num, None, fh.size, None, name, raw=lv, vs=self)
+
+            num += 1