Fix for using the correct volume name to mount filesystems in Unix

dissect/target/plugins/os/unix/_os.py

@@ -202,8 +202,9 @@ def _add_mounts(self) -> None:
                 fs_id = None
                 fs_subvol = None
                 fs_subvolid = None
-                fs_volume_name = fs.volume.name if fs.volume and not isinstance(fs.volume, list) else None
                 fs_last_mount = None
+                fs_volume_name = None
+                vol_volume_name = fs.volume.name if fs.volume and not isinstance(fs.volume, list) else None
 
                 if fs.__type__ == "xfs":
                     fs_id = fs.xfs.uuid
@@ -224,8 +225,9 @@ def _add_mounts(self) -> None:
 
                 if (
                     (fs_id and (fs_id == dev_id and (subvol == fs_subvol or subvolid == fs_subvolid)))
-                    or (fs_volume_name and (fs_volume_name == volume_name))
                     or (fs_last_mount and (fs_last_mount == mount_point))
+                    or (fs_volume_name and (fs_volume_name == volume_name))
+                    or (vol_volume_name and (vol_volume_name == volume_name))
                 ):
                     self.target.log.debug("Mounting %s (%s) at %s", fs, fs.volume, mount_point)
                     self.target.fs.mount(mount_point, fs)

tests/plugins/os/unix/test__os.py

@@ -1,12 +1,13 @@
 import tempfile
 from io import BytesIO
 from pathlib import Path
+from unittest.mock import Mock, patch
 from uuid import UUID
 
 import pytest
 
 from dissect.target.filesystem import VirtualFilesystem
-from dissect.target.plugins.os.unix._os import parse_fstab
+from dissect.target.plugins.os.unix._os import UnixPlugin, parse_fstab
 from dissect.target.target import Target
 
 FSTAB_CONTENT = """
@@ -44,7 +45,7 @@
 """  # noqa
 
 
-def test_parse_fstab(tmp_path):
+def test_parse_fstab(tmp_path: Path) -> None:
     with tempfile.NamedTemporaryFile(dir=tmp_path, delete=False) as tf:
         tf.write(FSTAB_CONTENT.encode("ascii"))
         tf.close()
@@ -71,6 +72,29 @@ def test_parse_fstab(tmp_path):
     }
 
 
+def test_mount_volume_name_regression(fs_unix: VirtualFilesystem) -> None:
+    mock_fs = Mock()
+    mock_vol = Mock()
+
+    mock_vol.name = "test-volume"
+
+    mock_fs.__type__ = "ext"
+    mock_fs.extfs.volume_name = "ext-volume"
+    mock_fs.volume = mock_vol
+    mock_fs.exists.return_value = False
+
+    for expected_volume_name in ["test-volume", "ext-volume"]:
+        with patch(
+            "dissect.target.plugins.os.unix._os.parse_fstab",
+            return_value=[(None, expected_volume_name, "/mnt", "auto", "default")],
+        ):
+            target = Target()
+            target.filesystems.add(mock_fs)
+            UnixPlugin.create(target, fs_unix)
+
+            assert target.fs.mounts["/mnt"] == mock_fs
+
+
 @pytest.mark.parametrize(
     "path, expected_hostname, expected_domain, file_content",
     [