linstor: add fixture to get LVM disk paths

This extracts the `host_devices` function of the `lvm_disks` fixture in
the LINSTOR SR tests into its own fixture. This allows getting the paths
to the physical disks used in the LVM volume in other fixtures and the
tests, and overriding those paths in sub-packages.

Signed-off-by: Alexandre Sollier <alexandre.sollier@vates.tech>

Author: Kuruyia

tests/storage/linstor/conftest.py

@@ -48,10 +48,16 @@ class LinstorConfig:
 def _linstor_config() -> LinstorConfig:
     return LinstorConfig()
 
+@pytest.fixture(scope='package')
+def lvm_disk_paths(
+    unused_512B_disks: dict[Host, list[Host.BlockDeviceInfo]],
+) -> dict[Host, list[str]]:
+    return {host: [disk.path for disk in disks[0:1]] for (host, disks) in unused_512B_disks.items()}
+
 @pytest.fixture(scope='package')
 def lvm_disks(
     pool_with_unused_512B_disk: Pool,
-    unused_512B_disks: dict[Host, list[Host.BlockDeviceInfo]],
+    lvm_disk_paths: dict[Host, list[str]],
     provisioning_type: str,
 ) -> Generator[None, None, None]:
     """
@@ -66,12 +72,8 @@ def lvm_disks(
     """
     hosts = pool_with_unused_512B_disk.hosts
 
-    @functools.cache
-    def host_devices(host: Host) -> list[str]:
-        return [disk.path for disk in unused_512B_disks[host][0:1]]
-
     for host in hosts:
-        devices = host_devices(host)
+        devices = lvm_disk_paths[host]
         for device in devices:
             try:
                 host.ssh(f'pvcreate -ff -y {device}')
@@ -94,7 +96,7 @@ def host_devices(host: Host) -> list[str]:
 
     for host in hosts:
         host.ssh(f'vgremove -f {GROUP_NAME}')
-        for device in host_devices(host):
+        for device in lvm_disk_paths[host]:
             host.ssh(f'pvremove {device}')
 
 @pytest.fixture(scope="package")