use existing get_grub_device instead of new get_grub_devices

newer versions of leapp deprecated get_grub_device and use
get_grub_devices instead which support raid, etc

our version does not support multiple grub devices,
so use legacy functions instead

repos/system_upgrade/el7toel8/actors/checklegacygrub/libraries/check_legacy_grub.py

@@ -28,7 +28,13 @@ def has_legacy_grub(device):
 
 def check_grub_disks_for_legacy_grub():
     # Both GRUB2 and Grub Legacy are recognized by `get_grub_devices`
-    grub_devices = grub_lib.get_grub_devices()
+    # oshyshatskyi: newer versions of leapp support multiple grub devices e.g. for raid
+    # because our version does not support that, we always check only one device
+    # https://github.com/oamg/leapp-repository/commit/2ba44076625e35aabfd2a1f9e45b2934f99f1e8d
+    grub_device = grub_lib.get_grub_device()
+    grub_devices = []
+    if grub_device:
+        grub_devices.append(grub_device)
 
     legacy_grub_devices = []
     for device in grub_devices:

repos/system_upgrade/el7toel8/actors/scangrubdevpartitionlayout/actor.py

@@ -10,7 +10,7 @@ class ScanGRUBDevicePartitionLayout(Actor):
     """
 
     name = 'scan_grub_device_partition_layout'
-    consumes = (GrubInfo,)
+    consumes = ()
     produces = (GRUBDevicePartitionLayout,)
     tags = (FactsPhaseTag, IPUWorkflowTag,)
 

repos/system_upgrade/el7toel8/actors/scangrubdevpartitionlayout/libraries/scan_layout.py

@@ -1,5 +1,6 @@
 from leapp.libraries.stdlib import api, CalledProcessError, run
-from leapp.models import GRUBDevicePartitionLayout, GrubInfo, PartitionInfo
+from leapp.models import GRUBDevicePartitionLayout, PartitionInfo
+from leapp.libraries.common import grub
 
 SAFE_OFFSET_BYTES = 1024*1024  # 1MiB
 
@@ -82,11 +83,20 @@ def get_partition_layout(device):
 
 
 def scan_grub_device_partition_layout():
-    grub_devices = next(api.consume(GrubInfo), None)
-    if not grub_devices:
+    # oshyshatskyi: newer versions of leapp support multiple grub devices e.g. for raid
+    # because our version does not support that, we always check only one device
+    # https://github.com/oamg/leapp-repository/commit/2ba44076625e35aabfd2a1f9e45b2934f99f1e8d
+    grub_device = grub.get_grub_device()
+    if not grub_device:
         return
-
-    for device in grub_devices.orig_devices:
+    grub_devices = [grub_device]
+
+    # oshyshatskyi: originally rhel used actor to collect information
+    # but we are too out of date to cherry-pick it
+    # anyway, actor did the same thing:
+    #   devices = grub.get_grub_devices()
+    #   grub_info = GrubInfo(orig_devices=devices)
+    for device in grub_devices:
         dev_info = get_partition_layout(device)
         if dev_info:
             api.produce(dev_info)