Move logic to calculate raid sectors to raid_utils

Some more raid related logic moved to raid_utils.

Change-Id: I08c73ad14e5b01ebac2490b83997c5452506d4a2

ironic_python_agent/hardware.py

@@ -1670,23 +1670,9 @@ class GenericHardwareManager(HardwareManager):
             disk_names = logical_disk['block_devices']
             for device in disk_names:
                 start = parted_start_dict[device]
-
+                start_str, end_str, end = (
-                if isinstance(start, int):
+                    raid_utils.calc_raid_partition_sectors(psize, start)
-                    start_str = '%dGiB' % start
+                )
-                else:
-                    start_str = start
-
-                if psize == -1:
-                    end_str = '-1'
-                    end = '-1'
-                else:
-                    if isinstance(start, int):
-                        end = start + psize
-                    else:
-                        # First partition case, start is sth like 2048s
-                        end = psize
-                    end_str = '%dGiB' % end
-
                 try:
                     LOG.debug("Creating partition on {}: {} {}".format(
                         device, start_str, end_str))

ironic_python_agent/raid_utils.py

@@ -103,3 +103,32 @@ def calculate_raid_start(target_boot_mode, partition_table_type, dev_name):
             raid_start = "{}s".format(out.splitlines()[-1])
 
     return raid_start
+
+
+def calc_raid_partition_sectors(psize, start):
+    """Calculates end sector and converts start and end sectors including
+
+    the unit of measure, compatible with parted.
+    :param psize: size of the raid partition
+    :param start: start sector of the raid partion in integer format
+    :return: start and end sector in parted compatible format, end sector
+        as integer
+    """
+
+    if isinstance(start, int):
+        start_str = '%dGiB' % start
+    else:
+        start_str = start
+
+    if psize == -1:
+        end_str = '-1'
+        end = '-1'
+    else:
+        if isinstance(start, int):
+            end = start + psize
+        else:
+            # First partition case, start is sth like 2048s
+            end = psize
+        end_str = '%dGiB' % end
+
+    return start_str, end_str, end