Add CreateVolume class to v3

This patch acts as a base framework to add the parameters needed
for manage volume support.
This includes 2 changes:
1. Move get_parser and take_action code to common methods which
can be utilized by both v2 and v3
2. Make _check_size_arg as a static method and move it inside
CreateVolume class since it's not used by other classes.

[2] was initially thought to be a follow up change but since we
are implementing changes into the _check_size_arg method for v3,
it makes sense to just include it in CreateVolume class to avoid
adding a new additional method. Similar changes are done for v2
as well.

Change-Id: I9315e457ebd6c5ba4cc67452f92c9dc8c139ee3c

openstackclient/volume/v2/volume.py

@@ -88,6 +88,10 @@ class AttachmentsColumn(cliff_columns.FormattableColumn):
         return msg
 
 
+class CreateVolume(command.ShowOne):
+    _description = _("Create new volume")
+
+    @staticmethod
     def _check_size_arg(args):
         """Check whether --size option is required or not.
 
@@ -104,11 +108,7 @@ def _check_size_arg(args):
             )
             raise exceptions.CommandError(msg)
 
-
-class CreateVolume(command.ShowOne):
-    _description = _("Create new volume")
-
-    def get_parser(self, prog_name):
+    def _get_parser(self, prog_name):
         parser = super().get_parser(prog_name)
         parser.add_argument(
             "name",
@@ -216,10 +216,14 @@ class CreateVolume(command.ShowOne):
             action="store_true",
             help=_("Set volume to read-write access mode (default)"),
         )
+        return parser, source_group
+
+    def get_parser(self, prog_name):
+        parser, _ = self._get_parser(prog_name)
         return parser
 
-    def take_action(self, parsed_args):
-        _check_size_arg(parsed_args)
+    def _take_action(self, parsed_args):
+        CreateVolume._check_size_arg(parsed_args)
         # size is validated in the above call to
         # _check_size_arg where we check that size
         # should be passed if we are not creating a
@@ -355,6 +359,9 @@ class CreateVolume(command.ShowOne):
         volume._info.pop("links", None)
         return zip(*sorted(volume._info.items()))
 
+    def take_action(self, parsed_args):
+        return self._take_action(parsed_args)
+
 
 class DeleteVolume(command.Command):
     _description = _("Delete volume(s)")

openstackclient/volume/v3/volume.py

@@ -23,7 +23,7 @@ from osc_lib import exceptions
 from osc_lib import utils
 
 from openstackclient.i18n import _
-
+from openstackclient.volume.v2 import volume as volume_v2
 
 LOG = logging.getLogger(__name__)
 
@@ -113,3 +113,34 @@ class VolumeRevertToSnapshot(command.Command):
         )
 
         volume_client.revert_volume_to_snapshot(volume, snapshot)
+
+
+class CreateVolume(volume_v2.CreateVolume):
+    _description = _("Create new volume")
+
+    @staticmethod
+    def _check_size_arg(args):
+        """Check whether --size option is required or not.
+
+        Require size parameter in case if any of the following is not specified:
+        * snapshot
+        * source volume
+        * backup
+        * remote source (volume to be managed)
+        """
+
+        if (
+            args.snapshot or args.source or args.backup or args.remote_source
+        ) is None and args.size is None:
+            msg = _(
+                "--size is a required option if none of --snapshot, "
+                "--backup, --source, or --remote-source are provided."
+            )
+            raise exceptions.CommandError(msg)
+
+    def get_parser(self, prog_name):
+        parser, _ = self._get_parser(prog_name)
+        return parser
+
+    def take_action(self, parsed_args):
+        return self._take_action(parsed_args)

setup.cfg

@@ -765,7 +765,7 @@ openstack.volume.v3 =
     consistency_group_snapshot_list = openstackclient.volume.v2.consistency_group_snapshot:ListConsistencyGroupSnapshot
     consistency_group_snapshot_show = openstackclient.volume.v2.consistency_group_snapshot:ShowConsistencyGroupSnapshot
 
-    volume_create = openstackclient.volume.v2.volume:CreateVolume
+    volume_create = openstackclient.volume.v3.volume:CreateVolume
     volume_delete = openstackclient.volume.v2.volume:DeleteVolume
     volume_list = openstackclient.volume.v2.volume:ListVolume
     volume_migrate = openstackclient.volume.v2.volume:MigrateVolume