[compute] Add server backup function

Add server backup function

There is no return value for this command per following doc
http://developer.openstack.org/api-ref-compute-v2.1.html#createBackup,
also novaclient can't be updated now due to backward compatible issue
http://lists.openstack.org/pipermail/openstack-dev/2016-March/089376.html,
so we have to get the information ourselves.

The Image tests were not using warlock images, so that needed to be fixed
before we could completely test things like --wait.

Change-Id: I30159518c4d3fdec89f15963bda641a0b03962d1

Author: jichenjc

doc/source/command-objects/server-backup.rst

@@ -0,0 +1,44 @@
+=============
+server backup
+=============
+
+A server backup is a disk image created in the Image store from a running server
+instance.  The backup command manages the number of archival copies to retain.
+
+Compute v2
+
+server backup create
+--------------------
+
+Create a server backup image
+
+.. program:: server create
+.. code:: bash
+
+    os server backup create
+        [--name <image-name>]
+        [--type <backup-type>]
+        [--rotate <count>]
+        [--wait]
+        <server>
+
+.. option:: --name <image-name>
+
+    Name of the backup image (default: server name)
+
+.. option:: --type <backup-type>
+
+    Used to populate the ``backup_type`` property of the backup
+    image (default: empty)
+
+.. option:: --rotate <count>
+
+    Number of backup images to keep (default: 1)
+
+.. option:: --wait
+
+    Wait for operation to complete
+
+.. describe:: <server>
+
+    Server to back up (name or ID)

doc/source/commands.rst

@@ -118,6 +118,7 @@ referring to both Compute and Volume quotas.
 * ``security group``: (**Compute**, **Network**) - groups of network access rules
 * ``security group rule``: (**Compute**, **Network**) - the individual rules that define protocol/IP/port access
 * ``server``: (**Compute**) virtual machine instance
+* ``server backup``: (**Compute**) backup server disk image by using snapshot method
 * ``server dump``: (**Compute**) a dump file of a server created by features like kdump
 * ``server group``: (**Compute**) a grouping of servers
 * ``server image``: (**Compute**) saved server disk image

openstackclient/compute/v2/server_backup.py

@@ -0,0 +1,134 @@
+#   Copyright 2012-2013 OpenStack Foundation
+#
+#   Licensed under the Apache License, Version 2.0 (the "License"); you may
+#   not use this file except in compliance with the License. You may obtain
+#   a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#   WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#   License for the specific language governing permissions and limitations
+#   under the License.
+#
+
+"""Compute v2 Server action implementations"""
+
+import sys
+
+from oslo_utils import importutils
+import six
+
+from openstackclient.common import command
+from openstackclient.common import exceptions
+from openstackclient.common import utils
+from openstackclient.i18n import _
+
+
+def _show_progress(progress):
+    if progress:
+        sys.stderr.write('\rProgress: %s' % progress)
+        sys.stderr.flush()
+
+
+class CreateServerBackup(command.ShowOne):
+    """Create a server backup image"""
+
+    IMAGE_API_VERSIONS = {
+        "1": "openstackclient.image.v1.image",
+        "2": "openstackclient.image.v2.image",
+    }
+
+    def get_parser(self, prog_name):
+        parser = super(CreateServerBackup, self).get_parser(prog_name)
+        parser.add_argument(
+            'server',
+            metavar='<server>',
+            help=_('Server to back up (name or ID)'),
+        )
+        parser.add_argument(
+            '--name',
+            metavar='<image-name>',
+            help=_('Name of the backup image (default: server name)'),
+        )
+        parser.add_argument(
+            '--type',
+            metavar='<backup-type>',
+            help=_(
+                'Used to populate the backup_type property of the backup '
+                'image (default: empty)'
+            ),
+        )
+        parser.add_argument(
+            '--rotate',
+            metavar='<count>',
+            type=int,
+            help=_('Number of backups to keep (default: 1)'),
+        )
+        parser.add_argument(
+            '--wait',
+            action='store_true',
+            help=_('Wait for backup image create to complete'),
+        )
+        return parser
+
+    def take_action(self, parsed_args):
+        compute_client = self.app.client_manager.compute
+
+        server = utils.find_resource(
+            compute_client.servers,
+            parsed_args.server,
+        )
+
+        # Set sane defaults as this API wants all mouths to be fed
+        if parsed_args.name is None:
+            backup_name = server.name
+        else:
+            backup_name = parsed_args.name
+        if parsed_args.type is None:
+            backup_type = ""
+        else:
+            backup_type = parsed_args.type
+        if parsed_args.rotate is None:
+            backup_rotation = 1
+        else:
+            backup_rotation = parsed_args.rotate
+
+        compute_client.servers.backup(
+            server.id,
+            backup_name,
+            backup_type,
+            backup_rotation,
+        )
+
+        image_client = self.app.client_manager.image
+        image = utils.find_resource(
+            image_client.images,
+            backup_name,
+        )
+
+        if parsed_args.wait:
+            if utils.wait_for_status(
+                image_client.images.get,
+                image.id,
+                callback=_show_progress,
+            ):
+                sys.stdout.write('\n')
+            else:
+                msg = _('Error creating server backup: %s') % parsed_args.name
+                raise exceptions.CommandError(msg)
+
+        if self.app.client_manager._api_version['image'] == '1':
+            info = {}
+            info.update(image._info)
+            info['properties'] = utils.format_dict(info.get('properties', {}))
+        else:
+            # Get the right image module to format the output
+            image_module = importutils.import_module(
+                self.IMAGE_API_VERSIONS[
+                    self.app.client_manager._api_version['image']
+                ]
+            )
+            info = image_module._format_image(image)
+        return zip(*sorted(six.iteritems(info)))