ceph-volume: devices.lvm create a common module for sharing parsers

Signed-off-by: Alfredo Deza <adeza@redhat.com>

src/ceph-volume/ceph_volume/devices/lvm/common.py

@@ -0,0 +1,55 @@
+import argparse
+
+
+def common_parser(prog, description):
+    """
+    Both prepare and create share the same parser, those are defined here to
+    avoid duplication
+    """
+    parser = argparse.ArgumentParser(
+        prog=prog,
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description=description,
+    )
+    required_args = parser.add_argument_group('required arguments')
+    parser.add_argument(
+        '--journal',
+        help='A logical group name, path to a logical volume, or path to a device',
+    )
+    required_args.add_argument(
+        '--data',
+        required=True,
+        help='A logical group name or a path to a logical volume',
+    )
+    parser.add_argument(
+        '--journal-size',
+        default=5,
+        metavar='GB',
+        type=int,
+        help='Size (in GB) A logical group name or a path to a logical volume',
+    )
+    parser.add_argument(
+        '--bluestore',
+        action='store_true', default=False,
+        help='Use the bluestore objectstore (not currently supported)',
+    )
+    parser.add_argument(
+        '--filestore',
+        action='store_true', default=True,
+        help='Use the filestore objectstore (currently the only supported object store)',
+    )
+    parser.add_argument(
+        '--osd-id',
+        help='Reuse an existing OSD id',
+    )
+    parser.add_argument(
+        '--osd-fsid',
+        help='Reuse an existing OSD fsid',
+    )
+    # Do not parse args, so that consumers can do something before the args get
+    # parsed triggering argparse behavior
+    return parser
+
+
+create_parser = common_parser  # noqa
+prepare_parser = common_parser  # noqa