ceph-volume: lvm.prepare: initial take on the module with flags

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

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

@@ -0,0 +1,82 @@
+import argparse
+from textwrap import dedent
+from ceph_volume import process
+from ceph_volume.systemd import systemctl
+import api
+
+
+class Prepare(object):
+
+    help = 'Format an LVM device and associate it with an OSD'
+
+    def __init__(self, argv):
+        self.argv = argv
+
+    def main(self):
+        sub_command_help = dedent("""
+        Prepare an OSD by assigning an ID and FSID, registering them with the
+        cluster with an ID and FSID, formatting and mounting the volume, and
+        finally by adding all the metadata to the logical volumes using LVM
+        tags, so that it can later be discovered.
+
+        Once the OSD is ready, an ad-hoc systemd unit will be enabled so that
+        it can later get activated and the OSD daemon can get started.
+
+        Most basic Usage looks like (journal will be collocated from the same volume group):
+
+            ceph-volume lvm prepare --data {volume group name}
+
+
+        Example calls for supported scenarios:
+
+        Dedicated volume group for Journal(s)
+        -------------------------------------
+
+          Existing logical volume (lv) or device:
+
+              ceph-volume lvm prepare --data {volume group} --journal /path/to/{lv}|{device}
+
+          Or:
+
+              ceph-volume lvm prepare --data {data volume group} --journal {journal volume group}
+
+        Collocated (same group) for data and journal
+        --------------------------------------------
+
+              ceph-volume lvm prepare --data {volume group}
+
+        """)
+        parser = argparse.ArgumentParser(
+            prog='ceph-volume lvm activate',
+            formatter_class=argparse.RawDescriptionHelpFormatter,
+            description=sub_command_help,
+        )
+        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)',
+        )
+        args = parser.parse_args(self.argv[1:])
+        self.activate(args)