ceph/src/ceph-volume/ceph_volume/util/arg_validators.py

   1 import argparse
   2
   3
   4 class LVPath(object):
   5     """
   6     A simple validator to ensure that a logical volume is specified like::
   7
   8         <vg name>/<lv name>
   9
  10     Because for LVM it is better to be specific on what group does an lv
  11     belongs to.
  12     """
  13
  14     def __call__(self, string):
  15         error = None
  16         try:
  17             vg, lv = string.split('/')
  18         except ValueError:
  19             error = "Logical volume must be specified as 'volume_group/logical_volume' but got: %s" % string
  20             raise argparse.ArgumentError(None, error)
  21
  22         if not vg:
  23             error = "Didn't specify a volume group like 'volume_group/logical_volume', got: %s" % string
  24         if not lv:
  25             error = "Didn't specify a logical volume like 'volume_group/logical_volume', got: %s" % string
  26
  27         if error:
  28             raise argparse.ArgumentError(None, error)
  29         return string