source4/scripting/python/samba/netcmd/__init__.py

   1 #!/usr/bin/env python
   2
   3 # Unix SMB/CIFS implementation.
   4 # Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2009
   5 # Copyright (C) Theresa Halloran <theresahalloran@gmail.com> 2011
   6 # Copyright (C) Giampaolo Lauria <lauria2@yahoo.com> 2011
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 3 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 #
  21
  22 import optparse, samba
  23 from samba import getopt as options
  24 from ldb import LdbError
  25 import sys, traceback
  26
  27
  28 class Option(optparse.Option):
  29     pass
  30
  31
  32
  33 class Command(object):
  34     """A samba-tool command."""
  35
  36     def _get_description(self):
  37         return self.__doc__.splitlines()[0].rstrip("\n")
  38
  39     description = property(_get_description)
  40
  41     # synopsis must be defined in all subclasses in order to provide the command usage
  42     synopsis = ""
  43     # long_description is a string describing the command in details
  44     long_description = ""
  45     takes_args = []
  46     takes_options = []
  47     takes_optiongroups = {
  48         "sambaopts": options.SambaOptions,
  49         "credopts": options.CredentialsOptions,
  50         "versionopts": options.VersionOptions,
  51         }
  52     # This epilog will print at the end when the user invokes the command w/ -h or --help
  53     epilog = ""
  54     outf = sys.stdout
  55
  56     def usage(self, *args):
  57         parser, _ = self._create_parser()
  58         parser.print_usage()
  59
  60     def show_command_error(self, e):
  61         '''display a command error'''
  62         if isinstance(e, CommandError):
  63             (etype, evalue, etraceback) = e.exception_info
  64             inner_exception = e.inner_exception
  65             message = e.message
  66             force_traceback = False
  67         else:
  68             (etype, evalue, etraceback) = sys.exc_info()
  69             inner_exception = e
  70             message = "uncaught exception"
  71             force_traceback = True
  72
  73         if isinstance(inner_exception, LdbError):
  74             (ldb_ecode, ldb_emsg) = inner_exception
  75             print >>sys.stderr, "ERROR(ldb): %s - %s" % (message, ldb_emsg)
  76         elif isinstance(inner_exception, AssertionError):
  77             print >>sys.stderr, "ERROR(assert): %s" % message
  78             force_traceback = True
  79         elif isinstance(inner_exception, RuntimeError):
  80             print >>sys.stderr, "ERROR(runtime): %s - %s" % (message, evalue)
  81         elif type(inner_exception) is Exception:
  82             print >>sys.stderr, "ERROR(exception): %s - %s" % (message, evalue)
  83             force_traceback = True
  84         elif inner_exception is None:
  85             print >>sys.stderr, "ERROR: %s" % (message)
  86         else:
  87             print >>sys.stderr, "ERROR(%s): %s - %s" % (str(etype), message, evalue)
  88             force_traceback = True
  89
  90         if force_traceback or samba.get_debug_level() >= 3:
  91             traceback.print_tb(etraceback)
  92         sys.exit(1)
  93
  94     def _create_parser(self):
  95         parser = optparse.OptionParser(usage=self.synopsis, epilog=self.epilog,
  96                                        description=self.long_description)
  97         parser.add_options(self.takes_options)
  98         optiongroups = {}
  99         for name, optiongroup in self.takes_optiongroups.iteritems():
 100             optiongroups[name] = optiongroup(parser)
 101             parser.add_option_group(optiongroups[name])
 102         return parser, optiongroups
 103
 104     def message(self, text):
 105         print text
 106
 107     def _run(self, *argv):
 108         parser, optiongroups = self._create_parser()
 109         opts, args = parser.parse_args(list(argv))
 110         # Filter out options from option groups
 111         args = args[1:]
 112         kwargs = dict(opts.__dict__)
 113         for option_group in parser.option_groups:
 114             for option in option_group.option_list:
 115                 if option.dest is not None:
 116                     del kwargs[option.dest]
 117         kwargs.update(optiongroups)
 118
 119         # Check for a min a max number of allowed arguments, whenever possible
 120         # The suffix "?" means zero or one occurence
 121         # The suffix "+" means at least one occurence
 122         min_args = 0
 123         max_args = 0
 124         undetermined_max_args = False
 125         for i, arg in enumerate(self.takes_args):
 126             if arg[-1] != "?":
 127                min_args += 1
 128             if arg[-1] == "+":
 129                undetermined_max_args = True
 130             else:
 131                max_args += 1
 132         if (len(args) < min_args) or (undetermined_max_args == False and len(args) > max_args):
 133             parser.print_usage()
 134             return -1
 135
 136         try:
 137             return self.run(*args, **kwargs)
 138         except Exception, e:
 139             self.show_command_error(e)
 140             return -1
 141
 142     def run(self):
 143         """Run the command. This should be overriden by all subclasses."""
 144         raise NotImplementedError(self.run)
 145
 146
 147
 148 class SuperCommand(Command):
 149     """A samba-tool command with subcommands."""
 150
 151     subcommands = {}
 152
 153     def _run(self, myname, subcommand=None, *args):
 154         if subcommand in self.subcommands:
 155             return self.subcommands[subcommand]._run(subcommand, *args)
 156
 157         if (myname == "samba-tool"):
 158             usage = "samba-tool <subcommand>"
 159         else:
 160             usage = "samba-tool %s <subcommand>" % myname
 161         print "Usage: %s [options]" %usage
 162         print "Available subcommands:"
 163         subcmds = self.subcommands.keys()
 164         subcmds.sort()
 165         for cmd in subcmds:
 166             print "    %-20s - %s" % (cmd, self.subcommands[cmd].description)
 167         if subcommand in [None]:
 168             raise CommandError("You must specify a subcommand")
 169         if subcommand in ['help', '-h', '--help']:
 170             print "For more help on a specific subcommand, please type: %s (-h|--help)" % usage
 171             return 0
 172         raise CommandError("No such subcommand '%s'" % subcommand)
 173
 174
 175
 176 class CommandError(Exception):
 177     '''an exception class for samba-tool cmd errors'''
 178     def __init__(self, message, inner_exception=None):
 179         self.message = message
 180         self.inner_exception = inner_exception
 181         self.exception_info = sys.exc_info()