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> 2009-2011
   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 import textwrap
  27
  28 class Option(optparse.Option):
  29     pass
  30
  31 # This help formatter does text wrapping and preserves newlines
  32 class PlainHelpFormatter(optparse.IndentedHelpFormatter):
  33     def format_description(self,description=""):
  34             desc_width = self.width - self.current_indent
  35             indent = " "*self.current_indent
  36             paragraphs = description.split('\n')
  37             wrapped_paragraphs = [
  38                 textwrap.fill(p,
  39                         desc_width,
  40                         initial_indent=indent,
  41                         subsequent_indent=indent)
  42                 for p in paragraphs]
  43             result = "\n".join(wrapped_paragraphs) + "\n"
  44             return result
  45
  46
  47 class Command(object):
  48     """A samba-tool command."""
  49
  50     def _get_short_description(self):
  51         return self.__doc__.splitlines()[0].rstrip("\n")
  52
  53     short_description = property(_get_short_description)
  54
  55     def _get_full_description(self):
  56         lines = self.__doc__.split("\n")
  57         return lines[0] + "\n" + textwrap.dedent("\n".join(lines[1:]))
  58
  59     full_description = property(_get_full_description)
  60
  61     def _get_name(self):
  62         name = self.__class__.__name__
  63         if name.startswith("cmd_"):
  64             return name[4:]
  65         return name
  66
  67     name = property(_get_name)
  68
  69     # synopsis must be defined in all subclasses in order to provide the
  70     # command usage
  71     synopsis = None
  72     takes_args = []
  73     takes_options = []
  74     takes_optiongroups = {
  75         "sambaopts": options.SambaOptions,
  76         "credopts": options.CredentialsOptions,
  77         "versionopts": options.VersionOptions,
  78         }
  79
  80     def __init__(self, outf=sys.stdout, errf=sys.stderr):
  81         self.outf = outf
  82         self.errf = errf
  83
  84     def usage(self, prog, *args):
  85         parser, _ = self._create_parser(prog)
  86         parser.print_usage()
  87
  88     def show_command_error(self, e):
  89         '''display a command error'''
  90         if isinstance(e, CommandError):
  91             (etype, evalue, etraceback) = e.exception_info
  92             inner_exception = e.inner_exception
  93             message = e.message
  94             force_traceback = False
  95         else:
  96             (etype, evalue, etraceback) = sys.exc_info()
  97             inner_exception = e
  98             message = "uncaught exception"
  99             force_traceback = True
 100
 101         if isinstance(inner_exception, LdbError):
 102             (ldb_ecode, ldb_emsg) = inner_exception
 103             self.errf.write("ERROR(ldb): %s - %s\n" % (message, ldb_emsg))
 104         elif isinstance(inner_exception, AssertionError):
 105             self.errf.write("ERROR(assert): %s\n" % message)
 106             force_traceback = True
 107         elif isinstance(inner_exception, RuntimeError):
 108             self.errf.write("ERROR(runtime): %s - %s\n" % (message, evalue))
 109         elif type(inner_exception) is Exception:
 110             self.errf.write("ERROR(exception): %s - %s\n" % (message, evalue))
 111             force_traceback = True
 112         elif inner_exception is None:
 113             self.errf.write("ERROR: %s\n" % (message))
 114         else:
 115             self.errf.write("ERROR(%s): %s - %s\n" % (str(etype), message, evalue))
 116             force_traceback = True
 117
 118         if force_traceback or samba.get_debug_level() >= 3:
 119             traceback.print_tb(etraceback)
 120
 121     def _create_parser(self, prog):
 122         parser = optparse.OptionParser(
 123             usage=self.synopsis,
 124             description=self.full_description,
 125             formatter=PlainHelpFormatter(),
 126             prog=prog)
 127         parser.add_options(self.takes_options)
 128         optiongroups = {}
 129         for name, optiongroup in self.takes_optiongroups.iteritems():
 130             optiongroups[name] = optiongroup(parser)
 131             parser.add_option_group(optiongroups[name])
 132         return parser, optiongroups
 133
 134     def message(self, text):
 135         self.outf.write(text+"\n")
 136
 137     def _run(self, *argv):
 138         parser, optiongroups = self._create_parser(argv[0])
 139         opts, args = parser.parse_args(list(argv))
 140         # Filter out options from option groups
 141         args = args[1:]
 142         kwargs = dict(opts.__dict__)
 143         for option_group in parser.option_groups:
 144             for option in option_group.option_list:
 145                 if option.dest is not None:
 146                     del kwargs[option.dest]
 147         kwargs.update(optiongroups)
 148
 149         # Check for a min a max number of allowed arguments, whenever possible
 150         # The suffix "?" means zero or one occurence
 151         # The suffix "+" means at least one occurence
 152         min_args = 0
 153         max_args = 0
 154         undetermined_max_args = False
 155         for i, arg in enumerate(self.takes_args):
 156             if arg[-1] != "?":
 157                min_args += 1
 158             if arg[-1] == "+":
 159                undetermined_max_args = True
 160             else:
 161                max_args += 1
 162         if (len(args) < min_args) or (undetermined_max_args == False and len(args) > max_args):
 163             parser.print_usage()
 164             return -1
 165
 166         try:
 167             return self.run(*args, **kwargs)
 168         except Exception, e:
 169             self.show_command_error(e)
 170             return -1
 171
 172     def run(self):
 173         """Run the command. This should be overriden by all subclasses."""
 174         raise NotImplementedError(self.run)
 175
 176     def get_logger(self, name="netcmd"):
 177         """Get a logger object."""
 178         import logging
 179         logger = logging.getLogger(name)
 180         logger.addHandler(logging.StreamHandler(self.outf))
 181         return logger
 182
 183
 184 class SuperCommand(Command):
 185     """A samba-tool command with subcommands."""
 186
 187     synopsis = "%prog <subcommand>"
 188
 189     subcommands = {}
 190
 191     def _run(self, myname, subcommand=None, *args):
 192         if subcommand in self.subcommands:
 193             return self.subcommands[subcommand]._run(
 194                 "%s %s" % (myname, subcommand), *args)
 195
 196         self.usage(myname)
 197         self.outf.write("Available subcommands:\n")
 198         subcmds = self.subcommands.keys()
 199         subcmds.sort()
 200         max_length = max([len(c) for c in subcmds])
 201         for cmd in subcmds:
 202             self.outf.write("  %*s  - %s\n" % (
 203                 -max_length, cmd, self.subcommands[cmd].short_description))
 204         if subcommand in [None]:
 205             raise CommandError("You must specify a subcommand")
 206         if subcommand in ['help', '-h', '--help']:
 207             self.outf.write("For more help on a specific subcommand, please type: %s (-h|--help)\n" % myname)
 208             return 0
 209         raise CommandError("No such subcommand '%s'" % subcommand)
 210
 211
 212
 213 class CommandError(Exception):
 214     """An exception class for samba-tool Command errors."""
 215
 216     def __init__(self, message, inner_exception=None):
 217         self.message = message
 218         self.inner_exception = inner_exception
 219         self.exception_info = sys.exc_info()