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1#
2# Chris Lumens <clumens@redhat.com>
3#
4# Copyright 2006, 2007, 2008 Red Hat, Inc.
5#
6# This copyrighted material is made available to anyone wishing to use, modify,
7# copy, or redistribute it subject to the terms and conditions of the GNU
8# General Public License v.2. This program is distributed in the hope that it
9# will be useful, but WITHOUT ANY WARRANTY expressed or implied, including the
10# implied warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11# See the GNU General Public License for more details.
12#
13# You should have received a copy of the GNU General Public License along with
14# this program; if not, write to the Free Software Foundation, Inc., 51
15# Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. Any Red Hat
16# trademarks that are incorporated in the source code or documentation are not
17# subject to the GNU General Public License and may only be used or replicated
18# with the express permission of Red Hat, Inc.
19#
20"""
21Base classes for creating commands and syntax version object.
22
23This module exports several important base classes:
24
25 BaseData - The base abstract class for all data objects. Data objects
26 are contained within a BaseHandler object.
27
28 BaseHandler - The base abstract class from which versioned kickstart
29 handler are derived. Subclasses of BaseHandler hold
30 BaseData and KickstartCommand objects.
31
32 DeprecatedCommand - An abstract subclass of KickstartCommand that should
33 be further subclassed by users of this module. When
34 a subclass is used, a warning message will be
35 printed.
36
37 KickstartCommand - The base abstract class for all kickstart commands.
38 Command objects are contained within a BaseHandler
39 object.
40"""
41import gettext
42gettext.textdomain("pykickstart")
43_ = lambda x: gettext.ldgettext("pykickstart", x)
44
45import types
46import warnings
47from pykickstart.errors import *
48from pykickstart.ko import *
49from pykickstart.parser import Packages
50from pykickstart.version import versionToString
51
52###
53### COMMANDS
54###
55class KickstartCommand(KickstartObject):
56 """The base class for all kickstart commands. This is an abstract class."""
57 removedKeywords = []
58 removedAttrs = []
59
60 def __init__(self, writePriority=0, *args, **kwargs):
61 """Create a new KickstartCommand instance. This method must be
62 provided by all subclasses, but subclasses must call
63 KickstartCommand.__init__ first. Instance attributes:
64
65 currentCmd -- The name of the command in the input file that
66 caused this handler to be run.
67 currentLine -- The current unprocessed line from the input file
68 that caused this handler to be run.
69 handler -- A reference to the BaseHandler subclass this
70 command is contained withing. This is needed to
71 allow referencing of Data objects.
72 lineno -- The current line number in the input file.
73 writePriority -- An integer specifying when this command should be
74 printed when iterating over all commands' __str__
75 methods. The higher the number, the later this
76 command will be written. All commands with the
77 same priority will be written alphabetically.
78 """
79
80 # We don't want people using this class by itself.
81 if self.__class__ is KickstartCommand:
82 raise TypeError, "KickstartCommand is an abstract class."
83
84 KickstartObject.__init__(self, *args, **kwargs)
85
86 self.writePriority = writePriority
87
88 # These will be set by the dispatcher.
89 self.currentCmd = ""
90 self.currentLine = ""
91 self.handler = None
92 self.lineno = 0
93
94 # If a subclass provides a removedKeywords list, remove all the
95 # members from the kwargs list before we start processing it. This
96 # ensures that subclasses don't continue to recognize arguments that
97 # were removed.
98 for arg in filter(kwargs.has_key, self.removedKeywords):
99 kwargs.pop(arg)
100
101 def __call__(self, *args, **kwargs):
102 """Set multiple attributes on a subclass of KickstartCommand at once
103 via keyword arguments. Valid attributes are anything specified in
104 a subclass, but unknown attributes will be ignored.
105 """
106 for (key, val) in kwargs.items():
107 # Ignore setting attributes that were removed in a subclass, as
108 # if they were unknown attributes.
109 if key in self.removedAttrs:
110 continue
111
112 if hasattr(self, key):
113 setattr(self, key, val)
114
115 def __str__(self):
116 """Return a string formatted for output to a kickstart file. This
117 method must be provided by all subclasses.
118 """
119 return KickstartObject.__str__(self)
120
121 def parse(self, args):
122 """Parse the list of args and set data on the KickstartCommand object.
123 This method must be provided by all subclasses.
124 """
125 raise TypeError, "parse() not implemented for KickstartCommand"
126
127 def apply(self, instroot="/"):
128 """Write out the configuration related to the KickstartCommand object.
129 Subclasses which do not provide this method will not have their
130 configuration written out.
131 """
132 return
133
134 def dataList(self):
135 """For commands that can occur multiple times in a single kickstart
136 file (like network, part, etc.), return the list that we should
137 append more data objects to.
138 """
139 return None
140
141 def deleteRemovedAttrs(self):
142 """Remove all attributes from self that are given in the removedAttrs
143 list. This method should be called from __init__ in a subclass,
144 but only after the superclass's __init__ method has been called.
145 """
146 for attr in filter(lambda k: hasattr(self, k), self.removedAttrs):
147 delattr(self, attr)
148
149 # Set the contents of the opts object (an instance of optparse.Values
150 # returned by parse_args) as attributes on the KickstartCommand object.
151 # It's useful to call this from KickstartCommand subclasses after parsing
152 # the arguments.
153 def _setToSelf(self, optParser, opts):
154 self._setToObj(optParser, opts, self)
155
156 # Sets the contents of the opts object (an instance of optparse.Values
157 # returned by parse_args) as attributes on the provided object obj. It's
158 # useful to call this from KickstartCommand subclasses that handle lists
159 # of objects (like partitions, network devices, etc.) and need to populate
160 # a Data object.
161 def _setToObj(self, optParser, opts, obj):
162 for key in filter (lambda k: getattr(opts, k) != None, optParser.keys()):
163 setattr(obj, key, getattr(opts, key))
164
165class DeprecatedCommand(KickstartCommand):
166 """Specify that a command is deprecated and no longer has any function.
167 Any command that is deprecated should be subclassed from this class,
168 only specifying an __init__ method that calls the superclass's __init__.
169 This is an abstract class.
170 """
171 def __init__(self, writePriority=None, *args, **kwargs):
172 # We don't want people using this class by itself.
173 if self.__class__ is KickstartCommand:
174 raise TypeError, "DeprecatedCommand is an abstract class."
175
176 # Create a new DeprecatedCommand instance.
177 KickstartCommand.__init__(self, writePriority, *args, **kwargs)
178
179 def __str__(self):
180 """Placeholder since DeprecatedCommands don't work anymore."""
181 return ""
182
183 def parse(self, args):
184 """Print a warning message if the command is seen in the input file."""
185 mapping = {"lineno": self.lineno, "cmd": self.currentCmd}
186 warnings.warn(_("Ignoring deprecated command on line %(lineno)s: The %(cmd)s command has been deprecated and no longer has any effect. It may be removed from future releases, which will result in a fatal error from kickstart. Please modify your kickstart file to remove this command.") % mapping, DeprecationWarning)
187
188
189###
190### HANDLERS
191###
192class BaseHandler(KickstartObject):
193 """Each version of kickstart syntax is provided by a subclass of this
194 class. These subclasses are what users will interact with for parsing,
195 extracting data, and writing out kickstart files. This is an abstract
196 class.
197
198 version -- The version this syntax handler supports. This is set by
199 a class attribute of a BaseHandler subclass and is used to
200 set up the command dict. It is for read-only use.
201 """
202 version = None
203
204 def __init__(self, mapping=None, dataMapping=None, commandUpdates=None,
205 dataUpdates=None, *args, **kwargs):
206 """Create a new BaseHandler instance. This method must be provided by
207 all subclasses, but subclasses must call BaseHandler.__init__ first.
208
209 mapping -- A custom map from command strings to classes,
210 useful when creating your own handler with
211 special command objects. It is otherwise unused
212 and rarely needed. If you give this argument,
213 the mapping takes the place of the default one
214 and so must include all commands you want
215 recognized.
216 dataMapping -- This is the same as mapping, but for data
217 objects. All the same comments apply.
218 commandUpdates -- This is similar to mapping, but does not take
219 the place of the defaults entirely. Instead,
220 this mapping is applied after the defaults and
221 updates it with just the commands you want to
222 modify.
223 dataUpdates -- This is the same as commandUpdates, but for
224 data objects.
225
226
227 Instance attributes:
228
229 commands -- A mapping from a string command to a KickstartCommand
230 subclass object that handles it. Multiple strings can
231 map to the same object, but only one instance of the
232 command object should ever exist. Most users should
233 never have to deal with this directly, as it is
234 manipulated internally and called through dispatcher.
235 currentLine -- The current unprocessed line from the input file
236 that caused this handler to be run.
237 packages -- An instance of pykickstart.parser.Packages which
238 describes the packages section of the input file.
239 platform -- A string describing the hardware platform, which is
240 needed only by system-config-kickstart.
241 scripts -- A list of pykickstart.parser.Script instances, which is
242 populated by KickstartParser.addScript and describes the
243 %pre/%post/%traceback script section of the input file.
244 """
245
246 # We don't want people using this class by itself.
247 if self.__class__ is BaseHandler:
248 raise TypeError, "BaseHandler is an abstract class."
249
250 KickstartObject.__init__(self, *args, **kwargs)
251
252 # This isn't really a good place for these, but it's better than
253 # everything else I can think of.
254 self.scripts = []
255 self.packages = Packages()
256 self.platform = ""
257
258 # These will be set by the dispatcher.
259 self.commands = {}
260 self.currentLine = 0
261
262 # A dict keyed by an integer priority number, with each value being a
263 # list of KickstartCommand subclasses. This dict is maintained by
264 # registerCommand and used in __str__. No one else should be touching
265 # it.
266 self._writeOrder = {}
267
268 self._registerCommands(mapping, dataMapping, commandUpdates, dataUpdates)
269
270 def __str__(self):
271 """Return a string formatted for output to a kickstart file."""
272 retval = ""
273
274 if self.platform != "":
275 retval += "#platform=%s\n" % self.platform
276
277 retval += "#version=%s\n" % versionToString(self.version)
278
279 lst = self._writeOrder.keys()
280 lst.sort()
281
282 for prio in lst:
283 for obj in self._writeOrder[prio]:
284 retval += obj.__str__()
285
286 for script in self.scripts:
287 retval += script.__str__()
288
289 retval += self.packages.__str__()
290
291 return retval
292
293 def _insertSorted(self, lst, obj):
294 length = len(lst)
295 i = 0
296
297 while i < length:
298 # If the two classes have the same name, it's because we are
299 # overriding an existing class with one from a later kickstart
300 # version, so remove the old one in favor of the new one.
301 if obj.__class__.__name__ > lst[i].__class__.__name__:
302 i += 1
303 elif obj.__class__.__name__ == lst[i].__class__.__name__:
304 lst[i] = obj
305 return
306 elif obj.__class__.__name__ < lst[i].__class__.__name__:
307 break
308
309 if i >= length:
310 lst.append(obj)
311 else:
312 lst.insert(i, obj)
313
314 def _setCommand(self, cmdObj):
315 # Add an attribute on this version object. We need this to provide a
316 # way for clients to access the command objects. We also need to strip
317 # off the version part from the front of the name.
318 if cmdObj.__class__.__name__.find("_") != -1:
319 name = unicode(cmdObj.__class__.__name__.split("_", 1)[1])
320 else:
321 name = unicode(cmdObj.__class__.__name__).lower()
322
323 setattr(self, name.lower(), cmdObj)
324
325 # Also, add the object into the _writeOrder dict in the right place.
326 if cmdObj.writePriority is not None:
327 if self._writeOrder.has_key(cmdObj.writePriority):
328 self._insertSorted(self._writeOrder[cmdObj.writePriority], cmdObj)
329 else:
330 self._writeOrder[cmdObj.writePriority] = [cmdObj]
331
332 def _registerCommands(self, mapping=None, dataMapping=None, commandUpdates=None,
333 dataUpdates=None):
334 if mapping == {} or mapping == None:
335 from pykickstart.handlers.control import commandMap
336 cMap = commandMap[self.version]
337 else:
338 cMap = mapping
339
340 if dataMapping == {} or dataMapping == None:
341 from pykickstart.handlers.control import dataMap
342 dMap = dataMap[self.version]
343 else:
344 dMap = dataMapping
345
346 if type(commandUpdates) == types.DictType:
347 cMap.update(commandUpdates)
348
349 if type(dataUpdates) == types.DictType:
350 dMap.update(dataUpdates)
351
352 for (cmdName, cmdClass) in cMap.iteritems():
353 # First make sure we haven't instantiated this command handler
354 # already. If we have, we just need to make another mapping to
355 # it in self.commands.
356 cmdObj = None
357
358 for (key, val) in self.commands.iteritems():
359 if val.__class__.__name__ == cmdClass.__name__:
360 cmdObj = val
361 break
362
363 # If we didn't find an instance in self.commands, create one now.
364 if cmdObj == None:
365 cmdObj = cmdClass()
366 self._setCommand(cmdObj)
367
368 # Finally, add the mapping to the commands dict.
369 self.commands[cmdName] = cmdObj
370 self.commands[cmdName].handler = self
371
372 # We also need to create attributes for the various data objects.
373 # No checks here because dMap is a bijection. At least, that's what
374 # the comment says. Hope no one screws that up.
375 for (dataName, dataClass) in dMap.iteritems():
376 setattr(self, dataName, dataClass)
377
378 def dispatcher(self, args, lineno):
379 """Call the appropriate KickstartCommand handler for the current line
380 in the kickstart file. A handler for the current command should
381 be registered, though a handler of None is not an error. Returns
382 the data object returned by KickstartCommand.parse.
383
384 args -- A list of arguments to the current command
385 lineno -- The line number in the file, for error reporting
386 """
387 cmd = args[0]
388
389 if not self.commands.has_key(cmd):
390 raise KickstartParseError, formatErrorMsg(lineno, msg=_("Unknown command: %s" % cmd))
391 elif self.commands[cmd] != None:
392 self.commands[cmd].currentCmd = cmd
393 self.commands[cmd].currentLine = self.currentLine
394 self.commands[cmd].lineno = lineno
395
396 # The parser returns the data object that was modified. This could
397 # be a BaseData subclass that should be put into a list, or it
398 # could be the command handler object itself.
399 obj = self.commands[cmd].parse(args[1:])
400 lst = self.commands[cmd].dataList()
401 if lst is not None:
402 lst.append(obj)
403
404 return obj
405
406 def maskAllExcept(self, lst):
407 """Set all entries in the commands dict to None, except the ones in
408 the lst. All other commands will not be processed.
409 """
410 self._writeOrder = {}
411
412 for (key, val) in self.commands.iteritems():
413 if not key in lst:
414 self.commands[key] = None
415
416 def hasCommand(self, cmd):
417 """Return true if there is a handler for the string cmd."""
418 return hasattr(self, cmd)
419
420
421###
422### DATA
423###
424class BaseData(KickstartObject):
425 """The base class for all data objects. This is an abstract class."""
426 removedKeywords = []
427 removedAttrs = []
428
429 def __init__(self, *args, **kwargs):
430 """Create a new BaseData instance.
431
432 lineno -- Line number in the ks-file where this object was defined
433 """
434
435 # We don't want people using this class by itself.
436 if self.__class__ is BaseData:
437 raise TypeError, "BaseData is an abstract class."
438
439 KickstartObject.__init__(self, *args, **kwargs)
440 self.lineno = 0
441
442 def __str__(self):
443 """Return a string formatted for output to a kickstart file."""
444 return ""
445
446 def __call__(self, *args, **kwargs):
447 """Set multiple attributes on a subclass of BaseData at once via
448 keyword arguments. Valid attributes are anything specified in a
449 subclass, but unknown attributes will be ignored.
450 """
451 for (key, val) in kwargs.items():
452 # Ignore setting attributes that were removed in a subclass, as
453 # if they were unknown attributes.
454 if key in self.removedAttrs:
455 continue
456
457 if hasattr(self, key):
458 setattr(self, key, val)
459
460 def deleteRemovedAttrs(self):
461 """Remove all attributes from self that are given in the removedAttrs
462 list. This method should be called from __init__ in a subclass,
463 but only after the superclass's __init__ method has been called.
464 """
465 for attr in filter(lambda k: hasattr(self, k), self.removedAttrs):
466 delattr(self, attr)