1 # -*- coding: utf-8 -*-
3 # Copyright 2012 GRNET S.A. All rights reserved.
5 # Redistribution and use in source and binary forms, with or
6 # without modification, are permitted provided that the following
9 # 1. Redistributions of source code must retain the above
10 # copyright notice, this list of conditions and the following
13 # 2. Redistributions in binary form must reproduce the above
14 # copyright notice, this list of conditions and the following
15 # disclaimer in the documentation and/or other materials
16 # provided with the distribution.
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19 # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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34 # or implied, of GRNET S.A.
36 """This package provides various classes for preparing different Operating
37 Systems for image creation.
40 from image_creator.util import FatalError
44 from collections import namedtuple
45 from functools import wraps
48 def os_cls(distro, osfamily):
49 """Given the distro name and the osfamily, return the appropriate class"""
53 module = __import__("image_creator.os_type.%s" % distro,
54 fromlist=['image_creator.os_type'])
55 classname = distro.capitalize()
57 module = __import__("image_creator.os_type.%s" % osfamily,
58 fromlist=['image_creator.os_type'])
59 classname = osfamily.capitalize()
61 return getattr(module, classname)
64 def add_prefix(target):
65 def wrapper(self, *args):
67 return map(lambda x: prefix + x, target(self, *args))
71 def sysprep(message, enabled=True, **kwargs):
72 """Decorator for system preparation tasks"""
75 func.enabled = enabled
78 for key, val in kwargs.items():
79 setattr(func, key, val)
82 def inner(self, print_message=True):
84 self.out.output(message)
92 def add_sysprep_param(name, descr, maxlen, default=None,
93 validator=lambda x: True):
94 """Decorator for init that adds the definition for a system preparation
100 def inner(self, *args, **kwargs):
102 func(self, *args, **kwargs)
104 if not hasattr(self, 'needed_sysprep_params'):
105 self.needed_sysprep_params = {}
106 getattr(self, 'needed_sysprep_params')[name] = \
107 self.SysprepParam(descr, maxlen, validator)
113 def del_sysprep_param(name):
114 """Decorator for init that deletes a previously added sysprep parameter
120 def inner(self, *args, **kwargs):
121 del self.needed_sysprep_params[nam]
122 func(self, *args, **kwargs)
129 class OSBase(object):
130 """Basic operating system class"""
132 SysprepParam = namedtuple('SysprepParam', 'description maxlen validator')
134 def __init__(self, image, **kargs):
137 self.root = image.root
141 self.sysprep_params = \
142 kargs['sysprep_params'] if 'sysprep_params' in kargs else {}
146 def collect_metadata(self):
147 """Collect metadata about the OS"""
149 if not self.mount(readonly=True):
150 raise FatalError("Unable to mount the media read-only")
152 self.out.output('Collecting image metadata ...', False)
153 self._do_collect_metadata()
154 self.out.success('done')
160 def list_syspreps(self):
161 """Returns a list of sysprep objects"""
162 objs = [getattr(self, name) for name in dir(self)
163 if not name.startswith('_')]
165 return [x for x in objs if self._is_sysprep(x) and x.executed is False]
167 def sysprep_info(self, obj):
168 """Returns information about a sysprep object"""
169 assert self._is_sysprep(obj), "Object is not a sysprep"
171 SysprepInfo = namedtuple("SysprepInfo", "name description")
173 return SysprepInfo(obj.__name__.replace('_', '-'),
174 textwrap.dedent(obj.__doc__))
176 def get_sysprep_by_name(self, name):
177 """Returns the sysprep object with the given name"""
178 error_msg = "Syprep operation %s does not exist for %s" % \
179 (name, self.__class__.__name__)
181 method_name = name.replace('-', '_')
184 method = getattr(self, method_name)
185 except AttributeError:
186 raise FatalError(error_msg)
188 if not self._is_sysprep(method):
189 raise FatalError(error_msg)
193 def enable_sysprep(self, obj):
194 """Enable a system preparation operation"""
195 setattr(obj.im_func, 'enabled', True)
197 def disable_sysprep(self, obj):
198 """Disable a system preparation operation"""
199 setattr(obj.im_func, 'enabled', False)
201 def print_syspreps(self):
202 """Print enabled and disabled system preparation operations."""
204 syspreps = self.list_syspreps()
205 enabled = filter(lambda x: x.enabled, syspreps)
206 disabled = filter(lambda x: not x.enabled, syspreps)
208 wrapper = textwrap.TextWrapper()
209 wrapper.subsequent_indent = '\t'
210 wrapper.initial_indent = '\t'
213 self.out.output("Enabled system preparation operations:")
214 if len(enabled) == 0:
215 self.out.output("(none)")
217 for sysprep in enabled:
218 name = sysprep.__name__.replace('_', '-')
219 descr = wrapper.fill(textwrap.dedent(sysprep.__doc__))
220 self.out.output(' %s:\n%s\n' % (name, descr))
222 self.out.output("Disabled system preparation operations:")
223 if len(disabled) == 0:
224 self.out.output("(none)")
226 for sysprep in disabled:
227 name = sysprep.__name__.replace('_', '-')
228 descr = wrapper.fill(textwrap.dedent(sysprep.__doc__))
229 self.out.output(' %s:\n%s\n' % (name, descr))
231 def print_sysprep_params(self):
232 """Print the system preparation parameter the user may use"""
234 self.out.output("Needed system preparation parameters:")
236 params = self.needed_sysprep_params()
239 self.out.output("(none)")
243 self.out.output("\t%s (%s): %s" %
244 (param.description, param.name,
245 self.sysprep_params[param.name] if param.name in
246 self.sysprep_params else "(none)"))
248 def do_sysprep(self):
249 """Prepare system for image creation."""
252 if not self.mount(readonly=False):
253 raise FatalError("Unable to mount the media read-write")
255 self.out.output('Preparing system for image creation:')
257 tasks = self.list_syspreps()
258 enabled = filter(lambda x: x.enabled, tasks)
264 self.out.output(('(%d/%d)' % (cnt, size)).ljust(7), False)
266 setattr(task.im_func, 'executed', True)
272 def mount(self, readonly=False):
275 if getattr(self, "mounted", False):
278 mount_type = 'read-only' if readonly else 'read-write'
279 self.out.output("Mounting the media %s ..." % mount_type, False)
281 if not self._do_mount(readonly):
285 self.out.success('done')
289 """Umount all mounted filesystems."""
291 self.out.output("Umounting the media ...", False)
294 self.out.success('done')
296 def _is_sysprep(self, obj):
297 """Checks if an object is a sysprep"""
298 return getattr(obj, 'sysprep', False) and callable(obj)
301 def _ls(self, directory):
302 """List the name of all files under a directory"""
303 return self.g.ls(directory)
306 def _find(self, directory):
307 """List the name of all files recursively under a directory"""
308 return self.g.find(directory)
310 def _foreach_file(self, directory, action, **kargs):
311 """Perform an action recursively on all files under a directory.
313 The following options are allowed:
315 * maxdepth: If defined the action will not be performed on
316 files that are below this level of directories under the
319 * ftype: The action will only be performed on files of this
320 type. For a list of all allowed filetypes, see here:
321 http://libguestfs.org/guestfs.3.html#guestfs_readdir
323 * exclude: Exclude all files that follow this pattern.
325 maxdepth = None if 'maxdepth' not in kargs else kargs['maxdepth']
330 maxdepth = None if maxdepth is None else maxdepth - 1
331 kargs['maxdepth'] = maxdepth
333 exclude = None if 'exclude' not in kargs else kargs['exclude']
334 ftype = None if 'ftype' not in kargs else kargs['ftype']
335 has_ftype = lambda x, y: y is None and True or x['ftyp'] == y
337 for f in self.g.readdir(directory):
338 if f['name'] in ('.', '..'):
341 full_path = "%s/%s" % (directory, f['name'])
343 if exclude and re.match(exclude, full_path):
346 if has_ftype(f, 'd'):
347 self._foreach_file(full_path, action, **kargs)
349 if has_ftype(f, ftype):
352 def _do_collect_metadata(self):
353 """helper method for collect_metadata"""
354 self.meta['ROOT_PARTITION'] = "%d" % self.g.part_to_partnum(self.root)
355 self.meta['OSFAMILY'] = self.g.inspect_get_type(self.root)
356 self.meta['OS'] = self.g.inspect_get_distro(self.root)
357 if self.meta['OS'] == "unknown":
358 self.meta['OS'] = self.meta['OSFAMILY']
359 self.meta['DESCRIPTION'] = self.g.inspect_get_product_name(self.root)
361 def _do_mount(self, readonly):
362 """helper method for mount"""
364 self.g.mount_options('ro' if readonly else 'rw', self.root, '/')
365 except RuntimeError as msg:
366 self.out.warn("unable to mount the root partition: %s" % msg)
371 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :