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.
18 # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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):
72 """Decorator for system preparation tasks"""
75 func.enabled = enabled
79 def wrapper2(self, print_message=True):
81 self.out.output(message)
90 """Basic operating system class"""
92 SysprepParam = namedtuple('SysprepParam',
93 'name description length validator')
95 def __init__(self, image, **kargs):
98 self.root = image.root
102 self.sysprep_params = \
103 kargs['sysprep_params'] if 'sysprep_params' in kargs else {}
107 def collect_metadata(self):
108 """Collect metadata about the OS"""
110 if not self.mount(readonly=True):
111 raise FatalError("Unable to mount the media read-only")
113 self.out.output('Collecting image metadata ...', False)
114 self._do_collect_metadata()
115 self.out.success('done')
121 def needed_sysprep_params(self):
122 """Returns a list of needed sysprep parameters. Each element in the
123 list is a SysprepParam object.
127 def list_syspreps(self):
128 """Returns a list of sysprep objects"""
129 objs = [getattr(self, name) for name in dir(self)
130 if not name.startswith('_')]
132 return [x for x in objs if self._is_sysprep(x) and x.executed is False]
134 def sysprep_info(self, obj):
135 """Returns information about a sysprep object"""
136 assert self._is_sysprep(obj), "Object is not a sysprep"
138 return (obj.__name__.replace('_', '-'), textwrap.dedent(obj.__doc__))
140 def get_sysprep_by_name(self, name):
141 """Returns the sysprep object with the given name"""
142 error_msg = "Syprep operation %s does not exist for %s" % \
143 (name, self.__class__.__name__)
145 method_name = name.replace('-', '_')
148 method = getattr(self, method_name)
149 except AttributeError:
150 raise FatalError(error_msg)
152 if not self._is_sysprep(method):
153 raise FatalError(error_msg)
157 def enable_sysprep(self, obj):
158 """Enable a system preparation operation"""
159 setattr(obj.im_func, 'enabled', True)
161 def disable_sysprep(self, obj):
162 """Disable a system preparation operation"""
163 setattr(obj.im_func, 'enabled', False)
165 def print_syspreps(self):
166 """Print enabled and disabled system preparation operations."""
168 syspreps = self.list_syspreps()
169 enabled = filter(lambda x: x.enabled, syspreps)
170 disabled = filter(lambda x: not x.enabled, syspreps)
172 wrapper = textwrap.TextWrapper()
173 wrapper.subsequent_indent = '\t'
174 wrapper.initial_indent = '\t'
177 self.out.output("Enabled system preparation operations:")
178 if len(enabled) == 0:
179 self.out.output("(none)")
181 for sysprep in enabled:
182 name = sysprep.__name__.replace('_', '-')
183 descr = wrapper.fill(textwrap.dedent(sysprep.__doc__))
184 self.out.output(' %s:\n%s\n' % (name, descr))
186 self.out.output("Disabled system preparation operations:")
187 if len(disabled) == 0:
188 self.out.output("(none)")
190 for sysprep in disabled:
191 name = sysprep.__name__.replace('_', '-')
192 descr = wrapper.fill(textwrap.dedent(sysprep.__doc__))
193 self.out.output(' %s:\n%s\n' % (name, descr))
195 def print_sysprep_params(self):
196 """Print the system preparation parameter the user may use"""
198 self.out.output("Needed system preparation parameters:")
200 params = self.needed_sysprep_params()
203 self.out.output("(none)")
207 self.out.output("\t%s (%s): %s" %
208 (param.description, param.name,
209 self.sysprep_params[param.name] if param.name in
210 self.sysprep_params else "(none)"))
212 def do_sysprep(self):
213 """Prepare system for image creation."""
216 if not self.mount(readonly=False):
217 raise FatalError("Unable to mount the media read-write")
219 self.out.output('Preparing system for image creation:')
221 tasks = self.list_syspreps()
222 enabled = filter(lambda x: x.enabled, tasks)
228 self.out.output(('(%d/%d)' % (cnt, size)).ljust(7), False)
230 setattr(task.im_func, 'executed', True)
236 def mount(self, readonly=False):
239 if getattr(self, "mounted", False):
242 mount_type = 'read-only' if readonly else 'read-write'
243 self.out.output("Mounting the media %s ..." % mount_type, False)
245 if not self._do_mount(readonly):
249 self.out.success('done')
253 """Umount all mounted filesystems."""
255 self.out.output("Umounting the media ...", False)
258 self.out.success('done')
260 def _is_sysprep(self, obj):
261 """Checks if an object is a sysprep"""
262 return getattr(obj, 'sysprep', False) and callable(obj)
265 def _ls(self, directory):
266 """List the name of all files under a directory"""
267 return self.g.ls(directory)
270 def _find(self, directory):
271 """List the name of all files recursively under a directory"""
272 return self.g.find(directory)
274 def _foreach_file(self, directory, action, **kargs):
275 """Perform an action recursively on all files under a directory.
277 The following options are allowed:
279 * maxdepth: If defined the action will not be performed on
280 files that are below this level of directories under the
283 * ftype: The action will only be performed on files of this
284 type. For a list of all allowed filetypes, see here:
285 http://libguestfs.org/guestfs.3.html#guestfs_readdir
287 * exclude: Exclude all files that follow this pattern.
289 maxdepth = None if 'maxdepth' not in kargs else kargs['maxdepth']
294 maxdepth = None if maxdepth is None else maxdepth - 1
295 kargs['maxdepth'] = maxdepth
297 exclude = None if 'exclude' not in kargs else kargs['exclude']
298 ftype = None if 'ftype' not in kargs else kargs['ftype']
299 has_ftype = lambda x, y: y is None and True or x['ftyp'] == y
301 for f in self.g.readdir(directory):
302 if f['name'] in ('.', '..'):
305 full_path = "%s/%s" % (directory, f['name'])
307 if exclude and re.match(exclude, full_path):
310 if has_ftype(f, 'd'):
311 self._foreach_file(full_path, action, **kargs)
313 if has_ftype(f, ftype):
316 def _do_collect_metadata(self):
317 """helper method for collect_metadata"""
318 self.meta['ROOT_PARTITION'] = "%d" % self.g.part_to_partnum(self.root)
319 self.meta['OSFAMILY'] = self.g.inspect_get_type(self.root)
320 self.meta['OS'] = self.g.inspect_get_distro(self.root)
321 if self.meta['OS'] == "unknown":
322 self.meta['OS'] = self.meta['OSFAMILY']
323 self.meta['DESCRIPTION'] = self.g.inspect_get_product_name(self.root)
325 def _do_mount(self, readonly):
326 """helper method for mount"""
328 self.g.mount_options('ro' if readonly else 'rw', self.root, '/')
329 except RuntimeError as msg:
330 self.out.warn("unable to mount the root partition: %s" % msg)
335 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :