X-Git-Url: https://code.grnet.gr/git/snf-image-creator/blobdiff_plain/dcf9274b9589ba4380412e49c8cbc2dccabd4b83..6f391961317833dba163eb4cda1685264e1a1de5:/image_creator/os_type/__init__.py diff --git a/image_creator/os_type/__init__.py b/image_creator/os_type/__init__.py index c0fa505..cc7d39a 100644 --- a/image_creator/os_type/__init__.py +++ b/image_creator/os_type/__init__.py @@ -1,3 +1,5 @@ +# -*- coding: utf-8 -*- +# # Copyright 2012 GRNET S.A. All rights reserved. # # Redistribution and use in source and binary forms, with or @@ -31,13 +33,20 @@ # interpreted as representing official policies, either expressed # or implied, of GRNET S.A. +"""This package provides various classes for preparing different Operating +Systems for image creation. +""" + from image_creator.util import FatalError import textwrap import re +from collections import namedtuple +from functools import wraps def os_cls(distro, osfamily): + """Given the distro name and the osfamily, return the appropriate class""" module = None classname = None try: @@ -53,49 +62,118 @@ def os_cls(distro, osfamily): def add_prefix(target): + """Decorator that adds a prefix to the result of a function""" def wrapper(self, *args): prefix = args[0] - return map(lambda x: prefix + x, target(self, *args)) + return [prefix + path for path in target(self, *args)] + return wrapper + + +def sysprep(message, enabled=True, **kwargs): + """Decorator for system preparation tasks""" + def wrapper(method): + method.sysprep = True + method.enabled = enabled + method.executed = False + + for key, val in kwargs.items(): + setattr(method, key, val) + + @wraps(method) + def inner(self, print_message=True): + if print_message: + self.out.output(message) + return method(self) + + return inner return wrapper -def sysprep(enabled=True): +def add_sysprep_param(name, type, default, descr, validate=lambda x: True): + """Decorator for __init__ that adds the definition for a system preparation + parameter in an instance of a os_type class + """ + def wrapper(init): + @wraps(init) + def inner(self, *args, **kwargs): + init(self, *args, **kwargs) + self.needed_sysprep_params[name] = \ + self.SysprepParam(type, default, descr, validate) + if default is not None: + self.sysprep_params[name] = default + return inner + return wrapper + + +def del_sysprep_param(name): + """Decorator for __init__ that deletes a previously added sysprep parameter + definition from an instance of a os_type class. + """ def wrapper(func): - func.sysprep = True - func.enabled = enabled - return func + @wraps(func) + def inner(self, *args, **kwargs): + del self.needed_sysprep_params[name] + func(self, *args, **kwargs) + return inner return wrapper class OSBase(object): """Basic operating system class""" - def __init__(self, rootdev, ghandler, output): - self.root = rootdev - self.g = ghandler - self.out = output + SysprepParam = namedtuple('SysprepParam', + ['type', 'default', 'description', 'validate']) + + def __init__(self, image, **kargs): + self.image = image + + self.root = image.root + self.g = image.g + self.out = image.out + + self.needed_sysprep_params = {} + self.sysprep_params = \ + kargs['sysprep_params'] if 'sysprep_params' in kargs else {} - # Collect metadata about the OS self.meta = {} - self.meta['ROOT_PARTITION'] = "%d" % self.g.part_to_partnum(self.root) - self.meta['OSFAMILY'] = self.g.inspect_get_type(self.root) - self.meta['OS'] = self.g.inspect_get_distro(self.root) - self.meta['DESCRIPTION'] = self.g.inspect_get_product_name(self.root) + self.mounted = False - def _is_sysprep(self, obj): - return getattr(obj, 'sysprep', False) and callable(obj) + # Many guestfs compilations don't support scrub + self._scrub_support = True + try: + self.g.available(['scrub']) + except RuntimeError: + self._scrub_support = False - def list_syspreps(self): + def collect_metadata(self): + """Collect metadata about the OS""" + try: + if not self.mount(readonly=True): + raise FatalError("Unable to mount the media read-only") + + self.out.output('Collecting image metadata ...', False) + self._do_collect_metadata() + self.out.success('done') + finally: + self.umount() + self.out.output() + + def list_syspreps(self): + """Returns a list of sysprep objects""" objs = [getattr(self, name) for name in dir(self) if not name.startswith('_')] - return [x for x in objs if self._is_sysprep(x)] + return [x for x in objs if self._is_sysprep(x) and x.executed is False] def sysprep_info(self, obj): + """Returns information about a sysprep object""" assert self._is_sysprep(obj), "Object is not a sysprep" - return (obj.__name__.replace('_', '-'), textwrap.dedent(obj.__doc__)) + SysprepInfo = namedtuple("SysprepInfo", "name description") + + return SysprepInfo(obj.__name__.replace('_', '-'), + textwrap.dedent(obj.__doc__)) def get_sysprep_by_name(self, name): """Returns the sysprep object with the given name""" @@ -126,8 +204,8 @@ class OSBase(object): """Print enabled and disabled system preparation operations.""" syspreps = self.list_syspreps() - enabled = filter(lambda x: x.enabled, syspreps) - disabled = filter(lambda x: not x.enabled, syspreps) + enabled = [sysprep for sysprep in syspreps if sysprep.enabled] + disabled = [sysprep for sysprep in syspreps if not sysprep.enabled] wrapper = textwrap.TextWrapper() wrapper.subsequent_indent = '\t' @@ -152,17 +230,83 @@ class OSBase(object): descr = wrapper.fill(textwrap.dedent(sysprep.__doc__)) self.out.output(' %s:\n%s\n' % (name, descr)) + def print_sysprep_params(self): + """Print the system preparation parameter the user may use""" + + self.out.output("Needed system preparation parameters:") + + if len(self.needed_sysprep_params) == 0: + self.out.output("(none)") + return + + for name, param in self.needed_sysprep_params.items(): + self.out.output("\t%s (%s): %s" % + (param.description, name, + self.sysprep_params[name] if name in + self.sysprep_params else "(none)")) + + def do_sysprep(self): + """Prepare system for image creation.""" + + try: + if not self.mount(readonly=False): + raise FatalError("Unable to mount the media read-write") + + self.out.output('Preparing system for image creation:') + + enabled = [task for task in self.list_syspreps() if task.enabled] + + size = len(enabled) + cnt = 0 + for task in enabled: + cnt += 1 + self.out.output(('(%d/%d)' % (cnt, size)).ljust(7), False) + task() + setattr(task.im_func, 'executed', True) + finally: + self.umount() + + self.out.output() + + def mount(self, readonly=False): + """Mount image.""" + + if getattr(self, "mounted", False): + return True + + mount_type = 'read-only' if readonly else 'read-write' + self.out.output("Mounting the media %s ..." % mount_type, False) + + if not self._do_mount(readonly): + return False + + self.mounted = True + self.out.success('done') + return True + + def umount(self): + """Umount all mounted filesystems.""" + + self.out.output("Umounting the media ...", False) + self.g.umount_all() + self.mounted = False + self.out.success('done') + + def _is_sysprep(self, obj): + """Checks if an object is a sysprep""" + return getattr(obj, 'sysprep', False) and callable(obj) + @add_prefix - def ls(self, directory): + def _ls(self, directory): """List the name of all files under a directory""" return self.g.ls(directory) @add_prefix - def find(self, directory): + def _find(self, directory): """List the name of all files recursively under a directory""" return self.g.find(directory) - def foreach_file(self, directory, action, **kargs): + def _foreach_file(self, directory, action, **kargs): """Perform an action recursively on all files under a directory. The following options are allowed: @@ -199,25 +343,28 @@ class OSBase(object): continue if has_ftype(f, 'd'): - self.foreach_file(full_path, action, **kargs) + self._foreach_file(full_path, action, **kargs) if has_ftype(f, ftype): action(full_path) - def do_sysprep(self): - """Prepere system for image creation.""" - - self.out.output('Preparing system for image creation:') + def _do_collect_metadata(self): + """helper method for collect_metadata""" + self.meta['ROOT_PARTITION'] = "%d" % self.g.part_to_partnum(self.root) + self.meta['OSFAMILY'] = self.g.inspect_get_type(self.root) + self.meta['OS'] = self.g.inspect_get_distro(self.root) + if self.meta['OS'] == "unknown": + self.meta['OS'] = self.meta['OSFAMILY'] + self.meta['DESCRIPTION'] = self.g.inspect_get_product_name(self.root) - tasks = self.list_syspreps() - enabled = filter(lambda x: x.enabled, tasks) + def _do_mount(self, readonly): + """helper method for mount""" + try: + self.g.mount_options('ro' if readonly else 'rw', self.root, '/') + except RuntimeError as msg: + self.out.warn("unable to mount the root partition: %s" % msg) + return False - size = len(enabled) - cnt = 0 - for task in enabled: - cnt += 1 - self.out.output(('(%d/%d)' % (cnt, size)).ljust(7), False) - task() - self.out.output() + return True # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :