common/migration.py
author Nicolas Chauvat <nicolas.chauvat@logilab.fr>
Tue, 11 Aug 2009 12:42:01 +0200
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child 2897 2658f432284c
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"""utilities for instances migration
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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import sys
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import os
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import logging
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import tempfile
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from os.path import exists, join, basename, splitext
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from logilab.common.decorators import cached
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from logilab.common.configuration import REQUIRED, read_old_config
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from logilab.common.shellutils import ASK
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from cubicweb import ConfigurationError
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def filter_scripts(config, directory, fromversion, toversion, quiet=True):
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    """return a list of paths of migration files to consider to upgrade
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    from a version to a greater one
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    """
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    from logilab.common.changelog import Version # doesn't work with appengine
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    assert fromversion
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    assert toversion
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    assert isinstance(fromversion, tuple), fromversion.__class__
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    assert isinstance(toversion, tuple), toversion.__class__
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    assert fromversion <= toversion, (fromversion, toversion)
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    if not exists(directory):
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        if not quiet:
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            print directory, "doesn't exists, no migration path"
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        return []
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    if fromversion == toversion:
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        return []
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    result = []
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    for fname in os.listdir(directory):
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        if fname.endswith('.pyc') or fname.endswith('.pyo') \
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               or fname.endswith('~'):
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            continue
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        fpath = join(directory, fname)
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        try:
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            tver, mode = fname.split('_', 1)
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        except ValueError:
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            continue
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        mode = mode.split('.', 1)[0]
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        if not config.accept_mode(mode):
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            continue
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        try:
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            tver = Version(tver)
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        except ValueError:
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            continue
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        if tver <= fromversion:
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            continue
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        if tver > toversion:
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            continue
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        result.append((tver, fpath))
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    # be sure scripts are executed in order
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    return sorted(result)
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IGNORED_EXTENSIONS = ('.swp', '~')
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def execscript_confirm(scriptpath):
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    """asks for confirmation before executing a script and provides the
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    ability to show the script's content
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    """
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    while True:
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        answer = ASK.ask('Execute %r ?' % scriptpath, ('Y','n','show'), 'Y')
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        if answer == 'n':
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            return False
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        elif answer == 'show':
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            stream = open(scriptpath)
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            scriptcontent = stream.read()
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            stream.close()
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            print
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            print scriptcontent
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            print
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        else:
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            return True
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def yes(*args, **kwargs):
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    return True
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class MigrationHelper(object):
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    """class holding CubicWeb Migration Actions used by migration scripts"""
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    def __init__(self, config, interactive=True, verbosity=1):
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        self.config = config
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        self.config.init_log(logthreshold=logging.ERROR, debug=True)
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        # 0: no confirmation, 1: only main commands confirmed, 2 ask for everything
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        self.verbosity = verbosity
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        self.need_wrap = True
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        if not interactive or not verbosity:
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            self.confirm = yes
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            self.execscript_confirm = yes
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        else:
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            self.execscript_confirm = execscript_confirm
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        self._option_changes = []
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        self.__context = {'confirm': self.confirm,
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                          'config': self.config,
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                          'interactive_mode': interactive,
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                          }
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    def __getattribute__(self, name):
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        try:
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            return object.__getattribute__(self, name)
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        except AttributeError:
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            cmd = 'cmd_%s' % name
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            if hasattr(self, cmd):
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                meth = getattr(self, cmd)
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                return lambda *args, **kwargs: self.interact(args, kwargs,
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                                                             meth=meth)
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            raise
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        raise AttributeError(name)
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0
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    def repo_connect(self):
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        return self.config.repository()
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    def migrate(self, vcconf, toupgrade, options):
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        """upgrade the given set of cubes
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        `cubes` is an ordered list of 3-uple:
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        (cube, fromversion, toversion)
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        """
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        if options.fs_only:
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            # monkey path configuration.accept_mode so database mode (e.g. Any)
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            # won't be accepted
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            orig_accept_mode = self.config.accept_mode
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            def accept_mode(mode):
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                if mode == 'Any':
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                    return False
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                return orig_accept_mode(mode)
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            self.config.accept_mode = accept_mode
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        # may be an iterator
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        toupgrade = tuple(toupgrade)
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        vmap = dict( (cube, (fromver, tover)) for cube, fromver, tover in toupgrade)
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        ctx = self.__context
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        ctx['versions_map'] = vmap
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        if self.config.accept_mode('Any') and 'cubicweb' in vmap:
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            migrdir = self.config.migration_scripts_dir()
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            self.process_script(join(migrdir, 'bootstrapmigration_repository.py'))
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        for cube, fromversion, toversion in toupgrade:
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            if cube == 'cubicweb':
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                migrdir = self.config.migration_scripts_dir()
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            else:
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                migrdir = self.config.cube_migration_scripts_dir(cube)
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            scripts = filter_scripts(self.config, migrdir, fromversion, toversion)
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            if scripts:
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                prevversion = None
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                for version, script in scripts:
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                    # take care to X.Y.Z_Any.py / X.Y.Z_common.py: we've to call
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                    # cube_upgraded once all script of X.Y.Z have been executed
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                    if prevversion is not None and version != prevversion:
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                        self.cube_upgraded(cube, version)
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                    prevversion = version
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                    self.process_script(script)
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                self.cube_upgraded(cube, toversion)
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            else:
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                self.cube_upgraded(cube, toversion)
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   166
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    def cube_upgraded(self, cube, version):
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        pass
0
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    def shutdown(self):
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        pass
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0
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    def interact(self, args, kwargs, meth):
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        """execute the given method according to user's confirmation"""
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        msg = 'Execute command: %s(%s) ?' % (
0
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            meth.__name__[4:],
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            ', '.join([repr(arg) for arg in args] +
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                      ['%s=%r' % (n,v) for n,v in kwargs.items()]))
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        if 'ask_confirm' in kwargs:
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            ask_confirm = kwargs.pop('ask_confirm')
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        else:
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            ask_confirm = True
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        if not ask_confirm or self.confirm(msg):
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            return meth(*args, **kwargs)
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    def confirm(self, question, shell=True, abort=True, retry=False, default='y'):
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        """ask for confirmation and return true on positive answer
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        if `retry` is true the r[etry] answer may return 2
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        """
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        possibleanswers = ['y','n']
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        if abort:
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            possibleanswers.append('abort')
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        if shell:
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            possibleanswers.append('shell')
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        if retry:
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            possibleanswers.append('retry')
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        try:
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            answer = ASK.ask(question, possibleanswers, default)
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        except (EOFError, KeyboardInterrupt):
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            answer = 'abort'
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        if answer == 'n':
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            return False
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        if answer == 'retry':
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            return 2
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        if answer == 'abort':
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            raise SystemExit(1)
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        if shell and answer == 'shell':
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            self.interactive_shell()
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            return self.confirm(question)
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        return True
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    def interactive_shell(self):
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        self.confirm = yes
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        self.need_wrap = False
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        # avoid '_' to be added to builtins by sys.display_hook
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        def do_not_add___to_builtins(obj):
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            if obj is not None:
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                print repr(obj)
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        sys.displayhook = do_not_add___to_builtins
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        local_ctx = self._create_context()
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        try:
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            import readline
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            from rlcompleter import Completer
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        except ImportError:
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            # readline not available
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            pass
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        else:
0
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            readline.set_completer(Completer(local_ctx).complete)
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            readline.parse_and_bind('tab: complete')
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            histfile = os.path.join(os.environ["HOME"], ".eshellhist")
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            try:
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                readline.read_history_file(histfile)
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            except IOError:
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                pass
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        from code import interact
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        banner = """entering the migration python shell
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just type migration commands or arbitrary python code and type ENTER to execute it
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type "exit" or Ctrl-D to quit the shell and resume operation"""
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        # give custom readfunc to avoid http://bugs.python.org/issue1288615
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        def unicode_raw_input(prompt):
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            return unicode(raw_input(prompt), sys.stdin.encoding)
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        interact(banner, readfunc=unicode_raw_input, local=local_ctx)
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   244
        readline.write_history_file(histfile)
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   245
        # delete instance's confirm attribute to avoid questions
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   246
        del self.confirm
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   247
        self.need_wrap = True
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    @cached
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    def _create_context(self):
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        """return a dictionary to use as migration script execution context"""
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        context = self.__context
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        for attr in dir(self):
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            if attr.startswith('cmd_'):
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                if self.need_wrap:
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                    context[attr[4:]] = getattr(self, attr[4:])
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                else:
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                    context[attr[4:]] = getattr(self, attr)
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        return context
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0
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    def process_script(self, migrscript, funcname=None, *args, **kwargs):
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        """execute a migration script
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        in interactive mode,  display the migration script path, ask for
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        confirmation and execute it if confirmed
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        """
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        assert migrscript.endswith('.py'), migrscript
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        if self.execscript_confirm(migrscript):
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            scriptlocals = self._create_context().copy()
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            if funcname is None:
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                pyname = '__main__'
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            else:
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                pyname = splitext(basename(migrscript))[0]
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            scriptlocals.update({'__file__': migrscript, '__name__': pyname})
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            execfile(migrscript, scriptlocals)
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            if funcname is not None:
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                try:
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                    func = scriptlocals[funcname]
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                    self.info('found %s in locals', funcname)
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                    assert callable(func), '%s (%s) is not callable' % (func, funcname)
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                except KeyError:
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                    self.critical('no %s in script %s', funcname, migrscript)
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                    return None
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                return func(*args, **kwargs)
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0
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    def cmd_option_renamed(self, oldname, newname):
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        """a configuration option has been renamed"""
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        self._option_changes.append(('renamed', oldname, newname))
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    def cmd_option_group_change(self, option, oldgroup, newgroup):
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        """a configuration option has been moved in another group"""
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        self._option_changes.append(('moved', option, oldgroup, newgroup))
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    def cmd_option_added(self, optname):
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        """a configuration option has been added"""
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        self._option_changes.append(('added', optname))
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    def cmd_option_removed(self, optname):
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        """a configuration option has been removed"""
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        # can safely be ignored
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        #self._option_changes.append(('removed', optname))
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    def cmd_option_type_changed(self, optname, oldtype, newvalue):
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        """a configuration option's type has changed"""
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        self._option_changes.append(('typechanged', optname, oldtype, newvalue))
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    def cmd_add_cubes(self, cubes):
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        """modify the list of used cubes in the in-memory config
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        returns newly inserted cubes, including dependencies
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        """
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        if isinstance(cubes, basestring):
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            cubes = (cubes,)
0
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        origcubes = self.config.cubes()
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        newcubes = [p for p in self.config.expand_cubes(cubes)
0
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                       if not p in origcubes]
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        if newcubes:
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            for cube in cubes:
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                assert cube in newcubes
0
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            self.config.add_cubes(newcubes)
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        return newcubes
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    def cmd_remove_cube(self, cube, removedeps=False):
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        if removedeps:
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            toremove = self.config.expand_cubes([cube])
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        else:
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            toremove = (cube,)
0
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        origcubes = self.config._cubes
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        basecubes = [c for c in origcubes if not c in toremove]
0
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        self.config._cubes = tuple(self.config.expand_cubes(basecubes))
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        removed = [p for p in origcubes if not p in self.config._cubes]
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        if not cube in removed:
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            raise ConfigurationError("can't remove cube %s, "
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                                     "used as a dependency" % cube)
0
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        return removed
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0
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    def rewrite_configuration(self):
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        # import locally, show_diffs unavailable in gae environment
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   337
        from cubicweb.toolsutils import show_diffs
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   338
        configfile = self.config.main_config_file()
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        if self._option_changes:
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            read_old_config(self.config, self._option_changes, configfile)
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        _, newconfig = tempfile.mkstemp()
0
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   342
        for optdescr in self._option_changes:
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            if optdescr[0] == 'added':
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                optdict = self.config.get_option_def(optdescr[1])
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                if optdict.get('default') is REQUIRED:
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                    self.config.input_option(optdescr[1], optdict)
0
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        self.config.generate_config(open(newconfig, 'w'))
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        show_diffs(configfile, newconfig)
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        if exists(newconfig):
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            os.unlink(newconfig)
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   353
from logging import getLogger
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   354
from cubicweb import set_log_methods
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set_log_methods(MigrationHelper, getLogger('cubicweb.migration'))