common/migration.py
author sylvain.thenault@logilab.fr
Tue, 20 Jan 2009 16:29:06 +0100
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child 676 270eb87a768a
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pylint fixes
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"""utility to ease migration of application version to newly installed
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version
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:organization: Logilab
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:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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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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from tempfile import mktemp
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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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def migration_files(config, toupgrade):
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    """return an orderer list of path of scripts to execute to upgrade
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    an installed application according to installed cube and cubicweb versions
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    """
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    merged = []
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    for cube, fromversion, toversion in toupgrade:
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        if cube == 'cubicweb':
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            migrdir = config.migration_scripts_dir()
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        else:
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            migrdir = config.cube_migration_scripts_dir(cube)
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        scripts = filter_scripts(config, migrdir, fromversion, toversion)
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        merged += [s[1] for s in scripts]
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    if config.accept_mode('Any'):
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        migrdir = config.migration_scripts_dir()
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        merged.insert(0, join(migrdir, 'bootstrapmigration_repository.py'))
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    return merged
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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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        confirm = raw_input('** execute %r (Y/n/s[how]) ?' % scriptpath)
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        confirm = confirm.strip().lower()
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        if confirm in ('n', 'no'):
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            return False
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        elif confirm in ('s', '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 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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   136
            # monkey path configuration.accept_mode so database mode (e.g. Any)
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   137
            # won't be accepted
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   138
            orig_accept_mode = self.config.accept_mode
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parents:
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   139
            def accept_mode(mode):
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   140
                if mode == 'Any':
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   141
                    return False
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parents:
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   142
                return orig_accept_mode(mode)
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parents:
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   143
            self.config.accept_mode = accept_mode
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   144
        scripts = migration_files(self.config, toupgrade)
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parents:
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   145
        if scripts:
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   146
            vmap = dict( (pname, (fromver, tover)) for pname, fromver, tover in toupgrade)
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   147
            self.__context.update({'applcubicwebversion': vcconf['cubicweb'],
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   148
                                   'cubicwebversion': self.config.cubicweb_version(),
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   149
                                   'versions_map': vmap})
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   150
            self.scripts_session(scripts)
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parents:
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   151
        else:
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   152
            print 'no migration script to execute'            
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parents:
diff changeset
   153
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   154
    def shutdown(self):
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   155
        pass
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parents:
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   156
    
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   157
    def __getattribute__(self, name):
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   158
        try:
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   159
            return object.__getattribute__(self, name)
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diff changeset
   160
        except AttributeError:
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   161
            cmd = 'cmd_%s' % name
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parents:
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   162
            if hasattr(self, cmd):
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   163
                meth = getattr(self, cmd) 
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diff changeset
   164
                return lambda *args, **kwargs: self.interact(args, kwargs,
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parents:
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   165
                                                             meth=meth)
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parents:
diff changeset
   166
            raise
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diff changeset
   167
        raise AttributeError(name)
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parents:
diff changeset
   168
            
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diff changeset
   169
    def interact(self, args, kwargs, meth):
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   170
        """execute the given method according to user's confirmation"""
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diff changeset
   171
        msg = 'execute command: %s(%s) ?' % (
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parents:
diff changeset
   172
            meth.__name__[4:],
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parents:
diff changeset
   173
            ', '.join([repr(arg) for arg in args] +
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parents:
diff changeset
   174
                      ['%s=%r' % (n,v) for n,v in kwargs.items()]))
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parents:
diff changeset
   175
        if 'ask_confirm' in kwargs:
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parents:
diff changeset
   176
            ask_confirm = kwargs.pop('ask_confirm')
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parents:
diff changeset
   177
        else:
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parents:
diff changeset
   178
            ask_confirm = True
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parents:
diff changeset
   179
        if not ask_confirm or self.confirm(msg):
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parents:
diff changeset
   180
            return meth(*args, **kwargs)
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parents:
diff changeset
   181
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diff changeset
   182
    def confirm(self, question, shell=True, abort=True, retry=False):
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parents:
diff changeset
   183
        """ask for confirmation and return true on positive answer
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parents:
diff changeset
   184
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diff changeset
   185
        if `retry` is true the r[etry] answer may return 2
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parents:
diff changeset
   186
        """
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parents:
diff changeset
   187
        print question,
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parents:
diff changeset
   188
        possibleanswers = 'Y/n'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   189
        if abort:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   190
            possibleanswers += '/a[bort]'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   191
        if shell:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   192
            possibleanswers += '/s[hell]'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   193
        if retry:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   194
            possibleanswers += '/r[etry]'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   195
        try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   196
            confirm = raw_input('(%s): ' % ( possibleanswers, ))
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   197
            answer = confirm.strip().lower()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   198
        except (EOFError, KeyboardInterrupt):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   199
            answer = 'abort'
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   200
        if answer in ('n', 'no'):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   201
            return False
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   202
        if answer in ('r', 'retry'):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   203
            return 2
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   204
        if answer in ('a', 'abort'):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   205
            self.rollback()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   206
            raise SystemExit(1)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   207
        if shell and answer in ('s', 'shell'):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   208
            self.interactive_shell()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   209
            return self.confirm(question)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   210
        return True
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   211
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   212
    def interactive_shell(self):
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parents:
diff changeset
   213
        self.confirm = yes
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   214
        self.need_wrap = False
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   215
        # avoid '_' to be added to builtins by sys.display_hook
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parents:
diff changeset
   216
        def do_not_add___to_builtins(obj):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   217
            if obj is not None:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   218
                print repr(obj)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   219
        sys.displayhook = do_not_add___to_builtins
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   220
        local_ctx = self._create_context()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   221
        try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   222
            import readline
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   223
            from rlcompleter import Completer
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   224
        except ImportError:
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   225
            # readline not available
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parents:
diff changeset
   226
            pass
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   227
        else:        
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   228
            readline.set_completer(Completer(local_ctx).complete)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   229
            readline.parse_and_bind('tab: complete')
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   230
            histfile = os.path.join(os.environ["HOME"], ".eshellhist")
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   231
            try:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   232
                readline.read_history_file(histfile)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   233
            except IOError:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   234
                pass
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   235
        from code import interact
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   236
        banner = """entering the migration python shell
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   237
just type migration commands or arbitrary python code and type ENTER to execute it
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   238
type "exit" or Ctrl-D to quit the shell and resume operation"""
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   239
        # give custom readfunc to avoid http://bugs.python.org/issue1288615
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   240
        def unicode_raw_input(prompt):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   241
            return unicode(raw_input(prompt), sys.stdin.encoding)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   242
        interact(banner, readfunc=unicode_raw_input, local=local_ctx)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   243
        readline.write_history_file(histfile)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   244
        # delete instance's confirm attribute to avoid questions
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   245
        del self.confirm
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   246
        self.need_wrap = True
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   247
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   248
    @cached
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   249
    def _create_context(self):
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parents:
diff changeset
   250
        """return a dictionary to use as migration script execution context"""
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   251
        context = self.__context
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   252
        for attr in dir(self):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   253
            if attr.startswith('cmd_'):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   254
                if self.need_wrap:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   255
                    context[attr[4:]] = getattr(self, attr[4:])
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   256
                else:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   257
                    context[attr[4:]] = getattr(self, attr)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   258
        return context
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   259
    
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   260
    def process_script(self, migrscript, funcname=None, *args, **kwargs):
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   261
        """execute a migration script
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   262
        in interactive mode,  display the migration script path, ask for
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   263
        confirmation and execute it if confirmed
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   264
        """
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   265
        assert migrscript.endswith('.py'), migrscript
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   266
        if self.execscript_confirm(migrscript):
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   267
            scriptlocals = self._create_context().copy()
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   268
            if funcname is None:
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   269
                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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   283
                    
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    def scripts_session(self, migrscripts):
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        """execute some scripts in a transaction"""
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        try:
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            for migrscript in migrscripts:
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                self.process_script(migrscript)
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            self.commit()
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        except:
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            self.rollback()
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            raise
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   293
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   294
    def cmd_option_renamed(self, oldname, newname):
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        """a configuration option has been renamed"""
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   296
        self._option_changes.append(('renamed', oldname, newname))
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   297
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   298
    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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   300
        self._option_changes.append(('moved', option, oldgroup, newgroup))
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   301
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    def cmd_option_added(self, optname):
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   303
        """a configuration option has been added"""
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   304
        self._option_changes.append(('added', optname))
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   305
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   306
    def cmd_option_removed(self, optname):
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   307
        """a configuration option has been removed"""
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   308
        # can safely be ignored
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   309
        #self._option_changes.append(('removed', optname))
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   310
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   311
    def cmd_option_type_changed(self, optname, oldtype, newvalue):
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   312
        """a configuration option's type has changed"""
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   313
        self._option_changes.append(('typechanged', optname, oldtype, newvalue))
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   314
        
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   315
    def cmd_add_cube(self, cube):
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   316
        origcubes = self.config.cubes()
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   317
        newcubes = [p for p in self.config.expand_cubes([cube]) 
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   318
                       if not p in origcubes]
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diff changeset
   319
        if newcubes:
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   320
            assert cube in newcubes
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diff changeset
   321
            self.config.add_cubes(newcubes)
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diff changeset
   322
        return newcubes
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diff changeset
   323
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   324
    def cmd_remove_cube(self, cube):
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diff changeset
   325
        origcubes = self.config._cubes
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diff changeset
   326
        basecubes = list(origcubes)
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diff changeset
   327
        for pkg in self.config.expand_cubes([cube]):
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diff changeset
   328
            try:
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   329
                basecubes.remove(pkg)
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diff changeset
   330
            except ValueError:
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diff changeset
   331
                continue
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diff changeset
   332
        self.config._cubes = tuple(self.config.expand_cubes(basecubes))
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diff changeset
   333
        removed = [p for p in origcubes if not p in self.config._cubes]
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parents:
diff changeset
   334
        assert cube in removed, \
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diff changeset
   335
               "can't remove cube %s, used as a dependancy" % cube
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diff changeset
   336
        return removed
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parents:
diff changeset
   337
    
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   338
    def rewrite_configuration(self):
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diff changeset
   339
        # import locally, show_diffs unavailable in gae environment
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diff changeset
   340
        from cubicweb.toolsutils import show_diffs
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diff changeset
   341
        configfile = self.config.main_config_file()
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diff changeset
   342
        if self._option_changes:
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diff changeset
   343
            read_old_config(self.config, self._option_changes, configfile)
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diff changeset
   344
        newconfig = mktemp()
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diff changeset
   345
        for optdescr in self._option_changes:
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parents:
diff changeset
   346
            if optdescr[0] == 'added':
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diff changeset
   347
                optdict = self.config.get_option_def(optdescr[1])
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diff changeset
   348
                if optdict.get('default') is REQUIRED:
447
0e52d72104a6 pylint fixes
sylvain.thenault@logilab.fr
parents: 0
diff changeset
   349
                    self.config.input_option(optdescr[1], optdict)
0
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parents:
diff changeset
   350
        self.config.generate_config(open(newconfig, 'w'))
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parents:
diff changeset
   351
        show_diffs(configfile, newconfig)
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parents:
diff changeset
   352
        if exists(newconfig):
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parents:
diff changeset
   353
            os.unlink(newconfig)
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parents:
diff changeset
   354
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parents:
diff changeset
   355
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parents:
diff changeset
   356
from logging import getLogger
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parents:
diff changeset
   357
from cubicweb import set_log_methods
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parents:
diff changeset
   358
set_log_methods(MigrationHelper, getLogger('cubicweb.migration'))