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(jelmer) Support upgrading between the 2a and development-colo formats.
 (Jelmer Vernooij)

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bzrlib/directory_service.py
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# Copyright (C) 2008 Canonical Ltd
 
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# Copyright (C) 2008, 2009, 2011 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Directory service registration and usage.
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to true URLs.  Examples include lp:urls and per-user location aliases.
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"""
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from bzrlib import registry
 
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from bzrlib import (
 
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    errors,
 
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    registry,
 
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    )
 
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from bzrlib.lazy_import import lazy_import
 
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lazy_import(globals(), """
 
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from bzrlib import (
 
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    branch as _mod_branch,
 
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    urlutils,
 
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    )
 
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""")
 
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class DirectoryServiceRegistry(registry.Registry):
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    """This object maintains and uses a list of directory services.
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        return service().look_up(name, url)
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directories = DirectoryServiceRegistry()
 
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class AliasDirectory(object):
 
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    """Directory lookup for locations associated with a branch.
 
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    :parent, :submit, :public, :push, :this, and :bound are currently
 
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    supported.  On error, a subclass of DirectoryLookupFailure will be raised.
 
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    """
 
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    def look_up(self, name, url):
 
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        branch = _mod_branch.Branch.open_containing('.')[0]
 
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        lookups = {
 
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            'parent': branch.get_parent,
 
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            'submit': branch.get_submit_branch,
 
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            'public': branch.get_public_branch,
 
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            'bound': branch.get_bound_location,
 
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            'push': branch.get_push_location,
 
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            'this': lambda: branch.base
 
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        }
 
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        parts = url.split('/', 1)
 
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        if len(parts) == 2:
 
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            name, extra = parts
 
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        else:
 
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            (name,) = parts
 
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            extra = None
 
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        try:
 
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            method = lookups[name[1:]]
 
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        except KeyError:
 
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            raise errors.InvalidLocationAlias(url)
 
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        else:
 
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            result = method()
 
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        if result is None:
 
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            raise errors.UnsetLocationAlias(url)
 
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        if extra is not None:
 
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            result = urlutils.join(result, extra)
 
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        return result
 
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directories.register(':', AliasDirectory,
 
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                     'Easy access to remembered branch locations')