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# Copyright (C) 2008 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Foreign branch utilities."""
from bzrlib.branch import Branch
from bzrlib.commands import Command, Option
from bzrlib.repository import Repository
from bzrlib.revision import Revision
from bzrlib.lazy_import import lazy_import
lazy_import(globals(), """
from bzrlib import (
errors,
osutils,
registry,
)
""")
class VcsMapping(object):
"""Describes the mapping between the semantics of Bazaar and a foreign vcs.
"""
# Whether this is an experimental mapping that is still open to changes.
experimental = False
# Whether this mapping supports exporting and importing all bzr semantics.
roundtripping = False
# Prefix used when importing native foreign revisions (not roundtripped)
# using this mapping.
revid_prefix = None
def __init__(self, vcs):
"""Create a new VcsMapping.
:param vcs: VCS that this mapping maps to Bazaar
"""
self.vcs = vcs
def revision_id_bzr_to_foreign(self, bzr_revid):
"""Parse a bzr revision id and convert it to a foreign revid.
:param bzr_revid: The bzr revision id (a string).
:return: A foreign revision id, can be any sort of object.
"""
raise NotImplementedError(self.revision_id_bzr_to_foreign)
def revision_id_foreign_to_bzr(self, foreign_revid):
"""Parse a foreign revision id and convert it to a bzr revid.
:param foreign_revid: Foreign revision id, can be any sort of object.
:return: A bzr revision id.
"""
raise NotImplementedError(self.revision_id_foreign_to_bzr)
class VcsMappingRegistry(registry.Registry):
"""Registry for Bazaar<->foreign VCS mappings.
There should be one instance of this registry for every foreign VCS.
"""
def register(self, key, factory, help):
"""Register a mapping between Bazaar and foreign VCS semantics.
The factory must be a callable that takes one parameter: the key.
It must produce an instance of VcsMapping when called.
"""
if ":" in key:
raise ValueError("mapping name can not contain colon (:)")
registry.Registry.register(self, key, factory, help)
def set_default(self, key):
"""Set the 'default' key to be a clone of the supplied key.
This method must be called once and only once.
"""
self._set_default_key(key)
def get_default(self):
"""Convenience function for obtaining the default mapping to use."""
return self.get(self._get_default_key())
def revision_id_bzr_to_foreign(self, revid):
"""Convert a bzr revision id to a foreign revid."""
raise NotImplementedError(self.revision_id_bzr_to_foreign)
class ForeignRevision(Revision):
"""A Revision from a Foreign repository. Remembers
information about foreign revision id and mapping.
"""
def __init__(self, foreign_revid, mapping, *args, **kwargs):
if not "inventory_sha1" in kwargs:
kwargs["inventory_sha1"] = ""
super(ForeignRevision, self).__init__(*args, **kwargs)
self.foreign_revid = foreign_revid
self.mapping = mapping
def show_foreign_properties(rev):
"""Custom log displayer for foreign revision identifiers.
:param rev: Revision object.
"""
# Revision comes directly from a foreign repository
if isinstance(rev, ForeignRevision):
return rev.mapping.vcs.show_foreign_revid(rev.foreign_revid)
# Revision was once imported from a foreign repository
try:
foreign_revid, mapping = \
foreign_vcs_registry.parse_revision_id(rev.revision_id)
except errors.InvalidRevisionId:
return {}
return mapping.vcs.show_foreign_revid(foreign_revid)
class ForeignVcs(object):
"""A foreign version control system."""
def __init__(self, mapping_registry):
self.mapping_registry = mapping_registry
def show_foreign_revid(self, foreign_revid):
"""Prepare a foreign revision id for formatting using bzr log.
:param foreign_revid: Foreign revision id.
:return: Dictionary mapping string keys to string values.
"""
return { }
class ForeignVcsRegistry(registry.Registry):
"""Registry for Foreign VCSes.
There should be one entry per foreign VCS. Example entries would be
"git", "svn", "hg", "darcs", etc.
"""
def register(self, key, foreign_vcs, help):
"""Register a foreign VCS.
:param key: Prefix of the foreign VCS in revision ids
:param foreign_vcs: ForeignVCS instance
:param help: Description of the foreign VCS
"""
if ":" in key or "-" in key:
raise ValueError("vcs name can not contain : or -")
registry.Registry.register(self, key, foreign_vcs, help)
def parse_revision_id(self, revid):
"""Parse a bzr revision and return the matching mapping and foreign
revid.
:param revid: The bzr revision id
:return: tuple with foreign revid and vcs mapping
"""
if not "-" in revid:
raise errors.InvalidRevisionId(revid, None)
try:
foreign_vcs = self.get(revid.split("-")[0])
except KeyError:
raise errors.InvalidRevisionId(revid, None)
return foreign_vcs.mapping_registry.revision_id_bzr_to_foreign(revid)
foreign_vcs_registry = ForeignVcsRegistry()
class ForeignRepository(Repository):
"""A Repository that exists in a foreign version control system.
The data in this repository can not be represented natively using
Bazaars internal datastructures, but have to converted using a VcsMapping.
"""
# This repository's native version control system
vcs = None
def has_foreign_revision(self, foreign_revid):
"""Check whether the specified foreign revision is present.
:param foreign_revid: A foreign revision id, in the format used
by this Repository's VCS.
"""
raise NotImplementedError(self.has_foreign_revision)
def lookup_bzr_revision_id(self, revid):
"""Lookup a mapped or roundtripped revision by revision id.
:param revid: Bazaar revision id
:return: Tuple with foreign revision id and mapping.
"""
raise NotImplementedError(self.lookup_revision_id)
def all_revision_ids(self, mapping=None):
"""See Repository.all_revision_ids()."""
raise NotImplementedError(self.all_revision_ids)
def get_default_mapping(self):
"""Get the default mapping for this repository."""
raise NotImplementedError(self.get_default_mapping)
def get_inventory_xml(self, revision_id):
"""See Repository.get_inventory_xml()."""
return self.serialise_inventory(self.get_inventory(revision_id))
def get_inventory_sha1(self, revision_id):
"""Get the sha1 for the XML representation of an inventory.
:param revision_id: Revision id of the inventory for which to return
the SHA1.
:return: XML string
"""
return osutils.sha_string(self.get_inventory_xml(revision_id))
def get_revision_xml(self, revision_id):
"""Return the XML representation of a revision.
:param revision_id: Revision for which to return the XML.
:return: XML string
"""
return self._serializer.write_revision_to_string(
self.get_revision(revision_id))
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