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# Copyright (C) 2005 Canonical Ltd
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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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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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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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from copy import deepcopy
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from cStringIO import StringIO
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from unittest import TestSuite
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import xml.sax.saxutils
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import bzrlib.bzrdir as bzrdir
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from bzrlib.decorators import needs_read_lock, needs_write_lock
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import bzrlib.errors as errors
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from bzrlib.errors import InvalidRevisionId
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from bzrlib.lockable_files import LockableFiles
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from bzrlib.osutils import safe_unicode
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from bzrlib.revision import NULL_REVISION
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from bzrlib.store import copy_all
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from bzrlib.store.weave import WeaveStore
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from bzrlib.store.text import TextStore
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from bzrlib.symbol_versioning import *
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from bzrlib.trace import mutter
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from bzrlib.tree import RevisionTree
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from bzrlib.testament import Testament
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from bzrlib.tree import EmptyTree
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class Repository(object):
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"""Repository holding history for one or more branches.
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The repository holds and retrieves historical information including
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revisions and file history. It's normally accessed only by the Branch,
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which views a particular line of development through that history.
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The Repository builds on top of Stores and a Transport, which respectively
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describe the disk data format and the way of accessing the (possibly
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def _all_possible_ids(self):
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"""Return all the possible revisions that we could find."""
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return self.get_inventory_weave().names()
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def all_revision_ids(self):
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"""Returns a list of all the revision ids in the repository.
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These are in as much topological order as the underlying store can
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present: for weaves ghosts may lead to a lack of correctness until
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the reweave updates the parents list.
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result = self._all_possible_ids()
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return self._eliminate_revisions_not_present(result)
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def _eliminate_revisions_not_present(self, revision_ids):
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"""Check every revision id in revision_ids to see if we have it.
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Returns a set of the present revisions.
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for id in revision_ids:
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if self.has_revision(id):
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"""Construct the current default format repository in a_bzrdir."""
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return RepositoryFormat.get_default_format().initialize(a_bzrdir)
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def __init__(self, transport, branch_format, _format=None, a_bzrdir=None):
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if transport is not None:
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warn("Repository.__init__(..., transport=XXX): The transport parameter is "
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"deprecated and was never in a supported release. Please use "
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"bzrdir.open_repository() or bzrdir.open_branch().repository.",
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self.control_files = LockableFiles(transport.clone(bzrlib.BZRDIR), 'README')
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# TODO: clone into repository if needed
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self.control_files = LockableFiles(a_bzrdir.get_repository_transport(None), 'README')
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dir_mode = self.control_files._dir_mode
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file_mode = self.control_files._file_mode
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self._format = _format
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self.bzrdir = a_bzrdir
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def get_weave(name, prefixed=False):
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name = safe_unicode(name)
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relpath = self.control_files._escape(name)
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weave_transport = self.control_files._transport.clone(relpath)
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ws = WeaveStore(weave_transport, prefixed=prefixed,
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if self.control_files._transport.should_cache():
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ws.enable_cache = True
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def get_store(name, compressed=True, prefixed=False):
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# FIXME: This approach of assuming stores are all entirely compressed
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# or entirely uncompressed is tidy, but breaks upgrade from
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# some existing branches where there's a mixture; we probably
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# still want the option to look for both.
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name = safe_unicode(name)
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relpath = self.control_files._escape(name)
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store = TextStore(self.control_files._transport.clone(relpath),
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prefixed=prefixed, compressed=compressed,
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#if self._transport.should_cache():
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# cache_path = os.path.join(self.cache_root, name)
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# os.mkdir(cache_path)
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# store = bzrlib.store.CachedStore(store, cache_path)
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if branch_format is not None:
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# circular dependencies:
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from bzrlib.branch import (BzrBranchFormat4,
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if isinstance(branch_format, BzrBranchFormat4):
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self._format = RepositoryFormat4()
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elif isinstance(branch_format, BzrBranchFormat5):
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self._format = RepositoryFormat5()
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elif isinstance(branch_format, BzrBranchFormat6):
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self._format = RepositoryFormat6()
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if isinstance(self._format, RepositoryFormat4):
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self.inventory_store = get_store('inventory-store')
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self.text_store = get_store('text-store')
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self.revision_store = get_store('revision-store')
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elif isinstance(self._format, RepositoryFormat5):
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self.control_weaves = get_weave('')
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self.weave_store = get_weave('weaves')
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self.revision_store = get_store('revision-store', compressed=False)
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elif isinstance(self._format, RepositoryFormat6):
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self.control_weaves = get_weave('')
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self.weave_store = get_weave('weaves', prefixed=True)
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self.revision_store = get_store('revision-store', compressed=False,
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elif isinstance(self._format, RepositoryFormat7):
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self.control_weaves = get_weave('')
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self.weave_store = get_weave('weaves', prefixed=True)
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self.revision_store = get_store('revision-store', compressed=False,
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self.revision_store.register_suffix('sig')
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def lock_write(self):
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self.control_files.lock_write()
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self.control_files.lock_read()
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def missing_revision_ids(self, other, revision_id=None):
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"""Return the revision ids that other has that this does not.
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These are returned in topological order.
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revision_id: only return revision ids included by revision_id.
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if self._compatible_formats(other):
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# fast path for weave-inventory based stores.
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# we want all revisions to satisft revision_id in other.
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# but we dont want to stat every file here and there.
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# we want then, all revisions other needs to satisfy revision_id
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# checked, but not those that we have locally.
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# so the first thing is to get a subset of the revisions to
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# satisfy revision_id in other, and then eliminate those that
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# we do already have.
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# this is slow on high latency connection to self, but as as this
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# disk format scales terribly for push anyway due to rewriting
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# inventory.weave, this is considered acceptable.
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if revision_id is not None:
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other_ids = other.get_ancestry(revision_id)
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assert other_ids.pop(0) == None
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other_ids = other._all_possible_ids()
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other_ids_set = set(other_ids)
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# other ids is the worst case to pull now.
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# now we want to filter other_ids against what we actually
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# have, but dont try to stat what we know we dont.
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my_ids = set(self._all_possible_ids())
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possibly_present_revisions = my_ids.intersection(other_ids_set)
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actually_present_revisions = set(self._eliminate_revisions_not_present(possibly_present_revisions))
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required_revisions = other_ids_set.difference(actually_present_revisions)
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required_topo_revisions = [rev_id for rev_id in other_ids if rev_id in required_revisions]
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if revision_id is not None:
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# we used get_ancestry to determine other_ids then we are assured all
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# revisions referenced are present as they are installed in topological order.
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return required_topo_revisions
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# we only have an estimate of whats available
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return other._eliminate_revisions_not_present(required_topo_revisions)
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my_ids = set(self.all_revision_ids())
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if revision_id is not None:
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other_ids = other.get_ancestry(revision_id)
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assert other_ids.pop(0) == None
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other_ids = other.all_revision_ids()
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result_set = set(other_ids).difference(my_ids)
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return [rev_id for rev_id in other_ids if rev_id in result_set]
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"""Open the repository rooted at base.
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For instance, if the repository is at URL/.bzr/repository,
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Repository.open(URL) -> a Repository instance.
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control = bzrdir.BzrDir.open(base)
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return control.open_repository()
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def _compatible_formats(self, other):
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"""Return True if the stores in self and other are 'compatible'
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'compatible' means that they are both the same underlying type
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i.e. both weave stores, or both knits and thus support fast-path
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return (isinstance(self._format, (RepositoryFormat5,
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RepositoryFormat7)) and
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isinstance(other._format, (RepositoryFormat5,
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def copy_content_into(self, destination, revision_id=None, basis=None):
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"""Make a complete copy of the content in self into destination."""
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destination.lock_write()
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if self._compatible_formats(destination):
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if basis is not None:
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# copy the basis in, then fetch remaining data.
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basis.copy_content_into(destination, revision_id)
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destination.fetch(self, revision_id=revision_id)
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if self.control_files._transport.listable():
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destination.control_weaves.copy_multi(self.control_weaves,
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copy_all(self.weave_store, destination.weave_store)
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copy_all(self.revision_store, destination.revision_store)
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destination.fetch(self, revision_id=revision_id)
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# compatible v4 stores
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elif isinstance(self._format, RepositoryFormat4):
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if not isinstance(destination._format, RepositoryFormat4):
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raise BzrError('cannot copy v4 branches to anything other than v4 branches.')
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store_pairs = ((self.text_store, destination.text_store),
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(self.inventory_store, destination.inventory_store),
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(self.revision_store, destination.revision_store))
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for from_store, to_store in store_pairs:
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copy_all(from_store, to_store)
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except UnlistableStore:
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raise UnlistableBranch(from_store)
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destination.fetch(self, revision_id=revision_id)
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def fetch(self, source, revision_id=None):
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"""Fetch the content required to construct revision_id from source.
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If revision_id is None all content is copied.
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from bzrlib.fetch import RepoFetcher
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mutter("Using fetch logic to copy between %s(%s) and %s(%s)",
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source, source._format, self, self._format)
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RepoFetcher(to_repository=self, from_repository=source, last_revision=revision_id)
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self.control_files.unlock()
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def clone(self, a_bzrdir, revision_id=None, basis=None):
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"""Clone this repository into a_bzrdir using the current format.
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Currently no check is made that the format of this repository and
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the bzrdir format are compatible. FIXME RBC 20060201.
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if not isinstance(a_bzrdir._format, self.bzrdir._format.__class__):
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# use target default format.
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result = a_bzrdir.create_repository()
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# FIXME RBC 20060209 split out the repository type to avoid this check ?
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elif isinstance(a_bzrdir._format,
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(bzrdir.BzrDirFormat4,
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bzrdir.BzrDirFormat5,
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bzrdir.BzrDirFormat6)):
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result = a_bzrdir.open_repository()
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result = self._format.initialize(a_bzrdir)
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self.copy_content_into(result, revision_id, basis)
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def has_revision(self, revision_id):
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"""True if this branch has a copy of the revision.
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This does not necessarily imply the revision is merge
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or on the mainline."""
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return (revision_id is None
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or self.revision_store.has_id(revision_id))
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def get_revision_xml_file(self, revision_id):
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"""Return XML file object for revision object."""
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if not revision_id or not isinstance(revision_id, basestring):
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raise InvalidRevisionId(revision_id=revision_id, branch=self)
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return self.revision_store.get(revision_id)
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except (IndexError, KeyError):
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raise bzrlib.errors.NoSuchRevision(self, revision_id)
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def get_revision_xml(self, revision_id):
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return self.get_revision_xml_file(revision_id).read()
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def get_revision(self, revision_id):
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"""Return the Revision object for a named revision"""
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xml_file = self.get_revision_xml_file(revision_id)
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r = bzrlib.xml5.serializer_v5.read_revision(xml_file)
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except SyntaxError, e:
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raise bzrlib.errors.BzrError('failed to unpack revision_xml',
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assert r.revision_id == revision_id
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def get_revision_sha1(self, revision_id):
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"""Hash the stored value of a revision, and return it."""
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# In the future, revision entries will be signed. At that
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# point, it is probably best *not* to include the signature
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# in the revision hash. Because that lets you re-sign
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# the revision, (add signatures/remove signatures) and still
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# have all hash pointers stay consistent.
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# But for now, just hash the contents.
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return bzrlib.osutils.sha_file(self.get_revision_xml_file(revision_id))
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def store_revision_signature(self, gpg_strategy, plaintext, revision_id):
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self.revision_store.add(StringIO(gpg_strategy.sign(plaintext)),
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def fileid_involved_between_revs(self, from_revid, to_revid):
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"""Find file_id(s) which are involved in the changes between revisions.
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This determines the set of revisions which are involved, and then
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finds all file ids affected by those revisions.
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# TODO: jam 20060119 This code assumes that w.inclusions will
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# always be correct. But because of the presence of ghosts
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# it is possible to be wrong.
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# One specific example from Robert Collins:
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# Two branches, with revisions ABC, and AD
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# C is a ghost merge of D.
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# Inclusions doesn't recognize D as an ancestor.
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# If D is ever merged in the future, the weave
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# won't be fixed, because AD never saw revision C
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# to cause a conflict which would force a reweave.
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w = self.get_inventory_weave()
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from_set = set(w.inclusions([w.lookup(from_revid)]))
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to_set = set(w.inclusions([w.lookup(to_revid)]))
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included = to_set.difference(from_set)
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changed = map(w.idx_to_name, included)
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return self._fileid_involved_by_set(changed)
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def fileid_involved(self, last_revid=None):
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"""Find all file_ids modified in the ancestry of last_revid.
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:param last_revid: If None, last_revision() will be used.
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w = self.get_inventory_weave()
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changed = set(w._names)
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included = w.inclusions([w.lookup(last_revid)])
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changed = map(w.idx_to_name, included)
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return self._fileid_involved_by_set(changed)
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def fileid_involved_by_set(self, changes):
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"""Find all file_ids modified by the set of revisions passed in.
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:param changes: A set() of revision ids
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# TODO: jam 20060119 This line does *nothing*, remove it.
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# or better yet, change _fileid_involved_by_set so
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# that it takes the inventory weave, rather than
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# pulling it out by itself.
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return self._fileid_involved_by_set(changes)
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def _fileid_involved_by_set(self, changes):
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"""Find the set of file-ids affected by the set of revisions.
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:param changes: A set() of revision ids.
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:return: A set() of file ids.
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This peaks at the Weave, interpreting each line, looking to
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see if it mentions one of the revisions. And if so, includes
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the file id mentioned.
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This expects both the Weave format, and the serialization
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to have a single line per file/directory, and to have
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fileid="" and revision="" on that line.
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assert isinstance(self._format, (RepositoryFormat5,
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RepositoryFormat7)), \
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"fileid_involved only supported for branches which store inventory as unnested xml"
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w = self.get_inventory_weave()
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for line in w._weave:
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# it is ugly, but it is due to the weave structure
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if not isinstance(line, basestring): continue
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start = line.find('file_id="')+9
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if start < 9: continue
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end = line.find('"', start)
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file_id = xml.sax.saxutils.unescape(line[start:end])
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# check if file_id is already present
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if file_id in file_ids: continue
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start = line.find('revision="')+10
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if start < 10: continue
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end = line.find('"', start)
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revision_id = xml.sax.saxutils.unescape(line[start:end])
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if revision_id in changes:
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file_ids.add(file_id)
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def get_inventory_weave(self):
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return self.control_weaves.get_weave('inventory',
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self.get_transaction())
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def get_inventory(self, revision_id):
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"""Get Inventory object by hash."""
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xml = self.get_inventory_xml(revision_id)
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return bzrlib.xml5.serializer_v5.read_inventory_from_string(xml)
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def get_inventory_xml(self, revision_id):
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"""Get inventory XML as a file object."""
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assert isinstance(revision_id, basestring), type(revision_id)
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iw = self.get_inventory_weave()
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return iw.get_text(iw.lookup(revision_id))
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raise bzrlib.errors.HistoryMissing(self, 'inventory', revision_id)
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def get_inventory_sha1(self, revision_id):
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"""Return the sha1 hash of the inventory entry
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return self.get_revision(revision_id).inventory_sha1
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def get_revision_inventory(self, revision_id):
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"""Return inventory of a past revision."""
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# TODO: Unify this with get_inventory()
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# bzr 0.0.6 and later imposes the constraint that the inventory_id
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# must be the same as its revision, so this is trivial.
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if revision_id is None:
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# This does not make sense: if there is no revision,
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# then it is the current tree inventory surely ?!
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# and thus get_root_id() is something that looks at the last
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# commit on the branch, and the get_root_id is an inventory check.
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raise NotImplementedError
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# return Inventory(self.get_root_id())
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return self.get_inventory(revision_id)
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def revision_tree(self, revision_id):
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"""Return Tree for a revision on this branch.
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`revision_id` may be None for the null revision, in which case
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an `EmptyTree` is returned."""
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# TODO: refactor this to use an existing revision object
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# so we don't need to read it in twice.
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if revision_id is None or revision_id == NULL_REVISION:
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inv = self.get_revision_inventory(revision_id)
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return RevisionTree(self, inv, revision_id)
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def get_ancestry(self, revision_id):
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"""Return a list of revision-ids integrated by a revision.
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This is topologically sorted.
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if revision_id is None:
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if not self.has_revision(revision_id):
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raise errors.NoSuchRevision(self, revision_id)
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w = self.get_inventory_weave()
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return [None] + map(w.idx_to_name,
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w.inclusions([w.lookup(revision_id)]))
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def print_file(self, file, revision_id):
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"""Print `file` to stdout.
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FIXME RBC 20060125 as John Meinel points out this is a bad api
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- it writes to stdout, it assumes that that is valid etc. Fix
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by creating a new more flexible convenience function.
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tree = self.revision_tree(revision_id)
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# use inventory as it was in that revision
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file_id = tree.inventory.path2id(file)
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raise BzrError("%r is not present in revision %s" % (file, revno))
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revno = self.revision_id_to_revno(revision_id)
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except errors.NoSuchRevision:
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# TODO: This should not be BzrError,
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# but NoSuchFile doesn't fit either
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raise BzrError('%r is not present in revision %s'
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% (file, revision_id))
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raise BzrError('%r is not present in revision %s'
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tree.print_file(file_id)
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def get_transaction(self):
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return self.control_files.get_transaction()
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def sign_revision(self, revision_id, gpg_strategy):
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plaintext = Testament.from_revision(self, revision_id).as_short_text()
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self.store_revision_signature(gpg_strategy, plaintext, revision_id)
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class RepositoryFormat(object):
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"""A repository format.
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Formats provide three things:
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* An initialization routine to construct repository data on disk.
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* a format string which is used when the BzrDir supports versioned
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* an open routine which returns a Repository instance.
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Formats are placed in an dict by their format string for reference
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during opening. These should be subclasses of RepositoryFormat
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Once a format is deprecated, just deprecate the initialize and open
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methods on the format class. Do not deprecate the object, as the
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object will be created every system load.
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Common instance attributes:
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_matchingbzrdir - the bzrdir format that the repository format was
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originally written to work with. This can be used if manually
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constructing a bzrdir and repository, or more commonly for test suite
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_default_format = None
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"""The default format used for new repositories."""
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"""The known formats."""
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def find_format(klass, a_bzrdir):
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"""Return the format for the repository object in a_bzrdir."""
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transport = a_bzrdir.get_repository_transport(None)
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format_string = transport.get("format").read()
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return klass._formats[format_string]
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except errors.NoSuchFile:
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raise errors.NoRepositoryPresent(a_bzrdir)
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raise errors.UnknownFormatError(format_string)
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def get_default_format(klass):
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"""Return the current default format."""
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return klass._default_format
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def get_format_string(self):
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"""Return the ASCII format string that identifies this format.
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Note that in pre format ?? repositories the format string is
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not permitted nor written to disk.
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raise NotImplementedError(self.get_format_string)
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def initialize(self, a_bzrdir, _internal=False):
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"""Create a weave repository.
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TODO: when creating split out bzr branch formats, move this to a common
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base for Format5, Format6. or something like that.
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from bzrlib.weavefile import write_weave_v5
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from bzrlib.weave import Weave
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# always initialized when the bzrdir is.
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return Repository(None, branch_format=None, _format=self, a_bzrdir=a_bzrdir)
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# Create an empty weave
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bzrlib.weavefile.write_weave_v5(Weave(), sio)
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empty_weave = sio.getvalue()
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mutter('creating repository in %s.', a_bzrdir.transport.base)
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dirs = ['revision-store', 'weaves']
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lock_file = 'branch-lock'
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files = [('inventory.weave', StringIO(empty_weave)),
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# FIXME: RBC 20060125 dont peek under the covers
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# NB: no need to escape relative paths that are url safe.
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control_files = LockableFiles(a_bzrdir.transport, 'branch-lock')
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control_files.lock_write()
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control_files._transport.mkdir_multi(dirs,
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mode=control_files._dir_mode)
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for file, content in files:
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control_files.put(file, content)
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control_files.unlock()
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return Repository(None, branch_format=None, _format=self, a_bzrdir=a_bzrdir)
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def is_supported(self):
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"""Is this format supported?
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Supported formats must be initializable and openable.
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Unsupported formats may not support initialization or committing or
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some other features depending on the reason for not being supported.
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def open(self, a_bzrdir, _found=False):
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"""Return an instance of this format for the bzrdir a_bzrdir.
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_found is a private parameter, do not use it.
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# we are being called directly and must probe.
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raise NotImplementedError
686
return Repository(None, branch_format=None, _format=self, a_bzrdir=a_bzrdir)
689
def register_format(klass, format):
690
klass._formats[format.get_format_string()] = format
693
def set_default_format(klass, format):
694
klass._default_format = format
697
def unregister_format(klass, format):
698
assert klass._formats[format.get_format_string()] is format
699
del klass._formats[format.get_format_string()]
702
class RepositoryFormat4(RepositoryFormat):
703
"""Bzr repository format 4.
705
This repository format has:
707
- TextStores for texts, inventories,revisions.
709
This format is deprecated: it indexes texts using a text id which is
710
removed in format 5; initializationa and write support for this format
715
super(RepositoryFormat4, self).__init__()
716
self._matchingbzrdir = bzrdir.BzrDirFormat4()
718
def initialize(self, url, _internal=False):
719
"""Format 4 branches cannot be created."""
720
raise errors.UninitializableFormat(self)
722
def is_supported(self):
723
"""Format 4 is not supported.
725
It is not supported because the model changed from 4 to 5 and the
726
conversion logic is expensive - so doing it on the fly was not
732
class RepositoryFormat5(RepositoryFormat):
733
"""Bzr control format 5.
735
This repository format has:
736
- weaves for file texts and inventory
738
- TextStores for revisions and signatures.
742
super(RepositoryFormat5, self).__init__()
743
self._matchingbzrdir = bzrdir.BzrDirFormat5()
746
class RepositoryFormat6(RepositoryFormat):
747
"""Bzr control format 6.
749
This repository format has:
750
- weaves for file texts and inventory
751
- hash subdirectory based stores.
752
- TextStores for revisions and signatures.
756
super(RepositoryFormat6, self).__init__()
757
self._matchingbzrdir = bzrdir.BzrDirFormat6()
760
class RepositoryFormat7(RepositoryFormat):
763
This repository format has:
764
- weaves for file texts and inventory
765
- hash subdirectory based stores.
766
- TextStores for revisions and signatures.
767
- a format marker of its own
770
def get_format_string(self):
771
"""See RepositoryFormat.get_format_string()."""
772
return "Bazaar-NG Repository format 7"
774
def initialize(self, a_bzrdir):
775
"""Create a weave repository.
777
from bzrlib.weavefile import write_weave_v5
778
from bzrlib.weave import Weave
780
# Create an empty weave
782
bzrlib.weavefile.write_weave_v5(Weave(), sio)
783
empty_weave = sio.getvalue()
785
mutter('creating repository in %s.', a_bzrdir.transport.base)
786
dirs = ['revision-store', 'weaves']
787
files = [('inventory.weave', StringIO(empty_weave)),
789
utf8_files = [('format', self.get_format_string())]
791
# FIXME: RBC 20060125 dont peek under the covers
792
# NB: no need to escape relative paths that are url safe.
794
repository_transport = a_bzrdir.get_repository_transport(self)
795
repository_transport.put(lock_file, StringIO()) # TODO get the file mode from the bzrdir lock files., mode=file_mode)
796
control_files = LockableFiles(repository_transport, 'lock')
797
control_files.lock_write()
798
control_files._transport.mkdir_multi(dirs,
799
mode=control_files._dir_mode)
801
for file, content in files:
802
control_files.put(file, content)
803
for file, content in utf8_files:
804
control_files.put_utf8(file, content)
806
control_files.unlock()
807
return Repository(None, branch_format=None, _format=self, a_bzrdir=a_bzrdir)
810
super(RepositoryFormat7, self).__init__()
811
self._matchingbzrdir = bzrdir.BzrDirMetaFormat1()
814
# formats which have no format string are not discoverable
815
# and not independently creatable, so are not registered.
816
__default_format = RepositoryFormat7()
817
RepositoryFormat.register_format(__default_format)
818
RepositoryFormat.set_default_format(__default_format)
819
_legacy_formats = [RepositoryFormat4(),
824
# TODO: jam 20060108 Create a new branch format, and as part of upgrade
825
# make sure that ancestry.weave is deleted (it is never used, but
826
# used to be created)
828
class RepositoryTestProviderAdapter(object):
829
"""A tool to generate a suite testing multiple repository formats at once.
831
This is done by copying the test once for each transport and injecting
832
the transport_server, transport_readonly_server, and bzrdir_format and
833
repository_format classes into each copy. Each copy is also given a new id()
834
to make it easy to identify.
837
def __init__(self, transport_server, transport_readonly_server, formats):
838
self._transport_server = transport_server
839
self._transport_readonly_server = transport_readonly_server
840
self._formats = formats
842
def adapt(self, test):
844
for repository_format, bzrdir_format in self._formats:
845
new_test = deepcopy(test)
846
new_test.transport_server = self._transport_server
847
new_test.transport_readonly_server = self._transport_readonly_server
848
new_test.bzrdir_format = bzrdir_format
849
new_test.repository_format = repository_format
850
def make_new_test_id():
851
new_id = "%s(%s)" % (new_test.id(), repository_format.__class__.__name__)
852
return lambda: new_id
853
new_test.id = make_new_test_id()
854
result.addTest(new_test)
added
removed
bzrlib/repository.py
