# bzr.py - bzr support for the convert extension
#
# Copyright 2008, 2009 Marek Kubica <marek@xivilization.net> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
# This module is for handling 'bzr', that was formerly known as Bazaar-NG;
# it cannot access 'bar' repositories, but they were never used very much
import os
from mercurial import demandimport
# these do not work with demandimport, blacklist
demandimport.ignore.extend([
'bzrlib.transactions',
'bzrlib.urlutils',
])
from mercurial.i18n import _
from mercurial import util
from common import NoRepo, commit, converter_source
try:
# bazaar imports
from bzrlib import branch, revision, errors
from bzrlib.revisionspec import RevisionSpec
except ImportError:
pass
supportedkinds = ('file', 'symlink')
class bzr_source(converter_source):
"""Reads Bazaar repositories by using the Bazaar Python libraries"""
def __init__(self, ui, path, rev=None):
super(bzr_source, self).__init__(ui, path, rev=rev)
if not os.path.exists(os.path.join(path, '.bzr')):
raise NoRepo('%s does not look like a Bazaar repo' % path)
try:
# access bzrlib stuff
branch
except NameError:
raise NoRepo('Bazaar modules could not be loaded')
path = os.path.abspath(path)
self._checkrepotype(path)
self.branch = branch.Branch.open(path)
self.sourcerepo = self.branch.repository
self._parentids = {}
def _checkrepotype(self, path):
# Lightweight checkouts detection is informational but probably
# fragile at API level. It should not terminate the conversion.
try:
from bzrlib import bzrdir
dir = bzrdir.BzrDir.open_containing(path)[0]
try:
tree = dir.open_workingtree(recommend_upgrade=False)
branch = tree.branch
except (errors.NoWorkingTree, errors.NotLocalUrl), e:
tree = None
branch = dir.open_branch()
if (tree is not None and tree.bzrdir.root_transport.base !=
branch.bzrdir.root_transport.base):
self.ui.warn(_('warning: lightweight checkouts may cause '
'conversion failures, try with a regular '
'branch instead.\n'))
except:
self.ui.note(_('bzr source type could not be determined\n'))
def before(self):
"""Before the conversion begins, acquire a read lock
for all the operations that might need it. Fortunately
read locks don't block other reads or writes to the
repository, so this shouldn't have any impact on the usage of
the source repository.
The alternative would be locking on every operation that
needs locks (there are currently two: getting the file and
getting the parent map) and releasing immediately after,
but this approach can take even 40% longer."""
self.sourcerepo.lock_read()
def after(self):
self.sourcerepo.unlock()
def getheads(self):
if not self.rev:
return [self.branch.last_revision()]
try:
r = RevisionSpec.from_string(self.rev)
info = r.in_history(self.branch)
except errors.BzrError:
raise util.Abort(_('%s is not a valid revision in current branch')
% self.rev)
return [info.rev_id]
def getfile(self, name, rev):
revtree = self.sourcerepo.revision_tree(rev)
fileid = revtree.path2id(name.decode(self.encoding or 'utf-8'))
kind = None
if fileid is not None:
kind = revtree.kind(fileid)
if kind not in supportedkinds:
# the file is not available anymore - was deleted
raise IOError(_('%s is not available in %s anymore') %
(name, rev))
if kind == 'symlink':
target = revtree.get_symlink_target(fileid)
if target is None:
raise util.Abort(_('%s.%s symlink has no target')
% (name, rev))
return target
else:
sio = revtree.get_file(fileid)
return sio.read()
def getmode(self, name, rev):
return self._modecache[(name, rev)]
def getchanges(self, version):
# set up caches: modecache and revtree
self._modecache = {}
self._revtree = self.sourcerepo.revision_tree(version)
# get the parentids from the cache
parentids = self._parentids.pop(version)
# only diff against first parent id
prevtree = self.sourcerepo.revision_tree(parentids[0])
return self._gettreechanges(self._revtree, prevtree)
def getcommit(self, version):
rev = self.sourcerepo.get_revision(version)
# populate parent id cache
if not rev.parent_ids:
parents = []
self._parentids[version] = (revision.NULL_REVISION,)
else:
parents = self._filterghosts(rev.parent_ids)
self._parentids[version] = parents
return commit(parents=parents,
date='%d %d' % (rev.timestamp, -rev.timezone),
author=self.recode(rev.committer),
# bzr returns bytestrings or unicode, depending on the content
desc=self.recode(rev.message),
rev=version)
def gettags(self):
if not self.branch.supports_tags():
return {}
tagdict = self.branch.tags.get_tag_dict()
bytetags = {}
for name, rev in tagdict.iteritems():
bytetags[self.recode(name)] = rev
return bytetags
def getchangedfiles(self, rev, i):
self._modecache = {}
curtree = self.sourcerepo.revision_tree(rev)
if i is not None:
parentid = self._parentids[rev][i]
else:
# no parent id, get the empty revision
parentid = revision.NULL_REVISION
prevtree = self.sourcerepo.revision_tree(parentid)
changes = [e[0] for e in self._gettreechanges(curtree, prevtree)[0]]
return changes
def _gettreechanges(self, current, origin):
revid = current._revision_id;
changes = []
renames = {}
for (fileid, paths, changed_content, versioned, parent, name,
kind, executable) in current.iter_changes(origin):
if paths[0] == u'' or paths[1] == u'':
# ignore changes to tree root
continue
# bazaar tracks directories, mercurial does not, so
# we have to rename the directory contents
if kind[1] == 'directory':
if kind[0] not in (None, 'directory'):
# Replacing 'something' with a directory, record it
# so it can be removed.
changes.append((self.recode(paths[0]), revid))
if None not in paths and paths[0] != paths[1]:
# neither an add nor an delete - a move
# rename all directory contents manually
subdir = origin.inventory.path2id(paths[0])
# get all child-entries of the directory
for name, entry in origin.inventory.iter_entries(subdir):
# hg does not track directory renames
if entry.kind == 'directory':
continue
frompath = self.recode(paths[0] + '/' + name)
topath = self.recode(paths[1] + '/' + name)
# register the files as changed
changes.append((frompath, revid))
changes.append((topath, revid))
# add to mode cache
mode = ((entry.executable and 'x') or (entry.kind == 'symlink' and 's')
or '')
self._modecache[(topath, revid)] = mode
# register the change as move
renames[topath] = frompath
# no futher changes, go to the next change
continue
# we got unicode paths, need to convert them
path, topath = [self.recode(part) for part in paths]
if topath is None:
# file deleted
changes.append((path, revid))
continue
# renamed
if path and path != topath:
renames[topath] = path
changes.append((path, revid))
# populate the mode cache
kind, executable = [e[1] for e in (kind, executable)]
mode = ((executable and 'x') or (kind == 'symlink' and 'l')
or '')
self._modecache[(topath, revid)] = mode
changes.append((topath, revid))
return changes, renames
def _filterghosts(self, ids):
"""Filters out ghost revisions which hg does not support, see
<http://bazaar-vcs.org/GhostRevision>
"""
parentmap = self.sourcerepo.get_parent_map(ids)
parents = tuple([parent for parent in ids if parent in parentmap])
return parents
def recode(self, s, encoding=None):
"""This version of recode tries to encode unicode to bytecode,
and preferably using the UTF-8 codec.
Other types than Unicode are silently returned, this is by
intention, e.g. the None-type is not going to be encoded but instead
just passed through
"""
if not encoding:
encoding = self.encoding or 'utf-8'
if isinstance(s, unicode):
return s.encode(encoding)
else:
# leave it alone
return s