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