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# Copyright (C) 2007 Canonical Ltd
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# Copyright (C) 2008-2009 Jelmer Vernooij <jelmer@samba.org>
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# Copyright (C) 2008 John Carr
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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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"""Converters, etc for going between Bazaar and Git ids."""
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from bzrlib import bencode
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from bzrlib.util import bencode
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from bzrlib.inventory import (
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from bzrlib.foreign import (
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from bzrlib.revision import (
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from bzrlib.plugins.git.hg import (
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DEFAULT_FILE_MODE = stat.S_IFREG | 0644
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def escape_file_id(file_id):
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return file_id.replace('_', '__').replace(' ', '_s')
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def unescape_file_id(file_id):
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while i < len(file_id):
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ret.append(file_id[i])
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if file_id[i+1] == '_':
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elif file_id[i+1] == 's':
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raise AssertionError("unknown escape character %s" %
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def fix_person_identifier(text):
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if "<" in text and ">" in text:
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return "%s <%s>" % (text, text)
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def warn_escaped(commit, num_escaped):
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trace.warning("Escaped %d XML-invalid characters in %s. Will be unable "
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"to regenerate the SHA map.", num_escaped, commit)
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def warn_unusual_mode(commit, path, mode):
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trace.mutter("Unusual file mode %o for %s in %s. Storing as revision "
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"property. ", mode, path, commit)
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def squash_revision(target_repo, rev):
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"""Remove characters that can't be stored from a revision, if necessary.
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:param target_repo: Repository in which the revision will be stored
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:param rev: Revision object, will be modified in-place
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if not getattr(target_repo._serializer, "squashes_xml_invalid_characters", True):
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from bzrlib.xml_serializer import escape_invalid_chars
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rev.message, num_escaped = escape_invalid_chars(rev.message)
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warn_escaped(rev.foreign_revid, num_escaped)
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if 'author' in rev.properties:
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rev.properties['author'], num_escaped = escape_invalid_chars(
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rev.properties['author'])
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warn_escaped(rev.foreign_revid, num_escaped)
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rev.committer, num_escaped = escape_invalid_chars(rev.committer)
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warn_escaped(rev.foreign_revid, num_escaped)
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class BzrGitMapping(foreign.VcsMapping):
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"""Class that maps between Git and Bazaar semantics."""
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super(BzrGitMapping, self).__init__(foreign_git)
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def __eq__(self, other):
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return (type(self) == type(other) and
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self.revid_prefix == other.revid_prefix)
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def revision_id_foreign_to_bzr(cls, git_rev_id):
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"""Convert a git revision id handle to a Bazaar revision id."""
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if git_rev_id == "0" * 40:
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return "%s:%s" % (cls.revid_prefix, git_rev_id)
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def revision_id_bzr_to_foreign(cls, bzr_rev_id):
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"""Convert a Bazaar revision id to a git revision id handle."""
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if not bzr_rev_id.startswith("%s:" % cls.revid_prefix):
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raise errors.InvalidRevisionId(bzr_rev_id, cls)
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return bzr_rev_id[len(cls.revid_prefix)+1:], cls()
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def generate_file_id(self, path):
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# Git paths are just bytestrings
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# We must just hope they are valid UTF-8..
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return escape_file_id(path)
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def parse_file_id(self, file_id):
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if file_id == ROOT_ID:
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return unescape_file_id(file_id)
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def import_unusual_file_modes(self, rev, unusual_file_modes):
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if unusual_file_modes:
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ret = [(name, unusual_file_modes[name])
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for name in sorted(unusual_file_modes.keys())]
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rev.properties['file-modes'] = bencode.bencode(ret)
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def export_unusual_file_modes(self, rev):
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return dict([(self.generate_file_id(path), mode) for (path, mode) in bencode.bdecode(rev.properties['file-modes'].encode("utf-8"))])
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def _generate_git_svn_metadata(self, rev, encoding):
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return "\ngit-svn-id: %s\n" % rev.properties["git-svn-id"].encode(
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def _generate_hg_message_tail(self, rev):
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for name in rev.properties:
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if name == 'hg:extra:branch':
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branch = rev.properties['hg:extra:branch']
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elif name.startswith('hg:extra'):
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extra[name[len('hg:extra:'):]] = base64.b64decode(
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rev.properties[name])
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elif name == 'hg:renames':
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renames = bencode.bdecode(base64.b64decode(
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rev.properties['hg:renames']))
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# TODO: Export other properties as 'bzr:' extras?
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ret = format_hg_metadata(renames, branch, extra)
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assert isinstance(ret, str)
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def _extract_git_svn_metadata(self, rev, message):
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lines = message.split("\n")
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if not (lines[-1] == "" and lines[-2].startswith("git-svn-id:")):
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git_svn_id = lines[-2].split(": ", 1)[1]
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rev.properties['git-svn-id'] = git_svn_id
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(url, rev, uuid) = parse_git_svn_id(git_svn_id)
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# FIXME: Convert this to converted-from property somehow..
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ret = "\n".join(lines[:-2])
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assert isinstance(ret, str)
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def _extract_hg_metadata(self, rev, message):
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(message, renames, branch, extra) = extract_hg_metadata(message)
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if branch is not None:
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rev.properties['hg:extra:branch'] = branch
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for name, value in extra.iteritems():
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rev.properties['hg:extra:' + name] = base64.b64encode(value)
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rev.properties['hg:renames'] = base64.b64encode(bencode.bencode(
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[(new, old) for (old, new) in renames.iteritems()]))
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def _decode_commit_message(self, rev, message, encoding):
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return message.decode(encoding)
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def _encode_commit_message(self, rev, message, encoding):
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return message.encode(encoding)
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def export_commit(self, rev, tree_sha, parent_lookup):
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"""Turn a Bazaar revision in to a Git commit
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:param tree_sha: Tree sha for the commit
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:param parent_lookup: Function for looking up the GIT sha equiv of a
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:return dulwich.objects.Commit represent the revision:
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from dulwich.objects import Commit
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commit.tree = tree_sha
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for p in rev.parent_ids:
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git_p = parent_lookup(p)
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if git_p is not None:
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assert len(git_p) == 40, "unexpected length for %r" % git_p
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commit.parents.append(git_p)
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encoding = rev.properties['git-explicit-encoding']
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encoding = rev.properties.get('git-implicit-encoding', 'utf-8')
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commit.encoding = rev.properties.get('git-explicit-encoding')
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commit.committer = fix_person_identifier(rev.committer.encode(
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commit.author = fix_person_identifier(
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rev.get_apparent_authors()[0].encode(encoding))
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commit.commit_time = long(rev.timestamp)
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if 'author-timestamp' in rev.properties:
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commit.author_time = long(rev.properties['author-timestamp'])
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commit.author_time = commit.commit_time
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commit.commit_timezone = rev.timezone
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if 'author-timezone' in rev.properties:
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commit.author_timezone = int(rev.properties['author-timezone'])
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commit.author_timezone = commit.commit_timezone
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commit.message = self._encode_commit_message(rev, rev.message,
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def import_commit(self, commit):
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"""Convert a git commit to a bzr revision.
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:return: a `bzrlib.revision.Revision` object.
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raise AssertionError("Commit object can't be None")
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rev = ForeignRevision(commit.id, self,
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self.revision_id_foreign_to_bzr(commit.id))
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rev.parent_ids = tuple([self.revision_id_foreign_to_bzr(p) for p in commit.parents])
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def decode_using_encoding(rev, commit, encoding):
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rev.committer = str(commit.committer).decode(encoding)
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if commit.committer != commit.author:
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rev.properties['author'] = str(commit.author).decode(encoding)
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rev.message = self._decode_commit_message(rev, commit.message,
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if commit.encoding is not None:
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rev.properties['git-explicit-encoding'] = commit.encoding
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decode_using_encoding(rev, commit, commit.encoding)
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for encoding in ('utf-8', 'latin1'):
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decode_using_encoding(rev, commit, encoding)
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except UnicodeDecodeError:
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if encoding != 'utf-8':
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rev.properties['git-implicit-encoding'] = encoding
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if commit.commit_time != commit.author_time:
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rev.properties['author-timestamp'] = str(commit.author_time)
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if commit.commit_timezone != commit.author_timezone:
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rev.properties['author-timezone'] = "%d" % commit.author_timezone
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rev.timestamp = commit.commit_time
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rev.timezone = commit.commit_timezone
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class BzrGitMappingv1(BzrGitMapping):
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revid_prefix = 'git-v1'
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return self.revid_prefix
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class BzrGitMappingExperimental(BzrGitMappingv1):
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revid_prefix = 'git-experimental'
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def _decode_commit_message(self, rev, message, encoding):
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message = self._extract_hg_metadata(rev, message)
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message = self._extract_git_svn_metadata(rev, message)
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return message.decode(encoding)
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def _encode_commit_message(self, rev, message, encoding):
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ret = message.encode(encoding)
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ret += self._generate_hg_message_tail(rev)
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ret += self._generate_git_svn_metadata(rev, encoding)
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def import_commit(self, commit):
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rev = super(BzrGitMappingExperimental, self).import_commit(commit)
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rev.properties['converted_revision'] = "git %s\n" % commit.id
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class GitMappingRegistry(VcsMappingRegistry):
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"""Registry with available git mappings."""
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def revision_id_bzr_to_foreign(self, bzr_revid):
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if bzr_revid == NULL_REVISION:
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return "0" * 20, None
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if not bzr_revid.startswith("git-"):
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raise errors.InvalidRevisionId(bzr_revid, None)
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(mapping_version, git_sha) = bzr_revid.split(":", 1)
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mapping = self.get(mapping_version)
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return mapping.revision_id_bzr_to_foreign(bzr_revid)
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parse_revision_id = revision_id_bzr_to_foreign
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mapping_registry = GitMappingRegistry()
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mapping_registry.register_lazy('git-v1', "bzrlib.plugins.git.mapping",
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mapping_registry.register_lazy('git-experimental',
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"bzrlib.plugins.git.mapping", "BzrGitMappingExperimental")
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mapping_registry.set_default('git-v1')
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class ForeignGit(ForeignVcs):
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"""The Git Stupid Content Tracker"""
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def branch_format(self):
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from bzrlib.plugins.git.branch import GitBranchFormat
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return GitBranchFormat()
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def repository_format(self):
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from bzrlib.plugins.git.repository import GitRepositoryFormat
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return GitRepositoryFormat()
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super(ForeignGit, self).__init__(mapping_registry)
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self.abbreviation = "git"
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def serialize_foreign_revid(self, foreign_revid):
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def show_foreign_revid(cls, foreign_revid):
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return { "git commit": foreign_revid }
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foreign_git = ForeignGit()
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default_mapping = mapping_registry.get_default()()
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def symlink_to_blob(entry):
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from dulwich.objects import Blob
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symlink_target = entry.symlink_target
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if type(symlink_target) == unicode:
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symlink_target = symlink_target.encode('utf-8')
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blob.data = symlink_target
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def mode_is_executable(mode):
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"""Check if mode should be considered executable."""
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return bool(mode & 0111)
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"""Determine the Bazaar inventory kind based on Unix file mode."""
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entry_kind = (mode & 0700000) / 0100000
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elif entry_kind == 1:
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file_kind = (mode & 070000) / 010000
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return 'tree-reference'
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raise AssertionError(
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"Unknown file kind %d, perms=%o." % (file_kind, mode,))
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raise AssertionError(
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"Unknown kind, perms=%r." % (mode,))
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def object_mode(kind, executable):
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if kind == 'directory':
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elif kind == 'symlink':
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mode = stat.S_IFREG | 0644
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elif kind == 'tree-reference':
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from dulwich.objects import S_IFGITLINK
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def entry_mode(entry):
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"""Determine the git file mode for an inventory entry."""
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return object_mode(entry.kind, entry.executable)
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def directory_to_tree(entry, lookup_ie_sha1, unusual_modes):
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from dulwich.objects import Tree
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for name, value in entry.children.iteritems():
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ie = entry.children[name]
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mode = unusual_modes[ie.file_id]
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mode = entry_mode(ie)
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hexsha = lookup_ie_sha1(ie)
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if hexsha is not None:
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tree.add(mode, name.encode("utf-8"), hexsha)
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if entry.parent_id is not None and len(tree) == 0:
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# Only the root can be an empty tree
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def extract_unusual_modes(rev):
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foreign_revid, mapping = mapping_registry.parse_revision_id(
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except errors.InvalidRevisionId:
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return mapping.export_unusual_file_modes(rev)
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def inventory_to_tree_and_blobs(inventory, texts, mapping, unusual_modes,
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"""Convert a Bazaar tree to a Git tree.
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:return: Yields tuples with object sha1, object and path
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from dulwich.objects import Tree
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# stack contains the set of trees that we haven't
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# finished constructing
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for path, entry in inventory.iter_entries():
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while stack and not path.startswith(osutils.pathjoin(cur, "")):
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# We've hit a file that's not a child of the previous path
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yield sha, tree, cur.encode("utf-8")
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mode = unusual_modes.get(cur.encode("utf-8"), stat.S_IFDIR)
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t = (mode, urlutils.basename(cur).encode('UTF-8'), sha)
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cur, tree = stack.pop()
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if entry.kind == "directory":
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stack.append((cur, tree))
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if entry.kind == "file":
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from dulwich.objects import Blob
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stream = texts.get_record_stream(
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[(entry.file_id, entry.revision)], 'unordered', True)
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blob.chunked = stream.next().get_bytes_as('chunks')
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elif entry.kind == "symlink":
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blob = symlink_to_blob(entry)
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raise AssertionError("Unknown kind %s" % entry.kind)
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yield sha, blob, path.encode("utf-8")
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name = urlutils.basename(path).encode("utf-8")
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mode = unusual_modes.get(path.encode("utf-8"), entry_mode(entry))
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tree.add(mode, name, sha)
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while len(stack) > 1:
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yield sha, tree, cur.encode("utf-8")
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mode = unusual_modes.get(cur.encode('utf-8'), stat.S_IFDIR)
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t = (mode, urlutils.basename(cur).encode('UTF-8'), sha)
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cur, tree = stack.pop()
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yield tree.id, tree, cur.encode("utf-8")
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def parse_git_svn_id(text):
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(head, uuid) = text.rsplit(" ", 1)
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(full_url, rev) = head.rsplit("@", 1)
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return (full_url, int(rev), uuid)
added
removed
mapping.py
