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# Copyright (C) 2008 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
from bzrlib import osutils, ui, urlutils
from bzrlib.errors import InvalidRevisionId
from bzrlib.inventory import Inventory
from bzrlib.repository import InterRepository
from bzrlib.trace import info
from bzrlib.tsort import topo_sort
from bzrlib.plugins.git import git
from bzrlib.plugins.git.repository import (
LocalGitRepository,
GitRepository,
GitFormat,
)
from bzrlib.plugins.git.remote import RemoteGitRepository
from dulwich.objects import Commit
from cStringIO import StringIO
class BzrFetchGraphWalker(object):
def __init__(self, repository, mapping):
self.repository = repository
self.mapping = mapping
self.done = set()
self.heads = set(repository.all_revision_ids())
self.parents = {}
def ack(self, sha):
revid = self.mapping.revision_id_foreign_to_bzr(sha)
self.remove(revid)
def remove(self, revid):
self.done.add(revid)
if ref in self.heads:
self.heads.remove(revid)
if revid in self.parents:
for p in self.parents[revid]:
self.remove(p)
def next(self):
while self.heads:
ret = self.heads.pop()
ps = self.repository.get_parent_map([ret])[ret]
self.parents[ret] = ps
self.heads.update([p for p in ps if not p in self.done])
try:
self.done.add(ret)
return self.mapping.revision_id_bzr_to_foreign(ret)
except InvalidRevisionId:
pass
return None
def import_git_blob(repo, mapping, path, blob, inv, parent_invs, executable):
"""Import a git blob object into a bzr repository.
:param repo: bzr repository
:param path: Path in the tree
:param blob: A git blob
"""
file_id = mapping.generate_file_id(path)
text_revision = inv.revision_id
repo.texts.add_lines((file_id, text_revision),
[(file_id, p[file_id].revision) for p in parent_invs if file_id in p],
osutils.split_lines(blob.data))
ie = inv.add_path(path, "file", file_id)
ie.revision = text_revision
ie.text_size = len(blob.data)
ie.text_sha1 = osutils.sha_string(blob.data)
ie.executable = executable
def import_git_tree(repo, mapping, path, tree, inv, parent_invs, lookup_object):
"""Import a git tree object into a bzr repository.
:param repo: A Bzr repository object
:param path: Path in the tree
:param tree: A git tree object
:param inv: Inventory object
"""
file_id = mapping.generate_file_id(path)
text_revision = inv.revision_id
repo.texts.add_lines((file_id, text_revision),
[(file_id, p[file_id].revision) for p in parent_invs if file_id in p],
[])
ie = inv.add_path(path, "directory", file_id)
ie.revision = text_revision
for mode, name, hexsha in tree.entries():
entry_kind = (mode & 0700000) / 0100000
basename = name.decode("utf-8")
if path == "":
child_path = name
else:
child_path = urlutils.join(path, name)
if entry_kind == 0:
tree = lookup_object(hexsha)
import_git_tree(repo, mapping, child_path, tree, inv, parent_invs, lookup_object)
elif entry_kind == 1:
blob = lookup_object(hexsha)
fs_mode = mode & 0777
import_git_blob(repo, mapping, child_path, blob, inv, parent_invs, bool(fs_mode & 0111))
else:
raise AssertionError("Unknown blob kind, perms=%r." % (mode,))
def import_git_objects(repo, mapping, object_iter, pb=None):
"""Import a set of git objects into a bzr repository.
:param repo: Bazaar repository
:param mapping: Mapping to use
:param object_iter: Iterator over Git objects.
"""
# TODO: a more (memory-)efficient implementation of this
objects = {}
for i, o in enumerate(object_iter):
if pb is not None:
pb.update("fetching objects", i)
objects[o.id] = o
graph = []
root_trees = {}
revisions = {}
# Find and convert commit objects
for o in objects.itervalues():
if isinstance(o, Commit):
rev = mapping.import_commit(o)
root_trees[rev.revision_id] = objects[o.tree]
revisions[rev.revision_id] = rev
graph.append((rev.revision_id, rev.parent_ids))
# Order the revisions
# Create the inventory objects
for i, revid in enumerate(topo_sort(graph)):
if pb is not None:
pb.update("fetching revisions", i, len(graph))
root_tree = root_trees[revid]
rev = revisions[revid]
# We have to do this here, since we have to walk the tree and
# we need to make sure to import the blobs / trees with the riht
# path; this may involve adding them more than once.
inv = Inventory()
inv.revision_id = rev.revision_id
def lookup_object(sha):
if sha in objects:
return objects[sha]
return reconstruct_git_object(repo, mapping, sha)
parent_invs = [repo.get_inventory(r) for r in rev.parent_ids]
import_git_tree(repo, mapping, "", root_tree, inv, parent_invs,
lookup_object)
repo.add_revision(rev.revision_id, rev, inv)
def reconstruct_git_commit(repo, rev):
raise NotImplementedError(self.reconstruct_git_commit)
def reconstruct_git_object(repo, mapping, sha):
# Commit
revid = mapping.revision_id_foreign_to_bzr(sha)
try:
rev = repo.get_revision(revid)
except NoSuchRevision:
pass
else:
return reconstruct_git_commit(rev)
# TODO: Tree
# TODO: Blob
raise KeyError("No such object %s" % sha)
class InterGitRepository(InterRepository):
_matching_repo_format = GitFormat()
@staticmethod
def _get_repo_format_to_test():
return None
def copy_content(self, revision_id=None, pb=None):
"""See InterRepository.copy_content."""
self.fetch(revision_id, pb, find_ghosts=False)
def fetch(self, revision_id=None, pb=None, find_ghosts=False,
mapping=None):
if mapping is None:
mapping = self.source.get_mapping()
def progress(text):
pb.note("git: %s", text)
def determine_wants(heads):
if revision_id is None:
ret = heads.values()
else:
ret = [mapping.revision_id_bzr_to_foreign(revision_id)]
return [rev for rev in ret if not self.target.has_revision(mapping.revision_id_foreign_to_bzr(rev))]
graph_walker = BzrFetchGraphWalker(self.target, mapping)
create_pb = None
if pb is None:
create_pb = pb = ui.ui_factory.nested_progress_bar()
try:
self.target.lock_write()
try:
self.target.start_write_group()
try:
import_git_objects(self.target, mapping,
iter(self.source.fetch_objects(determine_wants, graph_walker,
progress)), pb)
finally:
self.target.commit_write_group()
finally:
self.target.unlock()
finally:
if create_pb:
create_pb.finished()
@staticmethod
def is_compatible(source, target):
"""Be compatible with GitRepository."""
# FIXME: Also check target uses VersionedFile
return (isinstance(source, GitRepository) and
target.supports_rich_root())
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