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# Copyright (C) 2009 Jelmer Vernooij <jelmer@samba.org>
#
# 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
"""Map from Git sha's to Bazaar objects."""
from dulwich.objects import (
Blob,
Tree,
)
import stat
from bzrlib import (
errors,
ui,
)
from bzrlib.plugins.git.mapping import (
directory_to_tree,
mapping_registry,
revision_to_commit,
)
from bzrlib.plugins.git.shamap import (
SqliteGitShaMap,
)
class BazaarObjectStore(object):
"""A Git-style object store backed onto a Bazaar repository."""
def __init__(self, repository, mapping=None):
self.repository = repository
if mapping is None:
self.mapping = self.repository.get_mapping()
else:
self.mapping = mapping
self._idmap = SqliteGitShaMap.from_repository(repository)
def _update_sha_map(self):
all_revids = self.repository.all_revision_ids()
graph = self.repository.get_graph()
present_revids = set(self._idmap.revids())
missing_revids = [revid for revid in graph.iter_topo_order(all_revids) if revid not in present_revids]
pb = ui.ui_factory.nested_progress_bar()
try:
for i, revid in enumerate(missing_revids):
pb.update("updating git map", i, len(missing_revids))
self._update_sha_map_revision(revid)
finally:
self._idmap.commit()
pb.finished()
def _update_sha_map_revision(self, revid):
inv = self.repository.get_inventory(revid)
tree_sha = self._get_ie_sha1(inv.root, inv)
rev = self.repository.get_revision(revid)
commit_obj = revision_to_commit(rev, tree_sha,
self._idmap._parent_lookup)
try:
foreign_revid, mapping = mapping_registry.parse_revision_id(revid)
except errors.InvalidRevisionId:
pass
else:
if foreign_revid != commit_obj.id:
raise AssertionError("recreated git commit had different sha1: expected %s, got %s" % (foreign_revid, commit_obj.id))
self._idmap.add_entry(commit_obj.id, "commit", (revid, tree_sha))
def _check_expected_sha(self, expected_sha, object):
if expected_sha is None:
return
if expected_sha != object.id:
raise AssertionError("Invalid sha for %r: %s" % (object, expected_sha))
def _get_ie_object(self, entry, inv):
if entry.kind == "directory":
return self._get_tree(entry.file_id, inv.revision_id, inv=inv)
else:
return self._get_blob(entry.file_id, entry.revision)
def _get_ie_object_or_sha1(self, entry, inv):
if entry.kind == "directory":
try:
return self._idmap.lookup_tree(entry.file_id, inv.revision_id), None
except KeyError:
ret = self._get_ie_object(entry, inv)
self._idmap.add_entry(ret.id, "tree", (entry.file_id, inv.revision_id))
return ret.id, ret
else:
try:
return self._idmap.lookup_blob(entry.file_id, entry.revision), None
except KeyError:
ret = self._get_ie_object(entry, inv)
self._idmap.add_entry(ret.id, "blob", (entry.file_id, entry.revision))
return ret.id, ret
def _get_ie_sha1(self, entry, inv):
return self._get_ie_object_or_sha1(entry, inv)[0]
def _get_blob(self, fileid, revision, expected_sha=None):
"""Return a Git Blob object from a fileid and revision stored in bzr.
:param fileid: File id of the text
:param revision: Revision of the text
"""
text = self.repository.texts.get_record_stream([(fileid, revision)],
"unordered", True).next().get_bytes_as("fulltext")
blob = Blob()
blob._text = text
self._check_expected_sha(expected_sha, blob)
return blob
def _get_tree(self, fileid, revid, inv=None, expected_sha=None):
"""Return a Git Tree object from a file id and a revision stored in bzr.
:param fileid: fileid in the tree.
:param revision: Revision of the tree.
"""
if inv is None:
inv = self.repository.get_inventory(revid)
tree = directory_to_tree(inv[fileid], lambda ie: self._get_ie_sha1(ie, inv))
self._check_expected_sha(expected_sha, tree)
return tree
def _get_commit(self, revid, tree_sha, expected_sha=None):
rev = self.repository.get_revision(revid)
commit = revision_to_commit(rev, tree_sha, self._lookup_revision_sha1)
self._check_expected_sha(expected_sha, commit)
return commit
def _lookup_revision_sha1(self, revid):
try:
return self._idmap._parent_lookup(revid)
except KeyError:
inv = self.repository.get_inventory(revid)
tree_sha = self._get_ie_sha1(inv.root, inv)
ret = self._get_commit(revid, tree_sha).id
self._idmap.add_entry(ret, "commit", (revid, tree_sha))
return ret
def get_raw(self, sha):
return self[sha]._text
def __getitem__(self, sha):
# See if sha is in map
try:
(type, type_data) = self._idmap.lookup_git_sha(sha)
except KeyError:
# if not, see if there are any unconverted revisions and add them
# to the map, search for sha in map again
self._update_sha_map()
(type, type_data) = self._idmap.lookup_git_sha(sha)
# convert object to git object
if type == "commit":
return self._get_commit(type_data[0], type_data[1],
expected_sha=sha)
elif type == "blob":
return self._get_blob(type_data[0], type_data[1], expected_sha=sha)
elif type == "tree":
return self._get_tree(type_data[0], type_data[1], expected_sha=sha)
else:
raise AssertionError("Unknown object type '%s'" % type)
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