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# Copyright (C) 2011 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
"""File graph access."""
from __future__ import absolute_import
from dulwich.errors import (
NotTreeError,
)
from dulwich.object_store import (
tree_lookup_path,
)
from bzrlib.revision import (
NULL_REVISION,
)
class GitFileLastChangeScanner(object):
def __init__(self, repository):
self.repository = repository
self.store = self.repository._git.object_store
def find_last_change_revision(self, path, commit_id):
commit = self.store[commit_id]
target_mode, target_sha = tree_lookup_path(self.store.__getitem__,
commit.tree, path)
while True:
parent_commits = [self.store[c] for c in commit.parents]
for parent_commit in parent_commits:
try:
mode, sha = tree_lookup_path(self.store.__getitem__,
parent_commit.tree, path)
except (NotTreeError, KeyError):
continue
if mode != target_mode or sha != target_sha:
return (path, commit.id)
if parent_commits == []:
break
commit = parent_commits[0]
return (path, commit.id)
class GitFileParentProvider(object):
def __init__(self, change_scanner):
self.change_scanner = change_scanner
self.store = self.change_scanner.repository._git.object_store
def _get_parents(self, file_id, text_revision):
commit_id, mapping = self.change_scanner.repository.lookup_bzr_revision_id(
text_revision)
path = mapping.parse_file_id(file_id)
text_parents = []
for commit_parent in self.store[commit_id].parents:
(_, text_parent) = self.change_scanner.find_last_change_revision(path, commit_parent)
if text_parent not in text_parents:
text_parents.append(text_parent)
return tuple([(file_id,
self.change_scanner.repository.lookup_foreign_revision_id(p)) for p
in text_parents])
def get_parent_map(self, keys):
ret = {}
for key in keys:
(file_id, text_revision) = key
if text_revision == NULL_REVISION:
continue
try:
ret[key] = self._get_parents(file_id, text_revision)
except KeyError:
pass
return ret
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