/usr/share/pyshared/bzrlib/branchbuilder.py is in python-bzrlib 2.6.0~bzr6526-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 | # Copyright (C) 2007, 2008, 2009 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Utility for create branches with particular contents."""
from __future__ import absolute_import
from bzrlib import (
controldir,
commit,
errors,
memorytree,
revision,
)
class BranchBuilder(object):
r"""A BranchBuilder aids creating Branches with particular shapes.
The expected way to use BranchBuilder is to construct a
BranchBuilder on the transport you want your branch on, and then call
appropriate build_ methods on it to get the shape of history you want.
This is meant as a helper for the test suite, not as a general class for
real data.
For instance:
>>> from bzrlib.transport.memory import MemoryTransport
>>> builder = BranchBuilder(MemoryTransport("memory:///"))
>>> builder.start_series()
>>> builder.build_snapshot('rev-id', None, [
... ('add', ('', 'root-id', 'directory', '')),
... ('add', ('filename', 'f-id', 'file', 'content\n'))])
'rev-id'
>>> builder.build_snapshot('rev2-id', ['rev-id'],
... [('modify', ('f-id', 'new-content\n'))])
'rev2-id'
>>> builder.finish_series()
>>> branch = builder.get_branch()
:ivar _tree: This is a private member which is not meant to be modified by
users of this class. While a 'series' is in progress, it should hold a
MemoryTree with the contents of the last commit (ready to be modified
by the next build_snapshot command) with a held write lock. Outside of
a series in progress, it should be None.
"""
def __init__(self, transport=None, format=None, branch=None):
"""Construct a BranchBuilder on transport.
:param transport: The transport the branch should be created on.
If the path of the transport does not exist but its parent does
it will be created.
:param format: Either a BzrDirFormat, or the name of a format in the
controldir format registry for the branch to be built.
:param branch: An already constructed branch to use. This param is
mutually exclusive with the transport and format params.
"""
if branch is not None:
if format is not None:
raise AssertionError(
"branch and format kwargs are mutually exclusive")
if transport is not None:
raise AssertionError(
"branch and transport kwargs are mutually exclusive")
self._branch = branch
else:
if not transport.has('.'):
transport.mkdir('.')
if format is None:
format = 'default'
if isinstance(format, str):
format = controldir.format_registry.make_bzrdir(format)
self._branch = controldir.ControlDir.create_branch_convenience(
transport.base, format=format, force_new_tree=False)
self._tree = None
def build_commit(self, parent_ids=None, allow_leftmost_as_ghost=False,
**commit_kwargs):
"""Build a commit on the branch.
This makes a commit with no real file content for when you only want
to look at the revision graph structure.
:param commit_kwargs: Arguments to pass through to commit, such as
timestamp.
"""
if parent_ids is not None:
if len(parent_ids) == 0:
base_id = revision.NULL_REVISION
else:
base_id = parent_ids[0]
if base_id != self._branch.last_revision():
self._move_branch_pointer(base_id,
allow_leftmost_as_ghost=allow_leftmost_as_ghost)
tree = memorytree.MemoryTree.create_on_branch(self._branch)
tree.lock_write()
try:
if parent_ids is not None:
tree.set_parent_ids(parent_ids,
allow_leftmost_as_ghost=allow_leftmost_as_ghost)
tree.add('')
return self._do_commit(tree, **commit_kwargs)
finally:
tree.unlock()
def _do_commit(self, tree, message=None, message_callback=None, **kwargs):
reporter = commit.NullCommitReporter()
if message is None and message_callback is None:
message = u'commit %d' % (self._branch.revno() + 1,)
return tree.commit(message, message_callback=message_callback,
reporter=reporter,
**kwargs)
def _move_branch_pointer(self, new_revision_id,
allow_leftmost_as_ghost=False):
"""Point self._branch to a different revision id."""
self._branch.lock_write()
try:
# We don't seem to have a simple set_last_revision(), so we
# implement it here.
cur_revno, cur_revision_id = self._branch.last_revision_info()
try:
g = self._branch.repository.get_graph()
new_revno = g.find_distance_to_null(new_revision_id,
[(cur_revision_id, cur_revno)])
self._branch.set_last_revision_info(new_revno, new_revision_id)
except errors.GhostRevisionsHaveNoRevno:
if not allow_leftmost_as_ghost:
raise
new_revno = 1
finally:
self._branch.unlock()
if self._tree is not None:
# We are currently processing a series, but when switching branch
# pointers, it is easiest to just create a new memory tree.
# That way we are sure to have the right files-on-disk
# We are cheating a little bit here, and locking the new tree
# before the old tree is unlocked. But that way the branch stays
# locked throughout.
new_tree = memorytree.MemoryTree.create_on_branch(self._branch)
new_tree.lock_write()
self._tree.unlock()
self._tree = new_tree
def start_series(self):
"""We will be creating a series of commits.
This allows us to hold open the locks while we are processing.
Make sure to call 'finish_series' when you are done.
"""
if self._tree is not None:
raise AssertionError('You cannot start a new series while a'
' series is already going.')
self._tree = memorytree.MemoryTree.create_on_branch(self._branch)
self._tree.lock_write()
def finish_series(self):
"""Call this after start_series to unlock the various objects."""
self._tree.unlock()
self._tree = None
def build_snapshot(self, revision_id, parent_ids, actions,
message=None, timestamp=None, allow_leftmost_as_ghost=False,
committer=None, timezone=None, message_callback=None):
"""Build a commit, shaped in a specific way.
Most of the actions are self-explanatory. 'flush' is special action to
break a series of actions into discrete steps so that complex changes
(such as unversioning a file-id and re-adding it with a different kind)
can be expressed in a way that will clearly work.
:param revision_id: The handle for the new commit, can be None
:param parent_ids: A list of parent_ids to use for the commit.
It can be None, which indicates to use the last commit.
:param actions: A list of actions to perform. Supported actions are:
('add', ('path', 'file-id', 'kind', 'content' or None))
('modify', ('file-id', 'new-content'))
('unversion', 'file-id')
('rename', ('orig-path', 'new-path'))
('flush', None)
:param message: An optional commit message, if not supplied, a default
commit message will be written.
:param message_callback: A message callback to use for the commit, as
per mutabletree.commit.
:param timestamp: If non-None, set the timestamp of the commit to this
value.
:param timezone: An optional timezone for timestamp.
:param committer: An optional username to use for commit
:param allow_leftmost_as_ghost: True if the leftmost parent should be
permitted to be a ghost.
:return: The revision_id of the new commit
"""
if parent_ids is not None:
if len(parent_ids) == 0:
base_id = revision.NULL_REVISION
else:
base_id = parent_ids[0]
if base_id != self._branch.last_revision():
self._move_branch_pointer(base_id,
allow_leftmost_as_ghost=allow_leftmost_as_ghost)
if self._tree is not None:
tree = self._tree
else:
tree = memorytree.MemoryTree.create_on_branch(self._branch)
tree.lock_write()
try:
if parent_ids is not None:
tree.set_parent_ids(parent_ids,
allow_leftmost_as_ghost=allow_leftmost_as_ghost)
# Unfortunately, MemoryTree.add(directory) just creates an
# inventory entry. And the only public function to create a
# directory is MemoryTree.mkdir() which creates the directory, but
# also always adds it. So we have to use a multi-pass setup.
pending = _PendingActions()
for action, info in actions:
if action == 'add':
path, file_id, kind, content = info
if kind == 'directory':
pending.to_add_directories.append((path, file_id))
else:
pending.to_add_files.append(path)
pending.to_add_file_ids.append(file_id)
pending.to_add_kinds.append(kind)
if content is not None:
pending.new_contents[file_id] = content
elif action == 'modify':
file_id, content = info
pending.new_contents[file_id] = content
elif action == 'unversion':
pending.to_unversion_ids.add(info)
elif action == 'rename':
from_relpath, to_relpath = info
pending.to_rename.append((from_relpath, to_relpath))
elif action == 'flush':
self._flush_pending(tree, pending)
pending = _PendingActions()
else:
raise ValueError('Unknown build action: "%s"' % (action,))
self._flush_pending(tree, pending)
return self._do_commit(tree, message=message, rev_id=revision_id,
timestamp=timestamp, timezone=timezone, committer=committer,
message_callback=message_callback)
finally:
tree.unlock()
def _flush_pending(self, tree, pending):
"""Flush the pending actions in 'pending', i.e. apply them to 'tree'."""
for path, file_id in pending.to_add_directories:
if path == '':
old_id = tree.path2id(path)
if old_id is not None and old_id in pending.to_unversion_ids:
# We're overwriting this path, no need to unversion
pending.to_unversion_ids.discard(old_id)
# Special case, because the path already exists
tree.add([path], [file_id], ['directory'])
else:
tree.mkdir(path, file_id)
for from_relpath, to_relpath in pending.to_rename:
tree.rename_one(from_relpath, to_relpath)
if pending.to_unversion_ids:
tree.unversion(pending.to_unversion_ids)
tree.add(pending.to_add_files, pending.to_add_file_ids, pending.to_add_kinds)
for file_id, content in pending.new_contents.iteritems():
tree.put_file_bytes_non_atomic(file_id, content)
def get_branch(self):
"""Return the branch created by the builder."""
return self._branch
class _PendingActions(object):
"""Pending actions for build_snapshot to take.
This is just a simple class to hold a bunch of the intermediate state of
build_snapshot in single object.
"""
def __init__(self):
self.to_add_directories = []
self.to_add_files = []
self.to_add_file_ids = []
self.to_add_kinds = []
self.new_contents = {}
self.to_unversion_ids = set()
self.to_rename = []
|