1
# Copyright (C) 2007, 2008, 2009 Canonical Ltd
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
"""Utility for create branches with particular contents."""
27
class BranchBuilder(object):
28
r"""A BranchBuilder aids creating Branches with particular shapes.
30
The expected way to use BranchBuilder is to construct a
31
BranchBuilder on the transport you want your branch on, and then call
32
appropriate build_ methods on it to get the shape of history you want.
34
This is meant as a helper for the test suite, not as a general class for
39
>>> from bzrlib.transport.memory import MemoryTransport
40
>>> builder = BranchBuilder(MemoryTransport("memory:///"))
41
>>> builder.start_series()
42
>>> builder.build_snapshot('rev-id', None, [
43
... ('add', ('', 'root-id', 'directory', '')),
44
... ('add', ('filename', 'f-id', 'file', 'content\n'))])
46
>>> builder.build_snapshot('rev2-id', ['rev-id'],
47
... [('modify', ('f-id', 'new-content\n'))])
49
>>> builder.finish_series()
50
>>> branch = builder.get_branch()
52
:ivar _tree: This is a private member which is not meant to be modified by
53
users of this class. While a 'series' is in progress, it should hold a
54
MemoryTree with the contents of the last commit (ready to be modified
55
by the next build_snapshot command) with a held write lock. Outside of
56
a series in progress, it should be None.
59
def __init__(self, transport=None, format=None, branch=None):
60
"""Construct a BranchBuilder on transport.
62
:param transport: The transport the branch should be created on.
63
If the path of the transport does not exist but its parent does
65
:param format: Either a BzrDirFormat, or the name of a format in the
66
bzrdir format registry for the branch to be built.
67
:param branch: An already constructed branch to use. This param is
68
mutually exclusive with the transport and format params.
70
if branch is not None:
71
if format is not None:
73
"branch and format kwargs are mutually exclusive")
74
if transport is not None:
76
"branch and transport kwargs are mutually exclusive")
79
if not transport.has('.'):
83
if isinstance(format, str):
84
format = bzrdir.format_registry.make_bzrdir(format)
85
self._branch = bzrdir.BzrDir.create_branch_convenience(
86
transport.base, format=format, force_new_tree=False)
89
def build_commit(self, **commit_kwargs):
90
"""Build a commit on the branch.
92
This makes a commit with no real file content for when you only want
93
to look at the revision graph structure.
95
:param commit_kwargs: Arguments to pass through to commit, such as
98
tree = memorytree.MemoryTree.create_on_branch(self._branch)
102
return self._do_commit(tree, **commit_kwargs)
106
def _do_commit(self, tree, message=None, **kwargs):
107
reporter = commit.NullCommitReporter()
109
message = u'commit %d' % (self._branch.revno() + 1,)
110
return tree.commit(message,
114
def _move_branch_pointer(self, new_revision_id,
115
allow_leftmost_as_ghost=False):
116
"""Point self._branch to a different revision id."""
117
self._branch.lock_write()
119
# We don't seem to have a simple set_last_revision(), so we
121
cur_revno, cur_revision_id = self._branch.last_revision_info()
123
g = self._branch.repository.get_graph()
124
new_revno = g.find_distance_to_null(new_revision_id,
125
[(cur_revision_id, cur_revno)])
126
self._branch.set_last_revision_info(new_revno, new_revision_id)
127
except errors.GhostRevisionsHaveNoRevno:
128
if not allow_leftmost_as_ghost:
132
self._branch.unlock()
133
if self._tree is not None:
134
# We are currently processing a series, but when switching branch
135
# pointers, it is easiest to just create a new memory tree.
136
# That way we are sure to have the right files-on-disk
137
# We are cheating a little bit here, and locking the new tree
138
# before the old tree is unlocked. But that way the branch stays
140
new_tree = memorytree.MemoryTree.create_on_branch(self._branch)
141
new_tree.lock_write()
143
self._tree = new_tree
145
def start_series(self):
146
"""We will be creating a series of commits.
148
This allows us to hold open the locks while we are processing.
150
Make sure to call 'finish_series' when you are done.
152
if self._tree is not None:
153
raise AssertionError('You cannot start a new series while a'
154
' series is already going.')
155
self._tree = memorytree.MemoryTree.create_on_branch(self._branch)
156
self._tree.lock_write()
158
def finish_series(self):
159
"""Call this after start_series to unlock the various objects."""
163
def build_snapshot(self, revision_id, parent_ids, actions,
164
message=None, timestamp=None, allow_leftmost_as_ghost=False,
166
"""Build a commit, shaped in a specific way.
168
:param revision_id: The handle for the new commit, can be None
169
:param parent_ids: A list of parent_ids to use for the commit.
170
It can be None, which indicates to use the last commit.
171
:param actions: A list of actions to perform. Supported actions are:
172
('add', ('path', 'file-id', 'kind', 'content' or None))
173
('modify', ('file-id', 'new-content'))
174
('unversion', 'file-id')
175
('rename', ('orig-path', 'new-path'))
176
:param message: An optional commit message, if not supplied, a default
177
commit message will be written.
178
:param timestamp: If non-None, set the timestamp of the commit to this
180
:param committer: An optional username to use for commit
181
:param allow_leftmost_as_ghost: True if the leftmost parent should be
182
permitted to be a ghost.
183
:return: The revision_id of the new commit
185
if parent_ids is not None:
186
base_id = parent_ids[0]
187
if base_id != self._branch.last_revision():
188
self._move_branch_pointer(base_id,
189
allow_leftmost_as_ghost=allow_leftmost_as_ghost)
191
if self._tree is not None:
194
tree = memorytree.MemoryTree.create_on_branch(self._branch)
197
if parent_ids is not None:
198
tree.set_parent_ids(parent_ids,
199
allow_leftmost_as_ghost=allow_leftmost_as_ghost)
200
# Unfortunately, MemoryTree.add(directory) just creates an
201
# inventory entry. And the only public function to create a
202
# directory is MemoryTree.mkdir() which creates the directory, but
203
# also always adds it. So we have to use a multi-pass setup.
204
to_add_directories = []
209
to_unversion_ids = []
211
for action, info in actions:
213
path, file_id, kind, content = info
214
if kind == 'directory':
215
to_add_directories.append((path, file_id))
217
to_add_files.append(path)
218
to_add_file_ids.append(file_id)
219
to_add_kinds.append(kind)
220
if content is not None:
221
new_contents[file_id] = content
222
elif action == 'modify':
223
file_id, content = info
224
new_contents[file_id] = content
225
elif action == 'unversion':
226
to_unversion_ids.append(info)
227
elif action == 'rename':
228
from_relpath, to_relpath = info
229
to_rename.append((from_relpath, to_relpath))
231
raise ValueError('Unknown build action: "%s"' % (action,))
233
tree.unversion(to_unversion_ids)
234
for path, file_id in to_add_directories:
236
# Special case, because the path already exists
237
tree.add([path], [file_id], ['directory'])
239
tree.mkdir(path, file_id)
240
for from_relpath, to_relpath in to_rename:
241
tree.rename_one(from_relpath, to_relpath)
242
tree.add(to_add_files, to_add_file_ids, to_add_kinds)
243
for file_id, content in new_contents.iteritems():
244
tree.put_file_bytes_non_atomic(file_id, content)
245
return self._do_commit(tree, message=message, rev_id=revision_id,
246
timestamp=timestamp, committer=committer)
250
def get_branch(self):
251
"""Return the branch created by the builder."""
added
removed
bzrlib/branchbuilder.py
