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
303
304
305
306
307
308
309
310
311
312
313
314
|
# Copyright (C) 2006 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
"""MemoryTree object.
See MemoryTree for more details.
"""
import os
from bzrlib import (
errors,
mutabletree,
revision as _mod_revision,
)
from bzrlib.decorators import needs_read_lock
from bzrlib.osutils import sha_file
from bzrlib.mutabletree import needs_tree_write_lock
from bzrlib.transport.memory import MemoryTransport
class MemoryTree(mutabletree.MutableTree):
"""A MemoryTree is a specialisation of MutableTree.
It maintains nearly no state outside of read_lock and write_lock
transactions. (it keeps a reference to the branch, and its last-revision
only).
"""
def __init__(self, branch, revision_id):
"""Construct a MemoryTree for branch using revision_id."""
self.branch = branch
self.bzrdir = branch.bzrdir
self._branch_revision_id = revision_id
self._locks = 0
self._lock_mode = None
@needs_tree_write_lock
def _add(self, files, ids, kinds):
"""See MutableTree._add."""
for f, file_id, kind in zip(files, ids, kinds):
if kind is None:
kind = 'file'
if file_id is None:
self._inventory.add_path(f, kind=kind)
else:
self._inventory.add_path(f, kind=kind, file_id=file_id)
def basis_tree(self):
"""See Tree.basis_tree()."""
return self._basis_tree
@staticmethod
def create_on_branch(branch):
"""Create a MemoryTree for branch, using the last-revision of branch."""
revision_id = _mod_revision.ensure_null(branch.last_revision())
return MemoryTree(branch, revision_id)
def _gather_kinds(self, files, kinds):
"""See MutableTree._gather_kinds.
This implementation does not care about the file kind of
missing files, so is a no-op.
"""
def get_file(self, file_id, path=None):
"""See Tree.get_file."""
if path is None:
path = self.id2path(file_id)
return self._file_transport.get(path)
def get_file_sha1(self, file_id, path=None, stat_value=None):
"""See Tree.get_file_sha1()."""
if path is None:
path = self.id2path(file_id)
stream = self._file_transport.get(path)
return sha_file(stream)
def get_root_id(self):
return self.path2id('')
def _comparison_data(self, entry, path):
"""See Tree._comparison_data."""
if entry is None:
return None, False, None
return entry.kind, entry.executable, None
@needs_tree_write_lock
def rename_one(self, from_rel, to_rel):
file_id = self.path2id(from_rel)
to_dir, to_tail = os.path.split(to_rel)
to_parent_id = self.path2id(to_dir)
self._file_transport.move(from_rel, to_rel)
self._inventory.rename(file_id, to_parent_id, to_tail)
def path_content_summary(self, path):
"""See Tree.path_content_summary."""
id = self.path2id(path)
if id is None:
return 'missing', None, None, None
kind = self.kind(id)
if kind == 'file':
bytes = self._file_transport.get_bytes(path)
size = len(bytes)
executable = self._inventory[id].executable
sha1 = None # no stat cache
return (kind, size, executable, sha1)
elif kind == 'directory':
# memory tree does not support nested trees yet.
return kind, None, None, None
elif kind == 'symlink':
raise NotImplementedError('symlink support')
else:
raise NotImplementedError('unknown kind')
def _file_size(self, entry, stat_value):
"""See Tree._file_size."""
if entry is None:
return 0
return entry.text_size
@needs_read_lock
def get_parent_ids(self):
"""See Tree.get_parent_ids.
This implementation returns the current cached value from
self._parent_ids.
"""
return list(self._parent_ids)
def has_filename(self, filename):
"""See Tree.has_filename()."""
return self._file_transport.has(filename)
def is_executable(self, file_id, path=None):
return self._inventory[file_id].executable
def kind(self, file_id):
return self._inventory[file_id].kind
def mkdir(self, path, file_id=None):
"""See MutableTree.mkdir()."""
self.add(path, file_id, 'directory')
if file_id is None:
file_id = self.path2id(path)
self._file_transport.mkdir(path)
return file_id
@needs_read_lock
def last_revision(self):
"""See MutableTree.last_revision."""
return self._branch_revision_id
def lock_read(self):
"""Lock the memory tree for reading.
This triggers population of data from the branch for its revision.
"""
self._locks += 1
try:
if self._locks == 1:
self.branch.lock_read()
self._lock_mode = "r"
self._populate_from_branch()
except:
self._locks -= 1
raise
def lock_tree_write(self):
"""See MutableTree.lock_tree_write()."""
self._locks += 1
try:
if self._locks == 1:
self.branch.lock_read()
self._lock_mode = "w"
self._populate_from_branch()
elif self._lock_mode == "r":
raise errors.ReadOnlyError(self)
except:
self._locks -= 1
raise
def lock_write(self):
"""See MutableTree.lock_write()."""
self._locks += 1
try:
if self._locks == 1:
self.branch.lock_write()
self._lock_mode = "w"
self._populate_from_branch()
elif self._lock_mode == "r":
raise errors.ReadOnlyError(self)
except:
self._locks -= 1
raise
def _populate_from_branch(self):
"""Populate the in-tree state from the branch."""
self._set_basis()
if self._branch_revision_id == _mod_revision.NULL_REVISION:
self._parent_ids = []
else:
self._parent_ids = [self._branch_revision_id]
self._inventory = self._basis_tree._inventory._get_mutable_inventory()
self._file_transport = MemoryTransport()
# TODO copy the revision trees content, or do it lazy, or something.
inventory_entries = self._inventory.iter_entries()
for path, entry in inventory_entries:
if path == '':
continue
if entry.kind == 'directory':
self._file_transport.mkdir(path)
elif entry.kind == 'file':
self._file_transport.put_file(path,
self._basis_tree.get_file(entry.file_id))
else:
raise NotImplementedError(self._populate_from_branch)
def put_file_bytes_non_atomic(self, file_id, bytes):
"""See MutableTree.put_file_bytes_non_atomic."""
self._file_transport.put_bytes(self.id2path(file_id), bytes)
def unlock(self):
"""Release a lock.
This frees all cached state when the last lock context for the tree is
left.
"""
if self._locks == 1:
self._basis_tree = None
self._parent_ids = []
self._inventory = None
try:
self.branch.unlock()
finally:
self._locks = 0
self._lock_mode = None
else:
self._locks -= 1
@needs_tree_write_lock
def unversion(self, file_ids):
"""Remove the file ids in file_ids from the current versioned set.
When a file_id is unversioned, all of its children are automatically
unversioned.
:param file_ids: The file ids to stop versioning.
:raises: NoSuchId if any fileid is not currently versioned.
"""
# XXX: This should be in mutabletree, but the inventory-save action
# is not relevant to memory tree. Until that is done in unlock by
# working tree, we cannot share the implementation.
for file_id in file_ids:
if self._inventory.has_id(file_id):
self._inventory.remove_recursive_id(file_id)
else:
raise errors.NoSuchId(self, file_id)
def set_parent_ids(self, revision_ids, allow_leftmost_as_ghost=False):
"""See MutableTree.set_parent_trees()."""
for revision_id in revision_ids:
_mod_revision.check_not_reserved_id(revision_id)
if len(revision_ids) == 0:
self._parent_ids = []
self._branch_revision_id = _mod_revision.NULL_REVISION
else:
self._parent_ids = revision_ids
self._branch_revision_id = revision_ids[0]
self._allow_leftmost_as_ghost = allow_leftmost_as_ghost
self._set_basis()
def _set_basis(self):
try:
self._basis_tree = self.branch.repository.revision_tree(
self._branch_revision_id)
except errors.NoSuchRevision:
if self._allow_leftmost_as_ghost:
self._basis_tree = self.branch.repository.revision_tree(
_mod_revision.NULL_REVISION)
else:
raise
def set_parent_trees(self, parents_list, allow_leftmost_as_ghost=False):
"""See MutableTree.set_parent_trees()."""
if len(parents_list) == 0:
self._parent_ids = []
self._basis_tree = self.branch.repository.revision_tree(
_mod_revision.NULL_REVISION)
else:
if parents_list[0][1] is None and not allow_leftmost_as_ghost:
# a ghost in the left most parent
raise errors.GhostRevisionUnusableHere(parents_list[0][0])
self._parent_ids = [parent_id for parent_id, tree in parents_list]
if parents_list[0][1] is None or parents_list[0][1] == 'null:':
self._basis_tree = self.branch.repository.revision_tree(
_mod_revision.NULL_REVISION)
else:
self._basis_tree = parents_list[0][1]
self._branch_revision_id = parents_list[0][0]
|