~bzr-pqm/bzr/bzr.dev

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
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
# Copyright (C) 2008, 2009, 2010 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

from __future__ import absolute_import

import errno
import re

from bzrlib.lazy_import import lazy_import
lazy_import(globals(), """
from bzrlib import (
    bencode,
    errors,
    merge,
    merge3,
    pack,
    transform,
)
""")


class ShelfCreator(object):
    """Create a transform to shelve objects and its inverse."""

    def __init__(self, work_tree, target_tree, file_list=None):
        """Constructor.

        :param work_tree: The working tree to apply changes to. This is not
            required to be locked - a tree_write lock will be taken out.
        :param target_tree: The tree to make the working tree more similar to.
            This is not required to be locked - a read_lock will be taken out.
        :param file_list: The files to make more similar to the target.
        """
        self.work_tree = work_tree
        self.work_transform = transform.TreeTransform(work_tree)
        try:
            self.target_tree = target_tree
            self.shelf_transform = transform.TransformPreview(self.target_tree)
            try:
                self.renames = {}
                self.creation = {}
                self.deletion = {}
                self.iter_changes = work_tree.iter_changes(
                    self.target_tree, specific_files=file_list)
            except:
                self.shelf_transform.finalize()
                raise
        except:
            self.work_transform.finalize()
            raise

    def iter_shelvable(self):
        """Iterable of tuples describing shelvable changes.

        As well as generating the tuples, this updates several members.
        Tuples may be::

           ('add file', file_id, work_kind, work_path)
           ('delete file', file_id, target_kind, target_path)
           ('rename', file_id, target_path, work_path)
           ('change kind', file_id, target_kind, work_kind, target_path)
           ('modify text', file_id)
           ('modify target', file_id, target_target, work_target)
        """
        for (file_id, paths, changed, versioned, parents, names, kind,
             executable) in self.iter_changes:
            # don't shelve add of tree root.  Working tree should never
            # lack roots, and bzr misbehaves when they do.
            # FIXME ADHB (2009-08-09): should still shelve adds of tree roots
            # when a tree root was deleted / renamed.
            if kind[0] is None and names[1] == '':
                continue
            # Also don't shelve deletion of tree root.
            if kind[1] is None and names[0] == '':
                continue
            if kind[0] is None or versioned[0] == False:
                self.creation[file_id] = (kind[1], names[1], parents[1],
                                          versioned)
                yield ('add file', file_id, kind[1], paths[1])
            elif kind[1] is None or versioned[0] == False:
                self.deletion[file_id] = (kind[0], names[0], parents[0],
                                          versioned)
                yield ('delete file', file_id, kind[0], paths[0])
            else:
                if names[0] != names[1] or parents[0] != parents[1]:
                    self.renames[file_id] = (names, parents)
                    yield ('rename', file_id) + paths

                if kind[0] != kind [1]:
                    yield ('change kind', file_id, kind[0], kind[1], paths[0])
                elif kind[0] == 'symlink':
                    t_target = self.target_tree.get_symlink_target(file_id)
                    w_target = self.work_tree.get_symlink_target(file_id)
                    yield ('modify target', file_id, paths[0], t_target,
                            w_target)
                elif changed:
                    yield ('modify text', file_id)

    def shelve_change(self, change):
        """Shelve a change in the iter_shelvable format."""
        if change[0] == 'rename':
            self.shelve_rename(change[1])
        elif change[0] == 'delete file':
            self.shelve_deletion(change[1])
        elif change[0] == 'add file':
            self.shelve_creation(change[1])
        elif change[0] in ('change kind', 'modify text'):
            self.shelve_content_change(change[1])
        elif change[0] == 'modify target':
            self.shelve_modify_target(change[1])
        else:
            raise ValueError('Unknown change kind: "%s"' % change[0])

    def shelve_all(self):
        """Shelve all changes."""
        for change in self.iter_shelvable():
            self.shelve_change(change)

    def shelve_rename(self, file_id):
        """Shelve a file rename.

        :param file_id: The file id of the file to shelve the renaming of.
        """
        names, parents = self.renames[file_id]
        w_trans_id = self.work_transform.trans_id_file_id(file_id)
        work_parent = self.work_transform.trans_id_file_id(parents[0])
        self.work_transform.adjust_path(names[0], work_parent, w_trans_id)

        s_trans_id = self.shelf_transform.trans_id_file_id(file_id)
        shelf_parent = self.shelf_transform.trans_id_file_id(parents[1])
        self.shelf_transform.adjust_path(names[1], shelf_parent, s_trans_id)

    def shelve_modify_target(self, file_id):
        """Shelve a change of symlink target.

        :param file_id: The file id of the symlink which changed target.
        :param new_target: The target that the symlink should have due
            to shelving.
        """
        new_target = self.target_tree.get_symlink_target(file_id)
        w_trans_id = self.work_transform.trans_id_file_id(file_id)
        self.work_transform.delete_contents(w_trans_id)
        self.work_transform.create_symlink(new_target, w_trans_id)

        old_target = self.work_tree.get_symlink_target(file_id)
        s_trans_id = self.shelf_transform.trans_id_file_id(file_id)
        self.shelf_transform.delete_contents(s_trans_id)
        self.shelf_transform.create_symlink(old_target, s_trans_id)

    def shelve_lines(self, file_id, new_lines):
        """Shelve text changes to a file, using provided lines.

        :param file_id: The file id of the file to shelve the text of.
        :param new_lines: The lines that the file should have due to shelving.
        """
        w_trans_id = self.work_transform.trans_id_file_id(file_id)
        self.work_transform.delete_contents(w_trans_id)
        self.work_transform.create_file(new_lines, w_trans_id)

        s_trans_id = self.shelf_transform.trans_id_file_id(file_id)
        self.shelf_transform.delete_contents(s_trans_id)
        inverse_lines = self._inverse_lines(new_lines, file_id)
        self.shelf_transform.create_file(inverse_lines, s_trans_id)

    @staticmethod
    def _content_from_tree(tt, tree, file_id):
        trans_id = tt.trans_id_file_id(file_id)
        tt.delete_contents(trans_id)
        transform.create_from_tree(tt, trans_id, tree, file_id)

    def shelve_content_change(self, file_id):
        """Shelve a kind change or binary file content change.

        :param file_id: The file id of the file to shelve the content change
            of.
        """
        self._content_from_tree(self.work_transform, self.target_tree, file_id)
        self._content_from_tree(self.shelf_transform, self.work_tree, file_id)

    def shelve_creation(self, file_id):
        """Shelve creation of a file.

        This handles content and inventory id.
        :param file_id: The file_id of the file to shelve creation of.
        """
        kind, name, parent, versioned = self.creation[file_id]
        version = not versioned[0]
        self._shelve_creation(self.work_tree, file_id, self.work_transform,
                              self.shelf_transform, kind, name, parent,
                              version)

    def shelve_deletion(self, file_id):
        """Shelve deletion of a file.

        This handles content and inventory id.
        :param file_id: The file_id of the file to shelve deletion of.
        """
        kind, name, parent, versioned = self.deletion[file_id]
        existing_path = self.target_tree.id2path(file_id)
        if not self.work_tree.has_filename(existing_path):
            existing_path = None
        version = not versioned[1]
        self._shelve_creation(self.target_tree, file_id, self.shelf_transform,
                              self.work_transform, kind, name, parent,
                              version, existing_path=existing_path)

    def _shelve_creation(self, tree, file_id, from_transform, to_transform,
                         kind, name, parent, version, existing_path=None):
        w_trans_id = from_transform.trans_id_file_id(file_id)
        if parent is not None and kind is not None:
            from_transform.delete_contents(w_trans_id)
        from_transform.unversion_file(w_trans_id)

        if existing_path is not None:
            s_trans_id = to_transform.trans_id_tree_path(existing_path)
        else:
            s_trans_id = to_transform.trans_id_file_id(file_id)
        if parent is not None:
            s_parent_id = to_transform.trans_id_file_id(parent)
            to_transform.adjust_path(name, s_parent_id, s_trans_id)
            if existing_path is None:
                if kind is None:
                    to_transform.create_file('', s_trans_id)
                else:
                    transform.create_from_tree(to_transform, s_trans_id,
                                               tree, file_id)
        if version:
            to_transform.version_file(file_id, s_trans_id)

    def _inverse_lines(self, new_lines, file_id):
        """Produce a version with only those changes removed from new_lines."""
        target_lines = self.target_tree.get_file_lines(file_id)
        work_lines = self.work_tree.get_file_lines(file_id)
        return merge3.Merge3(new_lines, target_lines, work_lines).merge_lines()

    def finalize(self):
        """Release all resources used by this ShelfCreator."""
        self.work_transform.finalize()
        self.shelf_transform.finalize()

    def transform(self):
        """Shelve changes from working tree."""
        self.work_transform.apply()

    def write_shelf(self, shelf_file, message=None):
        """Serialize the shelved changes to a file.

        :param shelf_file: A file-like object to write the shelf to.
        :param message: An optional message describing the shelved changes.
        :return: the filename of the written file.
        """
        transform.resolve_conflicts(self.shelf_transform)
        serializer = pack.ContainerSerialiser()
        shelf_file.write(serializer.begin())
        metadata = {
            'revision_id': self.target_tree.get_revision_id(),
        }
        if message is not None:
            metadata['message'] = message.encode('utf-8')
        shelf_file.write(serializer.bytes_record(
            bencode.bencode(metadata), (('metadata',),)))
        for bytes in self.shelf_transform.serialize(serializer):
            shelf_file.write(bytes)
        shelf_file.write(serializer.end())


class Unshelver(object):
    """Unshelve shelved changes."""

    def __init__(self, tree, base_tree, transform, message):
        """Constructor.

        :param tree: The tree to apply the changes to.
        :param base_tree: The basis to apply the tranform to.
        :param message: A message from the shelved transform.
        """
        self.tree = tree
        self.base_tree = base_tree
        self.transform = transform
        self.message = message

    @staticmethod
    def iter_records(shelf_file):
        parser = pack.ContainerPushParser()
        parser.accept_bytes(shelf_file.read())
        return iter(parser.read_pending_records())

    @staticmethod
    def parse_metadata(records):
        names, metadata_bytes = records.next()
        if names[0] != ('metadata',):
            raise errors.ShelfCorrupt
        metadata = bencode.bdecode(metadata_bytes)
        message = metadata.get('message')
        if message is not None:
            metadata['message'] = message.decode('utf-8')
        return metadata

    @classmethod
    def from_tree_and_shelf(klass, tree, shelf_file):
        """Create an Unshelver from a tree and a shelf file.

        :param tree: The tree to apply shelved changes to.
        :param shelf_file: A file-like object containing shelved changes.
        :return: The Unshelver.
        """
        records = klass.iter_records(shelf_file)
        metadata = klass.parse_metadata(records)
        base_revision_id = metadata['revision_id']
        try:
            base_tree = tree.revision_tree(base_revision_id)
        except errors.NoSuchRevisionInTree:
            base_tree = tree.branch.repository.revision_tree(base_revision_id)
        tt = transform.TransformPreview(base_tree)
        tt.deserialize(records)
        return klass(tree, base_tree, tt, metadata.get('message'))

    def make_merger(self, task=None):
        """Return a merger that can unshelve the changes."""
        target_tree = self.transform.get_preview_tree()
        merger = merge.Merger.from_uncommitted(self.tree, target_tree,
            task, self.base_tree)
        merger.merge_type = merge.Merge3Merger
        return merger

    def finalize(self):
        """Release all resources held by this Unshelver."""
        self.transform.finalize()


class ShelfManager(object):
    """Maintain a list of shelved changes."""

    def __init__(self, tree, transport):
        self.tree = tree
        self.transport = transport.clone('shelf')
        self.transport.ensure_base()

    def get_shelf_filename(self, shelf_id):
        return 'shelf-%d' % shelf_id

    def get_shelf_ids(self, filenames):
        matcher = re.compile('shelf-([1-9][0-9]*)')
        shelf_ids = []
        for filename in filenames:
            match = matcher.match(filename)
            if match is not None:
                shelf_ids.append(int(match.group(1)))
        return shelf_ids

    def new_shelf(self):
        """Return a file object and id for a new set of shelved changes."""
        last_shelf = self.last_shelf()
        if last_shelf is None:
            next_shelf = 1
        else:
            next_shelf = last_shelf + 1
        filename = self.get_shelf_filename(next_shelf)
        shelf_file = open(self.transport.local_abspath(filename), 'wb')
        return next_shelf, shelf_file

    def shelve_changes(self, creator, message=None):
        """Store the changes in a ShelfCreator on a shelf."""
        next_shelf, shelf_file = self.new_shelf()
        try:
            creator.write_shelf(shelf_file, message)
        finally:
            shelf_file.close()
        creator.transform()
        return next_shelf

    def read_shelf(self, shelf_id):
        """Return the file associated with a shelf_id for reading.

        :param shelf_id: The id of the shelf to retrive the file for.
        """
        filename = self.get_shelf_filename(shelf_id)
        try:
            return open(self.transport.local_abspath(filename), 'rb')
        except IOError, e:
            if e.errno != errno.ENOENT:
                raise
            from bzrlib import errors
            raise errors.NoSuchShelfId(shelf_id)

    def get_unshelver(self, shelf_id):
        """Return an unshelver for a given shelf_id.

        :param shelf_id: The shelf id to return the unshelver for.
        """
        shelf_file = self.read_shelf(shelf_id)
        try:
            return Unshelver.from_tree_and_shelf(self.tree, shelf_file)
        finally:
            shelf_file.close()

    def get_metadata(self, shelf_id):
        """Return the metadata associated with a given shelf_id."""
        shelf_file = self.read_shelf(shelf_id)
        try:
            records = Unshelver.iter_records(shelf_file)
        finally:
            shelf_file.close()
        return Unshelver.parse_metadata(records)

    def delete_shelf(self, shelf_id):
        """Delete the shelved changes for a given id.

        :param shelf_id: id of the shelved changes to delete.
        """
        filename = self.get_shelf_filename(shelf_id)
        self.transport.delete(filename)

    def active_shelves(self):
        """Return a list of shelved changes."""
        active = self.get_shelf_ids(self.transport.list_dir('.'))
        active.sort()
        return active

    def last_shelf(self):
        """Return the id of the last-created shelved change."""
        active = self.active_shelves()
        if len(active) > 0:
            return active[-1]
        else:
            return None