~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
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
# Copyright (C) 2007 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


from StringIO import StringIO
import re

from bzrlib import (
    branch as _mod_branch,
    diff,
    errors,
    gpg,
    registry,
    revision as _mod_revision,
    rio,
    testament,
    timestamp,
    )
from bzrlib.bundle import (
    serializer as bundle_serializer,
    )
from bzrlib.email_message import EmailMessage


class _BaseMergeDirective(object):

    def __init__(self, revision_id, testament_sha1, time, timezone,
                 target_branch, patch=None, source_branch=None, message=None,
                 bundle=None):
        """Constructor.

        :param revision_id: The revision to merge
        :param testament_sha1: The sha1 of the testament of the revision to
            merge.
        :param time: The current POSIX timestamp time
        :param timezone: The timezone offset
        :param target_branch: The branch to apply the merge to
        :param patch: The text of a diff or bundle
        :param source_branch: A public location to merge the revision from
        :param message: The message to use when committing this merge
        """
        self.revision_id = revision_id
        self.testament_sha1 = testament_sha1
        self.time = time
        self.timezone = timezone
        self.target_branch = target_branch
        self.patch = patch
        self.source_branch = source_branch
        self.message = message

    def _to_lines(self, base_revision=False):
        """Serialize as a list of lines

        :return: a list of lines
        """
        time_str = timestamp.format_patch_date(self.time, self.timezone)
        stanza = rio.Stanza(revision_id=self.revision_id, timestamp=time_str,
                            target_branch=self.target_branch,
                            testament_sha1=self.testament_sha1)
        for key in ('source_branch', 'message'):
            if self.__dict__[key] is not None:
                stanza.add(key, self.__dict__[key])
        if base_revision:
            stanza.add('base_revision_id', self.base_revision_id)
        lines = ['# ' + self._format_string + '\n']
        lines.extend(rio.to_patch_lines(stanza))
        lines.append('# \n')
        return lines

    @classmethod
    def from_objects(klass, repository, revision_id, time, timezone,
                 target_branch, patch_type='bundle',
                 local_target_branch=None, public_branch=None, message=None):
        """Generate a merge directive from various objects

        :param repository: The repository containing the revision
        :param revision_id: The revision to merge
        :param time: The POSIX timestamp of the date the request was issued.
        :param timezone: The timezone of the request
        :param target_branch: The url of the branch to merge into
        :param patch_type: 'bundle', 'diff' or None, depending on the type of
            patch desired.
        :param local_target_branch: a local copy of the target branch
        :param public_branch: location of a public branch containing the target
            revision.
        :param message: Message to use when committing the merge
        :return: The merge directive

        The public branch is always used if supplied.  If the patch_type is
        not 'bundle', the public branch must be supplied, and will be verified.

        If the message is not supplied, the message from revision_id will be
        used for the commit.
        """
        t_revision_id = revision_id
        if revision_id == _mod_revision.NULL_REVISION:
            t_revision_id = None
        t = testament.StrictTestament3.from_revision(repository, t_revision_id)
        submit_branch = _mod_branch.Branch.open(target_branch)
        if submit_branch.get_public_branch() is not None:
            target_branch = submit_branch.get_public_branch()
        if patch_type is None:
            patch = None
        else:
            submit_revision_id = submit_branch.last_revision()
            submit_revision_id = _mod_revision.ensure_null(submit_revision_id)
            repository.fetch(submit_branch.repository, submit_revision_id)
            graph = repository.get_graph()
            ancestor_id = graph.find_unique_lca(revision_id,
                                                submit_revision_id)
            type_handler = {'bundle': klass._generate_bundle,
                            'diff': klass._generate_diff,
                            None: lambda x, y, z: None }
            patch = type_handler[patch_type](repository, revision_id,
                                             ancestor_id)

        if public_branch is not None and patch_type != 'bundle':
            public_branch_obj = _mod_branch.Branch.open(public_branch)
            if not public_branch_obj.repository.has_revision(revision_id):
                raise errors.PublicBranchOutOfDate(public_branch,
                                                   revision_id)

        return klass(revision_id, t.as_sha1(), time, timezone, target_branch,
            patch, patch_type, public_branch, message)

    def get_disk_name(self, branch):
        """Generate a suitable basename for storing this directive on disk

        :param branch: The Branch this merge directive was generated fro
        :return: A string
        """
        revno, revision_id = branch.last_revision_info()
        if self.revision_id == revision_id:
            revno = [revno]
        else:
            revno = branch.get_revision_id_to_revno_map().get(self.revision_id,
                ['merge'])
        return '%s-%s' % (branch.nick, '.'.join(str(n) for n in revno))

    @staticmethod
    def _generate_diff(repository, revision_id, ancestor_id):
        tree_1 = repository.revision_tree(ancestor_id)
        tree_2 = repository.revision_tree(revision_id)
        s = StringIO()
        diff.show_diff_trees(tree_1, tree_2, s, old_label='', new_label='')
        return s.getvalue()

    @staticmethod
    def _generate_bundle(repository, revision_id, ancestor_id):
        s = StringIO()
        bundle_serializer.write_bundle(repository, revision_id,
                                       ancestor_id, s)
        return s.getvalue()

    def to_signed(self, branch):
        """Serialize as a signed string.

        :param branch: The source branch, to get the signing strategy
        :return: a string
        """
        my_gpg = gpg.GPGStrategy(branch.get_config())
        return my_gpg.sign(''.join(self.to_lines()))

    def to_email(self, mail_to, branch, sign=False):
        """Serialize as an email message.

        :param mail_to: The address to mail the message to
        :param branch: The source branch, to get the signing strategy and
            source email address
        :param sign: If True, gpg-sign the email
        :return: an email message
        """
        mail_from = branch.get_config().username()
        if self.message is not None:
            subject = self.message
        else:
            revision = branch.repository.get_revision(self.revision_id)
            subject = revision.message
        if sign:
            body = self.to_signed(branch)
        else:
            body = ''.join(self.to_lines())
        message = EmailMessage(mail_from, mail_to, subject, body)
        return message

    def install_revisions(self, target_repo):
        """Install revisions and return the target revision"""
        if not target_repo.has_revision(self.revision_id):
            if self.patch_type == 'bundle':
                info = bundle_serializer.read_bundle(
                    StringIO(self.get_raw_bundle()))
                # We don't use the bundle's target revision, because
                # MergeDirective.revision_id is authoritative.
                try:
                    info.install_revisions(target_repo, stream_input=False)
                except errors.RevisionNotPresent:
                    # At least one dependency isn't present.  Try installing
                    # missing revisions from the submit branch
                    submit_branch = _mod_branch.Branch.open(self.target_branch)
                    missing_revisions = []
                    bundle_revisions = set(r.revision_id for r in
                                           info.real_revisions)
                    for revision in info.real_revisions:
                        for parent_id in revision.parent_ids:
                            if (parent_id not in bundle_revisions and
                                not target_repo.has_revision(parent_id)):
                                missing_revisions.append(parent_id)
                    # reverse missing revisions to try to get heads first
                    unique_missing = []
                    unique_missing_set = set()
                    for revision in reversed(missing_revisions):
                        if revision in unique_missing_set:
                            continue
                        unique_missing.append(revision)
                        unique_missing_set.add(revision)
                    for missing_revision in unique_missing:
                        target_repo.fetch(submit_branch.repository,
                                          missing_revision)
                    info.install_revisions(target_repo, stream_input=False)
            else:
                source_branch = _mod_branch.Branch.open(self.source_branch)
                target_repo.fetch(source_branch.repository, self.revision_id)
        return self.revision_id


class MergeDirective(_BaseMergeDirective):

    """A request to perform a merge into a branch.

    Designed to be serialized and mailed.  It provides all the information
    needed to perform a merge automatically, by providing at minimum a revision
    bundle or the location of a branch.

    The serialization format is robust against certain common forms of
    deterioration caused by mailing.

    The format is also designed to be patch-compatible.  If the directive
    includes a diff or revision bundle, it should be possible to apply it
    directly using the standard patch program.
    """

    _format_string = 'Bazaar merge directive format 1'

    def __init__(self, revision_id, testament_sha1, time, timezone,
                 target_branch, patch=None, patch_type=None,
                 source_branch=None, message=None, bundle=None):
        """Constructor.

        :param revision_id: The revision to merge
        :param testament_sha1: The sha1 of the testament of the revision to
            merge.
        :param time: The current POSIX timestamp time
        :param timezone: The timezone offset
        :param target_branch: The branch to apply the merge to
        :param patch: The text of a diff or bundle
        :param patch_type: None, "diff" or "bundle", depending on the contents
            of patch
        :param source_branch: A public location to merge the revision from
        :param message: The message to use when committing this merge
        """
        _BaseMergeDirective.__init__(self, revision_id, testament_sha1, time,
            timezone, target_branch, patch, source_branch, message)
        assert patch_type in (None, 'diff', 'bundle'), patch_type
        if patch_type != 'bundle' and source_branch is None:
            raise errors.NoMergeSource()
        if patch_type is not None and patch is None:
            raise errors.PatchMissing(patch_type)
        self.patch_type = patch_type

    def clear_payload(self):
        self.patch = None
        self.patch_type = None

    def get_raw_bundle(self):
        return self.bundle

    def _bundle(self):
        if self.patch_type == 'bundle':
            return self.patch
        else:
            return None

    bundle = property(_bundle)

    @classmethod
    def from_lines(klass, lines):
        """Deserialize a MergeRequest from an iterable of lines

        :param lines: An iterable of lines
        :return: a MergeRequest
        """
        line_iter = iter(lines)
        for line in line_iter:
            if line.startswith('# Bazaar merge directive format '):
                break
        else:
            if len(lines) > 0:
                raise errors.NotAMergeDirective(lines[0])
            else:
                raise errors.NotAMergeDirective('')
        return _format_registry.get(line[2:].rstrip())._from_lines(line_iter)

    @classmethod
    def _from_lines(klass, line_iter):
        stanza = rio.read_patch_stanza(line_iter)
        patch_lines = list(line_iter)
        if len(patch_lines) == 0:
            patch = None
            patch_type = None
        else:
            patch = ''.join(patch_lines)
            try:
                bundle_serializer.read_bundle(StringIO(patch))
            except (errors.NotABundle, errors.BundleNotSupported,
                    errors.BadBundle):
                patch_type = 'diff'
            else:
                patch_type = 'bundle'
        time, timezone = timestamp.parse_patch_date(stanza.get('timestamp'))
        kwargs = {}
        for key in ('revision_id', 'testament_sha1', 'target_branch',
                    'source_branch', 'message'):
            try:
                kwargs[key] = stanza.get(key)
            except KeyError:
                pass
        kwargs['revision_id'] = kwargs['revision_id'].encode('utf-8')
        return MergeDirective(time=time, timezone=timezone,
                              patch_type=patch_type, patch=patch, **kwargs)

    def to_lines(self):
        lines = self._to_lines()
        if self.patch is not None:
            lines.extend(self.patch.splitlines(True))
        return lines

    @staticmethod
    def _generate_bundle(repository, revision_id, ancestor_id):
        s = StringIO()
        bundle_serializer.write_bundle(repository, revision_id,
                                       ancestor_id, s, '0.9')
        return s.getvalue()

    def get_merge_request(self, repository):
        """Provide data for performing a merge

        Returns suggested base, suggested target, and patch verification status
        """
        return None, self.revision_id, 'inapplicable'


class MergeDirective2(_BaseMergeDirective):

    _format_string = 'Bazaar merge directive format 2 (Bazaar 0.90)'

    def __init__(self, revision_id, testament_sha1, time, timezone,
                 target_branch, patch=None, source_branch=None, message=None,
                 bundle=None, base_revision_id=None):
        if source_branch is None and bundle is None:
            raise errors.NoMergeSource()
        _BaseMergeDirective.__init__(self, revision_id, testament_sha1, time,
            timezone, target_branch, patch, source_branch, message)
        self.bundle = bundle
        self.base_revision_id = base_revision_id

    def _patch_type(self):
        if self.bundle is not None:
            return 'bundle'
        elif self.patch is not None:
            return 'diff'
        else:
            return None

    patch_type = property(_patch_type)

    def clear_payload(self):
        self.patch = None
        self.bundle = None

    def get_raw_bundle(self):
        if self.bundle is None:
            return None
        else:
            return self.bundle.decode('base-64')

    @classmethod
    def _from_lines(klass, line_iter):
        stanza = rio.read_patch_stanza(line_iter)
        patch = None
        bundle = None
        try:
            start = line_iter.next()
        except StopIteration:
            pass
        else:
            if start.startswith('# Begin patch'):
                patch_lines = []
                for line in line_iter:
                    if line.startswith('# Begin bundle'):
                        start = line
                        break
                    patch_lines.append(line)
                else:
                    start = None
                patch = ''.join(patch_lines)
            if start is not None:
                if start.startswith('# Begin bundle'):
                    bundle = ''.join(line_iter)
                else:
                    raise errors.IllegalMergeDirectivePayload(start)
        time, timezone = timestamp.parse_patch_date(stanza.get('timestamp'))
        kwargs = {}
        for key in ('revision_id', 'testament_sha1', 'target_branch',
                    'source_branch', 'message', 'base_revision_id'):
            try:
                kwargs[key] = stanza.get(key)
            except KeyError:
                pass
        kwargs['revision_id'] = kwargs['revision_id'].encode('utf-8')
        kwargs['base_revision_id'] =\
            kwargs['base_revision_id'].encode('utf-8')
        return klass(time=time, timezone=timezone, patch=patch, bundle=bundle,
                     **kwargs)

    def to_lines(self):
        lines = self._to_lines(base_revision=True)
        if self.patch is not None:
            lines.append('# Begin patch\n')
            lines.extend(self.patch.splitlines(True))
        if self.bundle is not None:
            lines.append('# Begin bundle\n')
            lines.extend(self.bundle.splitlines(True))
        return lines

    @classmethod
    def from_objects(klass, repository, revision_id, time, timezone,
                 target_branch, include_patch=True, include_bundle=True,
                 local_target_branch=None, public_branch=None, message=None,
                 base_revision_id=None):
        """Generate a merge directive from various objects

        :param repository: The repository containing the revision
        :param revision_id: The revision to merge
        :param time: The POSIX timestamp of the date the request was issued.
        :param timezone: The timezone of the request
        :param target_branch: The url of the branch to merge into
        :param include_patch: If true, include a preview patch
        :param include_bundle: If true, include a bundle
        :param local_target_branch: a local copy of the target branch
        :param public_branch: location of a public branch containing the target
            revision.
        :param message: Message to use when committing the merge
        :return: The merge directive

        The public branch is always used if supplied.  If no bundle is
        included, the public branch must be supplied, and will be verified.

        If the message is not supplied, the message from revision_id will be
        used for the commit.
        """
        locked = []
        try:
            repository.lock_write()
            locked.append(repository)
            t_revision_id = revision_id
            if revision_id == 'null:':
                t_revision_id = None
            t = testament.StrictTestament3.from_revision(repository,
                t_revision_id)
            submit_branch = _mod_branch.Branch.open(target_branch)
            submit_branch.lock_read()
            locked.append(submit_branch)
            if submit_branch.get_public_branch() is not None:
                target_branch = submit_branch.get_public_branch()
            submit_revision_id = submit_branch.last_revision()
            submit_revision_id = _mod_revision.ensure_null(submit_revision_id)
            graph = repository.get_graph(submit_branch.repository)
            ancestor_id = graph.find_unique_lca(revision_id,
                                                submit_revision_id)
            if base_revision_id is None:
                base_revision_id = ancestor_id
            if (include_patch, include_bundle) != (False, False):
                repository.fetch(submit_branch.repository, submit_revision_id)
            if include_patch:
                patch = klass._generate_diff(repository, revision_id,
                                             base_revision_id)
            else:
                patch = None

            if include_bundle:
                bundle = klass._generate_bundle(repository, revision_id,
                    ancestor_id).encode('base-64')
            else:
                bundle = None

            if public_branch is not None and not include_bundle:
                public_branch_obj = _mod_branch.Branch.open(public_branch)
                public_branch_obj.lock_read()
                locked.append(public_branch_obj)
                if not public_branch_obj.repository.has_revision(
                    revision_id):
                    raise errors.PublicBranchOutOfDate(public_branch,
                                                       revision_id)
        finally:
            for entry in reversed(locked):
                entry.unlock()
        return klass(revision_id, t.as_sha1(), time, timezone, target_branch,
            patch, public_branch, message, bundle, base_revision_id)

    def _verify_patch(self, repository):
        calculated_patch = self._generate_diff(repository, self.revision_id,
                                               self.base_revision_id)
        # Convert line-endings to UNIX
        stored_patch = re.sub('\r\n?', '\n', self.patch)
        calculated_patch = re.sub('\r\n?', '\n', calculated_patch)
        # Strip trailing whitespace
        calculated_patch = re.sub(' *\n', '\n', calculated_patch)
        stored_patch = re.sub(' *\n', '\n', stored_patch)
        return (calculated_patch == stored_patch)

    def get_merge_request(self, repository):
        """Provide data for performing a merge

        Returns suggested base, suggested target, and patch verification status
        """
        verified = self._maybe_verify(repository)
        return self.base_revision_id, self.revision_id, verified

    def _maybe_verify(self, repository):
        if self.patch is not None:
            if self._verify_patch(repository):
                return 'verified'
            else:
                return 'failed'
        else:
            return 'inapplicable'


class MergeDirectiveFormatRegistry(registry.Registry):

    def register(self, directive, format_string=None):
        if format_string is None:
            format_string = directive._format_string
        registry.Registry.register(self, format_string, directive)


_format_registry = MergeDirectiveFormatRegistry()
_format_registry.register(MergeDirective)
_format_registry.register(MergeDirective2)
_format_registry.register(MergeDirective2,
                          'Bazaar merge directive format 2 (Bazaar 0.19)')