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Viewing changes to breezy/plugins/git/interrepo.py

  • Committer: Jelmer Vernooij
  • Date: 2018-06-18 02:13:57 UTC
  • mto: (6973.12.2 python3-k)
  • mto: This revision was merged to the branch mainline in revision 7004.
  • Revision ID: jelmer@jelmer.uk-20180618021357-xz802zqfmrf7zv1z
More test fixes.

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breezy/plugins/git/interrepo.py
 
1
# Copyright (C) 2009-2018 Jelmer Vernooij <jelmer@jelmer.uk>
 
2
#
 
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.
 
7
#
 
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.
 
12
#
 
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
 
16
 
 
17
"""InterRepository operations."""
 
18
 
 
19
from __future__ import absolute_import
 
20
 
 
21
from io import BytesIO
 
22
 
 
23
from dulwich.errors import (
 
24
    NotCommitError,
 
25
    )
 
26
from dulwich.object_store import (
 
27
    ObjectStoreGraphWalker,
 
28
    )
 
29
from dulwich.protocol import (
 
30
    CAPABILITY_THIN_PACK,
 
31
    ZERO_SHA,
 
32
    )
 
33
from dulwich.refs import SYMREF
 
34
from dulwich.walk import Walker
 
35
 
 
36
from ...errors import (
 
37
    DivergedBranches,
 
38
    FetchLimitUnsupported,
 
39
    InvalidRevisionId,
 
40
    LossyPushToSameVCS,
 
41
    NoRoundtrippingSupport,
 
42
    NoSuchRevision,
 
43
    )
 
44
from ...repository import (
 
45
    InterRepository,
 
46
    )
 
47
from ...revision import (
 
48
    NULL_REVISION,
 
49
    )
 
50
from ... import (
 
51
    config,
 
52
    trace,
 
53
    ui,
 
54
    )
 
55
 
 
56
from .errors import (
 
57
    NoPushSupport,
 
58
    )
 
59
from .fetch import (
 
60
    import_git_objects,
 
61
    DetermineWantsRecorder,
 
62
    )
 
63
from .mapping import (
 
64
    needs_roundtripping,
 
65
    )
 
66
from .object_store import (
 
67
    get_object_store,
 
68
    )
 
69
from .push import (
 
70
    MissingObjectsIterator,
 
71
    remote_divergence,
 
72
    )
 
73
from .refs import (
 
74
    is_tag,
 
75
    )
 
76
from .repository import (
 
77
    GitRepository,
 
78
    LocalGitRepository,
 
79
    GitRepositoryFormat,
 
80
    )
 
81
from .remote import (
 
82
    RemoteGitRepository,
 
83
    )
 
84
from .unpeel_map import (
 
85
    UnpeelMap,
 
86
    )
 
87
 
 
88
 
 
89
class InterToGitRepository(InterRepository):
 
90
    """InterRepository that copies into a Git repository."""
 
91
 
 
92
    _matching_repo_format = GitRepositoryFormat()
 
93
 
 
94
    def __init__(self, source, target):
 
95
        super(InterToGitRepository, self).__init__(source, target)
 
96
        self.mapping = self.target.get_mapping()
 
97
        self.source_store = get_object_store(self.source, self.mapping)
 
98
 
 
99
    @staticmethod
 
100
    def _get_repo_format_to_test():
 
101
        return None
 
102
 
 
103
    def copy_content(self, revision_id=None, pb=None):
 
104
        """See InterRepository.copy_content."""
 
105
        self.fetch(revision_id, pb, find_ghosts=False)
 
106
 
 
107
    def fetch_refs(self, update_refs, lossy, overwrite=False):
 
108
        """Fetch possibly roundtripped revisions into the target repository
 
109
        and update refs.
 
110
 
 
111
        :param update_refs: Generate refs to fetch. Receives dictionary
 
112
            with old refs (git shas), returns dictionary of new names to
 
113
            git shas.
 
114
        :param lossy: Whether to roundtrip
 
115
        :return: old refs, new refs
 
116
        """
 
117
        raise NotImplementedError(self.fetch_refs)
 
118
 
 
119
    def search_missing_revision_ids(self,
 
120
            find_ghosts=True, revision_ids=None, if_present_ids=None,
 
121
            limit=None):
 
122
        if limit is not None:
 
123
            raise FetchLimitUnsupported(self)
 
124
        git_shas = []
 
125
        todo = []
 
126
        if revision_ids:
 
127
            todo.extend(revision_ids)
 
128
        if if_present_ids:
 
129
            todo.extend(revision_ids)
 
130
        with self.source_store.lock_read():
 
131
            for revid in revision_ids:
 
132
                if revid == NULL_REVISION:
 
133
                    continue
 
134
                git_sha = self.source_store._lookup_revision_sha1(revid)
 
135
                git_shas.append(git_sha)
 
136
            walker = Walker(self.source_store,
 
137
                include=git_shas, exclude=[
 
138
                    sha for sha in self.target.controldir.get_refs_container().as_dict().values()
 
139
                    if sha != ZERO_SHA])
 
140
            missing_revids = set()
 
141
            for entry in walker:
 
142
                for (kind, type_data) in self.source_store.lookup_git_sha(entry.commit.id):
 
143
                    if kind == "commit":
 
144
                        missing_revids.add(type_data[0])
 
145
        return self.source.revision_ids_to_search_result(missing_revids)
 
146
 
 
147
    def _warn_slow(self):
 
148
        if not config.GlobalConfig().suppress_warning('slow_intervcs_push'):
 
149
            trace.warning(
 
150
                'Pushing from a Bazaar to a Git repository. '
 
151
                'For better performance, push into a Bazaar repository.')
 
152
 
 
153
 
 
154
class InterToLocalGitRepository(InterToGitRepository):
 
155
    """InterBranch implementation between a Bazaar and a Git repository."""
 
156
 
 
157
    def __init__(self, source, target):
 
158
        super(InterToLocalGitRepository, self).__init__(source, target)
 
159
        self.target_store = self.target.controldir._git.object_store
 
160
        self.target_refs = self.target.controldir._git.refs
 
161
 
 
162
    def _commit_needs_fetching(self, sha_id):
 
163
        try:
 
164
            return (sha_id not in self.target_store)
 
165
        except NoSuchRevision:
 
166
            # Ghost, can't push
 
167
            return False
 
168
 
 
169
    def _revision_needs_fetching(self, sha_id, revid):
 
170
        if revid == NULL_REVISION:
 
171
            return False
 
172
        if sha_id is None:
 
173
            try:
 
174
                sha_id = self.source_store._lookup_revision_sha1(revid)
 
175
            except KeyError:
 
176
                return False
 
177
        return self._commit_needs_fetching(sha_id)
 
178
 
 
179
    def missing_revisions(self, stop_revisions):
 
180
        """Find the revisions that are missing from the target repository.
 
181
 
 
182
        :param stop_revisions: Revisions to check for (tuples with
 
183
            Git SHA1, bzr revid)
 
184
        :return: sequence of missing revisions, in topological order
 
185
        :raise: NoSuchRevision if the stop_revisions are not present in
 
186
            the source
 
187
        """
 
188
        revid_sha_map = {}
 
189
        stop_revids = []
 
190
        for (sha1, revid) in stop_revisions:
 
191
            if sha1 is not None and revid is not None:
 
192
                revid_sha_map[revid] = sha1
 
193
                stop_revids.append(revid)
 
194
            elif sha1 is not None:
 
195
                if self._commit_needs_fetching(sha1):
 
196
                    for (kind, (revid, tree_sha, verifiers)) in self.source_store.lookup_git_sha(sha1):
 
197
                        revid_sha_map[revid] = sha1
 
198
                        stop_revids.append(revid)
 
199
            else:
 
200
                if revid is None:
 
201
                    raise AssertionError
 
202
                stop_revids.append(revid)
 
203
        missing = set()
 
204
        graph = self.source.get_graph()
 
205
        pb = ui.ui_factory.nested_progress_bar()
 
206
        try:
 
207
            while stop_revids:
 
208
                new_stop_revids = []
 
209
                for revid in stop_revids:
 
210
                    sha1 = revid_sha_map.get(revid)
 
211
                    if (not revid in missing and
 
212
                        self._revision_needs_fetching(sha1, revid)):
 
213
                        missing.add(revid)
 
214
                        new_stop_revids.append(revid)
 
215
                stop_revids = set()
 
216
                parent_map = graph.get_parent_map(new_stop_revids)
 
217
                for parent_revids in parent_map.itervalues():
 
218
                    stop_revids.update(parent_revids)
 
219
                pb.update("determining revisions to fetch", len(missing))
 
220
        finally:
 
221
            pb.finished()
 
222
        return graph.iter_topo_order(missing)
 
223
 
 
224
    def _get_target_bzr_refs(self):
 
225
        """Return a dictionary with references.
 
226
 
 
227
        :return: Dictionary with reference names as keys and tuples
 
228
            with Git SHA, Bazaar revid as values.
 
229
        """
 
230
        bzr_refs = {}
 
231
        refs = {}
 
232
        for k in self.target._git.refs.allkeys():
 
233
            try:
 
234
                v = self.target._git.refs.read_ref(k)
 
235
            except KeyError:
 
236
                # broken symref?
 
237
                continue
 
238
            revid = None
 
239
            if not v.startswith(SYMREF):
 
240
                try:
 
241
                    for (kind, type_data) in self.source_store.lookup_git_sha(v):
 
242
                        if kind == "commit" and self.source.has_revision(type_data[0]):
 
243
                            revid = type_data[0]
 
244
                            break
 
245
                except KeyError:
 
246
                    pass
 
247
            bzr_refs[k] = (v, revid)
 
248
        return bzr_refs
 
249
 
 
250
    def fetch_refs(self, update_refs, lossy, overwrite=False):
 
251
        self._warn_slow()
 
252
        with self.source_store.lock_read():
 
253
            old_refs = self._get_target_bzr_refs()
 
254
            new_refs = update_refs(old_refs)
 
255
            revidmap = self.fetch_objects(
 
256
                [(git_sha, bzr_revid) for (git_sha, bzr_revid) in new_refs.values() if git_sha is None or not git_sha.startswith(SYMREF)], lossy=lossy)
 
257
            for name, (gitid, revid) in new_refs.iteritems():
 
258
                if gitid is None:
 
259
                    try:
 
260
                        gitid = revidmap[revid][0]
 
261
                    except KeyError:
 
262
                        gitid = self.source_store._lookup_revision_sha1(revid)
 
263
                if gitid.startswith(SYMREF):
 
264
                    self.target_refs.set_symbolic_ref(name, gitid[len(SYMREF):])
 
265
                else:
 
266
                    try:
 
267
                        old_git_id = old_refs[name][0]
 
268
                    except KeyError:
 
269
                        self.target_refs.add_if_new(name, gitid)
 
270
                    else:
 
271
                        self.target_refs.set_if_equals(name, old_git_id, gitid)
 
272
        return revidmap, old_refs, new_refs
 
273
 
 
274
    def fetch_objects(self, revs, lossy, limit=None):
 
275
        if not lossy and not self.mapping.roundtripping:
 
276
            for git_sha, bzr_revid in revs:
 
277
                if bzr_revid is not None and needs_roundtripping(self.source, bzr_revid):
 
278
                    raise NoPushSupport(self.source, self.target, self.mapping,
 
279
                                        bzr_revid)
 
280
        with self.source_store.lock_read():
 
281
            todo = list(self.missing_revisions(revs))[:limit]
 
282
            revidmap = {}
 
283
            pb = ui.ui_factory.nested_progress_bar()
 
284
            try:
 
285
                object_generator = MissingObjectsIterator(
 
286
                    self.source_store, self.source, pb)
 
287
                for (old_revid, git_sha) in object_generator.import_revisions(
 
288
                    todo, lossy=lossy):
 
289
                    if lossy:
 
290
                        new_revid = self.mapping.revision_id_foreign_to_bzr(git_sha)
 
291
                    else:
 
292
                        new_revid = old_revid
 
293
                        try:
 
294
                            self.mapping.revision_id_bzr_to_foreign(old_revid)
 
295
                        except InvalidRevisionId:
 
296
                            refname = self.mapping.revid_as_refname(old_revid)
 
297
                            self.target_refs[refname] = git_sha
 
298
                    revidmap[old_revid] = (git_sha, new_revid)
 
299
                self.target_store.add_objects(object_generator)
 
300
                return revidmap
 
301
            finally:
 
302
                pb.finished()
 
303
 
 
304
    def fetch(self, revision_id=None, pb=None, find_ghosts=False,
 
305
            fetch_spec=None, mapped_refs=None):
 
306
        if mapped_refs is not None:
 
307
            stop_revisions = mapped_refs
 
308
        elif revision_id is not None:
 
309
            stop_revisions = [(None, revision_id)]
 
310
        elif fetch_spec is not None:
 
311
            recipe = fetch_spec.get_recipe()
 
312
            if recipe[0] in ("search", "proxy-search"):
 
313
                stop_revisions = [(None, revid) for revid in recipe[1]]
 
314
            else:
 
315
                raise AssertionError("Unsupported search result type %s" % recipe[0])
 
316
        else:
 
317
            stop_revisions = [(None, revid) for revid in self.source.all_revision_ids()]
 
318
        self._warn_slow()
 
319
        try:
 
320
            self.fetch_objects(stop_revisions, lossy=False)
 
321
        except NoPushSupport:
 
322
            raise NoRoundtrippingSupport(self.source, self.target)
 
323
 
 
324
    @staticmethod
 
325
    def is_compatible(source, target):
 
326
        """Be compatible with GitRepository."""
 
327
        return (not isinstance(source, GitRepository) and
 
328
                isinstance(target, LocalGitRepository))
 
329
 
 
330
 
 
331
class InterToRemoteGitRepository(InterToGitRepository):
 
332
 
 
333
    def fetch_refs(self, update_refs, lossy, overwrite=False):
 
334
        """Import the gist of the ancestry of a particular revision."""
 
335
        if not lossy and not self.mapping.roundtripping:
 
336
            raise NoPushSupport(self.source, self.target, self.mapping)
 
337
        unpeel_map = UnpeelMap.from_repository(self.source)
 
338
        revidmap = {}
 
339
        def determine_wants(old_refs):
 
340
            ret = {}
 
341
            self.old_refs = dict([(k, (v, None)) for (k, v) in old_refs.iteritems()])
 
342
            self.new_refs = update_refs(self.old_refs)
 
343
            for name, (gitid, revid) in self.new_refs.iteritems():
 
344
                if gitid is None:
 
345
                    git_sha = self.source_store._lookup_revision_sha1(revid)
 
346
                    gitid = unpeel_map.re_unpeel_tag(git_sha, old_refs.get(name))
 
347
                if not overwrite:
 
348
                    if remote_divergence(old_refs.get(name), gitid, self.source_store):
 
349
                        raise DivergedBranches(self.source, self.target)
 
350
                ret[name] = gitid
 
351
            return ret
 
352
        self._warn_slow()
 
353
        with self.source_store.lock_read():
 
354
            new_refs = self.target.send_pack(determine_wants,
 
355
                    self.source_store.generate_lossy_pack_data)
 
356
        # FIXME: revidmap?
 
357
        return revidmap, self.old_refs, self.new_refs
 
358
 
 
359
    @staticmethod
 
360
    def is_compatible(source, target):
 
361
        """Be compatible with GitRepository."""
 
362
        return (not isinstance(source, GitRepository) and
 
363
                isinstance(target, RemoteGitRepository))
 
364
 
 
365
 
 
366
class InterFromGitRepository(InterRepository):
 
367
 
 
368
    _matching_repo_format = GitRepositoryFormat()
 
369
 
 
370
    def _target_has_shas(self, shas):
 
371
        raise NotImplementedError(self._target_has_shas)
 
372
 
 
373
    def get_determine_wants_heads(self, wants, include_tags=False):
 
374
        wants = set(wants)
 
375
        def determine_wants(refs):
 
376
            potential = set(wants)
 
377
            if include_tags:
 
378
                for k, unpeeled in refs.iteritems():
 
379
                    if k.endswith("^{}"):
 
380
                        continue
 
381
                    if not is_tag(k):
 
382
                        continue
 
383
                    if unpeeled == ZERO_SHA:
 
384
                        continue
 
385
                    potential.add(unpeeled)
 
386
            return list(potential - self._target_has_shas(potential))
 
387
        return determine_wants
 
388
 
 
389
    def determine_wants_all(self, refs):
 
390
        raise NotImplementedError(self.determine_wants_all)
 
391
 
 
392
    @staticmethod
 
393
    def _get_repo_format_to_test():
 
394
        return None
 
395
 
 
396
    def copy_content(self, revision_id=None):
 
397
        """See InterRepository.copy_content."""
 
398
        self.fetch(revision_id, find_ghosts=False)
 
399
 
 
400
    def search_missing_revision_ids(self,
 
401
            find_ghosts=True, revision_ids=None, if_present_ids=None,
 
402
            limit=None):
 
403
        if limit is not None:
 
404
            raise FetchLimitUnsupported(self)
 
405
        git_shas = []
 
406
        todo = []
 
407
        if revision_ids:
 
408
            todo.extend(revision_ids)
 
409
        if if_present_ids:
 
410
            todo.extend(revision_ids)
 
411
        with self.lock_read():
 
412
            for revid in revision_ids:
 
413
                if revid == NULL_REVISION:
 
414
                    continue
 
415
                git_sha, mapping = self.source.lookup_bzr_revision_id(revid)
 
416
                git_shas.append(git_sha)
 
417
            walker = Walker(self.source._git.object_store,
 
418
                include=git_shas, exclude=[
 
419
                    sha for sha in self.target.controldir.get_refs_container().as_dict().values()
 
420
                    if sha != ZERO_SHA])
 
421
            missing_revids = set()
 
422
            for entry in walker:
 
423
                missing_revids.add(self.source.lookup_foreign_revision_id(entry.commit.id))
 
424
            return self.source.revision_ids_to_search_result(missing_revids)
 
425
 
 
426
 
 
427
class InterGitNonGitRepository(InterFromGitRepository):
 
428
    """Base InterRepository that copies revisions from a Git into a non-Git
 
429
    repository."""
 
430
 
 
431
    def _target_has_shas(self, shas):
 
432
        revids = {}
 
433
        for sha in shas:
 
434
            try:
 
435
                revid = self.source.lookup_foreign_revision_id(sha)
 
436
            except NotCommitError:
 
437
                # Commit is definitely not present
 
438
                continue
 
439
            else:
 
440
                revids[revid] = sha
 
441
        return set([revids[r] for r in self.target.has_revisions(revids)])
 
442
 
 
443
    def determine_wants_all(self, refs):
 
444
        potential = set()
 
445
        for k, v in refs.iteritems():
 
446
            # For non-git target repositories, only worry about peeled
 
447
            if v == ZERO_SHA:
 
448
                continue
 
449
            potential.add(self.source.controldir.get_peeled(k) or v)
 
450
        return list(potential - self._target_has_shas(potential))
 
451
 
 
452
    def get_determine_wants_heads(self, wants, include_tags=False):
 
453
        wants = set(wants)
 
454
        def determine_wants(refs):
 
455
            potential = set(wants)
 
456
            if include_tags:
 
457
                for k, unpeeled in refs.iteritems():
 
458
                    if not is_tag(k):
 
459
                        continue
 
460
                    if unpeeled == ZERO_SHA:
 
461
                        continue
 
462
                    potential.add(self.source.controldir.get_peeled(k) or unpeeled)
 
463
            return list(potential - self._target_has_shas(potential))
 
464
        return determine_wants
 
465
 
 
466
    def _warn_slow(self):
 
467
        if not config.GlobalConfig().suppress_warning('slow_intervcs_push'):
 
468
            trace.warning(
 
469
                'Fetching from Git to Bazaar repository. '
 
470
                'For better performance, fetch into a Git repository.')
 
471
 
 
472
    def fetch_objects(self, determine_wants, mapping, limit=None, lossy=False):
 
473
        """Fetch objects from a remote server.
 
474
 
 
475
        :param determine_wants: determine_wants callback
 
476
        :param mapping: BzrGitMapping to use
 
477
        :param limit: Maximum number of commits to import.
 
478
        :return: Tuple with pack hint, last imported revision id and remote refs
 
479
        """
 
480
        raise NotImplementedError(self.fetch_objects)
 
481
 
 
482
    def get_determine_wants_revids(self, revids, include_tags=False):
 
483
        wants = set()
 
484
        for revid in set(revids):
 
485
            if self.target.has_revision(revid):
 
486
                continue
 
487
            git_sha, mapping = self.source.lookup_bzr_revision_id(revid)
 
488
            wants.add(git_sha)
 
489
        return self.get_determine_wants_heads(wants, include_tags=include_tags)
 
490
 
 
491
    def fetch(self, revision_id=None, find_ghosts=False,
 
492
              mapping=None, fetch_spec=None, include_tags=False):
 
493
        if mapping is None:
 
494
            mapping = self.source.get_mapping()
 
495
        if revision_id is not None:
 
496
            interesting_heads = [revision_id]
 
497
        elif fetch_spec is not None:
 
498
            recipe = fetch_spec.get_recipe()
 
499
            if recipe[0] in ("search", "proxy-search"):
 
500
                interesting_heads = recipe[1]
 
501
            else:
 
502
                raise AssertionError("Unsupported search result type %s" %
 
503
                        recipe[0])
 
504
        else:
 
505
            interesting_heads = None
 
506
 
 
507
        if interesting_heads is not None:
 
508
            determine_wants = self.get_determine_wants_revids(
 
509
                interesting_heads, include_tags=include_tags)
 
510
        else:
 
511
            determine_wants = self.determine_wants_all
 
512
 
 
513
        (pack_hint, _, remote_refs) = self.fetch_objects(determine_wants,
 
514
            mapping)
 
515
        if pack_hint is not None and self.target._format.pack_compresses:
 
516
            self.target.pack(hint=pack_hint)
 
517
        return remote_refs
 
518
 
 
519
 
 
520
class InterRemoteGitNonGitRepository(InterGitNonGitRepository):
 
521
    """InterRepository that copies revisions from a remote Git into a non-Git
 
522
    repository."""
 
523
 
 
524
    def get_target_heads(self):
 
525
        # FIXME: This should be more efficient
 
526
        all_revs = self.target.all_revision_ids()
 
527
        parent_map = self.target.get_parent_map(all_revs)
 
528
        all_parents = set()
 
529
        map(all_parents.update, parent_map.itervalues())
 
530
        return set(all_revs) - all_parents
 
531
 
 
532
    def fetch_objects(self, determine_wants, mapping, limit=None, lossy=False):
 
533
        """See `InterGitNonGitRepository`."""
 
534
        self._warn_slow()
 
535
        store = get_object_store(self.target, mapping)
 
536
        with store.lock_write():
 
537
            heads = self.get_target_heads()
 
538
            graph_walker = ObjectStoreGraphWalker(
 
539
                [store._lookup_revision_sha1(head) for head in heads],
 
540
                lambda sha: store[sha].parents)
 
541
            wants_recorder = DetermineWantsRecorder(determine_wants)
 
542
 
 
543
            pb = ui.ui_factory.nested_progress_bar()
 
544
            try:
 
545
                objects_iter = self.source.fetch_objects(
 
546
                    wants_recorder, graph_walker, store.get_raw)
 
547
                trace.mutter("Importing %d new revisions",
 
548
                             len(wants_recorder.wants))
 
549
                (pack_hint, last_rev) = import_git_objects(self.target,
 
550
                    mapping, objects_iter, store, wants_recorder.wants, pb,
 
551
                    limit)
 
552
                return (pack_hint, last_rev, wants_recorder.remote_refs)
 
553
            finally:
 
554
                pb.finished()
 
555
 
 
556
    @staticmethod
 
557
    def is_compatible(source, target):
 
558
        """Be compatible with GitRepository."""
 
559
        if not isinstance(source, RemoteGitRepository):
 
560
            return False
 
561
        if not target.supports_rich_root():
 
562
            return False
 
563
        if isinstance(target, GitRepository):
 
564
            return False
 
565
        if not getattr(target._format, "supports_full_versioned_files", True):
 
566
            return False
 
567
        return True
 
568
 
 
569
 
 
570
class InterLocalGitNonGitRepository(InterGitNonGitRepository):
 
571
    """InterRepository that copies revisions from a local Git into a non-Git
 
572
    repository."""
 
573
 
 
574
    def fetch_objects(self, determine_wants, mapping, limit=None, lossy=False):
 
575
        """See `InterGitNonGitRepository`."""
 
576
        self._warn_slow()
 
577
        remote_refs = self.source.controldir.get_refs_container().as_dict()
 
578
        wants = determine_wants(remote_refs)
 
579
        create_pb = None
 
580
        pb = ui.ui_factory.nested_progress_bar()
 
581
        target_git_object_retriever = get_object_store(self.target, mapping)
 
582
        try:
 
583
            target_git_object_retriever.lock_write()
 
584
            try:
 
585
                (pack_hint, last_rev) = import_git_objects(self.target,
 
586
                    mapping, self.source._git.object_store,
 
587
                    target_git_object_retriever, wants, pb, limit)
 
588
                return (pack_hint, last_rev, remote_refs)
 
589
            finally:
 
590
                target_git_object_retriever.unlock()
 
591
        finally:
 
592
            pb.finished()
 
593
 
 
594
    @staticmethod
 
595
    def is_compatible(source, target):
 
596
        """Be compatible with GitRepository."""
 
597
        if not isinstance(source, LocalGitRepository):
 
598
            return False
 
599
        if not target.supports_rich_root():
 
600
            return False
 
601
        if isinstance(target, GitRepository):
 
602
            return False
 
603
        if not getattr(target._format, "supports_full_versioned_files", True):
 
604
            return False
 
605
        return True
 
606
 
 
607
 
 
608
class InterGitGitRepository(InterFromGitRepository):
 
609
    """InterRepository that copies between Git repositories."""
 
610
 
 
611
    def fetch_refs(self, update_refs, lossy, overwrite=False):
 
612
        if lossy:
 
613
            raise LossyPushToSameVCS(self.source, self.target)
 
614
        old_refs = self.target.controldir.get_refs_container()
 
615
        ref_changes = {}
 
616
        def determine_wants(heads):
 
617
            old_refs = dict([(k, (v, None)) for (k, v) in heads.as_dict().iteritems()])
 
618
            new_refs = update_refs(old_refs)
 
619
            ref_changes.update(new_refs)
 
620
            return [sha1 for (sha1, bzr_revid) in new_refs.itervalues()]
 
621
        self.fetch_objects(determine_wants, lossy=lossy)
 
622
        for k, (git_sha, bzr_revid) in ref_changes.iteritems():
 
623
            self.target._git.refs[k] = git_sha
 
624
        new_refs = self.target.controldir.get_refs_container()
 
625
        return None, old_refs, new_refs
 
626
 
 
627
    def fetch_objects(self, determine_wants, mapping=None, limit=None, lossy=False):
 
628
        raise NotImplementedError(self.fetch_objects)
 
629
 
 
630
    def _target_has_shas(self, shas):
 
631
        return set([sha for sha in shas if sha in self.target._git.object_store])
 
632
 
 
633
    def fetch(self, revision_id=None, find_ghosts=False,
 
634
              mapping=None, fetch_spec=None, branches=None, limit=None, include_tags=False):
 
635
        if mapping is None:
 
636
            mapping = self.source.get_mapping()
 
637
        if revision_id is not None:
 
638
            args = [revision_id]
 
639
        elif fetch_spec is not None:
 
640
            recipe = fetch_spec.get_recipe()
 
641
            if recipe[0] in ("search", "proxy-search"):
 
642
                heads = recipe[1]
 
643
            else:
 
644
                raise AssertionError(
 
645
                    "Unsupported search result type %s" % recipe[0])
 
646
            args = heads
 
647
        if branches is not None:
 
648
            def determine_wants(refs):
 
649
                ret = []
 
650
                for name, value in refs.iteritems():
 
651
                    if value == ZERO_SHA:
 
652
                        continue
 
653
 
 
654
                    if name in branches or (include_tags and is_tag(name)):
 
655
                        ret.append(value)
 
656
                return ret
 
657
        elif fetch_spec is None and revision_id is None:
 
658
            determine_wants = self.determine_wants_all
 
659
        else:
 
660
            determine_wants = self.get_determine_wants_revids(args, include_tags=include_tags)
 
661
        wants_recorder = DetermineWantsRecorder(determine_wants)
 
662
        self.fetch_objects(wants_recorder, mapping, limit=limit)
 
663
        return wants_recorder.remote_refs
 
664
 
 
665
    def get_determine_wants_revids(self, revids, include_tags=False):
 
666
        wants = set()
 
667
        for revid in set(revids):
 
668
            if revid == NULL_REVISION:
 
669
                continue
 
670
            git_sha, mapping = self.source.lookup_bzr_revision_id(revid)
 
671
            wants.add(git_sha)
 
672
        return self.get_determine_wants_heads(wants, include_tags=include_tags)
 
673
 
 
674
    def determine_wants_all(self, refs):
 
675
        potential = set([v for v in refs.values() if not v == ZERO_SHA])
 
676
        return list(potential - self._target_has_shas(potential))
 
677
 
 
678
 
 
679
class InterLocalGitLocalGitRepository(InterGitGitRepository):
 
680
 
 
681
    def fetch_objects(self, determine_wants, mapping=None, limit=None, lossy=False):
 
682
        if lossy:
 
683
            raise LossyPushToSameVCS(self.source, self.target)
 
684
        if limit is not None:
 
685
            raise FetchLimitUnsupported(self)
 
686
        refs = self.source._git.fetch(self.target._git, determine_wants)
 
687
        return (None, None, refs)
 
688
 
 
689
    @staticmethod
 
690
    def is_compatible(source, target):
 
691
        """Be compatible with GitRepository."""
 
692
        return (isinstance(source, LocalGitRepository) and
 
693
                isinstance(target, LocalGitRepository))
 
694
 
 
695
 
 
696
class InterRemoteGitLocalGitRepository(InterGitGitRepository):
 
697
 
 
698
    def fetch_objects(self, determine_wants, mapping=None, limit=None, lossy=False):
 
699
        if lossy:
 
700
            raise LossyPushToSameVCS(self.source, self.target)
 
701
        if limit is not None:
 
702
            raise FetchLimitUnsupported(self)
 
703
        graphwalker = self.target._git.get_graph_walker()
 
704
        if CAPABILITY_THIN_PACK in self.source.controldir._client._fetch_capabilities:
 
705
            # TODO(jelmer): Avoid reading entire file into memory and
 
706
            # only processing it after the whole file has been fetched.
 
707
            f = BytesIO()
 
708
 
 
709
            def commit():
 
710
                if f.tell():
 
711
                    f.seek(0)
 
712
                    self.target._git.object_store.move_in_thin_pack(f)
 
713
 
 
714
            def abort():
 
715
                pass
 
716
        else:
 
717
            f, commit, abort = self.target._git.object_store.add_pack()
 
718
        try:
 
719
            refs = self.source.controldir.fetch_pack(
 
720
                determine_wants, graphwalker, f.write)
 
721
            commit()
 
722
            return (None, None, refs)
 
723
        except BaseException:
 
724
            abort()
 
725
            raise
 
726
 
 
727
    @staticmethod
 
728
    def is_compatible(source, target):
 
729
        """Be compatible with GitRepository."""
 
730
        return (isinstance(source, RemoteGitRepository) and
 
731
                isinstance(target, LocalGitRepository))