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branch.py
 
1
# Copyright (C) 2007 Canonical Ltd
 
2
# Copyright (C) 2009 Jelmer Vernooij <jelmer@samba.org>
 
3
#
 
4
# This program is free software; you can redistribute it and/or modify
 
5
# it under the terms of the GNU General Public License as published by
 
6
# the Free Software Foundation; either version 2 of the License, or
 
7
# (at your option) any later version.
 
8
#
 
9
# This program is distributed in the hope that it will be useful,
 
10
# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
11
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
12
# GNU General Public License for more details.
 
13
#
 
14
# You should have received a copy of the GNU General Public License
 
15
# along with this program; if not, write to the Free Software
 
16
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
17
 
 
18
"""An adapter between a Git Branch and a Bazaar Branch"""
 
19
 
 
20
from dulwich.objects import (
 
21
    Commit,
 
22
    Tag,
 
23
    )
 
24
 
 
25
from bzrlib import (
 
26
    branch,
 
27
    config,
 
28
    errors,
 
29
    foreign,
 
30
    repository,
 
31
    revision,
 
32
    tag,
 
33
    transport,
 
34
    )
 
35
from bzrlib.decorators import (
 
36
    needs_read_lock,
 
37
    )
 
38
from bzrlib.trace import (
 
39
    is_quiet,
 
40
    mutter,
 
41
    )
 
42
 
 
43
from bzrlib.plugins.git.config import (
 
44
    GitBranchConfig,
 
45
    )
 
46
from bzrlib.plugins.git.errors import (
 
47
    NoPushSupport,
 
48
    NoSuchRef,
 
49
    )
 
50
 
 
51
try:
 
52
    from bzrlib.foreign import ForeignBranch
 
53
except ImportError:
 
54
    class ForeignBranch(branch.Branch):
 
55
        def __init__(self, mapping):
 
56
            self.mapping = mapping
 
57
            super(ForeignBranch, self).__init__()
 
58
 
 
59
 
 
60
def extract_tags(refs, mapping):
 
61
    ret = {}
 
62
    for k,v in refs.iteritems():
 
63
        if k.startswith("refs/tags/") and not k.endswith("^{}"):
 
64
            v = refs.get(k+"^{}", v)
 
65
            ret[k[len("refs/tags/"):]] = mapping.revision_id_foreign_to_bzr(v)
 
66
    return ret
 
67
 
 
68
 
 
69
class GitPullResult(branch.PullResult):
 
70
 
 
71
    def _lookup_revno(self, revid):
 
72
        assert isinstance(revid, str), "was %r" % revid
 
73
        # Try in source branch first, it'll be faster
 
74
        return self.target_branch.revision_id_to_revno(revid)
 
75
 
 
76
    @property
 
77
    def old_revno(self):
 
78
        return self._lookup_revno(self.old_revid)
 
79
 
 
80
    @property
 
81
    def new_revno(self):
 
82
        return self._lookup_revno(self.new_revid)
 
83
 
 
84
 
 
85
class LocalGitTagDict(tag.BasicTags):
 
86
    """Dictionary with tags in a local repository."""
 
87
 
 
88
    def __init__(self, branch):
 
89
        self.branch = branch
 
90
        self.repository = branch.repository
 
91
 
 
92
    def get_tag_dict(self):
 
93
        ret = {}
 
94
        for k,v in self.repository._git.refs.as_dict("refs/tags").iteritems():
 
95
            obj = self.repository._git.get_object(v)
 
96
            while isinstance(obj, Tag):
 
97
                v = obj.object[1]
 
98
                obj = self.repository._git.get_object(v)
 
99
            if not isinstance(obj, Commit):
 
100
                mutter("Tag %s points at object %r that is not a commit, "
 
101
                       "ignoring", k, obj)
 
102
                continue
 
103
            ret[k] = self.branch.mapping.revision_id_foreign_to_bzr(v)
 
104
        return ret
 
105
 
 
106
    def set_tag(self, name, revid):
 
107
        self.repository._git.refs["refs/tags/%s" % name], _ = \
 
108
            self.branch.mapping.revision_id_bzr_to_foreign(revid)
 
109
 
 
110
 
 
111
class GitBranchFormat(branch.BranchFormat):
 
112
 
 
113
    def get_format_description(self):
 
114
        return 'Git Branch'
 
115
 
 
116
    def supports_tags(self):
 
117
        return True
 
118
 
 
119
    def make_tags(self, branch):
 
120
        if getattr(branch.repository, "get_refs", None) is not None:
 
121
            from bzrlib.plugins.git.remote import RemoteGitTagDict
 
122
            return RemoteGitTagDict(branch)
 
123
        else:
 
124
            return LocalGitTagDict(branch)
 
125
 
 
126
 
 
127
class GitBranch(ForeignBranch):
 
128
    """An adapter to git repositories for bzr Branch objects."""
 
129
 
 
130
    def __init__(self, bzrdir, repository, name, lockfiles):
 
131
        self.repository = repository
 
132
        self._format = GitBranchFormat()
 
133
        self.control_files = lockfiles
 
134
        self.bzrdir = bzrdir
 
135
        super(GitBranch, self).__init__(repository.get_mapping())
 
136
        self.name = name
 
137
        self._head = None
 
138
        self.base = bzrdir.transport.base
 
139
 
 
140
    def _get_nick(self, local=False, possible_master_transports=None):
 
141
        """Find the nick name for this branch.
 
142
 
 
143
        :return: Branch nick
 
144
        """
 
145
        return self.name
 
146
 
 
147
    def _set_nick(self, nick):
 
148
        raise NotImplementedError
 
149
 
 
150
    nick = property(_get_nick, _set_nick)
 
151
 
 
152
    def __repr__(self):
 
153
        return "%s(%r, %r)" % (self.__class__.__name__, self.repository.base, self.name)
 
154
 
 
155
    def generate_revision_history(self, revid, old_revid=None):
 
156
        # FIXME: Check that old_revid is in the ancestry of revid
 
157
        newhead, self.mapping = self.mapping.revision_id_bzr_to_foreign(revid)
 
158
        self._set_head(newhead)
 
159
 
 
160
    def lock_write(self):
 
161
        self.control_files.lock_write()
 
162
 
 
163
    def get_stacked_on_url(self):
 
164
        # Git doesn't do stacking (yet...)
 
165
        return None
 
166
 
 
167
    def get_parent(self):
 
168
        """See Branch.get_parent()."""
 
169
        # FIXME: Set "origin" url from .git/config ?
 
170
        return None
 
171
 
 
172
    def set_parent(self, url):
 
173
        # FIXME: Set "origin" url in .git/config ?
 
174
        pass
 
175
 
 
176
    def lock_read(self):
 
177
        self.control_files.lock_read()
 
178
 
 
179
    def is_locked(self):
 
180
        return self.control_files.is_locked()
 
181
 
 
182
    def unlock(self):
 
183
        self.control_files.unlock()
 
184
 
 
185
    def get_physical_lock_status(self):
 
186
        return False
 
187
 
 
188
    @needs_read_lock
 
189
    def last_revision(self):
 
190
        # perhaps should escape this ?
 
191
        if self.head is None:
 
192
            return revision.NULL_REVISION
 
193
        return self.mapping.revision_id_foreign_to_bzr(self.head)
 
194
 
 
195
    def _basic_push(self, target, overwrite=False, stop_revision=None):
 
196
        return branch.InterBranch.get(self, target)._basic_push(
 
197
            overwrite, stop_revision)
 
198
 
 
199
 
 
200
class LocalGitBranch(GitBranch):
 
201
    """A local Git branch."""
 
202
 
 
203
    def _get_checkout_format(self):
 
204
        """Return the most suitable metadir for a checkout of this branch.
 
205
        Weaves are used if this branch's repository uses weaves.
 
206
        """
 
207
        format = self.repository.bzrdir.checkout_metadir()
 
208
        format.set_branch_format(self._format)
 
209
        return format
 
210
 
 
211
    def create_checkout(self, to_location, revision_id=None, lightweight=False,
 
212
        accelerator_tree=None, hardlink=False):
 
213
        if lightweight:
 
214
            t = transport.get_transport(to_location)
 
215
            t.ensure_base()
 
216
            format = self._get_checkout_format()
 
217
            checkout = format.initialize_on_transport(t)
 
218
            from_branch = branch.BranchReferenceFormat().initialize(checkout, 
 
219
                self)
 
220
            tree = checkout.create_workingtree(revision_id,
 
221
                from_branch=from_branch, hardlink=hardlink)
 
222
            return tree
 
223
        else:
 
224
            return self._create_heavyweight_checkout(to_location, revision_id,
 
225
            hardlink)
 
226
 
 
227
    def _create_heavyweight_checkout(self, to_location, revision_id=None, 
 
228
                                     hardlink=False):
 
229
        """Create a new heavyweight checkout of this branch.
 
230
 
 
231
        :param to_location: URL of location to create the new checkout in.
 
232
        :param revision_id: Revision that should be the tip of the checkout.
 
233
        :param hardlink: Whether to hardlink
 
234
        :return: WorkingTree object of checkout.
 
235
        """
 
236
        checkout_branch = BzrDir.create_branch_convenience(
 
237
            to_location, force_new_tree=False, format=get_rich_root_format())
 
238
        checkout = checkout_branch.bzrdir
 
239
        checkout_branch.bind(self)
 
240
        # pull up to the specified revision_id to set the initial 
 
241
        # branch tip correctly, and seed it with history.
 
242
        checkout_branch.pull(self, stop_revision=revision_id)
 
243
        return checkout.create_workingtree(revision_id, hardlink=hardlink)
 
244
 
 
245
    def _gen_revision_history(self):
 
246
        if self.head is None:
 
247
            return []
 
248
        ret = list(self.repository.iter_reverse_revision_history(
 
249
            self.last_revision()))
 
250
        ret.reverse()
 
251
        return ret
 
252
 
 
253
    def _get_head(self):
 
254
        try:
 
255
            return self.repository._git.ref(self.name)
 
256
        except KeyError:
 
257
            return None
 
258
 
 
259
    def _set_head(self, value):
 
260
        self._head = value
 
261
        self.repository._git.refs[self.name] = self._head
 
262
        self._clear_cached_state()
 
263
 
 
264
    head = property(_get_head, _set_head)
 
265
 
 
266
    def get_config(self):
 
267
        return GitBranchConfig(self)
 
268
 
 
269
    def get_push_location(self):
 
270
        """See Branch.get_push_location."""
 
271
        push_loc = self.get_config().get_user_option('push_location')
 
272
        return push_loc
 
273
 
 
274
    def set_push_location(self, location):
 
275
        """See Branch.set_push_location."""
 
276
        self.get_config().set_user_option('push_location', location,
 
277
                                          store=config.STORE_LOCATION)
 
278
 
 
279
    def supports_tags(self):
 
280
        return True
 
281
 
 
282
 
 
283
class GitBranchPullResult(branch.PullResult):
 
284
 
 
285
    def report(self, to_file):
 
286
        if not is_quiet():
 
287
            if self.old_revid == self.new_revid:
 
288
                to_file.write('No revisions to pull.\n')
 
289
            else:
 
290
                to_file.write('Now on revision %d (git sha: %s).\n' % 
 
291
                        (self.new_revno, self.new_git_head))
 
292
        self._show_tag_conficts(to_file)
 
293
 
 
294
 
 
295
class GitBranchPushResult(branch.BranchPushResult):
 
296
 
 
297
    def _lookup_revno(self, revid):
 
298
        assert isinstance(revid, str), "was %r" % revid
 
299
        # Try in source branch first, it'll be faster
 
300
        try:
 
301
            return self.source_branch.revision_id_to_revno(revid)
 
302
        except NoSuchRevision:
 
303
            # FIXME: Check using graph.find_distance_to_null() ?
 
304
            return self.target_branch.revision_id_to_revno(revid)
 
305
 
 
306
    @property
 
307
    def old_revno(self):
 
308
        return self._lookup_revno(self.old_revid)
 
309
 
 
310
    @property
 
311
    def new_revno(self):
 
312
        return self._lookup_revno(self.new_revid)
 
313
 
 
314
 
 
315
class InterFromGitBranch(branch.GenericInterBranch):
 
316
    """InterBranch implementation that pulls from Git into bzr."""
 
317
 
 
318
    @classmethod
 
319
    def is_compatible(self, source, target):
 
320
        return (isinstance(source, GitBranch) and 
 
321
                not isinstance(target, GitBranch))
 
322
 
 
323
    def update_revisions(self, stop_revision=None, overwrite=False,
 
324
        graph=None):
 
325
        """See InterBranch.update_revisions()."""
 
326
        interrepo = repository.InterRepository.get(self.source.repository, 
 
327
            self.target.repository)
 
328
        self._head = None
 
329
        self._last_revid = None
 
330
        def determine_wants(heads):
 
331
            if not self.source.name in heads:
 
332
                raise NoSuchRef(self.source.name, heads.keys())
 
333
            if stop_revision is not None:
 
334
                self._last_revid = stop_revision
 
335
                self._head, mapping = self.source.repository.lookup_git_revid(
 
336
                    stop_revision)
 
337
            else:
 
338
                self._head = heads[self.source.name]
 
339
                self._last_revid = \
 
340
                    self.source.mapping.revision_id_foreign_to_bzr(self._head)
 
341
            if self.target.repository.has_revision(self._last_revid):
 
342
                return []
 
343
            return [self._head]
 
344
        interrepo.fetch_objects(determine_wants, self.source.mapping)
 
345
        if overwrite:
 
346
            prev_last_revid = None
 
347
        else:
 
348
            prev_last_revid = self.target.last_revision()
 
349
        self.target.generate_revision_history(self._last_revid, prev_last_revid)
 
350
 
 
351
    def pull(self, overwrite=False, stop_revision=None,
 
352
             possible_transports=None, _hook_master=None, run_hooks=True,
 
353
             _override_hook_target=None, local=False):
 
354
        """See Branch.pull.
 
355
 
 
356
        :param _hook_master: Private parameter - set the branch to
 
357
            be supplied as the master to pull hooks.
 
358
        :param run_hooks: Private parameter - if false, this branch
 
359
            is being called because it's the master of the primary branch,
 
360
            so it should not run its hooks.
 
361
        :param _override_hook_target: Private parameter - set the branch to be
 
362
            supplied as the target_branch to pull hooks.
 
363
        """
 
364
        # This type of branch can't be bound.
 
365
        if local:
 
366
            raise errors.LocalRequiresBoundBranch()
 
367
        result = GitBranchPullResult()
 
368
        result.source_branch = self.source
 
369
        if _override_hook_target is None:
 
370
            result.target_branch = self.target
 
371
        else:
 
372
            result.target_branch = _override_hook_target
 
373
        self.source.lock_read()
 
374
        try:
 
375
            # We assume that during 'pull' the target repository is closer than
 
376
            # the source one.
 
377
            graph = self.target.repository.get_graph(self.source.repository)
 
378
            result.old_revno, result.old_revid = \
 
379
                self.target.last_revision_info()
 
380
            self.update_revisions(stop_revision, overwrite=overwrite, 
 
381
                graph=graph)
 
382
            result.new_git_head = self._head
 
383
            result.tag_conflicts = self.source.tags.merge_to(self.target.tags,
 
384
                overwrite)
 
385
            result.new_revno, result.new_revid = self.target.last_revision_info()
 
386
            if _hook_master:
 
387
                result.master_branch = _hook_master
 
388
                result.local_branch = result.target_branch
 
389
            else:
 
390
                result.master_branch = result.target_branch
 
391
                result.local_branch = None
 
392
            if run_hooks:
 
393
                for hook in branch.Branch.hooks['post_pull']:
 
394
                    hook(result)
 
395
        finally:
 
396
            self.source.unlock()
 
397
        return result
 
398
 
 
399
    def _basic_push(self, overwrite=False, stop_revision=None):
 
400
        result = branch.BranchPushResult()
 
401
        result.source_branch = self.source
 
402
        result.target_branch = self.target
 
403
        graph = self.target.repository.get_graph(self.source.repository)
 
404
        result.old_revno, result.old_revid = self.target.last_revision_info()
 
405
        self.update_revisions(stop_revision, overwrite=overwrite, 
 
406
            graph=graph)
 
407
        result.new_git_head = self._head
 
408
        result.tag_conflicts = self.source.tags.merge_to(self.target.tags,
 
409
            overwrite)
 
410
        result.new_revno, result.new_revid = self.target.last_revision_info()
 
411
        return result
 
412
 
 
413
 
 
414
class InterGitRemoteLocalBranch(branch.InterBranch):
 
415
    """InterBranch implementation that pulls between Git branches."""
 
416
 
 
417
    @classmethod
 
418
    def is_compatible(self, source, target):
 
419
        from bzrlib.plugins.git.remote import RemoteGitBranch
 
420
        return (isinstance(source, RemoteGitBranch) and 
 
421
                isinstance(target, LocalGitBranch))
 
422
 
 
423
    def _basic_push(self, overwrite=False, stop_revision=None):
 
424
        result = branch.BranchPushResult()
 
425
        result.source_branch = self.source
 
426
        result.target_branch = self.target
 
427
        result.old_revid = self.target.last_revision()
 
428
        refs, stop_revision = self.update_refs(stop_revision)
 
429
        self.target.generate_revision_history(stop_revision, result.old_revid)
 
430
        self.update_tags(refs)
 
431
        result.new_revid = self.target.last_revision()
 
432
        return result
 
433
 
 
434
    def update_tags(self, refs):
 
435
        for name, revid in extract_tags(refs, self.target.mapping).iteritems():
 
436
            self.target.tags.set_tag(name, revid)
 
437
 
 
438
    def update_refs(self, stop_revision=None):
 
439
        interrepo = repository.InterRepository.get(self.source.repository, 
 
440
            self.target.repository)
 
441
        if stop_revision is None:
 
442
            refs = interrepo.fetch_refs(branches=["HEAD"])
 
443
            stop_revision = self.target.mapping.revision_id_foreign_to_bzr(refs["HEAD"])
 
444
        else:
 
445
            refs = interrepo.fetch_refs(revision_id=stop_revision)
 
446
        return refs, stop_revision
 
447
 
 
448
    def pull(self, stop_revision=None, overwrite=False, 
 
449
        possible_transports=None, local=False):
 
450
        # This type of branch can't be bound.
 
451
        if local:
 
452
            raise errors.LocalRequiresBoundBranch()
 
453
        result = GitPullResult()
 
454
        result.source_branch = self.source
 
455
        result.target_branch = self.target
 
456
        result.old_revid = self.target.last_revision()
 
457
        refs, stop_revision = self.update_refs(stop_revision)
 
458
        self.target.generate_revision_history(stop_revision, result.old_revid)
 
459
        self.update_tags(refs)
 
460
        result.new_revid = self.target.last_revision()
 
461
        return result
 
462
 
 
463
    
 
464
class InterToGitBranch(branch.InterBranch):
 
465
    """InterBranch implementation that pulls from Git into bzr."""
 
466
 
 
467
    @classmethod
 
468
    def is_compatible(self, source, target):
 
469
        return (not isinstance(source, GitBranch) and 
 
470
                isinstance(target, GitBranch))
 
471
 
 
472
    def push(self, overwrite=True, stop_revision=None, 
 
473
             _override_hook_source_branch=None):
 
474
        raise NoPushSupport()
 
475
 
 
476
    def lossy_push(self, stop_revision=None):
 
477
        result = GitBranchPushResult()
 
478
        result.source_branch = self.source
 
479
        result.target_branch = self.target
 
480
        result.old_revid = self.target.last_revision()
 
481
        if stop_revision is None:
 
482
            stop_revision = self.source.last_revision()
 
483
        # FIXME: Check for diverged branches
 
484
        refs = { "refs/heads/master": stop_revision }
 
485
        for name, revid in self.source.tags.get_tag_dict().iteritems():
 
486
            if self.source.repository.has_revision(revid):
 
487
                refs["refs/tags/%s" % name] = revid
 
488
        revidmap, new_refs = self.target.repository.dfetch_refs(
 
489
            self.source.repository, refs)
 
490
        if revidmap != {}:
 
491
            self.target.generate_revision_history(revidmap[stop_revision])
 
492
        result.new_revid = self.target.last_revision()
 
493
        result.revidmap = revidmap
 
494
        return result
 
495
 
 
496
 
 
497
branch.InterBranch.register_optimiser(InterGitRemoteLocalBranch)
 
498
branch.InterBranch.register_optimiser(InterFromGitBranch)
 
499
branch.InterBranch.register_optimiser(InterToGitBranch)