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branch.py
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# Copyright (C) 2007 Canonical Ltd
 
2
# Copyright (C) 2009 Jelmer Vernooij <jelmer@samba.org>
2
3
#
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4
# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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"""An adapter between a Git Branch and a Bazaar Branch"""
18
19
 
 
20
from dulwich.objects import (
 
21
    Commit,
 
22
    Tag,
 
23
    )
 
24
 
19
25
from bzrlib import (
20
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    branch,
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27
    config,
 
28
    foreign,
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29
    repository,
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30
    revision,
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31
    tag,
25
 
    )
26
 
from bzrlib.decorators import needs_read_lock
27
 
from bzrlib.trace import mutter
28
 
 
29
 
from bzrlib.plugins.git.foreign import ForeignBranch
30
 
from bzrlib.plugins.git.errors import LightWeightCheckoutsNotSupported
31
 
 
32
 
from dulwich.objects import (
33
 
        Commit,
34
 
        Tag,
35
 
        )
36
 
 
37
 
class GitTagDict(tag.BasicTags):
 
32
    transport,
 
33
    )
 
34
from bzrlib.decorators import (
 
35
    needs_read_lock,
 
36
    )
 
37
from bzrlib.trace import (
 
38
    mutter,
 
39
    )
 
40
 
 
41
from bzrlib.plugins.git.errors import (
 
42
    NoSuchRef,
 
43
    )
 
44
 
 
45
 
 
46
class GitPullResult(branch.PullResult):
 
47
 
 
48
    def _lookup_revno(self, revid):
 
49
        assert isinstance(revid, str), "was %r" % revid
 
50
        # Try in source branch first, it'll be faster
 
51
        return self.target_branch.revision_id_to_revno(revid)
 
52
 
 
53
    @property
 
54
    def old_revno(self):
 
55
        return self._lookup_revno(self.old_revid)
 
56
 
 
57
    @property
 
58
    def new_revno(self):
 
59
        return self._lookup_revno(self.new_revid)
 
60
 
 
61
 
 
62
class LocalGitTagDict(tag.BasicTags):
 
63
    """Dictionary with tags in a local repository."""
38
64
 
39
65
    def __init__(self, branch):
40
66
        self.branch = branch
48
74
                v = obj.object[1]
49
75
                obj = self.repository._git.get_object(v)
50
76
            if not isinstance(obj, Commit):
51
 
                mutter("Tag %s points at object %r that is not a commit, ignoring", k, obj)
 
77
                mutter("Tag %s points at object %r that is not a commit, "
 
78
                       "ignoring", k, obj)
52
79
                continue
53
80
            ret[k] = self.branch.mapping.revision_id_foreign_to_bzr(v)
54
81
        return ret
65
92
        # do not provide a BranchDataConfig
66
93
        self.option_sources = self.option_sources[0], self.option_sources[2]
67
94
 
68
 
    def set_user_option(self, name, value, store=config.STORE_BRANCH, warn_masked=False):
 
95
    def set_user_option(self, name, value, store=config.STORE_BRANCH,
 
96
            warn_masked=False):
69
97
        """Force local to True"""
70
 
        config.BranchConfig.set_user_option(self, name, value, store=config.STORE_LOCATION, warn_masked=warn_masked)
 
98
        config.BranchConfig.set_user_option(self, name, value,
 
99
            store=config.STORE_LOCATION, warn_masked=warn_masked)
71
100
 
72
101
 
73
102
class GitBranchFormat(branch.BranchFormat):
78
107
    def supports_tags(self):
79
108
        return True
80
109
 
81
 
 
82
 
class GitBranch(ForeignBranch):
 
110
    def make_tags(self, branch):
 
111
        if getattr(branch.repository, "get_refs", None) is not None:
 
112
            from bzrlib.plugins.git.remote import RemoteGitTagDict
 
113
            return RemoteGitTagDict(branch)
 
114
        else:
 
115
            return LocalGitTagDict(branch)
 
116
 
 
117
 
 
118
class GitBranch(foreign.ForeignBranch):
83
119
    """An adapter to git repositories for bzr Branch objects."""
84
120
 
85
121
    def __init__(self, bzrdir, repository, name, head, lockfiles):
86
122
        self.repository = repository
87
 
        super(GitBranch, self).__init__(repository.get_mapping())
 
123
        self._format = GitBranchFormat()
88
124
        self.control_files = lockfiles
89
125
        self.bzrdir = bzrdir
 
126
        super(GitBranch, self).__init__(repository.get_mapping())
90
127
        self.name = name
91
128
        self.head = head
92
129
        self.base = bzrdir.transport.base
93
 
        self._format = GitBranchFormat()
 
130
 
 
131
    def _get_nick(self, local=False, possible_master_transports=None):
 
132
        """Find the nick name for this branch.
 
133
 
 
134
        :return: Branch nick
 
135
        """
 
136
        return self.name
 
137
 
 
138
    def _set_nick(self, nick):
 
139
        raise NotImplementedError
 
140
 
 
141
    nick = property(_get_nick, _set_nick)
94
142
 
95
143
    def dpull(self, source, stop_revision=None):
96
144
        if stop_revision is None:
97
145
            stop_revision = source.last_revision()
98
146
        # FIXME: Check for diverged branches
99
147
        revidmap = self.repository.dfetch(source.repository, stop_revision)
100
 
        self.head, self.mapping = self.mapping.revision_id_bzr_to_foreign(revidmap[stop_revision])
 
148
        self.generate_revision_history(revidmap[stop_revision])
101
149
        return revidmap
102
150
 
 
151
    def generate_revision_history(self, revid, old_revid=None):
 
152
        # FIXME: Check that old_revid is in the ancestry of revid
 
153
        newhead, self.mapping = self.mapping.revision_id_bzr_to_foreign(revid)
 
154
        self._set_head(newhead)
 
155
 
 
156
    def _set_head(self, head):
 
157
        self.repository._git.set_ref(self.name, self.head)
 
158
        self.head = head
 
159
 
103
160
    def lock_write(self):
104
161
        self.control_files.lock_write()
105
162
 
109
166
 
110
167
    def get_parent(self):
111
168
        """See Branch.get_parent()."""
 
169
        # FIXME: Set "origin" url from .git/config ?
112
170
        return None
113
171
 
114
172
    def set_parent(self, url):
 
173
        # FIXME: Set "origin" url in .git/config ?
115
174
        pass
116
175
 
117
176
    def lock_read(self):
125
184
 
126
185
 
127
186
class LocalGitBranch(GitBranch):
 
187
    """A local Git branch."""
128
188
 
129
189
    @needs_read_lock
130
190
    def last_revision(self):
133
193
            return revision.NULL_REVISION
134
194
        return self.mapping.revision_id_foreign_to_bzr(self.head)
135
195
 
136
 
    def create_checkout(self, to_location, revision_id=None, 
137
 
                        lightweight=False, accelerator_tree=None, hardlink=False):
 
196
    def _get_checkout_format(self):
 
197
        """Return the most suitable metadir for a checkout of this branch.
 
198
        Weaves are used if this branch's repository uses weaves.
 
199
        """
 
200
        format = self.repository.bzrdir.checkout_metadir()
 
201
        format.set_branch_format(self._format)
 
202
        return format
 
203
 
 
204
    def create_checkout(self, to_location, revision_id=None, lightweight=False,
 
205
        accelerator_tree=None, hardlink=False):
138
206
        if lightweight:
139
 
            raise LightWeightCheckoutsNotSupported()
140
 
        return self._create_heavyweight_checkout(to_location, revision_id, hardlink)
 
207
            t = transport.get_transport(to_location)
 
208
            t.ensure_base()
 
209
            format = self._get_checkout_format()
 
210
            checkout = format.initialize_on_transport(t)
 
211
            from_branch = branch.BranchReferenceFormat().initialize(checkout, 
 
212
                self)
 
213
            tree = checkout.create_workingtree(revision_id,
 
214
                from_branch=from_branch, hardlink=hardlink)
 
215
            return tree
 
216
        else:
 
217
            return self._create_heavyweight_checkout(to_location, revision_id,
 
218
            hardlink)
141
219
 
142
220
    def _create_heavyweight_checkout(self, to_location, revision_id=None, 
143
221
                                     hardlink=False):
157
235
        checkout_branch.pull(self, stop_revision=revision_id)
158
236
        return checkout.create_workingtree(revision_id, hardlink=hardlink)
159
237
 
160
 
    def _make_tags(self):
161
 
        return GitTagDict(self)
162
 
 
163
238
    def _gen_revision_history(self):
164
239
        if self.head is None:
165
240
            return []
166
 
        ret = list(self.repository.iter_reverse_revision_history(self.last_revision()))
 
241
        ret = list(self.repository.iter_reverse_revision_history(
 
242
            self.last_revision()))
167
243
        ret.reverse()
168
244
        return ret
169
245
 
183
259
    def supports_tags(self):
184
260
        return True
185
261
 
186
 
    def sprout(self, to_bzrdir, revision_id=None):
187
 
        """See Branch.sprout()."""
188
 
        result = to_bzrdir.create_branch()
189
 
        self.copy_content_into(result, revision_id=revision_id)
190
 
        result.set_parent(self.bzrdir.root_transport.base)
191
 
        return result
192
 
 
193
262
 
194
263
class InterGitGenericBranch(branch.InterBranch):
 
264
    """InterBranch implementation that pulls from Git into bzr."""
195
265
 
196
266
    @classmethod
197
267
    def is_compatible(self, source, target):
198
 
        return isinstance(source, GitBranch)
 
268
        return (isinstance(source, GitBranch) and 
 
269
                not isinstance(target, GitBranch))
199
270
 
200
271
    def update_revisions(self, stop_revision=None, overwrite=False,
201
272
        graph=None):
202
273
        """See InterBranch.update_revisions()."""
203
 
        # TODO: stop_revision, overwrite
204
 
        interrepo = repository.InterRepository.get(self.source.repository, self.target.repository)
 
274
        interrepo = repository.InterRepository.get(self.source.repository, 
 
275
            self.target.repository)
205
276
        self._last_revid = None
206
277
        def determine_wants(heads):
207
278
            if not self.source.name in heads:
208
 
                raise BzrError("No such remote branch '%s', found: %r" % (
209
 
                    self.source.name, heads.keys()))
210
 
            head = heads[self.source.name]
211
 
            self._last_revid = self.source.mapping.revision_id_foreign_to_bzr(head)
 
279
                raise NoSuchRef(self.source.name, heads.keys())
 
280
            if stop_revision is not None:
 
281
                self._last_revid = stop_revision
 
282
                head, mapping = self.source.repository.lookup_git_revid(
 
283
                    stop_revision)
 
284
            else:
 
285
                head = heads[self.source.name]
 
286
                self._last_revid = \
 
287
                    self.source.mapping.revision_id_foreign_to_bzr(head)
212
288
            if self.target.repository.has_revision(self._last_revid):
213
289
                return []
214
290
            return [head]
215
291
        interrepo.fetch_objects(determine_wants, self.source.mapping)
216
 
        self.target.generate_revision_history(self._last_revid)
 
292
        if overwrite:
 
293
            prev_last_revid = None
 
294
        else:
 
295
            prev_last_revid = self.target.last_revision()
 
296
        self.target.generate_revision_history(self._last_revid, prev_last_revid)
217
297
 
218
298
 
219
299
branch.InterBranch.register_optimiser(InterGitGenericBranch)
 
300
 
 
301
 
 
302
class InterGitRemoteLocalBranch(branch.InterBranch):
 
303
    """InterBranch implementation that pulls between Git branches."""
 
304
 
 
305
    @classmethod
 
306
    def is_compatible(self, source, target):
 
307
        from bzrlib.plugins.git.remote import RemoteGitBranch
 
308
        return (isinstance(source, RemoteGitBranch) and 
 
309
                isinstance(target, LocalGitBranch))
 
310
 
 
311
    def pull(self, stop_revision=None, overwrite=False, 
 
312
        possible_transports=None):
 
313
        result = GitPullResult()
 
314
        result.source_branch = self.source
 
315
        result.target_branch = self.target
 
316
        interrepo = repository.InterRepository.get(self.source.repository, 
 
317
            self.target.repository)
 
318
        result.old_revid = self.target.last_revision()
 
319
        if stop_revision is None:
 
320
            stop_revision = self.source.last_revision()
 
321
        interrepo.fetch(revision_id=stop_revision)
 
322
        self.target.generate_revision_history(stop_revision, result.old_revid)
 
323
        result.new_revid = self.target.last_revision()
 
324
        return result
 
325
 
 
326
 
 
327
branch.InterBranch.register_optimiser(InterGitRemoteLocalBranch)