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Viewing changes to breezy/git/__init__.py

  • Committer: Jelmer Vernooij
  • Date: 2018-11-16 23:19:12 UTC
  • mfrom: (7180 work)
  • mto: This revision was merged to the branch mainline in revision 7294.
  • Revision ID: jelmer@jelmer.uk-20181116231912-e043vpq22bdkxa6q
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breezy/git/__init__.py
 
1
# Copyright (C) 2009-2018 Jelmer Vernooij <jelmer@jelmer.uk>
 
2
# Copyright (C) 2006-2009 Canonical Ltd
 
3
 
 
4
# Authors: Robert Collins <robert.collins@canonical.com>
 
5
#          Jelmer Vernooij <jelmer@jelmer.uk>
 
6
#          John Carr <john.carr@unrouted.co.uk>
 
7
#
 
8
# This program is free software; you can redistribute it and/or modify
 
9
# it under the terms of the GNU General Public License as published by
 
10
# the Free Software Foundation; either version 2 of the License, or
 
11
# (at your option) any later version.
 
12
#
 
13
# This program is distributed in the hope that it will be useful,
 
14
# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
15
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
16
# GNU General Public License for more details.
 
17
#
 
18
# You should have received a copy of the GNU General Public License
 
19
# along with this program; if not, write to the Free Software
 
20
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
21
 
 
22
 
 
23
"""A GIT branch and repository format implementation for bzr."""
 
24
 
 
25
from __future__ import absolute_import
 
26
 
 
27
import os
 
28
import sys
 
29
 
 
30
dulwich_minimum_version = (0, 19, 7)
 
31
 
 
32
from .. import (  # noqa: F401
 
33
    __version__ as breezy_version,
 
34
    errors as brz_errors,
 
35
    trace,
 
36
    version_info,
 
37
    )
 
38
 
 
39
from ..controldir import (
 
40
    ControlDirFormat,
 
41
    Prober,
 
42
    format_registry,
 
43
    network_format_registry as controldir_network_format_registry,
 
44
    )
 
45
 
 
46
from ..transport import (
 
47
    register_lazy_transport,
 
48
    register_transport_proto,
 
49
    transport_server_registry,
 
50
    )
 
51
from ..commands import (
 
52
    plugin_cmds,
 
53
    )
 
54
 
 
55
 
 
56
if getattr(sys, "frozen", None):
 
57
    # allow import additional libs from ./_lib for bzr.exe only
 
58
    sys.path.append(os.path.normpath(
 
59
        os.path.join(os.path.dirname(__file__), '_lib')))
 
60
 
 
61
 
 
62
def import_dulwich():
 
63
    try:
 
64
        from dulwich import __version__ as dulwich_version
 
65
    except ImportError:
 
66
        raise brz_errors.DependencyNotPresent(
 
67
            "dulwich",
 
68
            "bzr-git: Please install dulwich, https://www.dulwich.io/")
 
69
    else:
 
70
        if dulwich_version < dulwich_minimum_version:
 
71
            raise brz_errors.DependencyNotPresent(
 
72
                "dulwich",
 
73
                "bzr-git: Dulwich is too old; at least %d.%d.%d is required" %
 
74
                dulwich_minimum_version)
 
75
 
 
76
 
 
77
_versions_checked = False
 
78
 
 
79
 
 
80
def lazy_check_versions():
 
81
    global _versions_checked
 
82
    if _versions_checked:
 
83
        return
 
84
    import_dulwich()
 
85
    _versions_checked = True
 
86
 
 
87
 
 
88
format_registry.register_lazy(
 
89
    'git', __name__ + ".dir", "LocalGitControlDirFormat",
 
90
    help='GIT repository.', native=False, experimental=False)
 
91
 
 
92
format_registry.register_lazy(
 
93
    'git-bare', __name__ + ".dir", "BareLocalGitControlDirFormat",
 
94
    help='Bare GIT repository (no working tree).', native=False,
 
95
    experimental=False)
 
96
 
 
97
from ..revisionspec import (RevisionSpec_dwim, revspec_registry)
 
98
revspec_registry.register_lazy("git:", __name__ + ".revspec",
 
99
                               "RevisionSpec_git")
 
100
RevisionSpec_dwim.append_possible_lazy_revspec(
 
101
    __name__ + ".revspec", "RevisionSpec_git")
 
102
 
 
103
 
 
104
class LocalGitProber(Prober):
 
105
 
 
106
    def probe_transport(self, transport):
 
107
        try:
 
108
            external_url = transport.external_url()
 
109
        except brz_errors.InProcessTransport:
 
110
            raise brz_errors.NotBranchError(path=transport.base)
 
111
        if (external_url.startswith("http:") or
 
112
                external_url.startswith("https:")):
 
113
            # Already handled by RemoteGitProber
 
114
            raise brz_errors.NotBranchError(path=transport.base)
 
115
        from .. import urlutils
 
116
        if urlutils.split(transport.base)[1] == ".git":
 
117
            raise brz_errors.NotBranchError(path=transport.base)
 
118
        if not transport.has_any(['objects', '.git/objects', '.git']):
 
119
            raise brz_errors.NotBranchError(path=transport.base)
 
120
        lazy_check_versions()
 
121
        from .dir import (
 
122
            BareLocalGitControlDirFormat,
 
123
            LocalGitControlDirFormat,
 
124
            )
 
125
        if transport.has_any(['.git/objects', '.git']):
 
126
            return LocalGitControlDirFormat()
 
127
        if transport.has('info') and transport.has('objects'):
 
128
            return BareLocalGitControlDirFormat()
 
129
        raise brz_errors.NotBranchError(path=transport.base)
 
130
 
 
131
    @classmethod
 
132
    def known_formats(cls):
 
133
        from .dir import (
 
134
            BareLocalGitControlDirFormat,
 
135
            LocalGitControlDirFormat,
 
136
            )
 
137
        return [BareLocalGitControlDirFormat(), LocalGitControlDirFormat()]
 
138
 
 
139
 
 
140
def user_agent_for_github():
 
141
    # GitHub requires we lie. https://github.com/dulwich/dulwich/issues/562
 
142
    return "git/Breezy/%s" % breezy_version
 
143
 
 
144
 
 
145
class RemoteGitProber(Prober):
 
146
 
 
147
    def probe_http_transport(self, transport):
 
148
        from .. import urlutils
 
149
        base_url, _ = urlutils.split_segment_parameters(
 
150
            transport.external_url())
 
151
        url = urlutils.join(base_url, "info/refs") + "?service=git-upload-pack"
 
152
        from ..transport.http import Request
 
153
        headers = {"Content-Type": "application/x-git-upload-pack-request",
 
154
                   "Accept": "application/x-git-upload-pack-result",
 
155
                   }
 
156
        req = Request('GET', url, accepted_errors=[200, 403, 404, 405],
 
157
                      headers=headers)
 
158
        (scheme, user, password, host, port,
 
159
         path) = urlutils.parse_url(req.get_full_url())
 
160
        if host == "github.com":
 
161
            # GitHub requires we lie.
 
162
            # https://github.com/dulwich/dulwich/issues/562
 
163
            req.add_header("User-Agent", user_agent_for_github())
 
164
        elif host == "bazaar.launchpad.net":
 
165
            # Don't attempt Git probes against bazaar.launchpad.net; pad.lv/1744830
 
166
            raise brz_errors.NotBranchError(transport.base)
 
167
        resp = transport._perform(req)
 
168
        if resp.code in (404, 405):
 
169
            raise brz_errors.NotBranchError(transport.base)
 
170
        headers = resp.headers
 
171
        ct = headers.get("Content-Type")
 
172
        if ct is None:
 
173
            raise brz_errors.NotBranchError(transport.base)
 
174
        if ct.startswith("application/x-git"):
 
175
            from .remote import RemoteGitControlDirFormat
 
176
            return RemoteGitControlDirFormat()
 
177
        else:
 
178
            from .dir import (
 
179
                BareLocalGitControlDirFormat,
 
180
                )
 
181
            ret = BareLocalGitControlDirFormat()
 
182
            ret._refs_text = resp.read()
 
183
            return ret
 
184
 
 
185
    def probe_transport(self, transport):
 
186
        try:
 
187
            external_url = transport.external_url()
 
188
        except brz_errors.InProcessTransport:
 
189
            raise brz_errors.NotBranchError(path=transport.base)
 
190
 
 
191
        if (external_url.startswith("http:") or
 
192
                external_url.startswith("https:")):
 
193
            return self.probe_http_transport(transport)
 
194
 
 
195
        if (not external_url.startswith("git://") and
 
196
                not external_url.startswith("git+")):
 
197
            raise brz_errors.NotBranchError(transport.base)
 
198
 
 
199
        # little ugly, but works
 
200
        from .remote import (
 
201
            GitSmartTransport,
 
202
            RemoteGitControlDirFormat,
 
203
            )
 
204
        if isinstance(transport, GitSmartTransport):
 
205
            return RemoteGitControlDirFormat()
 
206
        raise brz_errors.NotBranchError(path=transport.base)
 
207
 
 
208
    @classmethod
 
209
    def known_formats(cls):
 
210
        from .remote import RemoteGitControlDirFormat
 
211
        return [RemoteGitControlDirFormat()]
 
212
 
 
213
 
 
214
ControlDirFormat.register_prober(LocalGitProber)
 
215
ControlDirFormat._server_probers.append(RemoteGitProber)
 
216
 
 
217
register_transport_proto(
 
218
    'git://', help="Access using the Git smart server protocol.")
 
219
register_transport_proto(
 
220
    'git+ssh://',
 
221
    help="Access using the Git smart server protocol over SSH.")
 
222
 
 
223
register_lazy_transport("git://", __name__ + '.remote',
 
224
                        'TCPGitSmartTransport')
 
225
register_lazy_transport("git+ssh://", __name__ + '.remote',
 
226
                        'SSHGitSmartTransport')
 
227
 
 
228
 
 
229
plugin_cmds.register_lazy("cmd_git_import", [], __name__ + ".commands")
 
230
plugin_cmds.register_lazy("cmd_git_object", ["git-objects", "git-cat"],
 
231
                          __name__ + ".commands")
 
232
plugin_cmds.register_lazy("cmd_git_refs", [], __name__ + ".commands")
 
233
plugin_cmds.register_lazy("cmd_git_apply", [], __name__ + ".commands")
 
234
plugin_cmds.register_lazy("cmd_git_push_pristine_tar_deltas",
 
235
                          ['git-push-pristine-tar', 'git-push-pristine'],
 
236
                          __name__ + ".commands")
 
237
 
 
238
 
 
239
def extract_git_foreign_revid(rev):
 
240
    try:
 
241
        foreign_revid = rev.foreign_revid
 
242
    except AttributeError:
 
243
        from .mapping import mapping_registry
 
244
        foreign_revid, mapping = \
 
245
            mapping_registry.parse_revision_id(rev.revision_id)
 
246
        return foreign_revid
 
247
    else:
 
248
        from .mapping import foreign_vcs_git
 
249
        if rev.mapping.vcs == foreign_vcs_git:
 
250
            return foreign_revid
 
251
        else:
 
252
            raise brz_errors.InvalidRevisionId(rev.revision_id, None)
 
253
 
 
254
 
 
255
def update_stanza(rev, stanza):
 
256
    try:
 
257
        git_commit = extract_git_foreign_revid(rev)
 
258
    except brz_errors.InvalidRevisionId:
 
259
        pass
 
260
    else:
 
261
        stanza.add("git-commit", git_commit)
 
262
 
 
263
 
 
264
from ..hooks import install_lazy_named_hook
 
265
install_lazy_named_hook(
 
266
    "breezy.version_info_formats.format_rio",
 
267
    "RioVersionInfoBuilder.hooks", "revision", update_stanza,
 
268
    "git commits")
 
269
 
 
270
transport_server_registry.register_lazy(
 
271
    'git', __name__ + '.server', 'serve_git',
 
272
    'Git Smart server protocol over TCP. (default port: 9418)')
 
273
 
 
274
transport_server_registry.register_lazy(
 
275
    'git-receive-pack', __name__ + '.server',
 
276
    'serve_git_receive_pack',
 
277
    help='Git Smart server receive pack command. (inetd mode only)')
 
278
transport_server_registry.register_lazy(
 
279
    'git-upload-pack', __name__ + 'git.server',
 
280
    'serve_git_upload_pack',
 
281
    help='Git Smart server upload pack command. (inetd mode only)')
 
282
 
 
283
from ..repository import (
 
284
    format_registry as repository_format_registry,
 
285
    network_format_registry as repository_network_format_registry,
 
286
    )
 
287
repository_network_format_registry.register_lazy(
 
288
    b'git', __name__ + '.repository', 'GitRepositoryFormat')
 
289
 
 
290
register_extra_lazy_repository_format = getattr(repository_format_registry,
 
291
                                                "register_extra_lazy")
 
292
register_extra_lazy_repository_format(__name__ + '.repository',
 
293
                                      'GitRepositoryFormat')
 
294
 
 
295
from ..branch import (
 
296
    network_format_registry as branch_network_format_registry,
 
297
    )
 
298
branch_network_format_registry.register_lazy(
 
299
    b'git', __name__ + '.branch', 'LocalGitBranchFormat')
 
300
 
 
301
 
 
302
from ..branch import (
 
303
    format_registry as branch_format_registry,
 
304
    )
 
305
branch_format_registry.register_extra_lazy(
 
306
    __name__ + '.branch',
 
307
    'LocalGitBranchFormat',
 
308
    )
 
309
branch_format_registry.register_extra_lazy(
 
310
    __name__ + '.remote',
 
311
    'RemoteGitBranchFormat',
 
312
    )
 
313
 
 
314
 
 
315
from ..workingtree import (
 
316
    format_registry as workingtree_format_registry,
 
317
    )
 
318
workingtree_format_registry.register_extra_lazy(
 
319
    __name__ + '.workingtree',
 
320
    'GitWorkingTreeFormat',
 
321
    )
 
322
 
 
323
controldir_network_format_registry.register_lazy(
 
324
    b'git', __name__ + ".dir", "GitControlDirFormat")
 
325
 
 
326
 
 
327
from ..diff import format_registry as diff_format_registry
 
328
diff_format_registry.register_lazy(
 
329
    'git', __name__ + '.send',
 
330
    'GitDiffTree', 'Git am-style diff format')
 
331
 
 
332
from ..send import (
 
333
    format_registry as send_format_registry,
 
334
    )
 
335
send_format_registry.register_lazy('git', __name__ + '.send',
 
336
                                   'send_git', 'Git am-style diff format')
 
337
 
 
338
from ..directory_service import directories
 
339
directories.register_lazy('github:', __name__ + '.directory',
 
340
                          'GitHubDirectory',
 
341
                          'GitHub directory.')
 
342
directories.register_lazy('git@github.com:', __name__ + '.directory',
 
343
                          'GitHubDirectory',
 
344
                          'GitHub directory.')
 
345
 
 
346
from ..help_topics import (
 
347
    topic_registry,
 
348
    )
 
349
topic_registry.register_lazy(
 
350
    'git', __name__ + '.help', 'help_git', 'Using Bazaar with Git')
 
351
 
 
352
from ..foreign import (
 
353
    foreign_vcs_registry,
 
354
    )
 
355
foreign_vcs_registry.register_lazy(
 
356
    "git", __name__ + ".mapping", "foreign_vcs_git", "Stupid content tracker")
 
357
 
 
358
 
 
359
def update_git_cache(repository, revid):
 
360
    """Update the git cache after a local commit."""
 
361
    if getattr(repository, "_git", None) is not None:
 
362
        return  # No need to update cache for git repositories
 
363
 
 
364
    if not repository.control_transport.has("git"):
 
365
        return  # No existing cache, don't bother updating
 
366
    try:
 
367
        lazy_check_versions()
 
368
    except brz_errors.DependencyNotPresent as e:
 
369
        # dulwich is probably missing. silently ignore
 
370
        trace.mutter("not updating git map for %r: %s",
 
371
                     repository, e)
 
372
 
 
373
    from .object_store import BazaarObjectStore
 
374
    store = BazaarObjectStore(repository)
 
375
    with store.lock_write():
 
376
        try:
 
377
            parent_revisions = set(repository.get_parent_map([revid])[revid])
 
378
        except KeyError:
 
379
            # Isn't this a bit odd - how can a revision that was just committed
 
380
            # be missing?
 
381
            return
 
382
        missing_revisions = store._missing_revisions(parent_revisions)
 
383
        if not missing_revisions:
 
384
            store._cache.idmap.start_write_group()
 
385
            try:
 
386
                # Only update if the cache was up to date previously
 
387
                store._update_sha_map_revision(revid)
 
388
            except BaseException:
 
389
                store._cache.idmap.abort_write_group()
 
390
                raise
 
391
            else:
 
392
                store._cache.idmap.commit_write_group()
 
393
 
 
394
 
 
395
def post_commit_update_cache(local_branch, master_branch, old_revno, old_revid,
 
396
                             new_revno, new_revid):
 
397
    if local_branch is not None:
 
398
        update_git_cache(local_branch.repository, new_revid)
 
399
    update_git_cache(master_branch.repository, new_revid)
 
400
 
 
401
 
 
402
def loggerhead_git_hook(branch_app, environ):
 
403
    branch = branch_app.branch
 
404
    config_stack = branch.get_config_stack()
 
405
    if config_stack.get('http_git'):
 
406
        return None
 
407
    from .server import git_http_hook
 
408
    return git_http_hook(branch, environ['REQUEST_METHOD'],
 
409
                         environ['PATH_INFO'])
 
410
 
 
411
 
 
412
install_lazy_named_hook("breezy.branch",
 
413
                        "Branch.hooks", "post_commit",
 
414
                        post_commit_update_cache, "git cache")
 
415
install_lazy_named_hook("breezy.plugins.loggerhead.apps.branch",
 
416
                        "BranchWSGIApp.hooks", "controller",
 
417
                        loggerhead_git_hook, "git support")
 
418
 
 
419
 
 
420
from ..config import (
 
421
    option_registry,
 
422
    Option,
 
423
    bool_from_store,
 
424
    )
 
425
 
 
426
option_registry.register(
 
427
    Option('git.http',
 
428
           default=None, from_unicode=bool_from_store, invalid='warning',
 
429
           help='''\
 
430
Allow fetching of Git packs over HTTP.
 
431
 
 
432
This enables support for fetching Git packs over HTTP in Loggerhead.
 
433
'''))
 
434
 
 
435
 
 
436
def test_suite():
 
437
    from . import tests
 
438
    return tests.test_suite()