~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
# Copyright (C) 2009-2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Tools for dealing with the Launchpad API."""

from __future__ import absolute_import

# Importing this module will be expensive, since it imports launchpadlib and
# its dependencies. However, our plan is to only load this module when it is
# needed by a command that uses it.


import httplib2
import os
import re
import urlparse

from bzrlib import (
    branch,
    config,
    errors,
    osutils,
    trace,
    transport,
    )
from bzrlib.i18n import gettext
from bzrlib.plugins.launchpad.lp_registration import (
    InvalidLaunchpadInstance,
    )

try:
    import launchpadlib
except ImportError, e:
    raise errors.DependencyNotPresent('launchpadlib', e)

from launchpadlib.launchpad import (
    STAGING_SERVICE_ROOT,
    Launchpad,
    )
from launchpadlib import uris

# Declare the minimum version of launchpadlib that we need in order to work.
# 1.6.0 is the version of launchpadlib packaged in Ubuntu 10.04, the most
# recent Ubuntu LTS release supported on the desktop at the time of writing.
MINIMUM_LAUNCHPADLIB_VERSION = (1, 6, 0)


def get_cache_directory():
    """Return the directory to cache launchpadlib objects in."""
    return osutils.pathjoin(config.config_dir(), 'launchpad')


def parse_launchpadlib_version(version_number):
    """Parse a version number of the style used by launchpadlib."""
    return tuple(map(int, version_number.split('.')))


def check_launchpadlib_compatibility():
    """Raise an error if launchpadlib has the wrong version number."""
    installed_version = parse_launchpadlib_version(launchpadlib.__version__)
    if installed_version < MINIMUM_LAUNCHPADLIB_VERSION:
        raise errors.IncompatibleAPI(
            'launchpadlib', MINIMUM_LAUNCHPADLIB_VERSION,
            installed_version, installed_version)


def lookup_service_root(service_root):
    try:
        return uris.lookup_service_root(service_root)
    except ValueError:
        if service_root != 'qastaging':
            raise
        staging_root = uris.lookup_service_root('staging')
        return staging_root.replace('staging', 'qastaging')


def _get_api_url(service):
    """Return the root URL of the Launchpad API.

    e.g. For the 'staging' Launchpad service, this function returns
    launchpadlib.launchpad.STAGING_SERVICE_ROOT.

    :param service: A `LaunchpadService` object.
    :return: A URL as a string.
    """
    if service._lp_instance is None:
        lp_instance = service.DEFAULT_INSTANCE
    else:
        lp_instance = service._lp_instance
    try:
        return lookup_service_root(lp_instance)
    except ValueError:
        raise InvalidLaunchpadInstance(lp_instance)


class NoLaunchpadBranch(errors.BzrError):
    _fmt = 'No launchpad branch could be found for branch "%(url)s".'

    def __init__(self, branch):
        errors.BzrError.__init__(self, branch=branch, url=branch.base)


def login(service, timeout=None, proxy_info=None,
          version=Launchpad.DEFAULT_VERSION):
    """Log in to the Launchpad API.

    :return: The root `Launchpad` object from launchpadlib.
    """
    if proxy_info is None:
        proxy_info = httplib2.proxy_info_from_environment('https')
    cache_directory = get_cache_directory()
    launchpad = Launchpad.login_with(
        'bzr', _get_api_url(service), cache_directory, timeout=timeout,
        proxy_info=proxy_info, version=version)
    # XXX: Work-around a minor security bug in launchpadlib < 1.6.3, which
    # would create this directory with default umask.
    osutils.chmod_if_possible(cache_directory, 0700)
    return launchpad


class LaunchpadBranch(object):
    """Provide bzr and lp API access to a Launchpad branch."""

    def __init__(self, lp_branch, bzr_url, bzr_branch=None, check_update=True):
        """Constructor.

        :param lp_branch: The Launchpad branch.
        :param bzr_url: The URL of the Bazaar branch.
        :param bzr_branch: An instance of the Bazaar branch.
        """
        self.bzr_url = bzr_url
        self._bzr = bzr_branch
        self._push_bzr = None
        self._check_update = check_update
        self.lp = lp_branch

    @property
    def bzr(self):
        """Return the bzr branch for this branch."""
        if self._bzr is None:
            self._bzr = branch.Branch.open(self.bzr_url)
        return self._bzr

    @property
    def push_bzr(self):
        """Return the push branch for this branch."""
        if self._push_bzr is None:
            self._push_bzr = branch.Branch.open(self.lp.bzr_identity)
        return self._push_bzr

    @staticmethod
    def plausible_launchpad_url(url):
        """Is 'url' something that could conceivably be pushed to LP?

        :param url: A URL that may refer to a Launchpad branch.
        :return: A boolean.
        """
        if url is None:
            return False
        if url.startswith('lp:'):
            return True
        regex = re.compile('([a-z]*\+)*(bzr\+ssh|http)'
                           '://bazaar.*.launchpad.net')
        return bool(regex.match(url))

    @staticmethod
    def candidate_urls(bzr_branch):
        """Iterate through related URLs that might be Launchpad URLs.

        :param bzr_branch: A Bazaar branch to find URLs from.
        :return: a generator of URL strings.
        """
        url = bzr_branch.get_public_branch()
        if url is not None:
            yield url
        url = bzr_branch.get_push_location()
        if url is not None:
            yield url
        url = bzr_branch.get_parent()
        if url is not None:
            yield url
        yield bzr_branch.base

    @staticmethod
    def tweak_url(url, launchpad):
        """Adjust a URL to work with staging, if needed."""
        if str(launchpad._root_uri) == STAGING_SERVICE_ROOT:
            return url.replace('bazaar.launchpad.net',
                               'bazaar.staging.launchpad.net')
        elif str(launchpad._root_uri) == lookup_service_root('qastaging'):
            return url.replace('bazaar.launchpad.net',
                               'bazaar.qastaging.launchpad.net')
        return url

    @classmethod
    def from_bzr(cls, launchpad, bzr_branch, create_missing=True):
        """Find a Launchpad branch from a bzr branch."""
        check_update = True
        for url in cls.candidate_urls(bzr_branch):
            url = cls.tweak_url(url, launchpad)
            if not cls.plausible_launchpad_url(url):
                continue
            lp_branch = launchpad.branches.getByUrl(url=url)
            if lp_branch is not None:
                break
        else:
            if not create_missing:
                raise NoLaunchpadBranch(bzr_branch)
            lp_branch = cls.create_now(launchpad, bzr_branch)
            check_update = False
        return cls(lp_branch, bzr_branch.base, bzr_branch, check_update)

    @classmethod
    def create_now(cls, launchpad, bzr_branch):
        """Create a Bazaar branch on Launchpad for the supplied branch."""
        url = cls.tweak_url(bzr_branch.get_push_location(), launchpad)
        if not cls.plausible_launchpad_url(url):
            raise errors.BzrError(gettext('%s is not registered on Launchpad') %
                                  bzr_branch.base)
        bzr_branch.create_clone_on_transport(transport.get_transport(url))
        lp_branch = launchpad.branches.getByUrl(url=url)
        if lp_branch is None:
            raise errors.BzrError(gettext('%s is not registered on Launchpad') %
                                                                            url)
        return lp_branch

    def get_target(self):
        """Return the 'LaunchpadBranch' for the target of this one."""
        lp_branch = self.lp
        if lp_branch.project is not None:
            dev_focus = lp_branch.project.development_focus
            if dev_focus is None:
                raise errors.BzrError(gettext('%s has no development focus.') %
                                  lp_branch.bzr_identity)
            target = dev_focus.branch
            if target is None:
                raise errors.BzrError(gettext(
                        'development focus %s has no branch.') % dev_focus)
        elif lp_branch.sourcepackage is not None:
            target = lp_branch.sourcepackage.getBranch(pocket="Release")
            if target is None:
                raise errors.BzrError(gettext(
                                      'source package %s has no branch.') %
                                      lp_branch.sourcepackage)
        else:
            raise errors.BzrError(gettext(
                        '%s has no associated product or source package.') %
                                  lp_branch.bzr_identity)
        return LaunchpadBranch(target, target.bzr_identity)

    def update_lp(self):
        """Update the Launchpad copy of this branch."""
        if not self._check_update:
            return
        self.bzr.lock_read()
        try:
            if self.lp.last_scanned_id is not None:
                if self.bzr.last_revision() == self.lp.last_scanned_id:
                    trace.note(gettext('%s is already up-to-date.') %
                               self.lp.bzr_identity)
                    return
                graph = self.bzr.repository.get_graph()
                if not graph.is_ancestor(self.lp.last_scanned_id,
                                         self.bzr.last_revision()):
                    raise errors.DivergedBranches(self.bzr, self.push_bzr)
                trace.note(gettext('Pushing to %s') % self.lp.bzr_identity)
            self.bzr.push(self.push_bzr)
        finally:
            self.bzr.unlock()

    def find_lca_tree(self, other):
        """Find the revision tree for the LCA of this branch and other.

        :param other: Another LaunchpadBranch
        :return: The RevisionTree of the LCA of this branch and other.
        """
        graph = self.bzr.repository.get_graph(other.bzr.repository)
        lca = graph.find_unique_lca(self.bzr.last_revision(),
                                    other.bzr.last_revision())
        return self.bzr.repository.revision_tree(lca)


def canonical_url(object):
    """Return the canonical URL for a branch."""
    scheme, netloc, path, params, query, fragment = urlparse.urlparse(
        str(object.self_link))
    path = '/'.join(path.split('/')[2:])
    netloc = netloc.replace('api.', 'code.')
    return urlparse.urlunparse((scheme, netloc, path, params, query,
                                fragment))