aboutsummaryrefslogtreecommitdiffstats
path: root/libbe/storage/vcs/git.py
blob: 851af19a4983a8717ff0edd2cf47e38ba68d1f99 (plain) (blame)
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
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
# Copyright (C) 2008-2012 Ben Finney <benf@cybersource.com.au>
#                         Chris Ball <cjb@laptop.org>
#                         Gianluca Montecchi <gian@grys.it>
#                         Robert Lehmann <mail@robertlehmann.de>
#                         W. Trevor King <wking@tremily.us>
#
# This file is part of Bugs Everywhere.
#
# Bugs Everywhere 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.
#
# Bugs Everywhere 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
# Bugs Everywhere.  If not, see <http://www.gnu.org/licenses/>.

"""Git_ backend.

.. _Git: http://git-scm.com/
"""

import os
import os.path
import re
import shutil
import unittest

try:
    import pygit2 as _pygit2
except ImportError, error:
    _pygit2 = None
    _pygit2_import_error = error
else:
    if getattr(_pygit2, '__version__', '0.17.3') == '0.17.3':
        _pygit2 = None
        _pygit2_import_error = NotImplementedError(
            'pygit2 <= 0.17.3 not supported')

import libbe
from ...ui.util import user as _user
from ...util import encoding as _encoding
from ..base import EmptyCommit as _EmptyCommit
from . import base

if libbe.TESTING == True:
    import doctest
    import sys


def new():
    if _pygit2:
        return PygitGit()
    else:
        return ExecGit()


class PygitGit(base.VCS):
    """:py:class:`base.VCS` implementation for Git.

    Using :py:mod:`pygit2` for the Git activity.
    """
    name='pygit2'
    _null_hex = u'0' * 40

    def __init__(self, *args, **kwargs):
        base.VCS.__init__(self, *args, **kwargs)
        self.versioned = True
        self._pygit_repository = None

    def __getstate__(self):
        """`pygit2.Repository`\s don't seem to pickle well.
        """
        attrs = dict(self.__dict__)
        if self._pygit_repository is not None:
            attrs['_pygit_repository'] = self._pygit_repository.path
        return attrs

    def __setstate__(self, state):
        """`pygit2.Repository`\s don't seem to pickle well.
        """
        self.__dict__.update(state)
        if self._pygit_repository is not None:
            gitdir = self._pygit_repository
            self._pygit_repository = _pygit2.Repository(gitdir)

    def _vcs_version(self):
        if _pygit2:
            return getattr(_pygit2, '__verison__', '?')
        return None

    def _vcs_get_user_id(self):
        try:
            name = self._pygit_repository.config['user.name']
        except KeyError:
            name = ''
        try:
            email = self._pygit_repository.config['user.email']
        except KeyError:
            email = ''
        if name != '' or email != '': # got something!
            # guess missing info, if necessary
            if name == '':
                name = _user.get_fallback_fullname()
            if email == '':
                email = _user.get_fallback_email()
            if '@' not in email:
                raise ValueError((name, email))
            return _user.create_user_id(name, email)
        return None # Git has no infomation

    def _vcs_detect(self, path):
        try:
            _pygit2.discover_repository(path)
        except KeyError:
            return False
        return True

    def _vcs_root(self, path):
        """Find the root of the deepest repository containing path."""
        # Assume that nothing funny is going on; in particular, that we aren't
        # dealing with a bare repo.
        gitdir = _pygit2.discover_repository(path)
        self._pygit_repository = _pygit2.Repository(gitdir)
        dirname,tip = os.path.split(gitdir)
        if tip == '':  # split('x/y/z/.git/') == ('x/y/z/.git', '')
            dirname,tip = os.path.split(dirname)
        assert tip == '.git', tip
        return dirname

    def _vcs_init(self, path):
        bare = False
        self._pygit_repository = _pygit2.init_repository(path, bare)

    def _vcs_destroy(self):
        vcs_dir = os.path.join(self.repo, '.git')
        if os.path.exists(vcs_dir):
            shutil.rmtree(vcs_dir)

    def _vcs_add(self, path):
        abspath = self._u_abspath(path)
        if os.path.isdir(abspath):
            return
        self._pygit_repository.index.read()
        self._pygit_repository.index.add(path)
        self._pygit_repository.index.write()

    def _vcs_remove(self, path):
        abspath = self._u_abspath(path)
        if not os.path.isdir(self._u_abspath(abspath)):
            self._pygit_repository.index.read()
            del self._pygit_repository.index[path]
            self._pygit_repository.index.write()
            os.remove(os.path.join(self.repo, path))

    def _vcs_update(self, path):
        self._vcs_add(path)

    def _git_get_commit(self, revision):
        if isinstance(revision, str):
            revision = unicode(revision, 'ascii')
        commit = self._pygit_repository.revparse_single(revision)
        assert commit.type == _pygit2.GIT_OBJ_COMMIT, commit
        return commit

    def _git_get_object(self, path, revision):
        commit = self._git_get_commit(revision=revision)
        tree = commit.tree
        sections = path.split(os.path.sep)
        for section in sections[:-1]:  # traverse trees
            child_tree = None
            for entry in tree:
                if entry.name == section:
                    eobj = entry.to_object()
                    if eobj.type == _pygit2.GIT_OBJ_TREE:
                        child_tree = eobj
                        break
                    else:
                        raise ValueError(path)  # not a directory
            if child_tree is None:
                raise ValueError((path, sections, section, [e.name for e in tree]))
            tree = child_tree
        eobj = None
        for entry in tree:
            if entry.name == sections[-1]:
                eobj = entry.to_object()
        return eobj

    def _vcs_get_file_contents(self, path, revision=None):
        if revision == None:
            return base.VCS._vcs_get_file_contents(self, path, revision)
        else:
            blob = self._git_get_object(path=path, revision=revision)
            if blob.type != _pygit2.GIT_OBJ_BLOB:
                raise ValueError(path)  # not a file
            return blob.read_raw()

    def _vcs_path(self, id, revision):
        return self._u_find_id(id, revision)

    def _vcs_isdir(self, path, revision):
        obj = self._git_get_object(path=path, revision=revision)
        return obj.type == _pygit2.GIT_OBJ_TREE

    def _vcs_listdir(self, path, revision):
        tree = self._git_get_object(path=path, revision=revision)
        assert tree.type == _pygit2.GIT_OBJ_TREE, tree
        return [e.name for e in tree]

    def _vcs_commit(self, commitfile, allow_empty=False):
        self._pygit_repository.index.read()
        tree_oid = self._pygit_repository.index.write_tree()
        try:
            self._pygit_repository.head
        except _pygit2.GitError:  # no head; this is the first commit
            parents = []
            tree = self._pygit_repository[tree_oid]
            if not allow_empty and len(tree) == 0:
                raise _EmptyCommit()
        else:
            parents = [self._pygit_repository.head.oid]
            if (not allow_empty and
                tree_oid == self._pygit_repository.head.tree.oid):
                raise _EmptyCommit()
        update_ref = 'HEAD'
        user_id = self.get_user_id()
        name,email = _user.parse_user_id(user_id)
        # using default times is recent, see
        #   https://github.com/libgit2/pygit2/pull/129
        author = _pygit2.Signature(name, email)
        committer = author
        message = _encoding.get_file_contents(commitfile, decode=False)
        encoding = _encoding.get_text_file_encoding()
        commit_oid = self._pygit_repository.create_commit(
            update_ref, author, committer, message, tree_oid, parents,
            encoding)
        commit = self._pygit_repository[commit_oid]
        return commit.hex

    def _vcs_revision_id(self, index):
        walker = self._pygit_repository.walk(
            self._pygit_repository.head.oid, _pygit2.GIT_SORT_TIME)
        if index < 0:
            target_i = -1 - index  # -1: 0, -2: 1, ...
            for i,commit in enumerate(walker):
                if i == target_i:
                    return commit.hex
        elif index > 0:
            revisions = [commit.hex for commit in walker]
            # revisions is [newest, older, ..., oldest]
            if index > len(revisions):
                return None
            return revisions[len(revisions) - index]
        else:
            raise NotImplementedError('initial revision')
        return None

    def _vcs_changed(self, revision):
        commit = self._git_get_commit(revision=revision)
        diff = commit.tree.diff(self._pygit_repository.head.tree)
        new = set()
        modified = set()
        removed = set()
        for hunk in diff.changes['hunks']:
            if hunk.old_oid == self._null_hex:  # pygit2 uses hex in hunk.*_oid
                new.add(hunk.new_file)
            elif hunk.new_oid == self._null_hex:
                removed.add(hunk.old_file)
            else:
                modified.add(hunk.new_file)
        return (list(new), list(modified), list(removed))


class ExecGit (PygitGit):
    """:py:class:`base.VCS` implementation for Git.
    """
    name='git'
    client='git'

    def _vcs_version(self):
        try:
            status,output,error = self._u_invoke_client('--version')
        except base.CommandError:  # command not found?
            return None
        return output.strip()

    def _vcs_get_user_id(self):
        status,output,error = self._u_invoke_client(
            'config', 'user.name', expect=(0,1))
        if status == 0:
            name = output.rstrip('\n')
        else:
            name = ''
        status,output,error = self._u_invoke_client(
            'config', 'user.email', expect=(0,1))
        if status == 0:
            email = output.rstrip('\n')
        else:
            email = ''
        if name != '' or email != '': # got something!
            # guess missing info, if necessary
            if name == '':
                name = _user.get_fallback_fullname()
            if email == '':
                email = _user.get_fallback_email()
            return _user.create_user_id(name, email)
        return None # Git has no infomation

    def _vcs_detect(self, path):
        if self._u_search_parent_directories(path, '.git') != None :
            return True
        return False

    def _vcs_root(self, path):
        """Find the root of the deepest repository containing path."""
        # Assume that nothing funny is going on; in particular, that we aren't
        # dealing with a bare repo.
        if os.path.isdir(path) != True:
            path = os.path.dirname(path)
        status,output,error = self._u_invoke_client('rev-parse', '--git-dir',
                                                    cwd=path)
        gitdir = os.path.join(path, output.rstrip('\n'))
        dirname = os.path.abspath(os.path.dirname(gitdir))
        return dirname

    def _vcs_init(self, path):
        self._u_invoke_client('init', cwd=path)

    def _vcs_add(self, path):
        if os.path.isdir(path):
            return
        self._u_invoke_client('add', path)

    def _vcs_remove(self, path):
        if not os.path.isdir(self._u_abspath(path)):
            self._u_invoke_client('rm', '-f', path)
    def _vcs_get_file_contents(self, path, revision=None):
        if revision == None:
            return base.VCS._vcs_get_file_contents(self, path, revision)
        else:
            arg = '%s:%s' % (revision,path)
            status,output,error = self._u_invoke_client('show', arg)
            return output

    def _vcs_isdir(self, path, revision):
        arg = '%s:%s' % (revision,path)
        args = ['ls-tree', arg]
        kwargs = {'expect':(0,128)}
        status,output,error = self._u_invoke_client(*args, **kwargs)
        if status != 0:
            if 'not a tree object' in error:
                return False
            raise base.CommandError(args, status, stderr=error)
        return True

    def _vcs_listdir(self, path, revision):
        arg = '%s:%s' % (revision,path)
        status,output,error = self._u_invoke_client(
            'ls-tree', '--name-only', arg)
        return output.rstrip('\n').splitlines()

    def _vcs_commit(self, commitfile, allow_empty=False):
        args = ['commit', '--file', commitfile]
        if allow_empty == True:
            args.append('--allow-empty')
            status,output,error = self._u_invoke_client(*args)
        else:
            kwargs = {'expect':(0,1)}
            status,output,error = self._u_invoke_client(*args, **kwargs)
            strings = ['nothing to commit',
                       'nothing added to commit']
            if self._u_any_in_string(strings, output) == True:
                raise base.EmptyCommit()
        full_revision = self._vcs_revision_id(-1)
        assert full_revision[:7] in output, \
            'Mismatched revisions:\n%s\n%s' % (full_revision, output)
        return full_revision

    def _vcs_revision_id(self, index):
        args = ['rev-list', '--first-parent', '--reverse', 'HEAD']
        kwargs = {'expect':(0,128)}
        status,output,error = self._u_invoke_client(*args, **kwargs)
        if status == 128:
            if error.startswith("fatal: ambiguous argument 'HEAD': unknown "):
                return None
            raise base.CommandError(args, status, stderr=error)
        revisions = output.splitlines()
        try:
            if index > 0:
                return revisions[index-1]
            elif index < 0:
                return revisions[index]
            else:
                return None
        except IndexError:
            return None

    def _diff(self, revision):
        status,output,error = self._u_invoke_client('diff', revision)
        return output

    def _parse_diff(self, diff_text):
        """_parse_diff(diff_text) -> (new,modified,removed)

        `new`, `modified`, and `removed` are lists of files.

        Example diff text::

          diff --git a/dir/changed b/dir/changed
          index 6c3ea8c..2f2f7c7 100644
          --- a/dir/changed
          +++ b/dir/changed
          @@ -1,3 +1,3 @@
           hi
          -there
          +everyone and
           joe
          diff --git a/dir/deleted b/dir/deleted
          deleted file mode 100644
          index 225ec04..0000000
          --- a/dir/deleted
          +++ /dev/null
          @@ -1,3 +0,0 @@
          -in
          -the
          -beginning
          diff --git a/dir/moved b/dir/moved
          deleted file mode 100644
          index 5ef102f..0000000
          --- a/dir/moved
          +++ /dev/null
          @@ -1,4 +0,0 @@
          -the
          -ants
          -go
          -marching
          diff --git a/dir/moved2 b/dir/moved2
          new file mode 100644
          index 0000000..5ef102f
          --- /dev/null
          +++ b/dir/moved2
          @@ -0,0 +1,4 @@
          +the
          +ants
          +go
          +marching
          diff --git a/dir/new b/dir/new
          new file mode 100644
          index 0000000..94954ab
          --- /dev/null
          +++ b/dir/new
          @@ -0,0 +1,2 @@
          +hello
          +world
        """
        new = []
        modified = []
        removed = []
        lines = diff_text.splitlines()
        for i,line in enumerate(lines):
            if not line.startswith('diff '):
                continue
            file_a,file_b = line.split()[-2:]
            assert file_a.startswith('a/'), \
                'missformed file_a %s' % file_a
            assert file_b.startswith('b/'), \
                'missformed file_b %s' % file_b
            file = file_a[2:]
            assert file_b[2:] == file, \
                'diff file missmatch %s != %s' % (file_a, file_b)
            if lines[i+1].startswith('new '):
                new.append(file)
            elif lines[i+1].startswith('index '):
                modified.append(file)
            elif lines[i+1].startswith('deleted '):
                removed.append(file)
        return (new,modified,removed)

    def _vcs_changed(self, revision):
        return self._parse_diff(self._diff(revision))


if libbe.TESTING == True:
    base.make_vcs_testcase_subclasses(PygitGit, sys.modules[__name__])
    base.make_vcs_testcase_subclasses(ExecGit, sys.modules[__name__])

    unitsuite =unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])
    suite = unittest.TestSuite([unitsuite, doctest.DocTestSuite()])