summaryrefslogtreecommitdiff
path: root/fastimport/commands.py
blob: 9cd72ee98826dc10965adf9d1b7ec7ddfd6d2f7e (plain)
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
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
# Copyright (C) 2008 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, see <http://www.gnu.org/licenses/>.

"""fast-import command classes.

These objects are used by the parser to represent the content of
a fast-import stream.
"""
from __future__ import division

import re
import stat
import sys

from .helpers import (
    newobject as object,
    utf8_bytes_string,
    repr_bytes,
    )


# There is a bug in git 1.5.4.3 and older by which unquoting a string consumes
# one extra character. Set this variable to True to work-around it. It only
# happens when renaming a file whose name contains spaces and/or quotes, and
# the symptom is:
#   % git-fast-import
#   fatal: Missing space after source: R "file 1.txt" file 2.txt
# http://git.kernel.org/?p=git/git.git;a=commit;h=c8744d6a8b27115503565041566d97c21e722584
GIT_FAST_IMPORT_NEEDS_EXTRA_SPACE_AFTER_QUOTE = False


# Lists of command names
COMMAND_NAMES = [b'blob', b'checkpoint', b'commit', b'feature', b'progress',
                 b'reset', b'tag']
FILE_COMMAND_NAMES = [b'filemodify', b'filedelete', b'filecopy', b'filerename',
                      b'filedeleteall']

# Feature names
MULTIPLE_AUTHORS_FEATURE = b'multiple-authors'
COMMIT_PROPERTIES_FEATURE = b'commit-properties'
EMPTY_DIRS_FEATURE = b'empty-directories'
FEATURE_NAMES = [
    MULTIPLE_AUTHORS_FEATURE,
    COMMIT_PROPERTIES_FEATURE,
    EMPTY_DIRS_FEATURE,
    ]


class ImportCommand(object):
    """Base class for import commands."""

    def __init__(self, name):
        self.name = name
        # List of field names not to display
        self._binary = []

    def __str__(self):
        return repr(self)

    def __repr__(self):
        return bytes(self).decode('utf8')

    def __bytes__(self):
        raise NotImplementedError(
            'An implementation of __bytes__ is required'
        )

    def dump_str(self, names=None, child_lists=None, verbose=False):
        """Dump fields as a string.

        For debugging.

        :param names: the list of fields to include or
            None for all public fields
        :param child_lists: dictionary of child command names to
            fields for that child command to include
        :param verbose: if True, prefix each line with the command class and
            display fields as a dictionary; if False, dump just the field
            values with tabs between them
        """
        interesting = {}
        if names is None:
            fields = [
                k for k in list(self.__dict__.keys())
                if not k.startswith(b'_')
            ]
        else:
            fields = names
        for field in fields:
            value = self.__dict__.get(field)
            if field in self._binary and value is not None:
                value = b'(...)'
            interesting[field] = value
        if verbose:
            return "%s: %s" % (self.__class__.__name__, interesting)
        else:
            return "\t".join([repr(interesting[k]) for k in fields])


class BlobCommand(ImportCommand):

    def __init__(self, mark, data, lineno=0):
        ImportCommand.__init__(self, b'blob')
        self.mark = mark
        self.data = data
        self.lineno = lineno
        # Provide a unique id in case the mark is missing
        if mark is None:
            self.id = b'@' + ("%d" % lineno).encode('utf-8')
        else:
            self.id = b':' + mark
        self._binary = [b'data']

    def __bytes__(self):
        if self.mark is None:
            mark_line = b''
        else:
            mark_line = b"\nmark :" + self.mark
        return (b'blob' + mark_line + b'\n' +
                ('data %d\n' % len(self.data)).encode('utf-8') + self.data)


class CheckpointCommand(ImportCommand):

    def __init__(self):
        ImportCommand.__init__(self, b'checkpoint')

    def __bytes__(self):
        return b'checkpoint'


class CommitCommand(ImportCommand):

    def __init__(self, ref, mark, author, committer, message, from_,
                 merges, file_iter, lineno=0, more_authors=None,
                 properties=None):
        ImportCommand.__init__(self, b'commit')
        self.ref = ref
        self.mark = mark
        self.author = author
        self.committer = committer
        self.message = message
        self.from_ = from_
        self.merges = merges
        self.file_iter = file_iter
        self.more_authors = more_authors
        self.properties = properties
        self.lineno = lineno
        self._binary = [b'file_iter']
        # Provide a unique id in case the mark is missing
        if self.mark is None:
            self.id = b'@' + ('%d' % lineno).encode('utf-8')
        else:
            if isinstance(self.mark, (int)):
                self.id = b':' + str(self.mark).encode('utf-8')
            else:
                self.id = b':' + self.mark

    def copy(self, **kwargs):
        if not isinstance(self.file_iter, list):
            self.file_iter = list(self.file_iter)

        fields = dict(
            (key, value)
            for key, value in self.__dict__.items()
            if key not in ('id', 'name')
            if not key.startswith('_')
        )

        fields.update(kwargs)

        return CommitCommand(**fields)

    def __bytes__(self):
        return self.to_string(include_file_contents=True)

    def to_string(self, use_features=True, include_file_contents=False):
        """
            @todo the name to_string is ambiguous since the method actually
                returns bytes.
        """
        if self.mark is None:
            mark_line = b''
        else:
            if isinstance(self.mark, (int)):
                mark_line = b'\nmark :' + str(self.mark).encode('utf-8')
            else:
                mark_line = b'\nmark :' + self.mark

        if self.author is None:
            author_section = b''
        else:
            author_section = b'\nauthor ' + format_who_when(self.author)
            if use_features and self.more_authors:
                for author in self.more_authors:
                    author_section += b'\nauthor ' + format_who_when(author)

        committer = b'committer ' + format_who_when(self.committer)

        if self.message is None:
            msg_section = b''
        else:
            msg = self.message
            msg_section = ('\ndata %d\n' % len(msg)).encode('ascii') + msg
        if self.from_ is None:
            from_line = b''
        else:
            from_line = b'\nfrom ' + self.from_
        if self.merges is None:
            merge_lines = b''
        else:
            merge_lines = b''.join(
                [b'\nmerge ' + m for m in self.merges])
        if use_features and self.properties:
            property_lines = []
            for name in sorted(self.properties):
                value = self.properties[name]
                property_lines.append(b'\n' + format_property(name, value))
            properties_section = b''.join(property_lines)
        else:
            properties_section = b''
        if self.file_iter is None:
            filecommands = b''
        else:
            if include_file_contents:
                filecommands = b''.join(
                    [b'\n' + repr_bytes(c) for c in self.iter_files()])
            else:
                filecommands = b''.join(
                    [b'\n' + str(c) for c in self.iter_files()])
        return b''.join([
            b'commit ',
            self.ref,
            mark_line,
            author_section + b'\n',
            committer,
            msg_section,
            from_line,
            merge_lines,
            properties_section,
            filecommands])

    def dump_str(self, names=None, child_lists=None, verbose=False):
        result = [ImportCommand.dump_str(self, names, verbose=verbose)]
        for f in self.iter_files():
            if child_lists is None:
                continue
            try:
                child_names = child_lists[f.name]
            except KeyError:
                continue
            result.append('\t%s' % f.dump_str(child_names, verbose=verbose))
        return '\n'.join(result)

    def iter_files(self):
        """Iterate over files."""
        # file_iter may be a callable or an iterator
        if callable(self.file_iter):
            return self.file_iter()
        return iter(self.file_iter)


class FeatureCommand(ImportCommand):

    def __init__(self, feature_name, value=None, lineno=0):
        ImportCommand.__init__(self, b'feature')
        self.feature_name = feature_name
        self.value = value
        self.lineno = lineno

    def __bytes__(self):
        if self.value is None:
            value_text = b''
        else:
            value_text = b'=' + self.value
        return b'feature ' + self.feature_name + value_text


class ProgressCommand(ImportCommand):

    def __init__(self, message):
        ImportCommand.__init__(self, b'progress')
        self.message = message

    def __bytes__(self):
        return b'progress ' + self.message


class ResetCommand(ImportCommand):

    def __init__(self, ref, from_):
        ImportCommand.__init__(self, b'reset')
        self.ref = ref
        self.from_ = from_

    def __bytes__(self):
        if self.from_ is None:
            from_line = b''
        else:
            # According to git-fast-import(1), the extra LF is optional here;
            # however, versions of git up to 1.5.4.3 had a bug by which the LF
            # was needed. Always emit it, since it doesn't hurt and maintains
            # compatibility with older versions.
            # http://git.kernel.org/?p=git/git.git;a=commit;h=655e8515f279c01f525745d443f509f97cd805ab
            from_line = b'\nfrom ' + self.from_ + b'\n'
        return b'reset ' + self.ref + from_line


class TagCommand(ImportCommand):

    def __init__(self, id, from_, tagger, message):
        ImportCommand.__init__(self, b'tag')
        self.id = id
        self.from_ = from_
        self.tagger = tagger
        self.message = message

    def __bytes__(self):
        if self.from_ is None:
            from_line = b''
        else:
            from_line = b'\nfrom ' + self.from_
        if self.tagger is None:
            tagger_line = b''
        else:
            tagger_line = b'\ntagger ' + format_who_when(self.tagger)
        if self.message is None:
            msg_section = b''
        else:
            msg = self.message
            msg_section = ('\ndata %d\n' % len(msg)).encode('ascii') + msg
        return b'tag ' + self.id + from_line + tagger_line + msg_section


class FileCommand(ImportCommand):
    """Base class for file commands."""
    pass


class FileModifyCommand(FileCommand):

    def __init__(self, path, mode, dataref, data):
        # Either dataref or data should be null
        FileCommand.__init__(self, b'filemodify')
        self.path = check_path(path)
        self.mode = mode
        self.dataref = dataref
        self.data = data
        self._binary = [b'data']

    def __bytes__(self):
        return self.to_string(include_file_contents=True)

    def __str__(self):
        return self.to_string(include_file_contents=False)

    def _format_mode(self, mode):
        if mode in (0o755, 0o100755):
            return b'755'
        elif mode in (0o644, 0o100644):
            return b'644'
        elif mode == 0o40000:
            return b'040000'
        elif mode == 0o120000:
            return b'120000'
        elif mode == 0o160000:
            return b'160000'
        else:
            raise AssertionError('Unknown mode %o' % mode)

    def to_string(self, include_file_contents=False):
        datastr = b''
        if stat.S_ISDIR(self.mode):
            dataref = b'-'
        elif self.dataref is None:
            dataref = b'inline'
            if include_file_contents:
                datastr = (
                    ('\ndata %d\n' % len(self.data)).encode('ascii') +
                    self.data)
        else:
            dataref = self.dataref
        path = format_path(self.path)

        return b' '.join(
            [b'M', self._format_mode(self.mode), dataref, path + datastr])


class FileDeleteCommand(FileCommand):

    def __init__(self, path):
        FileCommand.__init__(self, b'filedelete')
        self.path = check_path(path)

    def __bytes__(self):
        return b' '.join([b'D', format_path(self.path)])


class FileCopyCommand(FileCommand):

    def __init__(self, src_path, dest_path):
        FileCommand.__init__(self, b'filecopy')
        self.src_path = check_path(src_path)
        self.dest_path = check_path(dest_path)

    def __bytes__(self):
        return b' '.join(
            [b'C', format_path(self.src_path, quote_spaces=True),
             format_path(self.dest_path)])


class FileRenameCommand(FileCommand):

    def __init__(self, old_path, new_path):
        FileCommand.__init__(self, b'filerename')
        self.old_path = check_path(old_path)
        self.new_path = check_path(new_path)

    def __bytes__(self):
        return b' '.join([
            b'R',
            format_path(self.old_path, quote_spaces=True),
            format_path(self.new_path)]
        )


class FileDeleteAllCommand(FileCommand):

    def __init__(self):
        FileCommand.__init__(self, b'filedeleteall')

    def __bytes__(self):
        return b'deleteall'


class NoteModifyCommand(FileCommand):

    def __init__(self, from_, data):
        super(NoteModifyCommand, self).__init__(b'notemodify')
        self.from_ = from_
        self.data = data
        self._binary = ['data']

    def __bytes__(self):
        return (b'N inline :' + self.from_ +
                ('\ndata %d\n' % len(self.data)).encode('ascii') + self.data)


def check_path(path):
    """Check that a path is legal.

    :return: the path if all is OK
    :raise ValueError: if the path is illegal
    """
    if path is None or path == b'' or path.startswith(b'/'):
        raise ValueError("illegal path '%s'" % path)

    if not isinstance(path, bytes):
        raise TypeError("illegal type for path '%r'" % path)

    return path


def format_path(p, quote_spaces=False):
    """Format a path in utf8, quoting it if necessary."""
    if b'\n' in p:
        p = re.sub(b'\n', b'\\n', p)
        quote = True
    else:
        quote = p[0] == b'"' or (quote_spaces and b' ' in p)
    if quote:
        extra = GIT_FAST_IMPORT_NEEDS_EXTRA_SPACE_AFTER_QUOTE and b' ' or b''
        p = b'"' + p + b'"' + extra
    return p


def format_who_when(fields):
    """Format tuple of name,email,secs-since-epoch,utc-offset-secs as bytes."""
    offset = fields[3]
    if offset < 0:
        offset_sign = b'-'
        offset = abs(offset)
    else:
        offset_sign = b'+'
    offset_hours = offset // 3600
    offset_minutes = offset // 60 - offset_hours * 60
    offset_str = (
        offset_sign +
        ('%02d%02d' % (offset_hours, offset_minutes)).encode('ascii'))
    name = fields[0]

    if name == b'':
        sep = b''
    else:
        sep = b' '

    name = utf8_bytes_string(name)

    email = fields[1]

    email = utf8_bytes_string(email)

    return b''.join(
        (name, sep, b'<', email, b'> ',
         ("%d" % fields[2]).encode('ascii'), b' ', offset_str))


def format_property(name, value):
    """Format the name and value (both unicode) of a property as a string."""
    result = b''
    utf8_name = utf8_bytes_string(name)

    result = b'property ' + utf8_name
    if value is not None:
        utf8_value = utf8_bytes_string(value)
        result += (b' ' + ('%d' % len(utf8_value)).encode('ascii') +
                   b' ' + utf8_value)

    return result