summaryrefslogtreecommitdiff
path: root/contrib/remote-helpers/git-remote-bzr
blob: c3a3cac77b875b2cb925971e2baca141f9c4f163 (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
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
#!/usr/bin/env python
#
# Copyright (c) 2012 Felipe Contreras
#

#
# Just copy to your ~/bin, or anywhere in your $PATH.
# Then you can clone with:
# % git clone bzr::/path/to/bzr/repo/or/url
#
# For example:
# % git clone bzr::$HOME/myrepo
# or
# % git clone bzr::lp:myrepo
#
# If you want to specify which branches you want track (per repo):
# git config remote-bzr.branches 'trunk, devel, test'
#

import sys

import bzrlib
if hasattr(bzrlib, "initialize"):
    bzrlib.initialize()

import bzrlib.plugin
bzrlib.plugin.load_plugins()

import bzrlib.generate_ids
import bzrlib.transport
import bzrlib.errors
import bzrlib.ui
import bzrlib.urlutils
import bzrlib.branch

import sys
import os
import json
import re
import StringIO
import atexit, shutil, hashlib, urlparse, subprocess

NAME_RE = re.compile('^([^<>]+)')
AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
EMAIL_RE = re.compile('^([^<>]+[^ \\\t<>])?\\b(?:[ \\t<>]*?)\\b([^ \\t<>]+@[^ \\t<>]+)')
RAW_AUTHOR_RE = re.compile('^(\w+) (.+)? <(.*)> (\d+) ([+-]\d+)')

def die(msg, *args):
    sys.stderr.write('ERROR: %s\n' % (msg % args))
    sys.exit(1)

def warn(msg, *args):
    sys.stderr.write('WARNING: %s\n' % (msg % args))

def gittz(tz):
    return '%+03d%02d' % (tz / 3600, tz % 3600 / 60)

def get_config(config):
    cmd = ['git', 'config', '--get', config]
    process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
    output, _ = process.communicate()
    return output

class Marks:

    def __init__(self, path):
        self.path = path
        self.tips = {}
        self.marks = {}
        self.rev_marks = {}
        self.last_mark = 0
        self.load()

    def load(self):
        if not os.path.exists(self.path):
            return

        tmp = json.load(open(self.path))
        self.tips = tmp['tips']
        self.marks = tmp['marks']
        self.last_mark = tmp['last-mark']

        for rev, mark in self.marks.iteritems():
            self.rev_marks[mark] = rev

    def dict(self):
        return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }

    def store(self):
        json.dump(self.dict(), open(self.path, 'w'))

    def __str__(self):
        return str(self.dict())

    def from_rev(self, rev):
        return self.marks[rev]

    def to_rev(self, mark):
        return str(self.rev_marks[mark])

    def next_mark(self):
        self.last_mark += 1
        return self.last_mark

    def get_mark(self, rev):
        self.last_mark += 1
        self.marks[rev] = self.last_mark
        return self.last_mark

    def is_marked(self, rev):
        return rev in self.marks

    def new_mark(self, rev, mark):
        self.marks[rev] = mark
        self.rev_marks[mark] = rev
        self.last_mark = mark

    def get_tip(self, branch):
        try:
            return str(self.tips[branch])
        except KeyError:
            return None

    def set_tip(self, branch, tip):
        self.tips[branch] = tip

class Parser:

    def __init__(self, repo):
        self.repo = repo
        self.line = self.get_line()

    def get_line(self):
        return sys.stdin.readline().strip()

    def __getitem__(self, i):
        return self.line.split()[i]

    def check(self, word):
        return self.line.startswith(word)

    def each_block(self, separator):
        while self.line != separator:
            yield self.line
            self.line = self.get_line()

    def __iter__(self):
        return self.each_block('')

    def next(self):
        self.line = self.get_line()
        if self.line == 'done':
            self.line = None

    def get_mark(self):
        i = self.line.index(':') + 1
        return int(self.line[i:])

    def get_data(self):
        if not self.check('data'):
            return None
        i = self.line.index(' ') + 1
        size = int(self.line[i:])
        return sys.stdin.read(size)

    def get_author(self):
        m = RAW_AUTHOR_RE.match(self.line)
        if not m:
            return None
        _, name, email, date, tz = m.groups()
        committer = '%s <%s>' % (name, email)
        tz = int(tz)
        tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
        return (committer, int(date), tz)

def rev_to_mark(rev):
    global marks
    return marks.from_rev(rev)

def mark_to_rev(mark):
    global marks
    return marks.to_rev(mark)

def fixup_user(user):
    name = mail = None
    user = user.replace('"', '')
    m = AUTHOR_RE.match(user)
    if m:
        name = m.group(1)
        mail = m.group(2).strip()
    else:
        m = EMAIL_RE.match(user)
        if m:
            name = m.group(1)
            mail = m.group(2)
        else:
            m = NAME_RE.match(user)
            if m:
                name = m.group(1).strip()

    if not name:
        name = 'unknown'
    if not mail:
        mail = 'Unknown'

    return '%s <%s>' % (name, mail)

def get_filechanges(cur, prev):
    modified = {}
    removed = {}

    changes = cur.changes_from(prev)

    def u(s):
        return s.encode('utf-8')

    for path, fid, kind in changes.added:
        modified[u(path)] = fid
    for path, fid, kind in changes.removed:
        removed[u(path)] = None
    for path, fid, kind, mod, _ in changes.modified:
        modified[u(path)] = fid
    for oldpath, newpath, fid, kind, mod, _ in changes.renamed:
        removed[u(oldpath)] = None
        if kind == 'directory':
            lst = cur.list_files(from_dir=newpath, recursive=True)
            for path, file_class, kind, fid, entry in lst:
                if kind != 'directory':
                    modified[u(newpath + '/' + path)] = fid
        else:
            modified[u(newpath)] = fid

    return modified, removed

def export_files(tree, files):
    global marks, filenodes

    final = []
    for path, fid in files.iteritems():
        kind = tree.kind(fid)

        h = tree.get_file_sha1(fid)

        if kind == 'symlink':
            d = tree.get_symlink_target(fid)
            mode = '120000'
        elif kind == 'file':

            if tree.is_executable(fid):
                mode = '100755'
            else:
                mode = '100644'

            # is the blob already exported?
            if h in filenodes:
                mark = filenodes[h]
                final.append((mode, mark, path))
                continue

            d = tree.get_file_text(fid)
        elif kind == 'directory':
            continue
        else:
            die("Unhandled kind '%s' for path '%s'" % (kind, path))

        mark = marks.next_mark()
        filenodes[h] = mark

        print "blob"
        print "mark :%u" % mark
        print "data %d" % len(d)
        print d

        final.append((mode, mark, path))

    return final

def export_branch(repo, name):
    global prefix

    ref = '%s/heads/%s' % (prefix, name)
    tip = marks.get_tip(name)

    branch = get_remote_branch(name)
    repo = branch.repository

    branch.lock_read()
    revs = branch.iter_merge_sorted_revisions(None, tip, 'exclude', 'forward')
    try:
        tip_revno = branch.revision_id_to_revno(tip)
        last_revno, _ = branch.last_revision_info()
        total = last_revno - tip_revno
    except bzrlib.errors.NoSuchRevision:
        tip_revno = 0
        total = 0

    for revid, _, seq, _ in revs:

        if marks.is_marked(revid):
            continue

        rev = repo.get_revision(revid)
        revno = seq[0]

        parents = rev.parent_ids
        time = rev.timestamp
        tz = rev.timezone
        committer = rev.committer.encode('utf-8')
        committer = "%s %u %s" % (fixup_user(committer), time, gittz(tz))
        authors = rev.get_apparent_authors()
        if authors:
            author = authors[0].encode('utf-8')
            author = "%s %u %s" % (fixup_user(author), time, gittz(tz))
        else:
            author = committer
        msg = rev.message.encode('utf-8')

        msg += '\n'

        if len(parents) == 0:
            parent = bzrlib.revision.NULL_REVISION
        else:
            parent = parents[0]

        cur_tree = repo.revision_tree(revid)
        prev = repo.revision_tree(parent)
        modified, removed = get_filechanges(cur_tree, prev)

        modified_final = export_files(cur_tree, modified)

        if len(parents) == 0:
            print 'reset %s' % ref

        print "commit %s" % ref
        print "mark :%d" % (marks.get_mark(revid))
        print "author %s" % (author)
        print "committer %s" % (committer)
        print "data %d" % (len(msg))
        print msg

        for i, p in enumerate(parents):
            try:
                m = rev_to_mark(p)
            except KeyError:
                # ghost?
                continue
            if i == 0:
                print "from :%s" % m
            else:
                print "merge :%s" % m

        for f in removed:
            print "D %s" % (f,)
        for f in modified_final:
            print "M %s :%u %s" % f
        print

        if len(seq) > 1:
            # let's skip branch revisions from the progress report
            continue

        progress = (revno - tip_revno)
        if (progress % 100 == 0):
            if total:
                print "progress revision %d '%s' (%d/%d)" % (revno, name, progress, total)
            else:
                print "progress revision %d '%s' (%d)" % (revno, name, progress)

    branch.unlock()

    revid = branch.last_revision()

    # make sure the ref is updated
    print "reset %s" % ref
    print "from :%u" % rev_to_mark(revid)
    print

    marks.set_tip(name, revid)

def export_tag(repo, name):
    global tags, prefix

    ref = '%s/tags/%s' % (prefix, name)
    print "reset %s" % ref
    print "from :%u" % rev_to_mark(tags[name])
    print

def do_import(parser):
    global dirname

    repo = parser.repo
    path = os.path.join(dirname, 'marks-git')

    print "feature done"
    if os.path.exists(path):
        print "feature import-marks=%s" % path
    print "feature export-marks=%s" % path
    print "feature force"
    sys.stdout.flush()

    while parser.check('import'):
        ref = parser[1]
        if ref.startswith('refs/heads/'):
            name = ref[len('refs/heads/'):]
            export_branch(repo, name)
        if ref.startswith('refs/tags/'):
            name = ref[len('refs/tags/'):]
            export_tag(repo, name)
        parser.next()

    print 'done'

    sys.stdout.flush()

def parse_blob(parser):
    global blob_marks

    parser.next()
    mark = parser.get_mark()
    parser.next()
    data = parser.get_data()
    blob_marks[mark] = data
    parser.next()

class CustomTree():

    def __init__(self, branch, revid, parents, files):
        global files_cache

        self.updates = {}
        self.branch = branch

        def copy_tree(revid):
            files = files_cache[revid] = {}
            branch.lock_read()
            tree = branch.repository.revision_tree(revid)
            try:
                for path, entry in tree.iter_entries_by_dir():
                    files[path] = [entry.file_id, None]
            finally:
                branch.unlock()
            return files

        if len(parents) == 0:
            self.base_id = bzrlib.revision.NULL_REVISION
            self.base_files = {}
        else:
            self.base_id = parents[0]
            self.base_files = files_cache.get(self.base_id, None)
            if not self.base_files:
                self.base_files = copy_tree(self.base_id)

        self.files = files_cache[revid] = self.base_files.copy()
        self.rev_files = {}

        for path, data in self.files.iteritems():
            fid, mark = data
            self.rev_files[fid] = [path, mark]

        for path, f in files.iteritems():
            fid, mark = self.files.get(path, [None, None])
            if not fid:
                fid = bzrlib.generate_ids.gen_file_id(path)
            f['path'] = path
            self.rev_files[fid] = [path, mark]
            self.updates[fid] = f

    def last_revision(self):
        return self.base_id

    def iter_changes(self):
        changes = []

        def get_parent(dirname, basename):
            parent_fid, mark = self.base_files.get(dirname, [None, None])
            if parent_fid:
                return parent_fid
            parent_fid, mark = self.files.get(dirname, [None, None])
            if parent_fid:
                return parent_fid
            if basename == '':
                return None
            fid = bzrlib.generate_ids.gen_file_id(path)
            add_entry(fid, dirname, 'directory')
            return fid

        def add_entry(fid, path, kind, mode = None):
            dirname, basename = os.path.split(path)
            parent_fid = get_parent(dirname, basename)

            executable = False
            if mode == '100755':
                executable = True
            elif mode == '120000':
                kind = 'symlink'

            change = (fid,
                    (None, path),
                    True,
                    (False, True),
                    (None, parent_fid),
                    (None, basename),
                    (None, kind),
                    (None, executable))
            self.files[path] = [change[0], None]
            changes.append(change)

        def update_entry(fid, path, kind, mode = None):
            dirname, basename = os.path.split(path)
            parent_fid = get_parent(dirname, basename)

            executable = False
            if mode == '100755':
                executable = True
            elif mode == '120000':
                kind = 'symlink'

            change = (fid,
                    (path, path),
                    True,
                    (True, True),
                    (None, parent_fid),
                    (None, basename),
                    (None, kind),
                    (None, executable))
            self.files[path] = [change[0], None]
            changes.append(change)

        def remove_entry(fid, path, kind):
            dirname, basename = os.path.split(path)
            parent_fid = get_parent(dirname, basename)
            change = (fid,
                    (path, None),
                    True,
                    (True, False),
                    (parent_fid, None),
                    (None, None),
                    (None, None),
                    (None, None))
            del self.files[path]
            changes.append(change)

        for fid, f in self.updates.iteritems():
            path = f['path']

            if 'deleted' in f:
                remove_entry(fid, path, 'file')
                continue

            if path in self.base_files:
                update_entry(fid, path, 'file', f['mode'])
            else:
                add_entry(fid, path, 'file', f['mode'])

            self.files[path][1] = f['mark']
            self.rev_files[fid][1] = f['mark']

        return changes

    def get_content(self, file_id):
        path, mark = self.rev_files[file_id]
        if mark:
            return blob_marks[mark]

        # last resort
        tree = self.branch.repository.revision_tree(self.base_id)
        return tree.get_file_text(file_id)

    def get_file_with_stat(self, file_id, path=None):
        content = self.get_content(file_id)
        return (StringIO.StringIO(content), None)

    def get_symlink_target(self, file_id):
        return self.get_content(file_id)

    def id2path(self, file_id):
        path, mark = self.rev_files[file_id]
        return path

def c_style_unescape(string):
    if string[0] == string[-1] == '"':
        return string.decode('string-escape')[1:-1]
    return string

def parse_commit(parser):
    global marks, blob_marks, parsed_refs
    global mode

    parents = []

    ref = parser[1]
    parser.next()

    if ref.startswith('refs/heads/'):
        name = ref[len('refs/heads/'):]
        branch = get_remote_branch(name)
    else:
        die('unknown ref')

    commit_mark = parser.get_mark()
    parser.next()
    author = parser.get_author()
    parser.next()
    committer = parser.get_author()
    parser.next()
    data = parser.get_data()
    parser.next()
    if parser.check('from'):
        parents.append(parser.get_mark())
        parser.next()
    while parser.check('merge'):
        parents.append(parser.get_mark())
        parser.next()

    # fast-export adds an extra newline
    if data[-1] == '\n':
        data = data[:-1]

    files = {}

    for line in parser:
        if parser.check('M'):
            t, m, mark_ref, path = line.split(' ', 3)
            mark = int(mark_ref[1:])
            f = { 'mode' : m, 'mark' : mark }
        elif parser.check('D'):
            t, path = line.split(' ', 1)
            f = { 'deleted' : True }
        else:
            die('Unknown file command: %s' % line)
        path = c_style_unescape(path).decode('utf-8')
        files[path] = f

    committer, date, tz = committer
    parents = [mark_to_rev(p) for p in parents]
    revid = bzrlib.generate_ids.gen_revision_id(committer, date)
    props = {}
    props['branch-nick'] = branch.nick

    mtree = CustomTree(branch, revid, parents, files)
    changes = mtree.iter_changes()

    branch.lock_write()
    try:
        builder = branch.get_commit_builder(parents, None, date, tz, committer, props, revid)
        try:
            list(builder.record_iter_changes(mtree, mtree.last_revision(), changes))
            builder.finish_inventory()
            builder.commit(data.decode('utf-8', 'replace'))
        except Exception, e:
            builder.abort()
            raise
    finally:
        branch.unlock()

    parsed_refs[ref] = revid
    marks.new_mark(revid, commit_mark)

def parse_reset(parser):
    global parsed_refs

    ref = parser[1]
    parser.next()

    # ugh
    if parser.check('commit'):
        parse_commit(parser)
        return
    if not parser.check('from'):
        return
    from_mark = parser.get_mark()
    parser.next()

    parsed_refs[ref] = mark_to_rev(from_mark)

def do_export(parser):
    global parsed_refs, dirname

    parser.next()

    for line in parser.each_block('done'):
        if parser.check('blob'):
            parse_blob(parser)
        elif parser.check('commit'):
            parse_commit(parser)
        elif parser.check('reset'):
            parse_reset(parser)
        elif parser.check('tag'):
            pass
        elif parser.check('feature'):
            pass
        else:
            die('unhandled export command: %s' % line)

    for ref, revid in parsed_refs.iteritems():
        if ref.startswith('refs/heads/'):
            name = ref[len('refs/heads/'):]
            branch = get_remote_branch(name)
            branch.generate_revision_history(revid, marks.get_tip(name))

            if name in peers:
                peer = bzrlib.branch.Branch.open(peers[name])
                try:
                    peer.bzrdir.push_branch(branch, revision_id=revid)
                except bzrlib.errors.DivergedBranches:
                    print "error %s non-fast forward" % ref
                    continue

            try:
                wt = branch.bzrdir.open_workingtree()
                wt.update()
            except bzrlib.errors.NoWorkingTree:
                pass
        elif ref.startswith('refs/tags/'):
            # TODO: implement tag push
            print "error %s pushing tags not supported" % ref
            continue
        else:
            # transport-helper/fast-export bugs
            continue

        print "ok %s" % ref

    print

def do_capabilities(parser):
    global dirname

    print "import"
    print "export"
    print "refspec refs/heads/*:%s/heads/*" % prefix
    print "refspec refs/tags/*:%s/tags/*" % prefix

    path = os.path.join(dirname, 'marks-git')

    if os.path.exists(path):
        print "*import-marks %s" % path
    print "*export-marks %s" % path

    print

def ref_is_valid(name):
    return not True in [c in name for c in '~^: \\']

def do_list(parser):
    global tags

    master_branch = None

    for name in branches:
        if not master_branch:
            master_branch = name
        print "? refs/heads/%s" % name

    branch = get_remote_branch(master_branch)
    branch.lock_read()
    for tag, revid in branch.tags.get_tag_dict().items():
        try:
            branch.revision_id_to_dotted_revno(revid)
        except bzrlib.errors.NoSuchRevision:
            continue
        if not ref_is_valid(tag):
            continue
        print "? refs/tags/%s" % tag
        tags[tag] = revid
    branch.unlock()

    print "@refs/heads/%s HEAD" % master_branch
    print

def clone(path, remote_branch):
    try:
        bdir = bzrlib.bzrdir.BzrDir.create(path)
    except bzrlib.errors.AlreadyControlDirError:
        bdir = bzrlib.bzrdir.BzrDir.open(path)
    repo = bdir.find_repository()
    repo.fetch(remote_branch.repository)
    return remote_branch.sprout(bdir, repository=repo)

def get_remote_branch(name):
    global dirname, branches

    remote_branch = bzrlib.branch.Branch.open(branches[name])
    if isinstance(remote_branch.user_transport, bzrlib.transport.local.LocalTransport):
        return remote_branch

    branch_path = os.path.join(dirname, 'clone', name)

    try:
        branch = bzrlib.branch.Branch.open(branch_path)
    except bzrlib.errors.NotBranchError:
        # clone
        branch = clone(branch_path, remote_branch)
    else:
        # pull
        try:
            branch.pull(remote_branch, overwrite=True)
        except bzrlib.errors.DivergedBranches:
            # use remote branch for now
            return remote_branch

    return branch

def find_branches(repo):
    transport = repo.bzrdir.root_transport

    for fn in transport.iter_files_recursive():
        if not fn.endswith('.bzr/branch-format'):
            continue

        name = subdir = fn[:-len('/.bzr/branch-format')]
        name = name if name != '' else 'master'
        name = name.replace('/', '+')

        try:
            cur = transport.clone(subdir)
            branch = bzrlib.branch.Branch.open_from_transport(cur)
        except bzrlib.errors.NotBranchError:
            continue
        else:
            yield name, branch.base

def get_repo(url, alias):
    global dirname, peer, branches

    normal_url = bzrlib.urlutils.normalize_url(url)
    origin = bzrlib.bzrdir.BzrDir.open(url)
    is_local = isinstance(origin.transport, bzrlib.transport.local.LocalTransport)

    shared_path = os.path.join(gitdir, 'bzr')
    try:
        shared_dir = bzrlib.bzrdir.BzrDir.open(shared_path)
    except bzrlib.errors.NotBranchError:
        shared_dir = bzrlib.bzrdir.BzrDir.create(shared_path)
    try:
        shared_repo = shared_dir.open_repository()
    except bzrlib.errors.NoRepositoryPresent:
        shared_repo = shared_dir.create_repository(shared=True)

    if not is_local:
        clone_path = os.path.join(dirname, 'clone')
        if not os.path.exists(clone_path):
            os.mkdir(clone_path)
        else:
            # check and remove old organization
            try:
                bdir = bzrlib.bzrdir.BzrDir.open(clone_path)
                bdir.destroy_repository()
            except bzrlib.errors.NotBranchError:
                pass
            except bzrlib.errors.NoRepositoryPresent:
                pass

    wanted = get_config('remote-bzr.branches').rstrip().split(', ')
    # stupid python
    wanted = [e for e in wanted if e]

    if not wanted:
        try:
            repo = origin.open_repository()
            if not repo.user_transport.listable():
                # this repository is not usable for us
                raise bzrlib.errors.NoRepositoryPresent(repo.bzrdir)
        except bzrlib.errors.NoRepositoryPresent:
            wanted = ['master']

    if wanted:
        def list_wanted(url, wanted):
            for name in wanted:
                subdir = name if name != 'master' else ''
                yield name, bzrlib.urlutils.join(url, subdir)

        branch_list = list_wanted(url, wanted)
    else:
        branch_list = find_branches(repo)

    for name, url in branch_list:
        if not is_local:
            peers[name] = url
        branches[name] = url

    return origin

def fix_path(alias, orig_url):
    url = urlparse.urlparse(orig_url, 'file')
    if url.scheme != 'file' or os.path.isabs(url.path):
        return
    abs_url = urlparse.urljoin("%s/" % os.getcwd(), orig_url)
    cmd = ['git', 'config', 'remote.%s.url' % alias, "bzr::%s" % abs_url]
    subprocess.call(cmd)

def main(args):
    global marks, prefix, gitdir, dirname
    global tags, filenodes
    global blob_marks
    global parsed_refs
    global files_cache
    global is_tmp
    global branches, peers

    alias = args[1]
    url = args[2]

    tags = {}
    filenodes = {}
    blob_marks = {}
    parsed_refs = {}
    files_cache = {}
    marks = None
    branches = {}
    peers = {}

    if alias[5:] == url:
        is_tmp = True
        alias = hashlib.sha1(alias).hexdigest()
    else:
        is_tmp = False

    prefix = 'refs/bzr/%s' % alias
    gitdir = os.environ['GIT_DIR']
    dirname = os.path.join(gitdir, 'bzr', alias)

    if not is_tmp:
        fix_path(alias, url)

    if not os.path.exists(dirname):
        os.makedirs(dirname)

    if hasattr(bzrlib.ui.ui_factory, 'be_quiet'):
        bzrlib.ui.ui_factory.be_quiet(True)

    repo = get_repo(url, alias)

    marks_path = os.path.join(dirname, 'marks-int')
    marks = Marks(marks_path)

    parser = Parser(repo)
    for line in parser:
        if parser.check('capabilities'):
            do_capabilities(parser)
        elif parser.check('list'):
            do_list(parser)
        elif parser.check('import'):
            do_import(parser)
        elif parser.check('export'):
            do_export(parser)
        else:
            die('unhandled command: %s' % line)
        sys.stdout.flush()

def bye():
    if not marks:
        return
    if not is_tmp:
        marks.store()
    else:
        shutil.rmtree(dirname)

atexit.register(bye)
sys.exit(main(sys.argv))