Andrew's git - gitweb.git/blob - contrib/remote-helpers/git-remote-bzr

   1#!/usr/bin/env python
   2#
   3# Copyright (c) 2012 Felipe Contreras
   4#
   5
   6#
   7# Just copy to your ~/bin, or anywhere in your $PATH.
   8# Then you can clone with:
   9# % git clone bzr::/path/to/bzr/repo/or/url
  10#
  11# For example:
  12# % git clone bzr::$HOME/myrepo
  13# or
  14# % git clone bzr::lp:myrepo
  15#
  16# If you want to specify which branches you want track (per repo):
  17# git config remote-bzr.branches 'trunk, devel, test'
  18#
  19
  20import sys
  21
  22import bzrlib
  23if hasattr(bzrlib, "initialize"):
  24    bzrlib.initialize()
  25
  26import bzrlib.plugin
  27bzrlib.plugin.load_plugins()
  28
  29import bzrlib.generate_ids
  30import bzrlib.transport
  31import bzrlib.errors
  32import bzrlib.ui
  33import bzrlib.urlutils
  34import bzrlib.branch
  35
  36import sys
  37import os
  38import json
  39import re
  40import StringIO
  41import atexit, shutil, hashlib, urlparse, subprocess
  42
  43NAME_RE = re.compile('^([^<>]+)')
  44AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  45EMAIL_RE = re.compile('^([^<>]+[^ \\\t<>])?\\b(?:[ \\t<>]*?)\\b([^ \\t<>]+@[^ \\t<>]+)')
  46RAW_AUTHOR_RE = re.compile('^(\w+) (.+)? <(.*)> (\d+) ([+-]\d+)')
  47
  48def die(msg, *args):
  49    sys.stderr.write('ERROR: %s\n' % (msg % args))
  50    sys.exit(1)
  51
  52def warn(msg, *args):
  53    sys.stderr.write('WARNING: %s\n' % (msg % args))
  54
  55def gittz(tz):
  56    return '%+03d%02d' % (tz / 3600, tz % 3600 / 60)
  57
  58def get_config(config):
  59    cmd = ['git', 'config', '--get', config]
  60    process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  61    output, _ = process.communicate()
  62    return output
  63
  64class Marks:
  65
  66    def __init__(self, path):
  67        self.path = path
  68        self.tips = {}
  69        self.marks = {}
  70        self.rev_marks = {}
  71        self.last_mark = 0
  72        self.load()
  73
  74    def load(self):
  75        if not os.path.exists(self.path):
  76            return
  77
  78        tmp = json.load(open(self.path))
  79        self.tips = tmp['tips']
  80        self.marks = tmp['marks']
  81        self.last_mark = tmp['last-mark']
  82
  83        for rev, mark in self.marks.iteritems():
  84            self.rev_marks[mark] = rev
  85
  86    def dict(self):
  87        return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
  88
  89    def store(self):
  90        json.dump(self.dict(), open(self.path, 'w'))
  91
  92    def __str__(self):
  93        return str(self.dict())
  94
  95    def from_rev(self, rev):
  96        return self.marks[rev]
  97
  98    def to_rev(self, mark):
  99        return str(self.rev_marks[mark])
 100
 101    def next_mark(self):
 102        self.last_mark += 1
 103        return self.last_mark
 104
 105    def get_mark(self, rev):
 106        self.last_mark += 1
 107        self.marks[rev] = self.last_mark
 108        return self.last_mark
 109
 110    def is_marked(self, rev):
 111        return rev in self.marks
 112
 113    def new_mark(self, rev, mark):
 114        self.marks[rev] = mark
 115        self.rev_marks[mark] = rev
 116        self.last_mark = mark
 117
 118    def get_tip(self, branch):
 119        return self.tips.get(branch, None)
 120
 121    def set_tip(self, branch, tip):
 122        self.tips[branch] = tip
 123
 124class Parser:
 125
 126    def __init__(self, repo):
 127        self.repo = repo
 128        self.line = self.get_line()
 129
 130    def get_line(self):
 131        return sys.stdin.readline().strip()
 132
 133    def __getitem__(self, i):
 134        return self.line.split()[i]
 135
 136    def check(self, word):
 137        return self.line.startswith(word)
 138
 139    def each_block(self, separator):
 140        while self.line != separator:
 141            yield self.line
 142            self.line = self.get_line()
 143
 144    def __iter__(self):
 145        return self.each_block('')
 146
 147    def next(self):
 148        self.line = self.get_line()
 149        if self.line == 'done':
 150            self.line = None
 151
 152    def get_mark(self):
 153        i = self.line.index(':') + 1
 154        return int(self.line[i:])
 155
 156    def get_data(self):
 157        if not self.check('data'):
 158            return None
 159        i = self.line.index(' ') + 1
 160        size = int(self.line[i:])
 161        return sys.stdin.read(size)
 162
 163    def get_author(self):
 164        m = RAW_AUTHOR_RE.match(self.line)
 165        if not m:
 166            return None
 167        _, name, email, date, tz = m.groups()
 168        committer = '%s <%s>' % (name, email)
 169        tz = int(tz)
 170        tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 171        return (committer, int(date), tz)
 172
 173def rev_to_mark(rev):
 174    global marks
 175    return marks.from_rev(rev)
 176
 177def mark_to_rev(mark):
 178    global marks
 179    return marks.to_rev(mark)
 180
 181def fixup_user(user):
 182    name = mail = None
 183    user = user.replace('"', '')
 184    m = AUTHOR_RE.match(user)
 185    if m:
 186        name = m.group(1)
 187        mail = m.group(2).strip()
 188    else:
 189        m = EMAIL_RE.match(user)
 190        if m:
 191            name = m.group(1)
 192            mail = m.group(2)
 193        else:
 194            m = NAME_RE.match(user)
 195            if m:
 196                name = m.group(1).strip()
 197
 198    if not name:
 199        name = 'unknown'
 200    if not mail:
 201        mail = 'Unknown'
 202
 203    return '%s <%s>' % (name, mail)
 204
 205def get_filechanges(cur, prev):
 206    modified = {}
 207    removed = {}
 208
 209    changes = cur.changes_from(prev)
 210
 211    def u(s):
 212        return s.encode('utf-8')
 213
 214    for path, fid, kind in changes.added:
 215        modified[u(path)] = fid
 216    for path, fid, kind in changes.removed:
 217        removed[u(path)] = None
 218    for path, fid, kind, mod, _ in changes.modified:
 219        modified[u(path)] = fid
 220    for oldpath, newpath, fid, kind, mod, _ in changes.renamed:
 221        removed[u(oldpath)] = None
 222        if kind == 'directory':
 223            lst = cur.list_files(from_dir=newpath, recursive=True)
 224            for path, file_class, kind, fid, entry in lst:
 225                if kind != 'directory':
 226                    modified[u(newpath + '/' + path)] = fid
 227        else:
 228            modified[u(newpath)] = fid
 229
 230    return modified, removed
 231
 232def export_files(tree, files):
 233    global marks, filenodes
 234
 235    final = []
 236    for path, fid in files.iteritems():
 237        kind = tree.kind(fid)
 238
 239        h = tree.get_file_sha1(fid)
 240
 241        if kind == 'symlink':
 242            d = tree.get_symlink_target(fid)
 243            mode = '120000'
 244        elif kind == 'file':
 245
 246            if tree.is_executable(fid):
 247                mode = '100755'
 248            else:
 249                mode = '100644'
 250
 251            # is the blob already exported?
 252            if h in filenodes:
 253                mark = filenodes[h]
 254                final.append((mode, mark, path))
 255                continue
 256
 257            d = tree.get_file_text(fid)
 258        elif kind == 'directory':
 259            continue
 260        else:
 261            die("Unhandled kind '%s' for path '%s'" % (kind, path))
 262
 263        mark = marks.next_mark()
 264        filenodes[h] = mark
 265
 266        print "blob"
 267        print "mark :%u" % mark
 268        print "data %d" % len(d)
 269        print d
 270
 271        final.append((mode, mark, path))
 272
 273    return final
 274
 275def export_branch(repo, name):
 276    global prefix
 277
 278    ref = '%s/heads/%s' % (prefix, name)
 279    tip = marks.get_tip(name)
 280
 281    branch = bzrlib.branch.Branch.open(branches[name])
 282    repo = branch.repository
 283
 284    branch.lock_read()
 285    revs = branch.iter_merge_sorted_revisions(None, tip, 'exclude', 'forward')
 286    try:
 287        tip_revno = branch.revision_id_to_revno(tip)
 288        last_revno, _ = branch.last_revision_info()
 289        total = last_revno - tip_revno
 290    except bzrlib.errors.NoSuchRevision:
 291        tip_revno = 0
 292        total = 0
 293
 294    for revid, _, seq, _ in revs:
 295
 296        if marks.is_marked(revid):
 297            continue
 298
 299        rev = repo.get_revision(revid)
 300        revno = seq[0]
 301
 302        parents = rev.parent_ids
 303        time = rev.timestamp
 304        tz = rev.timezone
 305        committer = rev.committer.encode('utf-8')
 306        committer = "%s %u %s" % (fixup_user(committer), time, gittz(tz))
 307        authors = rev.get_apparent_authors()
 308        if authors:
 309            author = authors[0].encode('utf-8')
 310            author = "%s %u %s" % (fixup_user(author), time, gittz(tz))
 311        else:
 312            author = committer
 313        msg = rev.message.encode('utf-8')
 314
 315        msg += '\n'
 316
 317        if len(parents) == 0:
 318            parent = bzrlib.revision.NULL_REVISION
 319        else:
 320            parent = parents[0]
 321
 322        cur_tree = repo.revision_tree(revid)
 323        prev = repo.revision_tree(parent)
 324        modified, removed = get_filechanges(cur_tree, prev)
 325
 326        modified_final = export_files(cur_tree, modified)
 327
 328        if len(parents) == 0:
 329            print 'reset %s' % ref
 330
 331        print "commit %s" % ref
 332        print "mark :%d" % (marks.get_mark(revid))
 333        print "author %s" % (author)
 334        print "committer %s" % (committer)
 335        print "data %d" % (len(msg))
 336        print msg
 337
 338        for i, p in enumerate(parents):
 339            try:
 340                m = rev_to_mark(p)
 341            except KeyError:
 342                # ghost?
 343                continue
 344            if i == 0:
 345                print "from :%s" % m
 346            else:
 347                print "merge :%s" % m
 348
 349        for f in removed:
 350            print "D %s" % (f,)
 351        for f in modified_final:
 352            print "M %s :%u %s" % f
 353        print
 354
 355        if len(seq) > 1:
 356            # let's skip branch revisions from the progress report
 357            continue
 358
 359        progress = (revno - tip_revno)
 360        if (progress % 100 == 0):
 361            if total:
 362                print "progress revision %d '%s' (%d/%d)" % (revno, name, progress, total)
 363            else:
 364                print "progress revision %d '%s' (%d)" % (revno, name, progress)
 365
 366    branch.unlock()
 367
 368    revid = branch.last_revision()
 369
 370    # make sure the ref is updated
 371    print "reset %s" % ref
 372    print "from :%u" % rev_to_mark(revid)
 373    print
 374
 375    marks.set_tip(name, revid)
 376
 377def export_tag(repo, name):
 378    global tags, prefix
 379
 380    ref = '%s/tags/%s' % (prefix, name)
 381    print "reset %s" % ref
 382    print "from :%u" % rev_to_mark(tags[name])
 383    print
 384
 385def do_import(parser):
 386    global dirname
 387
 388    repo = parser.repo
 389    path = os.path.join(dirname, 'marks-git')
 390
 391    print "feature done"
 392    if os.path.exists(path):
 393        print "feature import-marks=%s" % path
 394    print "feature export-marks=%s" % path
 395    print "feature force"
 396    sys.stdout.flush()
 397
 398    while parser.check('import'):
 399        ref = parser[1]
 400        if ref.startswith('refs/heads/'):
 401            name = ref[len('refs/heads/'):]
 402            export_branch(repo, name)
 403        if ref.startswith('refs/tags/'):
 404            name = ref[len('refs/tags/'):]
 405            export_tag(repo, name)
 406        parser.next()
 407
 408    print 'done'
 409
 410    sys.stdout.flush()
 411
 412def parse_blob(parser):
 413    global blob_marks
 414
 415    parser.next()
 416    mark = parser.get_mark()
 417    parser.next()
 418    data = parser.get_data()
 419    blob_marks[mark] = data
 420    parser.next()
 421
 422class CustomTree():
 423
 424    def __init__(self, branch, revid, parents, files):
 425        global files_cache
 426
 427        self.updates = {}
 428        self.branch = branch
 429
 430        def copy_tree(revid):
 431            files = files_cache[revid] = {}
 432            branch.lock_read()
 433            tree = branch.repository.revision_tree(revid)
 434            try:
 435                for path, entry in tree.iter_entries_by_dir():
 436                    files[path] = [entry.file_id, None]
 437            finally:
 438                branch.unlock()
 439            return files
 440
 441        if len(parents) == 0:
 442            self.base_id = bzrlib.revision.NULL_REVISION
 443            self.base_files = {}
 444        else:
 445            self.base_id = parents[0]
 446            self.base_files = files_cache.get(self.base_id, None)
 447            if not self.base_files:
 448                self.base_files = copy_tree(self.base_id)
 449
 450        self.files = files_cache[revid] = self.base_files.copy()
 451        self.rev_files = {}
 452
 453        for path, data in self.files.iteritems():
 454            fid, mark = data
 455            self.rev_files[fid] = [path, mark]
 456
 457        for path, f in files.iteritems():
 458            fid, mark = self.files.get(path, [None, None])
 459            if not fid:
 460                fid = bzrlib.generate_ids.gen_file_id(path)
 461            f['path'] = path
 462            self.rev_files[fid] = [path, mark]
 463            self.updates[fid] = f
 464
 465    def last_revision(self):
 466        return self.base_id
 467
 468    def iter_changes(self):
 469        changes = []
 470
 471        def get_parent(dirname, basename):
 472            parent_fid, mark = self.base_files.get(dirname, [None, None])
 473            if parent_fid:
 474                return parent_fid
 475            parent_fid, mark = self.files.get(dirname, [None, None])
 476            if parent_fid:
 477                return parent_fid
 478            if basename == '':
 479                return None
 480            fid = bzrlib.generate_ids.gen_file_id(path)
 481            add_entry(fid, dirname, 'directory')
 482            return fid
 483
 484        def add_entry(fid, path, kind, mode = None):
 485            dirname, basename = os.path.split(path)
 486            parent_fid = get_parent(dirname, basename)
 487
 488            executable = False
 489            if mode == '100755':
 490                executable = True
 491            elif mode == '120000':
 492                kind = 'symlink'
 493
 494            change = (fid,
 495                    (None, path),
 496                    True,
 497                    (False, True),
 498                    (None, parent_fid),
 499                    (None, basename),
 500                    (None, kind),
 501                    (None, executable))
 502            self.files[path] = [change[0], None]
 503            changes.append(change)
 504
 505        def update_entry(fid, path, kind, mode = None):
 506            dirname, basename = os.path.split(path)
 507            parent_fid = get_parent(dirname, basename)
 508
 509            executable = False
 510            if mode == '100755':
 511                executable = True
 512            elif mode == '120000':
 513                kind = 'symlink'
 514
 515            change = (fid,
 516                    (path, path),
 517                    True,
 518                    (True, True),
 519                    (None, parent_fid),
 520                    (None, basename),
 521                    (None, kind),
 522                    (None, executable))
 523            self.files[path] = [change[0], None]
 524            changes.append(change)
 525
 526        def remove_entry(fid, path, kind):
 527            dirname, basename = os.path.split(path)
 528            parent_fid = get_parent(dirname, basename)
 529            change = (fid,
 530                    (path, None),
 531                    True,
 532                    (True, False),
 533                    (parent_fid, None),
 534                    (None, None),
 535                    (None, None),
 536                    (None, None))
 537            del self.files[path]
 538            changes.append(change)
 539
 540        for fid, f in self.updates.iteritems():
 541            path = f['path']
 542
 543            if 'deleted' in f:
 544                remove_entry(fid, path, 'file')
 545                continue
 546
 547            if path in self.base_files:
 548                update_entry(fid, path, 'file', f['mode'])
 549            else:
 550                add_entry(fid, path, 'file', f['mode'])
 551
 552            self.files[path][1] = f['mark']
 553            self.rev_files[fid][1] = f['mark']
 554
 555        return changes
 556
 557    def get_content(self, file_id):
 558        path, mark = self.rev_files[file_id]
 559        if mark:
 560            return blob_marks[mark]
 561
 562        # last resort
 563        tree = self.branch.repository.revision_tree(self.base_id)
 564        return tree.get_file_text(file_id)
 565
 566    def get_file_with_stat(self, file_id, path=None):
 567        content = self.get_content(file_id)
 568        return (StringIO.StringIO(content), None)
 569
 570    def get_symlink_target(self, file_id):
 571        return self.get_content(file_id)
 572
 573    def id2path(self, file_id):
 574        path, mark = self.rev_files[file_id]
 575        return path
 576
 577def c_style_unescape(string):
 578    if string[0] == string[-1] == '"':
 579        return string.decode('string-escape')[1:-1]
 580    return string
 581
 582def parse_commit(parser):
 583    global marks, blob_marks, parsed_refs
 584    global mode
 585
 586    parents = []
 587
 588    ref = parser[1]
 589    parser.next()
 590
 591    if ref.startswith('refs/heads/'):
 592        name = ref[len('refs/heads/'):]
 593        branch = bzrlib.branch.Branch.open(branches[name])
 594    else:
 595        die('unknown ref')
 596
 597    commit_mark = parser.get_mark()
 598    parser.next()
 599    author = parser.get_author()
 600    parser.next()
 601    committer = parser.get_author()
 602    parser.next()
 603    data = parser.get_data()
 604    parser.next()
 605    if parser.check('from'):
 606        parents.append(parser.get_mark())
 607        parser.next()
 608    while parser.check('merge'):
 609        parents.append(parser.get_mark())
 610        parser.next()
 611
 612    # fast-export adds an extra newline
 613    if data[-1] == '\n':
 614        data = data[:-1]
 615
 616    files = {}
 617
 618    for line in parser:
 619        if parser.check('M'):
 620            t, m, mark_ref, path = line.split(' ', 3)
 621            mark = int(mark_ref[1:])
 622            f = { 'mode' : m, 'mark' : mark }
 623        elif parser.check('D'):
 624            t, path = line.split(' ')
 625            f = { 'deleted' : True }
 626        else:
 627            die('Unknown file command: %s' % line)
 628        path = c_style_unescape(path).decode('utf-8')
 629        files[path] = f
 630
 631    committer, date, tz = committer
 632    parents = [mark_to_rev(p) for p in parents]
 633    revid = bzrlib.generate_ids.gen_revision_id(committer, date)
 634    props = {}
 635    props['branch-nick'] = branch.nick
 636
 637    mtree = CustomTree(branch, revid, parents, files)
 638    changes = mtree.iter_changes()
 639
 640    branch.lock_write()
 641    try:
 642        builder = branch.get_commit_builder(parents, None, date, tz, committer, props, revid)
 643        try:
 644            list(builder.record_iter_changes(mtree, mtree.last_revision(), changes))
 645            builder.finish_inventory()
 646            builder.commit(data.decode('utf-8', 'replace'))
 647        except Exception, e:
 648            builder.abort()
 649            raise
 650    finally:
 651        branch.unlock()
 652
 653    parsed_refs[ref] = revid
 654    marks.new_mark(revid, commit_mark)
 655
 656def parse_reset(parser):
 657    global parsed_refs
 658
 659    ref = parser[1]
 660    parser.next()
 661
 662    # ugh
 663    if parser.check('commit'):
 664        parse_commit(parser)
 665        return
 666    if not parser.check('from'):
 667        return
 668    from_mark = parser.get_mark()
 669    parser.next()
 670
 671    parsed_refs[ref] = mark_to_rev(from_mark)
 672
 673def do_export(parser):
 674    global parsed_refs, dirname
 675
 676    parser.next()
 677
 678    for line in parser.each_block('done'):
 679        if parser.check('blob'):
 680            parse_blob(parser)
 681        elif parser.check('commit'):
 682            parse_commit(parser)
 683        elif parser.check('reset'):
 684            parse_reset(parser)
 685        elif parser.check('tag'):
 686            pass
 687        elif parser.check('feature'):
 688            pass
 689        else:
 690            die('unhandled export command: %s' % line)
 691
 692    for ref, revid in parsed_refs.iteritems():
 693        if ref.startswith('refs/heads/'):
 694            name = ref[len('refs/heads/'):]
 695            branch = bzrlib.branch.Branch.open(branches[name])
 696            branch.generate_revision_history(revid, marks.get_tip(name))
 697
 698            if name in peers:
 699                peer = bzrlib.branch.Branch.open(peers[name])
 700                try:
 701                    peer.bzrdir.push_branch(branch, revision_id=revid)
 702                except bzrlib.errors.DivergedBranches:
 703                    print "error %s non-fast forward" % ref
 704                    continue
 705
 706            try:
 707                wt = branch.bzrdir.open_workingtree()
 708                wt.update()
 709            except bzrlib.errors.NoWorkingTree:
 710                pass
 711        elif ref.startswith('refs/tags/'):
 712            # TODO: implement tag push
 713            print "error %s pushing tags not supported" % ref
 714            continue
 715        else:
 716            # transport-helper/fast-export bugs
 717            continue
 718
 719        print "ok %s" % ref
 720
 721    print
 722
 723def do_capabilities(parser):
 724    global dirname
 725
 726    print "import"
 727    print "export"
 728    print "refspec refs/heads/*:%s/heads/*" % prefix
 729    print "refspec refs/tags/*:%s/tags/*" % prefix
 730
 731    path = os.path.join(dirname, 'marks-git')
 732
 733    if os.path.exists(path):
 734        print "*import-marks %s" % path
 735    print "*export-marks %s" % path
 736
 737    print
 738
 739def ref_is_valid(name):
 740    return not True in [c in name for c in '~^: \\']
 741
 742def do_list(parser):
 743    global tags
 744
 745    master_branch = None
 746
 747    for name in branches:
 748        if not master_branch:
 749            master_branch = name
 750        print "? refs/heads/%s" % name
 751
 752    branch = bzrlib.branch.Branch.open(branches[master_branch])
 753    branch.lock_read()
 754    for tag, revid in branch.tags.get_tag_dict().items():
 755        try:
 756            branch.revision_id_to_dotted_revno(revid)
 757        except bzrlib.errors.NoSuchRevision:
 758            continue
 759        if not ref_is_valid(tag):
 760            continue
 761        print "? refs/tags/%s" % tag
 762        tags[tag] = revid
 763    branch.unlock()
 764
 765    print "@refs/heads/%s HEAD" % master_branch
 766    print
 767
 768def get_remote_branch(origin, remote_branch, name):
 769    global dirname, peers
 770
 771    branch_path = os.path.join(dirname, 'clone', name)
 772    if os.path.exists(branch_path):
 773        # pull
 774        d = bzrlib.bzrdir.BzrDir.open(branch_path)
 775        branch = d.open_branch()
 776        try:
 777            branch.pull(remote_branch, [], None, False)
 778        except bzrlib.errors.DivergedBranches:
 779            # use remote branch for now
 780            return remote_branch
 781    else:
 782        # clone
 783        d = origin.sprout(branch_path, None,
 784                hardlink=True, create_tree_if_local=False,
 785                force_new_repo=False,
 786                source_branch=remote_branch)
 787        branch = d.open_branch()
 788
 789    return branch
 790
 791def find_branches(repo, wanted):
 792    transport = repo.bzrdir.root_transport
 793
 794    for fn in transport.iter_files_recursive():
 795        if not fn.endswith('.bzr/branch-format'):
 796            continue
 797
 798        name = subdir = fn[:-len('/.bzr/branch-format')]
 799        name = name if name != '' else 'master'
 800        name = name.replace('/', '+')
 801
 802        if wanted and not name in wanted:
 803            continue
 804
 805        try:
 806            cur = transport.clone(subdir)
 807            branch = bzrlib.branch.Branch.open_from_transport(cur)
 808        except bzrlib.errors.NotBranchError:
 809            continue
 810        else:
 811            yield name, branch
 812
 813def get_repo(url, alias):
 814    global dirname, peer, branches
 815
 816    normal_url = bzrlib.urlutils.normalize_url(url)
 817    origin = bzrlib.bzrdir.BzrDir.open(url)
 818    is_local = isinstance(origin.transport, bzrlib.transport.local.LocalTransport)
 819
 820    shared_path = os.path.join(gitdir, 'bzr')
 821    try:
 822        shared_dir = bzrlib.bzrdir.BzrDir.open(shared_path)
 823    except bzrlib.errors.NotBranchError:
 824        shared_dir = bzrlib.bzrdir.BzrDir.create(shared_path)
 825    try:
 826        shared_repo = shared_dir.open_repository()
 827    except bzrlib.errors.NoRepositoryPresent:
 828        shared_repo = shared_dir.create_repository(shared=True)
 829
 830    if not is_local:
 831        clone_path = os.path.join(dirname, 'clone')
 832        if not os.path.exists(clone_path):
 833            os.mkdir(clone_path)
 834        else:
 835            # check and remove old organization
 836            try:
 837                bdir = bzrlib.bzrdir.BzrDir.open(clone_path)
 838                bdir.destroy_repository()
 839            except bzrlib.errors.NotBranchError:
 840                pass
 841            except bzrlib.errors.NoRepositoryPresent:
 842                pass
 843
 844    try:
 845        repo = origin.open_repository()
 846        if not repo.user_transport.listable():
 847            # this repository is not usable for us
 848            raise bzrlib.errors.NoRepositoryPresent(repo.bzrdir)
 849    except bzrlib.errors.NoRepositoryPresent:
 850        # branch
 851
 852        name = 'master'
 853        remote_branch = origin.open_branch()
 854
 855        if not is_local:
 856            peers[name] = remote_branch.base
 857            branch = get_remote_branch(origin, remote_branch, name)
 858        else:
 859            branch = remote_branch
 860
 861        branches[name] = branch.base
 862
 863        return branch.repository
 864    else:
 865        # repository
 866
 867        wanted = get_config('remote-bzr.branches').rstrip().split(', ')
 868        # stupid python
 869        wanted = [e for e in wanted if e]
 870
 871        for name, remote_branch in find_branches(repo, wanted):
 872
 873            if not is_local:
 874                peers[name] = remote_branch.base
 875                branch = get_remote_branch(origin, remote_branch, name)
 876            else:
 877                branch = remote_branch
 878
 879            branches[name] = branch.base
 880
 881        return repo
 882
 883def fix_path(alias, orig_url):
 884    url = urlparse.urlparse(orig_url, 'file')
 885    if url.scheme != 'file' or os.path.isabs(url.path):
 886        return
 887    abs_url = urlparse.urljoin("%s/" % os.getcwd(), orig_url)
 888    cmd = ['git', 'config', 'remote.%s.url' % alias, "bzr::%s" % abs_url]
 889    subprocess.call(cmd)
 890
 891def main(args):
 892    global marks, prefix, gitdir, dirname
 893    global tags, filenodes
 894    global blob_marks
 895    global parsed_refs
 896    global files_cache
 897    global is_tmp
 898    global branches, peers
 899
 900    alias = args[1]
 901    url = args[2]
 902
 903    tags = {}
 904    filenodes = {}
 905    blob_marks = {}
 906    parsed_refs = {}
 907    files_cache = {}
 908    marks = None
 909    branches = {}
 910    peers = {}
 911
 912    if alias[5:] == url:
 913        is_tmp = True
 914        alias = hashlib.sha1(alias).hexdigest()
 915    else:
 916        is_tmp = False
 917
 918    prefix = 'refs/bzr/%s' % alias
 919    gitdir = os.environ['GIT_DIR']
 920    dirname = os.path.join(gitdir, 'bzr', alias)
 921
 922    if not is_tmp:
 923        fix_path(alias, url)
 924
 925    if not os.path.exists(dirname):
 926        os.makedirs(dirname)
 927
 928    if hasattr(bzrlib.ui.ui_factory, 'be_quiet'):
 929        bzrlib.ui.ui_factory.be_quiet(True)
 930
 931    repo = get_repo(url, alias)
 932
 933    marks_path = os.path.join(dirname, 'marks-int')
 934    marks = Marks(marks_path)
 935
 936    parser = Parser(repo)
 937    for line in parser:
 938        if parser.check('capabilities'):
 939            do_capabilities(parser)
 940        elif parser.check('list'):
 941            do_list(parser)
 942        elif parser.check('import'):
 943            do_import(parser)
 944        elif parser.check('export'):
 945            do_export(parser)
 946        else:
 947            die('unhandled command: %s' % line)
 948        sys.stdout.flush()
 949
 950def bye():
 951    if not marks:
 952        return
 953    if not is_tmp:
 954        marks.store()
 955    else:
 956        shutil.rmtree(dirname)
 957
 958atexit.register(bye)
 959sys.exit(main(sys.argv))