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