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

   1#!/usr/bin/env python
   2#
   3# Copyright (c) 2012 Felipe Contreras
   4#
   5
   6# Inspired by Rocco Rutte's hg-fast-export
   7
   8# Just copy to your ~/bin, or anywhere in your $PATH.
   9# Then you can clone with:
  10# git clone hg::/path/to/mercurial/repo/
  11
  12from mercurial import hg, ui, bookmarks, context, util, encoding, node
  13
  14import re
  15import sys
  16import os
  17import json
  18import shutil
  19import subprocess
  20import urllib
  21
  22#
  23# If you want to switch to hg-git compatibility mode:
  24# git config --global remote-hg.hg-git-compat true
  25#
  26# If you are not in hg-git-compat mode and want to disable the tracking of
  27# named branches:
  28# git config --global remote-hg.track-branches false
  29#
  30# git:
  31# Sensible defaults for git.
  32# hg bookmarks are exported as git branches, hg branches are prefixed
  33# with 'branches/', HEAD is a special case.
  34#
  35# hg:
  36# Emulate hg-git.
  37# Only hg bookmarks are exported as git branches.
  38# Commits are modified to preserve hg information and allow bidirectionality.
  39#
  40
  41NAME_RE = re.compile('^([^<>]+)')
  42AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  43AUTHOR_HG_RE = re.compile('^(.*?) ?<(.*?)(?:>(.+)?)?$')
  44RAW_AUTHOR_RE = re.compile('^(\w+) (?:(.+)? )?<(.*)> (\d+) ([+-]\d+)')
  45
  46def die(msg, *args):
  47    sys.stderr.write('ERROR: %s\n' % (msg % args))
  48    sys.exit(1)
  49
  50def warn(msg, *args):
  51    sys.stderr.write('WARNING: %s\n' % (msg % args))
  52
  53def gitmode(flags):
  54    return 'l' in flags and '120000' or 'x' in flags and '100755' or '100644'
  55
  56def gittz(tz):
  57    return '%+03d%02d' % (-tz / 3600, -tz % 3600 / 60)
  58
  59def hgmode(mode):
  60    m = { '100755': 'x', '120000': 'l' }
  61    return m.get(mode, '')
  62
  63def hghex(node):
  64    return hg.node.hex(node)
  65
  66def get_config(config):
  67    cmd = ['git', 'config', '--get', config]
  68    process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  69    output, _ = process.communicate()
  70    return output
  71
  72class Marks:
  73
  74    def __init__(self, path):
  75        self.path = path
  76        self.tips = {}
  77        self.marks = {}
  78        self.rev_marks = {}
  79        self.last_mark = 0
  80
  81        self.load()
  82
  83    def load(self):
  84        if not os.path.exists(self.path):
  85            return
  86
  87        tmp = json.load(open(self.path))
  88
  89        self.tips = tmp['tips']
  90        self.marks = tmp['marks']
  91        self.last_mark = tmp['last-mark']
  92
  93        for rev, mark in self.marks.iteritems():
  94            self.rev_marks[mark] = int(rev)
  95
  96    def dict(self):
  97        return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
  98
  99    def store(self):
 100        json.dump(self.dict(), open(self.path, 'w'))
 101
 102    def __str__(self):
 103        return str(self.dict())
 104
 105    def from_rev(self, rev):
 106        return self.marks[str(rev)]
 107
 108    def to_rev(self, mark):
 109        return self.rev_marks[mark]
 110
 111    def get_mark(self, rev):
 112        self.last_mark += 1
 113        self.marks[str(rev)] = self.last_mark
 114        return self.last_mark
 115
 116    def new_mark(self, rev, mark):
 117        self.marks[str(rev)] = mark
 118        self.rev_marks[mark] = rev
 119        self.last_mark = mark
 120
 121    def is_marked(self, rev):
 122        return self.marks.has_key(str(rev))
 123
 124    def get_tip(self, branch):
 125        return self.tips.get(branch, 0)
 126
 127    def set_tip(self, branch, tip):
 128        self.tips[branch] = tip
 129
 130class Parser:
 131
 132    def __init__(self, repo):
 133        self.repo = repo
 134        self.line = self.get_line()
 135
 136    def get_line(self):
 137        return sys.stdin.readline().strip()
 138
 139    def __getitem__(self, i):
 140        return self.line.split()[i]
 141
 142    def check(self, word):
 143        return self.line.startswith(word)
 144
 145    def each_block(self, separator):
 146        while self.line != separator:
 147            yield self.line
 148            self.line = self.get_line()
 149
 150    def __iter__(self):
 151        return self.each_block('')
 152
 153    def next(self):
 154        self.line = self.get_line()
 155        if self.line == 'done':
 156            self.line = None
 157
 158    def get_mark(self):
 159        i = self.line.index(':') + 1
 160        return int(self.line[i:])
 161
 162    def get_data(self):
 163        if not self.check('data'):
 164            return None
 165        i = self.line.index(' ') + 1
 166        size = int(self.line[i:])
 167        return sys.stdin.read(size)
 168
 169    def get_author(self):
 170        global bad_mail
 171
 172        ex = None
 173        m = RAW_AUTHOR_RE.match(self.line)
 174        if not m:
 175            return None
 176        _, name, email, date, tz = m.groups()
 177        if name and 'ext:' in name:
 178            m = re.match('^(.+?) ext:\((.+)\)$', name)
 179            if m:
 180                name = m.group(1)
 181                ex = urllib.unquote(m.group(2))
 182
 183        if email != bad_mail:
 184            if name:
 185                user = '%s <%s>' % (name, email)
 186            else:
 187                user = '<%s>' % (email)
 188        else:
 189            user = name
 190
 191        if ex:
 192            user += ex
 193
 194        tz = int(tz)
 195        tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 196        return (user, int(date), -tz)
 197
 198def export_file(fc):
 199    d = fc.data()
 200    print "M %s inline %s" % (gitmode(fc.flags()), fc.path())
 201    print "data %d" % len(d)
 202    print d
 203
 204def get_filechanges(repo, ctx, parent):
 205    modified = set()
 206    added = set()
 207    removed = set()
 208
 209    cur = ctx.manifest()
 210    prev = repo[parent].manifest().copy()
 211
 212    for fn in cur:
 213        if fn in prev:
 214            if (cur.flags(fn) != prev.flags(fn) or cur[fn] != prev[fn]):
 215                modified.add(fn)
 216            del prev[fn]
 217        else:
 218            added.add(fn)
 219    removed |= set(prev.keys())
 220
 221    return added | modified, removed
 222
 223def fixup_user_git(user):
 224    name = mail = None
 225    user = user.replace('"', '')
 226    m = AUTHOR_RE.match(user)
 227    if m:
 228        name = m.group(1)
 229        mail = m.group(2).strip()
 230    else:
 231        m = NAME_RE.match(user)
 232        if m:
 233            name = m.group(1).strip()
 234    return (name, mail)
 235
 236def fixup_user_hg(user):
 237    def sanitize(name):
 238        # stole this from hg-git
 239        return re.sub('[<>\n]', '?', name.lstrip('< ').rstrip('> '))
 240
 241    m = AUTHOR_HG_RE.match(user)
 242    if m:
 243        name = sanitize(m.group(1))
 244        mail = sanitize(m.group(2))
 245        ex = m.group(3)
 246        if ex:
 247            name += ' ext:(' + urllib.quote(ex) + ')'
 248    else:
 249        name = sanitize(user)
 250        if '@' in user:
 251            mail = name
 252        else:
 253            mail = None
 254
 255    return (name, mail)
 256
 257def fixup_user(user):
 258    global mode, bad_mail
 259
 260    if mode == 'git':
 261        name, mail = fixup_user_git(user)
 262    else:
 263        name, mail = fixup_user_hg(user)
 264
 265    if not name:
 266        name = bad_name
 267    if not mail:
 268        mail = bad_mail
 269
 270    return '%s <%s>' % (name, mail)
 271
 272def get_repo(url, alias):
 273    global dirname, peer
 274
 275    myui = ui.ui()
 276    myui.setconfig('ui', 'interactive', 'off')
 277    myui.fout = sys.stderr
 278
 279    if hg.islocal(url):
 280        repo = hg.repository(myui, url)
 281    else:
 282        local_path = os.path.join(dirname, 'clone')
 283        if not os.path.exists(local_path):
 284            peer, dstpeer = hg.clone(myui, {}, url, local_path, update=False, pull=True)
 285            repo = dstpeer.local()
 286        else:
 287            repo = hg.repository(myui, local_path)
 288            peer = hg.peer(myui, {}, url)
 289            repo.pull(peer, heads=None, force=True)
 290
 291    return repo
 292
 293def rev_to_mark(rev):
 294    global marks
 295    return marks.from_rev(rev)
 296
 297def mark_to_rev(mark):
 298    global marks
 299    return marks.to_rev(mark)
 300
 301def export_ref(repo, name, kind, head):
 302    global prefix, marks, mode
 303
 304    ename = '%s/%s' % (kind, name)
 305    tip = marks.get_tip(ename)
 306
 307    # mercurial takes too much time checking this
 308    if tip and tip == head.rev():
 309        # nothing to do
 310        return
 311    revs = xrange(tip, head.rev() + 1)
 312    count = 0
 313
 314    revs = [rev for rev in revs if not marks.is_marked(rev)]
 315
 316    for rev in revs:
 317
 318        c = repo[rev]
 319        (manifest, user, (time, tz), files, desc, extra) = repo.changelog.read(c.node())
 320        rev_branch = extra['branch']
 321
 322        author = "%s %d %s" % (fixup_user(user), time, gittz(tz))
 323        if 'committer' in extra:
 324            user, time, tz = extra['committer'].rsplit(' ', 2)
 325            committer = "%s %s %s" % (user, time, gittz(int(tz)))
 326        else:
 327            committer = author
 328
 329        parents = [p for p in repo.changelog.parentrevs(rev) if p >= 0]
 330
 331        if len(parents) == 0:
 332            modified = c.manifest().keys()
 333            removed = []
 334        else:
 335            modified, removed = get_filechanges(repo, c, parents[0])
 336
 337        if mode == 'hg':
 338            extra_msg = ''
 339
 340            if rev_branch != 'default':
 341                extra_msg += 'branch : %s\n' % rev_branch
 342
 343            renames = []
 344            for f in c.files():
 345                if f not in c.manifest():
 346                    continue
 347                rename = c.filectx(f).renamed()
 348                if rename:
 349                    renames.append((rename[0], f))
 350
 351            for e in renames:
 352                extra_msg += "rename : %s => %s\n" % e
 353
 354            for key, value in extra.iteritems():
 355                if key in ('author', 'committer', 'encoding', 'message', 'branch', 'hg-git'):
 356                    continue
 357                else:
 358                    extra_msg += "extra : %s : %s\n" % (key, urllib.quote(value))
 359
 360            desc += '\n'
 361            if extra_msg:
 362                desc += '\n--HG--\n' + extra_msg
 363
 364        if len(parents) == 0 and rev:
 365            print 'reset %s/%s' % (prefix, ename)
 366
 367        print "commit %s/%s" % (prefix, ename)
 368        print "mark :%d" % (marks.get_mark(rev))
 369        print "author %s" % (author)
 370        print "committer %s" % (committer)
 371        print "data %d" % (len(desc))
 372        print desc
 373
 374        if len(parents) > 0:
 375            print "from :%s" % (rev_to_mark(parents[0]))
 376            if len(parents) > 1:
 377                print "merge :%s" % (rev_to_mark(parents[1]))
 378
 379        for f in modified:
 380            export_file(c.filectx(f))
 381        for f in removed:
 382            print "D %s" % (f)
 383        print
 384
 385        count += 1
 386        if (count % 100 == 0):
 387            print "progress revision %d '%s' (%d/%d)" % (rev, name, count, len(revs))
 388            print "#############################################################"
 389
 390    # make sure the ref is updated
 391    print "reset %s/%s" % (prefix, ename)
 392    print "from :%u" % rev_to_mark(rev)
 393    print
 394
 395    marks.set_tip(ename, rev)
 396
 397def export_tag(repo, tag):
 398    export_ref(repo, tag, 'tags', repo[tag])
 399
 400def export_bookmark(repo, bmark):
 401    head = bmarks[bmark]
 402    export_ref(repo, bmark, 'bookmarks', head)
 403
 404def export_branch(repo, branch):
 405    tip = get_branch_tip(repo, branch)
 406    head = repo[tip]
 407    export_ref(repo, branch, 'branches', head)
 408
 409def export_head(repo):
 410    global g_head
 411    export_ref(repo, g_head[0], 'bookmarks', g_head[1])
 412
 413def do_capabilities(parser):
 414    global prefix, dirname
 415
 416    print "import"
 417    print "export"
 418    print "refspec refs/heads/branches/*:%s/branches/*" % prefix
 419    print "refspec refs/heads/*:%s/bookmarks/*" % prefix
 420    print "refspec refs/tags/*:%s/tags/*" % prefix
 421
 422    path = os.path.join(dirname, 'marks-git')
 423
 424    if os.path.exists(path):
 425        print "*import-marks %s" % path
 426    print "*export-marks %s" % path
 427
 428    print
 429
 430def get_branch_tip(repo, branch):
 431    global branches
 432
 433    heads = branches.get(branch, None)
 434    if not heads:
 435        return None
 436
 437    # verify there's only one head
 438    if (len(heads) > 1):
 439        warn("Branch '%s' has more than one head, consider merging" % branch)
 440        # older versions of mercurial don't have this
 441        if hasattr(repo, "branchtip"):
 442            return repo.branchtip(branch)
 443
 444    return heads[0]
 445
 446def list_head(repo, cur):
 447    global g_head, bmarks
 448
 449    head = bookmarks.readcurrent(repo)
 450    if head:
 451        node = repo[head]
 452    else:
 453        # fake bookmark from current branch
 454        head = cur
 455        node = repo['.']
 456        if not node:
 457            node = repo['tip']
 458        if not node:
 459            return
 460        if head == 'default':
 461            head = 'master'
 462        bmarks[head] = node
 463
 464    print "@refs/heads/%s HEAD" % head
 465    g_head = (head, node)
 466
 467def do_list(parser):
 468    global branches, bmarks, mode, track_branches
 469
 470    repo = parser.repo
 471    for bmark, node in bookmarks.listbookmarks(repo).iteritems():
 472        bmarks[bmark] = repo[node]
 473
 474    cur = repo.dirstate.branch()
 475
 476    list_head(repo, cur)
 477
 478    if track_branches:
 479        for branch in repo.branchmap():
 480            heads = repo.branchheads(branch)
 481            if len(heads):
 482                branches[branch] = heads
 483
 484        for branch in branches:
 485            print "? refs/heads/branches/%s" % branch
 486
 487    for bmark in bmarks:
 488        print "? refs/heads/%s" % bmark
 489
 490    for tag, node in repo.tagslist():
 491        if tag == 'tip':
 492            continue
 493        print "? refs/tags/%s" % tag
 494
 495    print
 496
 497def do_import(parser):
 498    repo = parser.repo
 499
 500    path = os.path.join(dirname, 'marks-git')
 501
 502    print "feature done"
 503    if os.path.exists(path):
 504        print "feature import-marks=%s" % path
 505    print "feature export-marks=%s" % path
 506    sys.stdout.flush()
 507
 508    tmp = encoding.encoding
 509    encoding.encoding = 'utf-8'
 510
 511    # lets get all the import lines
 512    while parser.check('import'):
 513        ref = parser[1]
 514
 515        if (ref == 'HEAD'):
 516            export_head(repo)
 517        elif ref.startswith('refs/heads/branches/'):
 518            branch = ref[len('refs/heads/branches/'):]
 519            export_branch(repo, branch)
 520        elif ref.startswith('refs/heads/'):
 521            bmark = ref[len('refs/heads/'):]
 522            export_bookmark(repo, bmark)
 523        elif ref.startswith('refs/tags/'):
 524            tag = ref[len('refs/tags/'):]
 525            export_tag(repo, tag)
 526
 527        parser.next()
 528
 529    encoding.encoding = tmp
 530
 531    print 'done'
 532
 533def parse_blob(parser):
 534    global blob_marks
 535
 536    parser.next()
 537    mark = parser.get_mark()
 538    parser.next()
 539    data = parser.get_data()
 540    blob_marks[mark] = data
 541    parser.next()
 542
 543def get_merge_files(repo, p1, p2, files):
 544    for e in repo[p1].files():
 545        if e not in files:
 546            if e not in repo[p1].manifest():
 547                continue
 548            f = { 'ctx' : repo[p1][e] }
 549            files[e] = f
 550
 551def parse_commit(parser):
 552    global marks, blob_marks, parsed_refs
 553    global mode
 554
 555    from_mark = merge_mark = None
 556
 557    ref = parser[1]
 558    parser.next()
 559
 560    commit_mark = parser.get_mark()
 561    parser.next()
 562    author = parser.get_author()
 563    parser.next()
 564    committer = parser.get_author()
 565    parser.next()
 566    data = parser.get_data()
 567    parser.next()
 568    if parser.check('from'):
 569        from_mark = parser.get_mark()
 570        parser.next()
 571    if parser.check('merge'):
 572        merge_mark = parser.get_mark()
 573        parser.next()
 574        if parser.check('merge'):
 575            die('octopus merges are not supported yet')
 576
 577    files = {}
 578
 579    for line in parser:
 580        if parser.check('M'):
 581            t, m, mark_ref, path = line.split(' ', 3)
 582            mark = int(mark_ref[1:])
 583            f = { 'mode' : hgmode(m), 'data' : blob_marks[mark] }
 584        elif parser.check('D'):
 585            t, path = line.split(' ', 1)
 586            f = { 'deleted' : True }
 587        else:
 588            die('Unknown file command: %s' % line)
 589        files[path] = f
 590
 591    def getfilectx(repo, memctx, f):
 592        of = files[f]
 593        if 'deleted' in of:
 594            raise IOError
 595        if 'ctx' in of:
 596            return of['ctx']
 597        is_exec = of['mode'] == 'x'
 598        is_link = of['mode'] == 'l'
 599        rename = of.get('rename', None)
 600        return context.memfilectx(f, of['data'],
 601                is_link, is_exec, rename)
 602
 603    repo = parser.repo
 604
 605    user, date, tz = author
 606    extra = {}
 607
 608    if committer != author:
 609        extra['committer'] = "%s %u %u" % committer
 610
 611    if from_mark:
 612        p1 = repo.changelog.node(mark_to_rev(from_mark))
 613    else:
 614        p1 = '\0' * 20
 615
 616    if merge_mark:
 617        p2 = repo.changelog.node(mark_to_rev(merge_mark))
 618    else:
 619        p2 = '\0' * 20
 620
 621    #
 622    # If files changed from any of the parents, hg wants to know, but in git if
 623    # nothing changed from the first parent, nothing changed.
 624    #
 625    if merge_mark:
 626        get_merge_files(repo, p1, p2, files)
 627
 628    # Check if the ref is supposed to be a named branch
 629    if ref.startswith('refs/heads/branches/'):
 630        extra['branch'] = ref[len('refs/heads/branches/'):]
 631
 632    if mode == 'hg':
 633        i = data.find('\n--HG--\n')
 634        if i >= 0:
 635            tmp = data[i + len('\n--HG--\n'):].strip()
 636            for k, v in [e.split(' : ', 1) for e in tmp.split('\n')]:
 637                if k == 'rename':
 638                    old, new = v.split(' => ', 1)
 639                    files[new]['rename'] = old
 640                elif k == 'branch':
 641                    extra[k] = v
 642                elif k == 'extra':
 643                    ek, ev = v.split(' : ', 1)
 644                    extra[ek] = urllib.unquote(ev)
 645            data = data[:i]
 646
 647    ctx = context.memctx(repo, (p1, p2), data,
 648            files.keys(), getfilectx,
 649            user, (date, tz), extra)
 650
 651    tmp = encoding.encoding
 652    encoding.encoding = 'utf-8'
 653
 654    node = repo.commitctx(ctx)
 655
 656    encoding.encoding = tmp
 657
 658    rev = repo[node].rev()
 659
 660    parsed_refs[ref] = node
 661    marks.new_mark(rev, commit_mark)
 662
 663def parse_reset(parser):
 664    global parsed_refs
 665
 666    ref = parser[1]
 667    parser.next()
 668    # ugh
 669    if parser.check('commit'):
 670        parse_commit(parser)
 671        return
 672    if not parser.check('from'):
 673        return
 674    from_mark = parser.get_mark()
 675    parser.next()
 676
 677    node = parser.repo.changelog.node(mark_to_rev(from_mark))
 678    parsed_refs[ref] = node
 679
 680def parse_tag(parser):
 681    name = parser[1]
 682    parser.next()
 683    from_mark = parser.get_mark()
 684    parser.next()
 685    tagger = parser.get_author()
 686    parser.next()
 687    data = parser.get_data()
 688    parser.next()
 689
 690    # nothing to do
 691
 692def do_export(parser):
 693    global parsed_refs, bmarks, peer
 694
 695    p_bmarks = []
 696
 697    parser.next()
 698
 699    for line in parser.each_block('done'):
 700        if parser.check('blob'):
 701            parse_blob(parser)
 702        elif parser.check('commit'):
 703            parse_commit(parser)
 704        elif parser.check('reset'):
 705            parse_reset(parser)
 706        elif parser.check('tag'):
 707            parse_tag(parser)
 708        elif parser.check('feature'):
 709            pass
 710        else:
 711            die('unhandled export command: %s' % line)
 712
 713    for ref, node in parsed_refs.iteritems():
 714        if ref.startswith('refs/heads/branches'):
 715            print "ok %s" % ref
 716        elif ref.startswith('refs/heads/'):
 717            bmark = ref[len('refs/heads/'):]
 718            p_bmarks.append((bmark, node))
 719            continue
 720        elif ref.startswith('refs/tags/'):
 721            tag = ref[len('refs/tags/'):]
 722            if mode == 'git':
 723                msg = 'Added tag %s for changeset %s' % (tag, hghex(node[:6]));
 724                parser.repo.tag([tag], node, msg, False, None, {})
 725            else:
 726                parser.repo.tag([tag], node, None, True, None, {})
 727            print "ok %s" % ref
 728        else:
 729            # transport-helper/fast-export bugs
 730            continue
 731
 732    if peer:
 733        parser.repo.push(peer, force=False)
 734
 735    # handle bookmarks
 736    for bmark, node in p_bmarks:
 737        ref = 'refs/heads/' + bmark
 738        new = hghex(node)
 739
 740        if bmark in bmarks:
 741            old = bmarks[bmark].hex()
 742        else:
 743            old = ''
 744
 745        if bmark == 'master' and 'master' not in parser.repo._bookmarks:
 746            # fake bookmark
 747            pass
 748        elif bookmarks.pushbookmark(parser.repo, bmark, old, new):
 749            # updated locally
 750            pass
 751        else:
 752            print "error %s" % ref
 753            continue
 754
 755        if peer:
 756            if not peer.pushkey('bookmarks', bmark, old, new):
 757                print "error %s" % ref
 758                continue
 759
 760        print "ok %s" % ref
 761
 762    print
 763
 764def fix_path(alias, repo, orig_url):
 765    repo_url = util.url(repo.url())
 766    url = util.url(orig_url)
 767    if str(url) == str(repo_url):
 768        return
 769    cmd = ['git', 'config', 'remote.%s.url' % alias, "hg::%s" % repo_url]
 770    subprocess.call(cmd)
 771
 772def main(args):
 773    global prefix, dirname, branches, bmarks
 774    global marks, blob_marks, parsed_refs
 775    global peer, mode, bad_mail, bad_name
 776    global track_branches
 777
 778    alias = args[1]
 779    url = args[2]
 780    peer = None
 781
 782    hg_git_compat = False
 783    track_branches = True
 784    try:
 785        if get_config('remote-hg.hg-git-compat') == 'true\n':
 786            hg_git_compat = True
 787            track_branches = False
 788        if get_config('remote-hg.track-branches') == 'false\n':
 789            track_branches = False
 790    except subprocess.CalledProcessError:
 791        pass
 792
 793    if hg_git_compat:
 794        mode = 'hg'
 795        bad_mail = 'none@none'
 796        bad_name = ''
 797    else:
 798        mode = 'git'
 799        bad_mail = 'unknown'
 800        bad_name = 'Unknown'
 801
 802    if alias[4:] == url:
 803        is_tmp = True
 804        alias = util.sha1(alias).hexdigest()
 805    else:
 806        is_tmp = False
 807
 808    gitdir = os.environ['GIT_DIR']
 809    dirname = os.path.join(gitdir, 'hg', alias)
 810    branches = {}
 811    bmarks = {}
 812    blob_marks = {}
 813    parsed_refs = {}
 814
 815    repo = get_repo(url, alias)
 816    prefix = 'refs/hg/%s' % alias
 817
 818    if not is_tmp:
 819        fix_path(alias, peer or repo, url)
 820
 821    if not os.path.exists(dirname):
 822        os.makedirs(dirname)
 823
 824    marks_path = os.path.join(dirname, 'marks-hg')
 825    marks = Marks(marks_path)
 826
 827    parser = Parser(repo)
 828    for line in parser:
 829        if parser.check('capabilities'):
 830            do_capabilities(parser)
 831        elif parser.check('list'):
 832            do_list(parser)
 833        elif parser.check('import'):
 834            do_import(parser)
 835        elif parser.check('export'):
 836            do_export(parser)
 837        else:
 838            die('unhandled command: %s' % line)
 839        sys.stdout.flush()
 840
 841    if not is_tmp:
 842        marks.store()
 843    else:
 844        shutil.rmtree(dirname)
 845
 846sys.exit(main(sys.argv))