Andrew's git - gitweb.git/blob

ff8972579ecbd60eb42307c0ae093c1ba52d905b
   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 $PATH.
   9# Then you can clone with:
  10# git clone hg::/path/to/mercurial/repo/
  11
  12from mercurial import hg, ui, bookmarks, context, util, encoding, node
  13
  14import re
  15import sys
  16import os
  17import json
  18import shutil
  19import subprocess
  20import urllib
  21
  22#
  23# If you want to switch to hg-git compatibility mode:
  24# git config --global remote-hg.hg-git-compat true
  25#
  26# If you are not in hg-git-compat mode and want to disable the tracking of
  27# named branches:
  28# git config --global remote-hg.track-branches false
  29#
  30# If you don't want to force pushes (and thus risk creating new remote heads):
  31# git config --global remote-hg.force-push false
  32#
  33# git:
  34# Sensible defaults for git.
  35# hg bookmarks are exported as git branches, hg branches are prefixed
  36# with 'branches/', HEAD is a special case.
  37#
  38# hg:
  39# Emulate hg-git.
  40# Only hg bookmarks are exported as git branches.
  41# Commits are modified to preserve hg information and allow bidirectionality.
  42#
  43
  44NAME_RE = re.compile('^([^<>]+)')
  45AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  46AUTHOR_HG_RE = re.compile('^(.*?) ?<(.*?)(?:>(.+)?)?$')
  47RAW_AUTHOR_RE = re.compile('^(\w+) (?:(.+)? )?<(.*)> (\d+) ([+-]\d+)')
  48
  49def die(msg, *args):
  50    sys.stderr.write('ERROR: %s\n' % (msg % args))
  51    sys.exit(1)
  52
  53def warn(msg, *args):
  54    sys.stderr.write('WARNING: %s\n' % (msg % args))
  55
  56def gitmode(flags):
  57    return 'l' in flags and '120000' or 'x' in flags and '100755' or '100644'
  58
  59def gittz(tz):
  60    return '%+03d%02d' % (-tz / 3600, -tz % 3600 / 60)
  61
  62def hgmode(mode):
  63    m = { '100755': 'x', '120000': 'l' }
  64    return m.get(mode, '')
  65
  66def hghex(node):
  67    return hg.node.hex(node)
  68
  69def get_config(config):
  70    cmd = ['git', 'config', '--get', config]
  71    process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  72    output, _ = process.communicate()
  73    return output
  74
  75class Marks:
  76
  77    def __init__(self, path):
  78        self.path = path
  79        self.tips = {}
  80        self.marks = {}
  81        self.rev_marks = {}
  82        self.last_mark = 0
  83
  84        self.load()
  85
  86    def load(self):
  87        if not os.path.exists(self.path):
  88            return
  89
  90        tmp = json.load(open(self.path))
  91
  92        self.tips = tmp['tips']
  93        self.marks = tmp['marks']
  94        self.last_mark = tmp['last-mark']
  95
  96        for rev, mark in self.marks.iteritems():
  97            self.rev_marks[mark] = int(rev)
  98
  99    def dict(self):
 100        return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
 101
 102    def store(self):
 103        json.dump(self.dict(), open(self.path, 'w'))
 104
 105    def __str__(self):
 106        return str(self.dict())
 107
 108    def from_rev(self, rev):
 109        return self.marks[str(rev)]
 110
 111    def to_rev(self, mark):
 112        return self.rev_marks[mark]
 113
 114    def get_mark(self, rev):
 115        self.last_mark += 1
 116        self.marks[str(rev)] = self.last_mark
 117        return self.last_mark
 118
 119    def new_mark(self, rev, mark):
 120        self.marks[str(rev)] = mark
 121        self.rev_marks[mark] = rev
 122        self.last_mark = mark
 123
 124    def is_marked(self, rev):
 125        return self.marks.has_key(str(rev))
 126
 127    def get_tip(self, branch):
 128        return self.tips.get(branch, 0)
 129
 130    def set_tip(self, branch, tip):
 131        self.tips[branch] = tip
 132
 133class Parser:
 134
 135    def __init__(self, repo):
 136        self.repo = repo
 137        self.line = self.get_line()
 138
 139    def get_line(self):
 140        return sys.stdin.readline().strip()
 141
 142    def __getitem__(self, i):
 143        return self.line.split()[i]
 144
 145    def check(self, word):
 146        return self.line.startswith(word)
 147
 148    def each_block(self, separator):
 149        while self.line != separator:
 150            yield self.line
 151            self.line = self.get_line()
 152
 153    def __iter__(self):
 154        return self.each_block('')
 155
 156    def next(self):
 157        self.line = self.get_line()
 158        if self.line == 'done':
 159            self.line = None
 160
 161    def get_mark(self):
 162        i = self.line.index(':') + 1
 163        return int(self.line[i:])
 164
 165    def get_data(self):
 166        if not self.check('data'):
 167            return None
 168        i = self.line.index(' ') + 1
 169        size = int(self.line[i:])
 170        return sys.stdin.read(size)
 171
 172    def get_author(self):
 173        global bad_mail
 174
 175        ex = None
 176        m = RAW_AUTHOR_RE.match(self.line)
 177        if not m:
 178            return None
 179        _, name, email, date, tz = m.groups()
 180        if name and 'ext:' in name:
 181            m = re.match('^(.+?) ext:\((.+)\)$', name)
 182            if m:
 183                name = m.group(1)
 184                ex = urllib.unquote(m.group(2))
 185
 186        if email != bad_mail:
 187            if name:
 188                user = '%s <%s>' % (name, email)
 189            else:
 190                user = '<%s>' % (email)
 191        else:
 192            user = name
 193
 194        if ex:
 195            user += ex
 196
 197        tz = int(tz)
 198        tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 199        return (user, int(date), -tz)
 200
 201def export_file(fc):
 202    d = fc.data()
 203    print "M %s inline %s" % (gitmode(fc.flags()), fc.path())
 204    print "data %d" % len(d)
 205    print d
 206
 207def get_filechanges(repo, ctx, parent):
 208    modified = set()
 209    added = set()
 210    removed = set()
 211
 212    cur = ctx.manifest()
 213    prev = repo[parent].manifest().copy()
 214
 215    for fn in cur:
 216        if fn in prev:
 217            if (cur.flags(fn) != prev.flags(fn) or cur[fn] != prev[fn]):
 218                modified.add(fn)
 219            del prev[fn]
 220        else:
 221            added.add(fn)
 222    removed |= set(prev.keys())
 223
 224    return added | modified, removed
 225
 226def fixup_user_git(user):
 227    name = mail = None
 228    user = user.replace('"', '')
 229    m = AUTHOR_RE.match(user)
 230    if m:
 231        name = m.group(1)
 232        mail = m.group(2).strip()
 233    else:
 234        m = NAME_RE.match(user)
 235        if m:
 236            name = m.group(1).strip()
 237    return (name, mail)
 238
 239def fixup_user_hg(user):
 240    def sanitize(name):
 241        # stole this from hg-git
 242        return re.sub('[<>\n]', '?', name.lstrip('< ').rstrip('> '))
 243
 244    m = AUTHOR_HG_RE.match(user)
 245    if m:
 246        name = sanitize(m.group(1))
 247        mail = sanitize(m.group(2))
 248        ex = m.group(3)
 249        if ex:
 250            name += ' ext:(' + urllib.quote(ex) + ')'
 251    else:
 252        name = sanitize(user)
 253        if '@' in user:
 254            mail = name
 255        else:
 256            mail = None
 257
 258    return (name, mail)
 259
 260def fixup_user(user):
 261    global mode, bad_mail
 262
 263    if mode == 'git':
 264        name, mail = fixup_user_git(user)
 265    else:
 266        name, mail = fixup_user_hg(user)
 267
 268    if not name:
 269        name = bad_name
 270    if not mail:
 271        mail = bad_mail
 272
 273    return '%s <%s>' % (name, mail)
 274
 275def get_repo(url, alias):
 276    global dirname, peer
 277
 278    myui = ui.ui()
 279    myui.setconfig('ui', 'interactive', 'off')
 280    myui.fout = sys.stderr
 281
 282    if hg.islocal(url):
 283        repo = hg.repository(myui, url)
 284    else:
 285        local_path = os.path.join(dirname, 'clone')
 286        if not os.path.exists(local_path):
 287            peer, dstpeer = hg.clone(myui, {}, url, local_path, update=False, pull=True)
 288            repo = dstpeer.local()
 289        else:
 290            repo = hg.repository(myui, local_path)
 291            peer = hg.peer(myui, {}, url)
 292            repo.pull(peer, heads=None, force=True)
 293
 294    return repo
 295
 296def rev_to_mark(rev):
 297    global marks
 298    return marks.from_rev(rev)
 299
 300def mark_to_rev(mark):
 301    global marks
 302    return marks.to_rev(mark)
 303
 304def export_ref(repo, name, kind, head):
 305    global prefix, marks, mode
 306
 307    ename = '%s/%s' % (kind, name)
 308    tip = marks.get_tip(ename)
 309
 310    # mercurial takes too much time checking this
 311    if tip and tip == head.rev():
 312        # nothing to do
 313        return
 314    revs = xrange(tip, head.rev() + 1)
 315    count = 0
 316
 317    revs = [rev for rev in revs if not marks.is_marked(rev)]
 318
 319    for rev in revs:
 320
 321        c = repo[rev]
 322        (manifest, user, (time, tz), files, desc, extra) = repo.changelog.read(c.node())
 323        rev_branch = extra['branch']
 324
 325        author = "%s %d %s" % (fixup_user(user), time, gittz(tz))
 326        if 'committer' in extra:
 327            user, time, tz = extra['committer'].rsplit(' ', 2)
 328            committer = "%s %s %s" % (user, time, gittz(int(tz)))
 329        else:
 330            committer = author
 331
 332        parents = [p for p in repo.changelog.parentrevs(rev) if p >= 0]
 333
 334        if len(parents) == 0:
 335            modified = c.manifest().keys()
 336            removed = []
 337        else:
 338            modified, removed = get_filechanges(repo, c, parents[0])
 339
 340        if mode == 'hg':
 341            extra_msg = ''
 342
 343            if rev_branch != 'default':
 344                extra_msg += 'branch : %s\n' % rev_branch
 345
 346            renames = []
 347            for f in c.files():
 348                if f not in c.manifest():
 349                    continue
 350                rename = c.filectx(f).renamed()
 351                if rename:
 352                    renames.append((rename[0], f))
 353
 354            for e in renames:
 355                extra_msg += "rename : %s => %s\n" % e
 356
 357            for key, value in extra.iteritems():
 358                if key in ('author', 'committer', 'encoding', 'message', 'branch', 'hg-git'):
 359                    continue
 360                else:
 361                    extra_msg += "extra : %s : %s\n" % (key, urllib.quote(value))
 362
 363            desc += '\n'
 364            if extra_msg:
 365                desc += '\n--HG--\n' + extra_msg
 366
 367        if len(parents) == 0 and rev:
 368            print 'reset %s/%s' % (prefix, ename)
 369
 370        print "commit %s/%s" % (prefix, ename)
 371        print "mark :%d" % (marks.get_mark(rev))
 372        print "author %s" % (author)
 373        print "committer %s" % (committer)
 374        print "data %d" % (len(desc))
 375        print desc
 376
 377        if len(parents) > 0:
 378            print "from :%s" % (rev_to_mark(parents[0]))
 379            if len(parents) > 1:
 380                print "merge :%s" % (rev_to_mark(parents[1]))
 381
 382        for f in modified:
 383            export_file(c.filectx(f))
 384        for f in removed:
 385            print "D %s" % (f)
 386        print
 387
 388        count += 1
 389        if (count % 100 == 0):
 390            print "progress revision %d '%s' (%d/%d)" % (rev, name, count, len(revs))
 391            print "#############################################################"
 392
 393    # make sure the ref is updated
 394    print "reset %s/%s" % (prefix, ename)
 395    print "from :%u" % rev_to_mark(rev)
 396    print
 397
 398    marks.set_tip(ename, rev)
 399
 400def export_tag(repo, tag):
 401    export_ref(repo, tag, 'tags', repo[tag])
 402
 403def export_bookmark(repo, bmark):
 404    head = bmarks[bmark]
 405    export_ref(repo, bmark, 'bookmarks', head)
 406
 407def export_branch(repo, branch):
 408    tip = get_branch_tip(repo, branch)
 409    head = repo[tip]
 410    export_ref(repo, branch, 'branches', head)
 411
 412def export_head(repo):
 413    global g_head
 414    export_ref(repo, g_head[0], 'bookmarks', g_head[1])
 415
 416def do_capabilities(parser):
 417    global prefix, dirname
 418
 419    print "import"
 420    print "export"
 421    print "refspec refs/heads/branches/*:%s/branches/*" % prefix
 422    print "refspec refs/heads/*:%s/bookmarks/*" % prefix
 423    print "refspec refs/tags/*:%s/tags/*" % prefix
 424
 425    path = os.path.join(dirname, 'marks-git')
 426
 427    if os.path.exists(path):
 428        print "*import-marks %s" % path
 429    print "*export-marks %s" % path
 430
 431    print
 432
 433def get_branch_tip(repo, branch):
 434    global branches
 435
 436    heads = branches.get(branch, None)
 437    if not heads:
 438        return None
 439
 440    # verify there's only one head
 441    if (len(heads) > 1):
 442        warn("Branch '%s' has more than one head, consider merging" % branch)
 443        # older versions of mercurial don't have this
 444        if hasattr(repo, "branchtip"):
 445            return repo.branchtip(branch)
 446
 447    return heads[0]
 448
 449def list_head(repo, cur):
 450    global g_head, bmarks
 451
 452    head = bookmarks.readcurrent(repo)
 453    if head:
 454        node = repo[head]
 455    else:
 456        # fake bookmark from current branch
 457        head = cur
 458        node = repo['.']
 459        if not node:
 460            node = repo['tip']
 461        if not node:
 462            return
 463        if head == 'default':
 464            head = 'master'
 465        bmarks[head] = node
 466
 467    print "@refs/heads/%s HEAD" % head
 468    g_head = (head, node)
 469
 470def do_list(parser):
 471    global branches, bmarks, mode, track_branches
 472
 473    repo = parser.repo
 474    for bmark, node in bookmarks.listbookmarks(repo).iteritems():
 475        bmarks[bmark] = repo[node]
 476
 477    cur = repo.dirstate.branch()
 478
 479    list_head(repo, cur)
 480
 481    if track_branches:
 482        for branch in repo.branchmap():
 483            heads = repo.branchheads(branch)
 484            if len(heads):
 485                branches[branch] = heads
 486
 487        for branch in branches:
 488            print "? refs/heads/branches/%s" % branch
 489
 490    for bmark in bmarks:
 491        print "? refs/heads/%s" % bmark
 492
 493    for tag, node in repo.tagslist():
 494        if tag == 'tip':
 495            continue
 496        print "? refs/tags/%s" % tag
 497
 498    print
 499
 500def do_import(parser):
 501    repo = parser.repo
 502
 503    path = os.path.join(dirname, 'marks-git')
 504
 505    print "feature done"
 506    if os.path.exists(path):
 507        print "feature import-marks=%s" % path
 508    print "feature export-marks=%s" % path
 509    sys.stdout.flush()
 510
 511    tmp = encoding.encoding
 512    encoding.encoding = 'utf-8'
 513
 514    # lets get all the import lines
 515    while parser.check('import'):
 516        ref = parser[1]
 517
 518        if (ref == 'HEAD'):
 519            export_head(repo)
 520        elif ref.startswith('refs/heads/branches/'):
 521            branch = ref[len('refs/heads/branches/'):]
 522            export_branch(repo, branch)
 523        elif ref.startswith('refs/heads/'):
 524            bmark = ref[len('refs/heads/'):]
 525            export_bookmark(repo, bmark)
 526        elif ref.startswith('refs/tags/'):
 527            tag = ref[len('refs/tags/'):]
 528            export_tag(repo, tag)
 529
 530        parser.next()
 531
 532    encoding.encoding = tmp
 533
 534    print 'done'
 535
 536def parse_blob(parser):
 537    global blob_marks
 538
 539    parser.next()
 540    mark = parser.get_mark()
 541    parser.next()
 542    data = parser.get_data()
 543    blob_marks[mark] = data
 544    parser.next()
 545
 546def get_merge_files(repo, p1, p2, files):
 547    for e in repo[p1].files():
 548        if e not in files:
 549            if e not in repo[p1].manifest():
 550                continue
 551            f = { 'ctx' : repo[p1][e] }
 552            files[e] = f
 553
 554def parse_commit(parser):
 555    global marks, blob_marks, parsed_refs
 556    global mode
 557
 558    from_mark = merge_mark = None
 559
 560    ref = parser[1]
 561    parser.next()
 562
 563    commit_mark = parser.get_mark()
 564    parser.next()
 565    author = parser.get_author()
 566    parser.next()
 567    committer = parser.get_author()
 568    parser.next()
 569    data = parser.get_data()
 570    parser.next()
 571    if parser.check('from'):
 572        from_mark = parser.get_mark()
 573        parser.next()
 574    if parser.check('merge'):
 575        merge_mark = parser.get_mark()
 576        parser.next()
 577        if parser.check('merge'):
 578            die('octopus merges are not supported yet')
 579
 580    files = {}
 581
 582    for line in parser:
 583        if parser.check('M'):
 584            t, m, mark_ref, path = line.split(' ', 3)
 585            mark = int(mark_ref[1:])
 586            f = { 'mode' : hgmode(m), 'data' : blob_marks[mark] }
 587        elif parser.check('D'):
 588            t, path = line.split(' ', 1)
 589            f = { 'deleted' : True }
 590        else:
 591            die('Unknown file command: %s' % line)
 592        files[path] = f
 593
 594    def getfilectx(repo, memctx, f):
 595        of = files[f]
 596        if 'deleted' in of:
 597            raise IOError
 598        if 'ctx' in of:
 599            return of['ctx']
 600        is_exec = of['mode'] == 'x'
 601        is_link = of['mode'] == 'l'
 602        rename = of.get('rename', None)
 603        return context.memfilectx(f, of['data'],
 604                is_link, is_exec, rename)
 605
 606    repo = parser.repo
 607
 608    user, date, tz = author
 609    extra = {}
 610
 611    if committer != author:
 612        extra['committer'] = "%s %u %u" % committer
 613
 614    if from_mark:
 615        p1 = repo.changelog.node(mark_to_rev(from_mark))
 616    else:
 617        p1 = '\0' * 20
 618
 619    if merge_mark:
 620        p2 = repo.changelog.node(mark_to_rev(merge_mark))
 621    else:
 622        p2 = '\0' * 20
 623
 624    #
 625    # If files changed from any of the parents, hg wants to know, but in git if
 626    # nothing changed from the first parent, nothing changed.
 627    #
 628    if merge_mark:
 629        get_merge_files(repo, p1, p2, files)
 630
 631    # Check if the ref is supposed to be a named branch
 632    if ref.startswith('refs/heads/branches/'):
 633        extra['branch'] = ref[len('refs/heads/branches/'):]
 634
 635    if mode == 'hg':
 636        i = data.find('\n--HG--\n')
 637        if i >= 0:
 638            tmp = data[i + len('\n--HG--\n'):].strip()
 639            for k, v in [e.split(' : ', 1) for e in tmp.split('\n')]:
 640                if k == 'rename':
 641                    old, new = v.split(' => ', 1)
 642                    files[new]['rename'] = old
 643                elif k == 'branch':
 644                    extra[k] = v
 645                elif k == 'extra':
 646                    ek, ev = v.split(' : ', 1)
 647                    extra[ek] = urllib.unquote(ev)
 648            data = data[:i]
 649
 650    ctx = context.memctx(repo, (p1, p2), data,
 651            files.keys(), getfilectx,
 652            user, (date, tz), extra)
 653
 654    tmp = encoding.encoding
 655    encoding.encoding = 'utf-8'
 656
 657    node = repo.commitctx(ctx)
 658
 659    encoding.encoding = tmp
 660
 661    rev = repo[node].rev()
 662
 663    parsed_refs[ref] = node
 664    marks.new_mark(rev, commit_mark)
 665
 666def parse_reset(parser):
 667    global parsed_refs
 668
 669    ref = parser[1]
 670    parser.next()
 671    # ugh
 672    if parser.check('commit'):
 673        parse_commit(parser)
 674        return
 675    if not parser.check('from'):
 676        return
 677    from_mark = parser.get_mark()
 678    parser.next()
 679
 680    node = parser.repo.changelog.node(mark_to_rev(from_mark))
 681    parsed_refs[ref] = node
 682
 683def parse_tag(parser):
 684    name = parser[1]
 685    parser.next()
 686    from_mark = parser.get_mark()
 687    parser.next()
 688    tagger = parser.get_author()
 689    parser.next()
 690    data = parser.get_data()
 691    parser.next()
 692
 693    # nothing to do
 694
 695def do_export(parser):
 696    global parsed_refs, bmarks, peer
 697
 698    p_bmarks = []
 699
 700    parser.next()
 701
 702    for line in parser.each_block('done'):
 703        if parser.check('blob'):
 704            parse_blob(parser)
 705        elif parser.check('commit'):
 706            parse_commit(parser)
 707        elif parser.check('reset'):
 708            parse_reset(parser)
 709        elif parser.check('tag'):
 710            parse_tag(parser)
 711        elif parser.check('feature'):
 712            pass
 713        else:
 714            die('unhandled export command: %s' % line)
 715
 716    for ref, node in parsed_refs.iteritems():
 717        if ref.startswith('refs/heads/branches'):
 718            print "ok %s" % ref
 719        elif ref.startswith('refs/heads/'):
 720            bmark = ref[len('refs/heads/'):]
 721            p_bmarks.append((bmark, node))
 722            continue
 723        elif ref.startswith('refs/tags/'):
 724            tag = ref[len('refs/tags/'):]
 725            if mode == 'git':
 726                msg = 'Added tag %s for changeset %s' % (tag, hghex(node[:6]));
 727                parser.repo.tag([tag], node, msg, False, None, {})
 728            else:
 729                parser.repo.tag([tag], node, None, True, None, {})
 730            print "ok %s" % ref
 731        else:
 732            # transport-helper/fast-export bugs
 733            continue
 734
 735    if peer:
 736        parser.repo.push(peer, force=force_push)
 737
 738    # handle bookmarks
 739    for bmark, node in p_bmarks:
 740        ref = 'refs/heads/' + bmark
 741        new = hghex(node)
 742
 743        if bmark in bmarks:
 744            old = bmarks[bmark].hex()
 745        else:
 746            old = ''
 747
 748        if bmark == 'master' and 'master' not in parser.repo._bookmarks:
 749            # fake bookmark
 750            pass
 751        elif bookmarks.pushbookmark(parser.repo, bmark, old, new):
 752            # updated locally
 753            pass
 754        else:
 755            print "error %s" % ref
 756            continue
 757
 758        if peer:
 759            if not peer.pushkey('bookmarks', bmark, old, new):
 760                print "error %s" % ref
 761                continue
 762
 763        print "ok %s" % ref
 764
 765    print
 766
 767def fix_path(alias, repo, orig_url):
 768    repo_url = util.url(repo.url())
 769    url = util.url(orig_url)
 770    if str(url) == str(repo_url):
 771        return
 772    cmd = ['git', 'config', 'remote.%s.url' % alias, "hg::%s" % repo_url]
 773    subprocess.call(cmd)
 774
 775def main(args):
 776    global prefix, dirname, branches, bmarks
 777    global marks, blob_marks, parsed_refs
 778    global peer, mode, bad_mail, bad_name
 779    global track_branches, force_push
 780
 781    alias = args[1]
 782    url = args[2]
 783    peer = None
 784
 785    hg_git_compat = False
 786    track_branches = True
 787    force_push = True
 788
 789    try:
 790        if get_config('remote-hg.hg-git-compat') == 'true\n':
 791            hg_git_compat = True
 792            track_branches = False
 793        if get_config('remote-hg.track-branches') == 'false\n':
 794            track_branches = False
 795        if get_config('remote-hg.force-push') == 'false\n':
 796            force_push = False
 797    except subprocess.CalledProcessError:
 798        pass
 799
 800    if hg_git_compat:
 801        mode = 'hg'
 802        bad_mail = 'none@none'
 803        bad_name = ''
 804    else:
 805        mode = 'git'
 806        bad_mail = 'unknown'
 807        bad_name = 'Unknown'
 808
 809    if alias[4:] == url:
 810        is_tmp = True
 811        alias = util.sha1(alias).hexdigest()
 812    else:
 813        is_tmp = False
 814
 815    gitdir = os.environ['GIT_DIR']
 816    dirname = os.path.join(gitdir, 'hg', alias)
 817    branches = {}
 818    bmarks = {}
 819    blob_marks = {}
 820    parsed_refs = {}
 821
 822    repo = get_repo(url, alias)
 823    prefix = 'refs/hg/%s' % alias
 824
 825    if not is_tmp:
 826        fix_path(alias, peer or repo, url)
 827
 828    if not os.path.exists(dirname):
 829        os.makedirs(dirname)
 830
 831    marks_path = os.path.join(dirname, 'marks-hg')
 832    marks = Marks(marks_path)
 833
 834    parser = Parser(repo)
 835    for line in parser:
 836        if parser.check('capabilities'):
 837            do_capabilities(parser)
 838        elif parser.check('list'):
 839            do_list(parser)
 840        elif parser.check('import'):
 841            do_import(parser)
 842        elif parser.check('export'):
 843            do_export(parser)
 844        else:
 845            die('unhandled command: %s' % line)
 846        sys.stdout.flush()
 847
 848    if not is_tmp:
 849        marks.store()
 850    else:
 851        shutil.rmtree(dirname)
 852
 853sys.exit(main(sys.argv))