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 $PATH.
   9# Then you can clone with:
  10# git clone hg::/path/to/mercurial/repo/
  11#
  12# For remote repositories a local clone is stored in
  13# "$GIT_DIR/hg/origin/clone/.hg/".
  14
  15from mercurial import hg, ui, bookmarks, context, util, encoding, node, error
  16
  17import re
  18import sys
  19import os
  20import json
  21import shutil
  22import subprocess
  23import urllib
  24import atexit
  25
  26#
  27# If you want to switch to hg-git compatibility mode:
  28# git config --global remote-hg.hg-git-compat true
  29#
  30# If you are not in hg-git-compat mode and want to disable the tracking of
  31# named branches:
  32# git config --global remote-hg.track-branches false
  33#
  34# If you don't want to force pushes (and thus risk creating new remote heads):
  35# git config --global remote-hg.force-push false
  36#
  37# If you want the equivalent of hg's clone/pull--insecure option:
  38# git config remote-hg.insecure true
  39#
  40# git:
  41# Sensible defaults for git.
  42# hg bookmarks are exported as git branches, hg branches are prefixed
  43# with 'branches/', HEAD is a special case.
  44#
  45# hg:
  46# Emulate hg-git.
  47# Only hg bookmarks are exported as git branches.
  48# Commits are modified to preserve hg information and allow bidirectionality.
  49#
  50
  51NAME_RE = re.compile('^([^<>]+)')
  52AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  53AUTHOR_HG_RE = re.compile('^(.*?) ?<(.*?)(?:>(.+)?)?$')
  54RAW_AUTHOR_RE = re.compile('^(\w+) (?:(.+)? )?<(.*)> (\d+) ([+-]\d+)')
  55
  56def die(msg, *args):
  57    sys.stderr.write('ERROR: %s\n' % (msg % args))
  58    sys.exit(1)
  59
  60def warn(msg, *args):
  61    sys.stderr.write('WARNING: %s\n' % (msg % args))
  62
  63def gitmode(flags):
  64    return 'l' in flags and '120000' or 'x' in flags and '100755' or '100644'
  65
  66def gittz(tz):
  67    return '%+03d%02d' % (-tz / 3600, -tz % 3600 / 60)
  68
  69def hgmode(mode):
  70    m = { '100755': 'x', '120000': 'l' }
  71    return m.get(mode, '')
  72
  73def hghex(node):
  74    return hg.node.hex(node)
  75
  76def get_config(config):
  77    cmd = ['git', 'config', '--get', config]
  78    process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
  79    output, _ = process.communicate()
  80    return output
  81
  82class Marks:
  83
  84    def __init__(self, path):
  85        self.path = path
  86        self.tips = {}
  87        self.marks = {}
  88        self.rev_marks = {}
  89        self.last_mark = 0
  90
  91        self.load()
  92
  93    def load(self):
  94        if not os.path.exists(self.path):
  95            return
  96
  97        tmp = json.load(open(self.path))
  98
  99        self.tips = tmp['tips']
 100        self.marks = tmp['marks']
 101        self.last_mark = tmp['last-mark']
 102
 103        for rev, mark in self.marks.iteritems():
 104            self.rev_marks[mark] = int(rev)
 105
 106    def dict(self):
 107        return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
 108
 109    def store(self):
 110        json.dump(self.dict(), open(self.path, 'w'))
 111
 112    def __str__(self):
 113        return str(self.dict())
 114
 115    def from_rev(self, rev):
 116        return self.marks[str(rev)]
 117
 118    def to_rev(self, mark):
 119        return self.rev_marks[mark]
 120
 121    def get_mark(self, rev):
 122        self.last_mark += 1
 123        self.marks[str(rev)] = self.last_mark
 124        return self.last_mark
 125
 126    def new_mark(self, rev, mark):
 127        self.marks[str(rev)] = mark
 128        self.rev_marks[mark] = rev
 129        self.last_mark = mark
 130
 131    def is_marked(self, rev):
 132        return str(rev) in self.marks
 133
 134    def get_tip(self, branch):
 135        return self.tips.get(branch, 0)
 136
 137    def set_tip(self, branch, tip):
 138        self.tips[branch] = tip
 139
 140class Parser:
 141
 142    def __init__(self, repo):
 143        self.repo = repo
 144        self.line = self.get_line()
 145
 146    def get_line(self):
 147        return sys.stdin.readline().strip()
 148
 149    def __getitem__(self, i):
 150        return self.line.split()[i]
 151
 152    def check(self, word):
 153        return self.line.startswith(word)
 154
 155    def each_block(self, separator):
 156        while self.line != separator:
 157            yield self.line
 158            self.line = self.get_line()
 159
 160    def __iter__(self):
 161        return self.each_block('')
 162
 163    def next(self):
 164        self.line = self.get_line()
 165        if self.line == 'done':
 166            self.line = None
 167
 168    def get_mark(self):
 169        i = self.line.index(':') + 1
 170        return int(self.line[i:])
 171
 172    def get_data(self):
 173        if not self.check('data'):
 174            return None
 175        i = self.line.index(' ') + 1
 176        size = int(self.line[i:])
 177        return sys.stdin.read(size)
 178
 179    def get_author(self):
 180        global bad_mail
 181
 182        ex = None
 183        m = RAW_AUTHOR_RE.match(self.line)
 184        if not m:
 185            return None
 186        _, name, email, date, tz = m.groups()
 187        if name and 'ext:' in name:
 188            m = re.match('^(.+?) ext:\((.+)\)$', name)
 189            if m:
 190                name = m.group(1)
 191                ex = urllib.unquote(m.group(2))
 192
 193        if email != bad_mail:
 194            if name:
 195                user = '%s <%s>' % (name, email)
 196            else:
 197                user = '<%s>' % (email)
 198        else:
 199            user = name
 200
 201        if ex:
 202            user += ex
 203
 204        tz = int(tz)
 205        tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 206        return (user, int(date), -tz)
 207
 208def fix_file_path(path):
 209    if not os.path.isabs(path):
 210        return path
 211    return os.path.relpath(path, '/')
 212
 213def export_file(fc):
 214    d = fc.data()
 215    path = fix_file_path(fc.path())
 216    print "M %s inline %s" % (gitmode(fc.flags()), path)
 217    print "data %d" % len(d)
 218    print d
 219
 220def get_filechanges(repo, ctx, parent):
 221    modified = set()
 222    added = set()
 223    removed = set()
 224
 225    cur = ctx.manifest()
 226    prev = repo[parent].manifest().copy()
 227
 228    for fn in cur:
 229        if fn in prev:
 230            if (cur.flags(fn) != prev.flags(fn) or cur[fn] != prev[fn]):
 231                modified.add(fn)
 232            del prev[fn]
 233        else:
 234            added.add(fn)
 235    removed |= set(prev.keys())
 236
 237    return added | modified, removed
 238
 239def fixup_user_git(user):
 240    name = mail = None
 241    user = user.replace('"', '')
 242    m = AUTHOR_RE.match(user)
 243    if m:
 244        name = m.group(1)
 245        mail = m.group(2).strip()
 246    else:
 247        m = NAME_RE.match(user)
 248        if m:
 249            name = m.group(1).strip()
 250    return (name, mail)
 251
 252def fixup_user_hg(user):
 253    def sanitize(name):
 254        # stole this from hg-git
 255        return re.sub('[<>\n]', '?', name.lstrip('< ').rstrip('> '))
 256
 257    m = AUTHOR_HG_RE.match(user)
 258    if m:
 259        name = sanitize(m.group(1))
 260        mail = sanitize(m.group(2))
 261        ex = m.group(3)
 262        if ex:
 263            name += ' ext:(' + urllib.quote(ex) + ')'
 264    else:
 265        name = sanitize(user)
 266        if '@' in user:
 267            mail = name
 268        else:
 269            mail = None
 270
 271    return (name, mail)
 272
 273def fixup_user(user):
 274    global mode, bad_mail
 275
 276    if mode == 'git':
 277        name, mail = fixup_user_git(user)
 278    else:
 279        name, mail = fixup_user_hg(user)
 280
 281    if not name:
 282        name = bad_name
 283    if not mail:
 284        mail = bad_mail
 285
 286    return '%s <%s>' % (name, mail)
 287
 288def get_repo(url, alias):
 289    global dirname, peer
 290
 291    myui = ui.ui()
 292    myui.setconfig('ui', 'interactive', 'off')
 293    myui.fout = sys.stderr
 294
 295    try:
 296        if get_config('remote-hg.insecure') == 'true\n':
 297            myui.setconfig('web', 'cacerts', '')
 298    except subprocess.CalledProcessError:
 299        pass
 300
 301    if hg.islocal(url):
 302        repo = hg.repository(myui, url)
 303    else:
 304        local_path = os.path.join(dirname, 'clone')
 305        if not os.path.exists(local_path):
 306            try:
 307                peer, dstpeer = hg.clone(myui, {}, url, local_path, update=True, pull=True)
 308            except:
 309                die('Repository error')
 310            repo = dstpeer.local()
 311        else:
 312            repo = hg.repository(myui, local_path)
 313            try:
 314                peer = hg.peer(myui, {}, url)
 315            except:
 316                die('Repository error')
 317            repo.pull(peer, heads=None, force=True)
 318
 319    return repo
 320
 321def rev_to_mark(rev):
 322    global marks
 323    return marks.from_rev(rev)
 324
 325def mark_to_rev(mark):
 326    global marks
 327    return marks.to_rev(mark)
 328
 329def export_ref(repo, name, kind, head):
 330    global prefix, marks, mode
 331
 332    ename = '%s/%s' % (kind, name)
 333    tip = marks.get_tip(ename)
 334
 335    # mercurial takes too much time checking this
 336    if tip and tip == head.rev():
 337        # nothing to do
 338        return
 339    revs = xrange(tip, head.rev() + 1)
 340    count = 0
 341
 342    revs = [rev for rev in revs if not marks.is_marked(rev)]
 343
 344    for rev in revs:
 345
 346        c = repo[rev]
 347        (manifest, user, (time, tz), files, desc, extra) = repo.changelog.read(c.node())
 348        rev_branch = extra['branch']
 349
 350        author = "%s %d %s" % (fixup_user(user), time, gittz(tz))
 351        if 'committer' in extra:
 352            user, time, tz = extra['committer'].rsplit(' ', 2)
 353            committer = "%s %s %s" % (user, time, gittz(int(tz)))
 354        else:
 355            committer = author
 356
 357        parents = [p for p in repo.changelog.parentrevs(rev) if p >= 0]
 358
 359        if len(parents) == 0:
 360            modified = c.manifest().keys()
 361            removed = []
 362        else:
 363            modified, removed = get_filechanges(repo, c, parents[0])
 364
 365        desc += '\n'
 366
 367        if mode == 'hg':
 368            extra_msg = ''
 369
 370            if rev_branch != 'default':
 371                extra_msg += 'branch : %s\n' % rev_branch
 372
 373            renames = []
 374            for f in c.files():
 375                if f not in c.manifest():
 376                    continue
 377                rename = c.filectx(f).renamed()
 378                if rename:
 379                    renames.append((rename[0], f))
 380
 381            for e in renames:
 382                extra_msg += "rename : %s => %s\n" % e
 383
 384            for key, value in extra.iteritems():
 385                if key in ('author', 'committer', 'encoding', 'message', 'branch', 'hg-git'):
 386                    continue
 387                else:
 388                    extra_msg += "extra : %s : %s\n" % (key, urllib.quote(value))
 389
 390            if extra_msg:
 391                desc += '\n--HG--\n' + extra_msg
 392
 393        if len(parents) == 0 and rev:
 394            print 'reset %s/%s' % (prefix, ename)
 395
 396        print "commit %s/%s" % (prefix, ename)
 397        print "mark :%d" % (marks.get_mark(rev))
 398        print "author %s" % (author)
 399        print "committer %s" % (committer)
 400        print "data %d" % (len(desc))
 401        print desc
 402
 403        if len(parents) > 0:
 404            print "from :%s" % (rev_to_mark(parents[0]))
 405            if len(parents) > 1:
 406                print "merge :%s" % (rev_to_mark(parents[1]))
 407
 408        for f in modified:
 409            export_file(c.filectx(f))
 410        for f in removed:
 411            print "D %s" % (fix_file_path(f))
 412        print
 413
 414        count += 1
 415        if (count % 100 == 0):
 416            print "progress revision %d '%s' (%d/%d)" % (rev, name, count, len(revs))
 417            print "#############################################################"
 418
 419    # make sure the ref is updated
 420    print "reset %s/%s" % (prefix, ename)
 421    print "from :%u" % rev_to_mark(rev)
 422    print
 423
 424    marks.set_tip(ename, rev)
 425
 426def export_tag(repo, tag):
 427    export_ref(repo, tag, 'tags', repo[tag])
 428
 429def export_bookmark(repo, bmark):
 430    head = bmarks[bmark]
 431    export_ref(repo, bmark, 'bookmarks', head)
 432
 433def export_branch(repo, branch):
 434    tip = get_branch_tip(repo, branch)
 435    head = repo[tip]
 436    export_ref(repo, branch, 'branches', head)
 437
 438def export_head(repo):
 439    global g_head
 440    export_ref(repo, g_head[0], 'bookmarks', g_head[1])
 441
 442def do_capabilities(parser):
 443    global prefix, dirname
 444
 445    print "import"
 446    print "export"
 447    print "refspec refs/heads/branches/*:%s/branches/*" % prefix
 448    print "refspec refs/heads/*:%s/bookmarks/*" % prefix
 449    print "refspec refs/tags/*:%s/tags/*" % prefix
 450
 451    path = os.path.join(dirname, 'marks-git')
 452
 453    if os.path.exists(path):
 454        print "*import-marks %s" % path
 455    print "*export-marks %s" % path
 456
 457    print
 458
 459def get_branch_tip(repo, branch):
 460    global branches
 461
 462    heads = branches.get(branch, None)
 463    if not heads:
 464        return None
 465
 466    # verify there's only one head
 467    if (len(heads) > 1):
 468        warn("Branch '%s' has more than one head, consider merging" % branch)
 469        # older versions of mercurial don't have this
 470        if hasattr(repo, "branchtip"):
 471            return repo.branchtip(branch)
 472
 473    return heads[0]
 474
 475def list_head(repo, cur):
 476    global g_head, bmarks
 477
 478    head = bookmarks.readcurrent(repo)
 479    if head:
 480        node = repo[head]
 481    else:
 482        # fake bookmark from current branch
 483        head = cur
 484        node = repo['.']
 485        if not node:
 486            node = repo['tip']
 487        if not node:
 488            return
 489        if head == 'default':
 490            head = 'master'
 491        bmarks[head] = node
 492
 493    print "@refs/heads/%s HEAD" % head
 494    g_head = (head, node)
 495
 496def do_list(parser):
 497    global branches, bmarks, mode, track_branches
 498
 499    repo = parser.repo
 500    for bmark, node in bookmarks.listbookmarks(repo).iteritems():
 501        bmarks[bmark] = repo[node]
 502
 503    cur = repo.dirstate.branch()
 504
 505    list_head(repo, cur)
 506
 507    if track_branches:
 508        for branch in repo.branchmap():
 509            heads = repo.branchheads(branch)
 510            if len(heads):
 511                branches[branch] = heads
 512
 513        for branch in branches:
 514            print "? refs/heads/branches/%s" % branch
 515
 516    for bmark in bmarks:
 517        print "? refs/heads/%s" % bmark
 518
 519    for tag, node in repo.tagslist():
 520        if tag == 'tip':
 521            continue
 522        print "? refs/tags/%s" % tag
 523
 524    print
 525
 526def do_import(parser):
 527    repo = parser.repo
 528
 529    path = os.path.join(dirname, 'marks-git')
 530
 531    print "feature done"
 532    if os.path.exists(path):
 533        print "feature import-marks=%s" % path
 534    print "feature export-marks=%s" % path
 535    sys.stdout.flush()
 536
 537    tmp = encoding.encoding
 538    encoding.encoding = 'utf-8'
 539
 540    # lets get all the import lines
 541    while parser.check('import'):
 542        ref = parser[1]
 543
 544        if (ref == 'HEAD'):
 545            export_head(repo)
 546        elif ref.startswith('refs/heads/branches/'):
 547            branch = ref[len('refs/heads/branches/'):]
 548            export_branch(repo, branch)
 549        elif ref.startswith('refs/heads/'):
 550            bmark = ref[len('refs/heads/'):]
 551            export_bookmark(repo, bmark)
 552        elif ref.startswith('refs/tags/'):
 553            tag = ref[len('refs/tags/'):]
 554            export_tag(repo, tag)
 555
 556        parser.next()
 557
 558    encoding.encoding = tmp
 559
 560    print 'done'
 561
 562def parse_blob(parser):
 563    global blob_marks
 564
 565    parser.next()
 566    mark = parser.get_mark()
 567    parser.next()
 568    data = parser.get_data()
 569    blob_marks[mark] = data
 570    parser.next()
 571
 572def get_merge_files(repo, p1, p2, files):
 573    for e in repo[p1].files():
 574        if e not in files:
 575            if e not in repo[p1].manifest():
 576                continue
 577            f = { 'ctx' : repo[p1][e] }
 578            files[e] = f
 579
 580def parse_commit(parser):
 581    global marks, blob_marks, parsed_refs
 582    global mode
 583
 584    from_mark = merge_mark = None
 585
 586    ref = parser[1]
 587    parser.next()
 588
 589    commit_mark = parser.get_mark()
 590    parser.next()
 591    author = parser.get_author()
 592    parser.next()
 593    committer = parser.get_author()
 594    parser.next()
 595    data = parser.get_data()
 596    parser.next()
 597    if parser.check('from'):
 598        from_mark = parser.get_mark()
 599        parser.next()
 600    if parser.check('merge'):
 601        merge_mark = parser.get_mark()
 602        parser.next()
 603        if parser.check('merge'):
 604            die('octopus merges are not supported yet')
 605
 606    files = {}
 607
 608    for line in parser:
 609        if parser.check('M'):
 610            t, m, mark_ref, path = line.split(' ', 3)
 611            mark = int(mark_ref[1:])
 612            f = { 'mode' : hgmode(m), 'data' : blob_marks[mark] }
 613        elif parser.check('D'):
 614            t, path = line.split(' ', 1)
 615            f = { 'deleted' : True }
 616        else:
 617            die('Unknown file command: %s' % line)
 618        files[path] = f
 619
 620    def getfilectx(repo, memctx, f):
 621        of = files[f]
 622        if 'deleted' in of:
 623            raise IOError
 624        if 'ctx' in of:
 625            return of['ctx']
 626        is_exec = of['mode'] == 'x'
 627        is_link = of['mode'] == 'l'
 628        rename = of.get('rename', None)
 629        return context.memfilectx(f, of['data'],
 630                is_link, is_exec, rename)
 631
 632    repo = parser.repo
 633
 634    user, date, tz = author
 635    extra = {}
 636
 637    if committer != author:
 638        extra['committer'] = "%s %u %u" % committer
 639
 640    if from_mark:
 641        p1 = repo.changelog.node(mark_to_rev(from_mark))
 642    else:
 643        p1 = '\0' * 20
 644
 645    if merge_mark:
 646        p2 = repo.changelog.node(mark_to_rev(merge_mark))
 647    else:
 648        p2 = '\0' * 20
 649
 650    #
 651    # If files changed from any of the parents, hg wants to know, but in git if
 652    # nothing changed from the first parent, nothing changed.
 653    #
 654    if merge_mark:
 655        get_merge_files(repo, p1, p2, files)
 656
 657    # Check if the ref is supposed to be a named branch
 658    if ref.startswith('refs/heads/branches/'):
 659        extra['branch'] = ref[len('refs/heads/branches/'):]
 660
 661    if mode == 'hg':
 662        i = data.find('\n--HG--\n')
 663        if i >= 0:
 664            tmp = data[i + len('\n--HG--\n'):].strip()
 665            for k, v in [e.split(' : ', 1) for e in tmp.split('\n')]:
 666                if k == 'rename':
 667                    old, new = v.split(' => ', 1)
 668                    files[new]['rename'] = old
 669                elif k == 'branch':
 670                    extra[k] = v
 671                elif k == 'extra':
 672                    ek, ev = v.split(' : ', 1)
 673                    extra[ek] = urllib.unquote(ev)
 674            data = data[:i]
 675
 676    ctx = context.memctx(repo, (p1, p2), data,
 677            files.keys(), getfilectx,
 678            user, (date, tz), extra)
 679
 680    tmp = encoding.encoding
 681    encoding.encoding = 'utf-8'
 682
 683    node = repo.commitctx(ctx)
 684
 685    encoding.encoding = tmp
 686
 687    rev = repo[node].rev()
 688
 689    parsed_refs[ref] = node
 690    marks.new_mark(rev, commit_mark)
 691
 692def parse_reset(parser):
 693    global parsed_refs
 694
 695    ref = parser[1]
 696    parser.next()
 697    # ugh
 698    if parser.check('commit'):
 699        parse_commit(parser)
 700        return
 701    if not parser.check('from'):
 702        return
 703    from_mark = parser.get_mark()
 704    parser.next()
 705
 706    node = parser.repo.changelog.node(mark_to_rev(from_mark))
 707    parsed_refs[ref] = node
 708
 709def parse_tag(parser):
 710    name = parser[1]
 711    parser.next()
 712    from_mark = parser.get_mark()
 713    parser.next()
 714    tagger = parser.get_author()
 715    parser.next()
 716    data = parser.get_data()
 717    parser.next()
 718
 719    # nothing to do
 720
 721def do_export(parser):
 722    global parsed_refs, bmarks, peer
 723
 724    p_bmarks = []
 725
 726    parser.next()
 727
 728    for line in parser.each_block('done'):
 729        if parser.check('blob'):
 730            parse_blob(parser)
 731        elif parser.check('commit'):
 732            parse_commit(parser)
 733        elif parser.check('reset'):
 734            parse_reset(parser)
 735        elif parser.check('tag'):
 736            parse_tag(parser)
 737        elif parser.check('feature'):
 738            pass
 739        else:
 740            die('unhandled export command: %s' % line)
 741
 742    for ref, node in parsed_refs.iteritems():
 743        if ref.startswith('refs/heads/branches'):
 744            print "ok %s" % ref
 745        elif ref.startswith('refs/heads/'):
 746            bmark = ref[len('refs/heads/'):]
 747            p_bmarks.append((bmark, node))
 748            continue
 749        elif ref.startswith('refs/tags/'):
 750            tag = ref[len('refs/tags/'):]
 751            if mode == 'git':
 752                msg = 'Added tag %s for changeset %s' % (tag, hghex(node[:6]));
 753                parser.repo.tag([tag], node, msg, False, None, {})
 754            else:
 755                parser.repo.tag([tag], node, None, True, None, {})
 756            print "ok %s" % ref
 757        else:
 758            # transport-helper/fast-export bugs
 759            continue
 760
 761    if peer:
 762        parser.repo.push(peer, force=force_push)
 763
 764    # handle bookmarks
 765    for bmark, node in p_bmarks:
 766        ref = 'refs/heads/' + bmark
 767        new = hghex(node)
 768
 769        if bmark in bmarks:
 770            old = bmarks[bmark].hex()
 771        else:
 772            old = ''
 773
 774        if bmark == 'master' and 'master' not in parser.repo._bookmarks:
 775            # fake bookmark
 776            pass
 777        elif bookmarks.pushbookmark(parser.repo, bmark, old, new):
 778            # updated locally
 779            pass
 780        else:
 781            print "error %s" % ref
 782            continue
 783
 784        if peer:
 785            if not peer.pushkey('bookmarks', bmark, old, new):
 786                print "error %s" % ref
 787                continue
 788
 789        print "ok %s" % ref
 790
 791    print
 792
 793def fix_path(alias, repo, orig_url):
 794    repo_url = util.url(repo.url())
 795    url = util.url(orig_url)
 796    if str(url) == str(repo_url):
 797        return
 798    cmd = ['git', 'config', 'remote.%s.url' % alias, "hg::%s" % repo_url]
 799    subprocess.call(cmd)
 800
 801def main(args):
 802    global prefix, dirname, branches, bmarks
 803    global marks, blob_marks, parsed_refs
 804    global peer, mode, bad_mail, bad_name
 805    global track_branches, force_push, is_tmp
 806
 807    alias = args[1]
 808    url = args[2]
 809    peer = None
 810
 811    hg_git_compat = False
 812    track_branches = True
 813    force_push = True
 814
 815    try:
 816        if get_config('remote-hg.hg-git-compat') == 'true\n':
 817            hg_git_compat = True
 818            track_branches = False
 819        if get_config('remote-hg.track-branches') == 'false\n':
 820            track_branches = False
 821        if get_config('remote-hg.force-push') == 'false\n':
 822            force_push = False
 823    except subprocess.CalledProcessError:
 824        pass
 825
 826    if hg_git_compat:
 827        mode = 'hg'
 828        bad_mail = 'none@none'
 829        bad_name = ''
 830    else:
 831        mode = 'git'
 832        bad_mail = 'unknown'
 833        bad_name = 'Unknown'
 834
 835    if alias[4:] == url:
 836        is_tmp = True
 837        alias = util.sha1(alias).hexdigest()
 838    else:
 839        is_tmp = False
 840
 841    gitdir = os.environ['GIT_DIR']
 842    dirname = os.path.join(gitdir, 'hg', alias)
 843    branches = {}
 844    bmarks = {}
 845    blob_marks = {}
 846    parsed_refs = {}
 847    marks = None
 848
 849    repo = get_repo(url, alias)
 850    prefix = 'refs/hg/%s' % alias
 851
 852    if not is_tmp:
 853        fix_path(alias, peer or repo, url)
 854
 855    if not os.path.exists(dirname):
 856        os.makedirs(dirname)
 857
 858    marks_path = os.path.join(dirname, 'marks-hg')
 859    marks = Marks(marks_path)
 860
 861    parser = Parser(repo)
 862    for line in parser:
 863        if parser.check('capabilities'):
 864            do_capabilities(parser)
 865        elif parser.check('list'):
 866            do_list(parser)
 867        elif parser.check('import'):
 868            do_import(parser)
 869        elif parser.check('export'):
 870            do_export(parser)
 871        else:
 872            die('unhandled command: %s' % line)
 873        sys.stdout.flush()
 874
 875def bye():
 876    if not marks:
 877        return
 878    if not is_tmp:
 879        marks.store()
 880    else:
 881        shutil.rmtree(dirname)
 882
 883atexit.register(bye)
 884sys.exit(main(sys.argv))