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
  17import sys
  18
  19import bzrlib
  20bzrlib.initialize()
  21
  22import bzrlib.plugin
  23bzrlib.plugin.load_plugins()
  24
  25import bzrlib.generate_ids
  26
  27import sys
  28import os
  29import json
  30import re
  31import StringIO
  32
  33NAME_RE = re.compile('^([^<>]+)')
  34AUTHOR_RE = re.compile('^([^<>]+?)? ?<([^<>]*)>$')
  35RAW_AUTHOR_RE = re.compile('^(\w+) (.+)? <(.*)> (\d+) ([+-]\d+)')
  36
  37def die(msg, *args):
  38    sys.stderr.write('ERROR: %s\n' % (msg % args))
  39    sys.exit(1)
  40
  41def warn(msg, *args):
  42    sys.stderr.write('WARNING: %s\n' % (msg % args))
  43
  44def gittz(tz):
  45    return '%+03d%02d' % (tz / 3600, tz % 3600 / 60)
  46
  47class Marks:
  48
  49    def __init__(self, path):
  50        self.path = path
  51        self.tips = {}
  52        self.marks = {}
  53        self.rev_marks = {}
  54        self.last_mark = 0
  55        self.load()
  56
  57    def load(self):
  58        if not os.path.exists(self.path):
  59            return
  60
  61        tmp = json.load(open(self.path))
  62        self.tips = tmp['tips']
  63        self.marks = tmp['marks']
  64        self.last_mark = tmp['last-mark']
  65
  66        for rev, mark in self.marks.iteritems():
  67            self.rev_marks[mark] = rev
  68
  69    def dict(self):
  70        return { 'tips': self.tips, 'marks': self.marks, 'last-mark' : self.last_mark }
  71
  72    def store(self):
  73        json.dump(self.dict(), open(self.path, 'w'))
  74
  75    def __str__(self):
  76        return str(self.dict())
  77
  78    def from_rev(self, rev):
  79        return self.marks[rev]
  80
  81    def to_rev(self, mark):
  82        return self.rev_marks[mark]
  83
  84    def next_mark(self):
  85        self.last_mark += 1
  86        return self.last_mark
  87
  88    def get_mark(self, rev):
  89        self.last_mark += 1
  90        self.marks[rev] = self.last_mark
  91        return self.last_mark
  92
  93    def is_marked(self, rev):
  94        return self.marks.has_key(rev)
  95
  96    def new_mark(self, rev, mark):
  97        self.marks[rev] = mark
  98        self.rev_marks[mark] = rev
  99        self.last_mark = mark
 100
 101    def get_tip(self, branch):
 102        return self.tips.get(branch, None)
 103
 104    def set_tip(self, branch, tip):
 105        self.tips[branch] = tip
 106
 107class Parser:
 108
 109    def __init__(self, repo):
 110        self.repo = repo
 111        self.line = self.get_line()
 112
 113    def get_line(self):
 114        return sys.stdin.readline().strip()
 115
 116    def __getitem__(self, i):
 117        return self.line.split()[i]
 118
 119    def check(self, word):
 120        return self.line.startswith(word)
 121
 122    def each_block(self, separator):
 123        while self.line != separator:
 124            yield self.line
 125            self.line = self.get_line()
 126
 127    def __iter__(self):
 128        return self.each_block('')
 129
 130    def next(self):
 131        self.line = self.get_line()
 132        if self.line == 'done':
 133            self.line = None
 134
 135    def get_mark(self):
 136        i = self.line.index(':') + 1
 137        return int(self.line[i:])
 138
 139    def get_data(self):
 140        if not self.check('data'):
 141            return None
 142        i = self.line.index(' ') + 1
 143        size = int(self.line[i:])
 144        return sys.stdin.read(size)
 145
 146    def get_author(self):
 147        m = RAW_AUTHOR_RE.match(self.line)
 148        if not m:
 149            return None
 150        _, name, email, date, tz = m.groups()
 151        committer = '%s <%s>' % (name, email)
 152        tz = int(tz)
 153        tz = ((tz / 100) * 3600) + ((tz % 100) * 60)
 154        return (committer, int(date), tz)
 155
 156def rev_to_mark(rev):
 157    global marks
 158    return marks.from_rev(rev)
 159
 160def mark_to_rev(mark):
 161    global marks
 162    return marks.to_rev(mark)
 163
 164def fixup_user(user):
 165    name = mail = None
 166    user = user.replace('"', '')
 167    m = AUTHOR_RE.match(user)
 168    if m:
 169        name = m.group(1)
 170        mail = m.group(2).strip()
 171    else:
 172        m = NAME_RE.match(user)
 173        if m:
 174            name = m.group(1).strip()
 175
 176    return '%s <%s>' % (name, mail)
 177
 178def get_filechanges(cur, prev):
 179    modified = {}
 180    removed = {}
 181
 182    changes = cur.changes_from(prev)
 183
 184    for path, fid, kind in changes.added:
 185        modified[path] = fid
 186    for path, fid, kind in changes.removed:
 187        removed[path] = None
 188    for path, fid, kind, mod, _ in changes.modified:
 189        modified[path] = fid
 190    for oldpath, newpath, fid, kind, mod, _ in changes.renamed:
 191        removed[oldpath] = None
 192        modified[newpath] = fid
 193
 194    return modified, removed
 195
 196def export_files(tree, files):
 197    global marks, filenodes
 198
 199    final = []
 200    for path, fid in files.iteritems():
 201        h = tree.get_file_sha1(fid)
 202
 203        mode = '100644'
 204
 205        # is the blob already exported?
 206        if h in filenodes:
 207            mark = filenodes[h]
 208        else:
 209            d = tree.get_file_text(fid)
 210
 211            mark = marks.next_mark()
 212            filenodes[h] = mark
 213
 214            print "blob"
 215            print "mark :%u" % mark
 216            print "data %d" % len(d)
 217            print d
 218
 219        final.append((mode, mark, path))
 220
 221    return final
 222
 223def export_branch(branch, name):
 224    global prefix, dirname
 225
 226    ref = '%s/heads/%s' % (prefix, name)
 227    tip = marks.get_tip(name)
 228
 229    repo = branch.repository
 230    repo.lock_read()
 231    revs = branch.iter_merge_sorted_revisions(None, tip, 'exclude', 'forward')
 232    count = 0
 233
 234    revs = [revid for revid, _, _, _ in revs if not marks.is_marked(revid)]
 235
 236    for revid in revs:
 237
 238        rev = repo.get_revision(revid)
 239
 240        parents = rev.parent_ids
 241        time = rev.timestamp
 242        tz = rev.timezone
 243        committer = rev.committer.encode('utf-8')
 244        committer = "%s %u %s" % (fixup_user(committer), time, gittz(tz))
 245        author = committer
 246        msg = rev.message.encode('utf-8')
 247
 248        msg += '\n'
 249
 250        if len(parents) == 0:
 251            parent = bzrlib.revision.NULL_REVISION
 252        else:
 253            parent = parents[0]
 254
 255        cur_tree = repo.revision_tree(revid)
 256        prev = repo.revision_tree(parent)
 257        modified, removed = get_filechanges(cur_tree, prev)
 258
 259        modified_final = export_files(cur_tree, modified)
 260
 261        if len(parents) == 0:
 262            print 'reset %s' % ref
 263
 264        print "commit %s" % ref
 265        print "mark :%d" % (marks.get_mark(revid))
 266        print "author %s" % (author)
 267        print "committer %s" % (committer)
 268        print "data %d" % (len(msg))
 269        print msg
 270
 271        for i, p in enumerate(parents):
 272            try:
 273                m = rev_to_mark(p)
 274            except KeyError:
 275                # ghost?
 276                continue
 277            if i == 0:
 278                print "from :%s" % m
 279            else:
 280                print "merge :%s" % m
 281
 282        for f in modified_final:
 283            print "M %s :%u %s" % f
 284        for f in removed:
 285            print "D %s" % (f)
 286        print
 287
 288        count += 1
 289        if (count % 100 == 0):
 290            print "progress revision %s (%d/%d)" % (revid, count, len(revs))
 291            print "#############################################################"
 292
 293    repo.unlock()
 294
 295    revid = branch.last_revision()
 296
 297    # make sure the ref is updated
 298    print "reset %s" % ref
 299    print "from :%u" % rev_to_mark(revid)
 300    print
 301
 302    marks.set_tip(name, revid)
 303
 304def export_tag(repo, name):
 305    global tags
 306    try:
 307        print "reset refs/tags/%s" % name
 308        print "from :%u" % rev_to_mark(tags[name])
 309        print
 310    except KeyError:
 311        warn("TODO: fetch tag '%s'" % name)
 312
 313def do_import(parser):
 314    global dirname
 315
 316    branch = parser.repo
 317    path = os.path.join(dirname, 'marks-git')
 318
 319    print "feature done"
 320    if os.path.exists(path):
 321        print "feature import-marks=%s" % path
 322    print "feature export-marks=%s" % path
 323    sys.stdout.flush()
 324
 325    while parser.check('import'):
 326        ref = parser[1]
 327        if ref.startswith('refs/heads/'):
 328            name = ref[len('refs/heads/'):]
 329            export_branch(branch, name)
 330        if ref.startswith('refs/tags/'):
 331            name = ref[len('refs/tags/'):]
 332            export_tag(branch, name)
 333        parser.next()
 334
 335    print 'done'
 336
 337    sys.stdout.flush()
 338
 339def parse_blob(parser):
 340    global blob_marks
 341
 342    parser.next()
 343    mark = parser.get_mark()
 344    parser.next()
 345    data = parser.get_data()
 346    blob_marks[mark] = data
 347    parser.next()
 348
 349class CustomTree():
 350
 351    def __init__(self, repo, revid, parents, files):
 352        global files_cache
 353
 354        self.repo = repo
 355        self.revid = revid
 356        self.parents = parents
 357        self.updates = files
 358
 359        def copy_tree(revid):
 360            files = files_cache[revid] = {}
 361            tree = repo.repository.revision_tree(revid)
 362            repo.lock_read()
 363            try:
 364                for path, entry in tree.iter_entries_by_dir():
 365                    files[path] = entry.file_id
 366            finally:
 367                repo.unlock()
 368            return files
 369
 370        if len(parents) == 0:
 371            self.base_id = bzrlib.revision.NULL_REVISION
 372            self.base_files = {}
 373        else:
 374            self.base_id = parents[0]
 375            self.base_files = files_cache.get(self.base_id, None)
 376            if not self.base_files:
 377                self.base_files = copy_tree(self.base_id)
 378
 379        self.files = files_cache[revid] = self.base_files.copy()
 380
 381    def last_revision(self):
 382        return self.base_id
 383
 384    def iter_changes(self):
 385        changes = []
 386
 387        def get_parent(dirname, basename):
 388            parent_fid = self.base_files.get(dirname, None)
 389            if parent_fid:
 390                return parent_fid
 391            parent_fid = self.files.get(dirname, None)
 392            if parent_fid:
 393                return parent_fid
 394            if basename == '':
 395                return None
 396            d = add_entry(dirname, 'directory')
 397            return d[0]
 398
 399        def add_entry(path, kind):
 400            dirname, basename = os.path.split(path)
 401            parent_fid = get_parent(dirname, basename)
 402            fid = bzrlib.generate_ids.gen_file_id(path)
 403            change = (fid,
 404                    (None, path),
 405                    True,
 406                    (False, True),
 407                    (None, parent_fid),
 408                    (None, basename),
 409                    (None, kind),
 410                    (None, False))
 411            self.files[path] = change[0]
 412            changes.append(change)
 413            return change
 414
 415        def update_entry(path, kind):
 416            dirname, basename = os.path.split(path)
 417            fid = self.base_files[path]
 418            parent_fid = get_parent(dirname, basename)
 419            change = (fid,
 420                    (path, path),
 421                    True,
 422                    (True, True),
 423                    (None, parent_fid),
 424                    (None, basename),
 425                    (None, kind),
 426                    (None, False))
 427            self.files[path] = change[0]
 428            changes.append(change)
 429            return change
 430
 431        def remove_entry(path, kind):
 432            dirname, basename = os.path.split(path)
 433            fid = self.base_files[path]
 434            parent_fid = get_parent(dirname, basename)
 435            change = (fid,
 436                    (path, None),
 437                    True,
 438                    (True, False),
 439                    (parent_fid, None),
 440                    (None, None),
 441                    (None, None),
 442                    (None, None))
 443            del self.files[path]
 444            changes.append(change)
 445            return change
 446
 447        for path, f in self.updates.iteritems():
 448            if 'deleted' in f:
 449                remove_entry(path, 'file')
 450            elif path in self.base_files:
 451                update_entry(path, 'file')
 452            else:
 453                add_entry(path, 'file')
 454
 455        return changes
 456
 457    def get_file_with_stat(self, file_id, path=None):
 458        return (StringIO.StringIO(self.updates[path]['data']), None)
 459
 460def parse_commit(parser):
 461    global marks, blob_marks, bmarks, parsed_refs
 462    global mode
 463
 464    parents = []
 465
 466    ref = parser[1]
 467    parser.next()
 468
 469    if ref != 'refs/heads/master':
 470        die("bzr doesn't support multiple branches; use 'master'")
 471
 472    commit_mark = parser.get_mark()
 473    parser.next()
 474    author = parser.get_author()
 475    parser.next()
 476    committer = parser.get_author()
 477    parser.next()
 478    data = parser.get_data()
 479    parser.next()
 480    if parser.check('from'):
 481        parents.append(parser.get_mark())
 482        parser.next()
 483    while parser.check('merge'):
 484        parents.append(parser.get_mark())
 485        parser.next()
 486
 487    files = {}
 488
 489    for line in parser:
 490        if parser.check('M'):
 491            t, m, mark_ref, path = line.split(' ', 3)
 492            mark = int(mark_ref[1:])
 493            f = { 'mode' : m, 'data' : blob_marks[mark] }
 494        elif parser.check('D'):
 495            t, path = line.split(' ')
 496            f = { 'deleted' : True }
 497        else:
 498            die('Unknown file command: %s' % line)
 499        files[path] = f
 500
 501    repo = parser.repo
 502
 503    committer, date, tz = committer
 504    parents = [str(mark_to_rev(p)) for p in parents]
 505    revid = bzrlib.generate_ids.gen_revision_id(committer, date)
 506    props = {}
 507    props['branch-nick'] = repo.nick
 508
 509    mtree = CustomTree(repo, revid, parents, files)
 510    changes = mtree.iter_changes()
 511
 512    repo.lock_write()
 513    try:
 514        builder = repo.get_commit_builder(parents, None, date, tz, committer, props, revid, False)
 515        try:
 516            list(builder.record_iter_changes(mtree, mtree.last_revision(), changes))
 517            builder.finish_inventory()
 518            builder.commit(data.decode('utf-8', 'replace'))
 519        except Exception, e:
 520            builder.abort()
 521            raise
 522    finally:
 523        repo.unlock()
 524
 525    parsed_refs[ref] = revid
 526    marks.new_mark(revid, commit_mark)
 527
 528def parse_reset(parser):
 529    global parsed_refs
 530
 531    ref = parser[1]
 532    parser.next()
 533
 534    if ref != 'refs/heads/master':
 535        die("bzr doesn't support multiple branches; use 'master'")
 536
 537    # ugh
 538    if parser.check('commit'):
 539        parse_commit(parser)
 540        return
 541    if not parser.check('from'):
 542        return
 543    from_mark = parser.get_mark()
 544    parser.next()
 545
 546    parsed_refs[ref] = mark_to_rev(from_mark)
 547
 548def do_export(parser):
 549    global parsed_refs, dirname, peer
 550
 551    parser.next()
 552
 553    for line in parser.each_block('done'):
 554        if parser.check('blob'):
 555            parse_blob(parser)
 556        elif parser.check('commit'):
 557            parse_commit(parser)
 558        elif parser.check('reset'):
 559            parse_reset(parser)
 560        elif parser.check('tag'):
 561            pass
 562        elif parser.check('feature'):
 563            pass
 564        else:
 565            die('unhandled export command: %s' % line)
 566
 567    repo = parser.repo
 568
 569    for ref, revid in parsed_refs.iteritems():
 570        if ref == 'refs/heads/master':
 571            repo.generate_revision_history(revid, marks.get_tip('master'))
 572            revno, revid = repo.last_revision_info()
 573            peer.import_last_revision_info_and_tags(repo, revno, revid)
 574        print "ok %s" % ref
 575    print
 576
 577def do_capabilities(parser):
 578    global dirname
 579
 580    print "import"
 581    print "export"
 582    print "refspec refs/heads/*:%s/heads/*" % prefix
 583
 584    path = os.path.join(dirname, 'marks-git')
 585
 586    if os.path.exists(path):
 587        print "*import-marks %s" % path
 588    print "*export-marks %s" % path
 589
 590    print
 591
 592def do_list(parser):
 593    global tags
 594    print "? refs/heads/%s" % 'master'
 595    for tag, revid in parser.repo.tags.get_tag_dict().items():
 596        print "? refs/tags/%s" % tag
 597        tags[tag] = revid
 598    print "@refs/heads/%s HEAD" % 'master'
 599    print
 600
 601def get_repo(url, alias):
 602    global dirname, peer
 603
 604    clone_path = os.path.join(dirname, 'clone')
 605    origin = bzrlib.controldir.ControlDir.open(url)
 606    remote_branch = origin.open_branch()
 607
 608    if os.path.exists(clone_path):
 609        # pull
 610        d = bzrlib.controldir.ControlDir.open(clone_path)
 611        branch = d.open_branch()
 612        result = branch.pull(remote_branch, [], None, False)
 613    else:
 614        # clone
 615        d = origin.sprout(clone_path, None,
 616                hardlink=True, create_tree_if_local=False,
 617                source_branch=remote_branch)
 618        branch = d.open_branch()
 619        branch.bind(remote_branch)
 620
 621    peer = remote_branch
 622
 623    return branch
 624
 625def main(args):
 626    global marks, prefix, dirname
 627    global tags, filenodes
 628    global blob_marks
 629    global parsed_refs
 630    global files_cache
 631
 632    alias = args[1]
 633    url = args[2]
 634
 635    prefix = 'refs/bzr/%s' % alias
 636    tags = {}
 637    filenodes = {}
 638    blob_marks = {}
 639    parsed_refs = {}
 640    files_cache = {}
 641
 642    gitdir = os.environ['GIT_DIR']
 643    dirname = os.path.join(gitdir, 'bzr', alias)
 644
 645    if not os.path.exists(dirname):
 646        os.makedirs(dirname)
 647
 648    repo = get_repo(url, alias)
 649
 650    marks_path = os.path.join(dirname, 'marks-int')
 651    marks = Marks(marks_path)
 652
 653    parser = Parser(repo)
 654    for line in parser:
 655        if parser.check('capabilities'):
 656            do_capabilities(parser)
 657        elif parser.check('list'):
 658            do_list(parser)
 659        elif parser.check('import'):
 660            do_import(parser)
 661        elif parser.check('export'):
 662            do_export(parser)
 663        else:
 664            die('unhandled command: %s' % line)
 665        sys.stdout.flush()
 666
 667    marks.store()
 668
 669sys.exit(main(sys.argv))