21
from warnings import warn
22
from cStringIO import StringIO
22
26
from bzrlib.trace import mutter, note
23
from bzrlib.osutils import isdir, quotefn, compact_date, rand_bytes, \
25
sha_file, appendpath, file_kind
26
from bzrlib.errors import BzrError, InvalidRevisionNumber, InvalidRevisionId
27
from bzrlib.osutils import (isdir, quotefn, compact_date, rand_bytes,
28
rename, splitpath, sha_file, appendpath,
30
from bzrlib.errors import (BzrError, InvalidRevisionNumber, InvalidRevisionId,
31
NoSuchRevision, HistoryMissing, NotBranchError,
32
DivergedBranches, LockError, UnlistableStore,
33
UnlistableBranch, NoSuchFile)
28
34
from bzrlib.textui import show_status
29
from bzrlib.revision import Revision
30
from bzrlib.xml import unpack_xml
35
from bzrlib.revision import Revision, validate_revision_id, is_ancestor
31
36
from bzrlib.delta import compare_trees
32
37
from bzrlib.tree import EmptyTree, RevisionTree
34
BZR_BRANCH_FORMAT = "Bazaar-NG branch, format 0.0.4\n"
38
from bzrlib.inventory import Inventory
39
from bzrlib.store import copy_all
40
from bzrlib.store.compressed_text import CompressedTextStore
41
from bzrlib.store.text import TextStore
42
from bzrlib.store.weave import WeaveStore
43
from bzrlib.transport import Transport, get_transport
48
BZR_BRANCH_FORMAT_4 = "Bazaar-NG branch, format 0.0.4\n"
49
BZR_BRANCH_FORMAT_5 = "Bazaar-NG branch, format 5\n"
35
50
## TODO: Maybe include checks for common corruption of newlines, etc?
38
53
# TODO: Some operations like log might retrieve the same revisions
39
54
# repeatedly to calculate deltas. We could perhaps have a weakref
40
# cache in memory to make this faster.
43
def find_branch(f, **args):
44
if f and (f.startswith('http://') or f.startswith('https://')):
46
return remotebranch.RemoteBranch(f, **args)
48
return Branch(f, **args)
51
def find_cached_branch(f, cache_root, **args):
52
from remotebranch import RemoteBranch
53
br = find_branch(f, **args)
54
def cacheify(br, store_name):
55
from meta_store import CachedStore
56
cache_path = os.path.join(cache_root, store_name)
58
new_store = CachedStore(getattr(br, store_name), cache_path)
59
setattr(br, store_name, new_store)
61
if isinstance(br, RemoteBranch):
62
cacheify(br, 'inventory_store')
63
cacheify(br, 'text_store')
64
cacheify(br, 'revision_store')
55
# cache in memory to make this faster. In general anything can be
56
# cached in memory between lock and unlock operations.
58
def find_branch(*ignored, **ignored_too):
59
# XXX: leave this here for about one release, then remove it
60
raise NotImplementedError('find_branch() is not supported anymore, '
61
'please use one of the new branch constructors')
68
62
def _relpath(base, path):
69
63
"""Return path relative to base, or raise exception.
150
174
Lock object from bzrlib.lock.
176
# We actually expect this class to be somewhat short-lived; part of its
177
# purpose is to try to isolate what bits of the branch logic are tied to
178
# filesystem access, so that in a later step, we can extricate them to
179
# a separarte ("storage") class.
153
180
_lock_mode = None
154
181
_lock_count = None
183
_inventory_weave = None
157
185
# Map some sort of prefix into a namespace
158
186
# stuff like "revno:10", "revid:", etc.
159
187
# This should match a prefix with a function which accepts
160
188
REVISION_NAMESPACES = {}
162
def __init__(self, base, init=False, find_root=True):
190
def push_stores(self, branch_to):
191
"""Copy the content of this branches store to branch_to."""
192
if (self._branch_format != branch_to._branch_format
193
or self._branch_format != 4):
194
from bzrlib.fetch import greedy_fetch
195
mutter("falling back to fetch logic to push between %s(%s) and %s(%s)",
196
self, self._branch_format, branch_to, branch_to._branch_format)
197
greedy_fetch(to_branch=branch_to, from_branch=self,
198
revision=self.last_revision())
201
store_pairs = ((self.text_store, branch_to.text_store),
202
(self.inventory_store, branch_to.inventory_store),
203
(self.revision_store, branch_to.revision_store))
205
for from_store, to_store in store_pairs:
206
copy_all(from_store, to_store)
207
except UnlistableStore:
208
raise UnlistableBranch(from_store)
210
def __init__(self, transport, init=False,
211
relax_version_check=False):
163
212
"""Create new branch object at a particular location.
165
base -- Base directory for the branch.
214
transport -- A Transport object, defining how to access files.
215
(If a string, transport.transport() will be used to
216
create a Transport object)
167
218
init -- If True, create new control files in a previously
168
219
unversioned directory. If False, the branch must already
171
find_root -- If true and init is false, find the root of the
172
existing branch containing base.
222
relax_version_check -- If true, the usual check for the branch
223
version is not applied. This is intended only for
224
upgrade/recovery type use; it's not guaranteed that
225
all operations will work on old format branches.
174
227
In the test suite, creation of new trees is tested using the
175
228
`ScratchBranch` class.
177
from bzrlib.store import ImmutableStore
230
assert isinstance(transport, Transport), \
231
"%r is not a Transport" % transport
232
self._transport = transport
179
self.base = os.path.realpath(base)
180
234
self._make_control()
182
self.base = find_branch_root(base)
184
self.base = os.path.realpath(base)
185
if not isdir(self.controlfilename('.')):
186
from errors import NotBranchError
187
raise NotBranchError("not a bzr branch: %s" % quotefn(base),
188
['use "bzr init" to initialize a new working tree',
189
'current bzr can only operate from top-of-tree'])
192
self.text_store = ImmutableStore(self.controlfilename('text-store'))
193
self.revision_store = ImmutableStore(self.controlfilename('revision-store'))
194
self.inventory_store = ImmutableStore(self.controlfilename('inventory-store'))
235
self._check_format(relax_version_check)
237
def get_store(name, compressed=True):
238
relpath = self._rel_controlfilename(name)
240
store = CompressedTextStore(self._transport.clone(relpath))
242
store = TextStore(self._transport.clone(relpath))
243
if self._transport.should_cache():
244
from meta_store import CachedStore
245
cache_path = os.path.join(self.cache_root, name)
247
store = CachedStore(store, cache_path)
250
relpath = self._rel_controlfilename(name)
251
ws = WeaveStore(self._transport.clone(relpath))
252
if self._transport.should_cache():
253
ws.enable_cache = True
256
if self._branch_format == 4:
257
self.inventory_store = get_store('inventory-store')
258
self.text_store = get_store('text-store')
259
self.revision_store = get_store('revision-store')
260
elif self._branch_format == 5:
261
self.control_weaves = get_weave([])
262
self.weave_store = get_weave('weaves')
263
self.revision_store = get_store('revision-store', compressed=False)
197
265
def __str__(self):
198
return '%s(%r)' % (self.__class__.__name__, self.base)
266
return '%s(%r)' % (self.__class__.__name__, self._transport.base)
201
269
__repr__ = __str__
282
367
Controlfiles should almost never be opened in write mode but
283
368
rather should be atomically copied and replaced using atomicfile.
286
fn = self.controlfilename(file_or_path)
288
if mode == 'rb' or mode == 'wb':
289
return file(fn, mode)
290
elif mode == 'r' or mode == 'w':
291
# open in binary mode anyhow so there's no newline translation;
292
# codecs uses line buffering by default; don't want that.
294
return codecs.open(fn, mode + 'b', 'utf-8',
372
relpath = self._rel_controlfilename(file_or_path)
373
#TODO: codecs.open() buffers linewise, so it was overloaded with
374
# a much larger buffer, do we need to do the same for getreader/getwriter?
376
return self._transport.get(relpath)
378
raise BzrError("Branch.controlfile(mode='wb') is not supported, use put_controlfiles")
380
return codecs.getreader('utf-8')(self._transport.get(relpath), errors='replace')
382
raise BzrError("Branch.controlfile(mode='w') is not supported, use put_controlfiles")
297
384
raise BzrError("invalid controlfile mode %r" % mode)
386
def put_controlfile(self, path, f, encode=True):
387
"""Write an entry as a controlfile.
389
:param path: The path to put the file, relative to the .bzr control
391
:param f: A file-like or string object whose contents should be copied.
392
:param encode: If true, encode the contents as utf-8
394
self.put_controlfiles([(path, f)], encode=encode)
396
def put_controlfiles(self, files, encode=True):
397
"""Write several entries as controlfiles.
399
:param files: A list of [(path, file)] pairs, where the path is the directory
400
underneath the bzr control directory
401
:param encode: If true, encode the contents as utf-8
405
for path, f in files:
407
if isinstance(f, basestring):
408
f = f.encode('utf-8', 'replace')
410
f = codecs.getwriter('utf-8')(f, errors='replace')
411
path = self._rel_controlfilename(path)
412
ctrl_files.append((path, f))
413
self._transport.put_multi(ctrl_files)
301
415
def _make_control(self):
302
416
from bzrlib.inventory import Inventory
303
from bzrlib.xml import pack_xml
417
from bzrlib.weavefile import write_weave_v5
418
from bzrlib.weave import Weave
305
os.mkdir(self.controlfilename([]))
306
self.controlfile('README', 'w').write(
420
# Create an empty inventory
422
# if we want per-tree root ids then this is the place to set
423
# them; they're not needed for now and so ommitted for
425
bzrlib.xml5.serializer_v5.write_inventory(Inventory(), sio)
426
empty_inv = sio.getvalue()
428
bzrlib.weavefile.write_weave_v5(Weave(), sio)
429
empty_weave = sio.getvalue()
431
dirs = [[], 'revision-store', 'weaves']
307
433
"This is a Bazaar-NG control directory.\n"
308
"Do not change any files in this directory.\n")
309
self.controlfile('branch-format', 'w').write(BZR_BRANCH_FORMAT)
310
for d in ('text-store', 'inventory-store', 'revision-store'):
311
os.mkdir(self.controlfilename(d))
312
for f in ('revision-history', 'merged-patches',
313
'pending-merged-patches', 'branch-name',
316
self.controlfile(f, 'w').write('')
317
mutter('created control directory in ' + self.base)
319
pack_xml(Inventory(gen_root_id()), self.controlfile('inventory','w'))
322
def _check_format(self):
434
"Do not change any files in this directory.\n"),
435
('branch-format', BZR_BRANCH_FORMAT_5),
436
('revision-history', ''),
439
('pending-merges', ''),
440
('inventory', empty_inv),
441
('inventory.weave', empty_weave),
442
('ancestry.weave', empty_weave)
444
cfn = self._rel_controlfilename
445
self._transport.mkdir_multi([cfn(d) for d in dirs])
446
self.put_controlfiles(files)
447
mutter('created control directory in ' + self._transport.base)
449
def _check_format(self, relax_version_check):
323
450
"""Check this branch format is supported.
325
The current tool only supports the current unstable format.
452
The format level is stored, as an integer, in
453
self._branch_format for code that needs to check it later.
327
455
In the future, we might need different in-memory Branch
328
456
classes to support downlevel branches. But not yet.
330
# This ignores newlines so that we can open branches created
331
# on Windows from Linux and so on. I think it might be better
332
# to always make all internal files in unix format.
333
fmt = self.controlfile('branch-format', 'r').read()
334
fmt.replace('\r\n', '')
335
if fmt != BZR_BRANCH_FORMAT:
459
fmt = self.controlfile('branch-format', 'r').read()
461
raise NotBranchError(self.base)
463
if fmt == BZR_BRANCH_FORMAT_5:
464
self._branch_format = 5
465
elif fmt == BZR_BRANCH_FORMAT_4:
466
self._branch_format = 4
468
if (not relax_version_check
469
and self._branch_format != 5):
336
470
raise BzrError('sorry, branch format %r not supported' % fmt,
337
471
['use a different bzr version',
338
'or remove the .bzr directory and "bzr init" again'])
472
'or remove the .bzr directory'
473
' and "bzr init" again'])
340
475
def get_root_id(self):
341
476
"""Return the id of this branches root"""
645
763
# the revision, (add signatures/remove signatures) and still
646
764
# have all hash pointers stay consistent.
647
765
# But for now, just hash the contents.
648
return bzrlib.osutils.sha_file(self.get_revision_xml(revision_id))
651
def get_inventory(self, inventory_id):
652
"""Get Inventory object by hash.
654
TODO: Perhaps for this and similar methods, take a revision
655
parameter which can be either an integer revno or a
657
from bzrlib.inventory import Inventory
658
from bzrlib.xml import unpack_xml
660
return unpack_xml(Inventory, self.inventory_store[inventory_id])
663
def get_inventory_sha1(self, inventory_id):
766
return bzrlib.osutils.sha_file(self.get_revision_xml_file(revision_id))
768
def _get_ancestry_weave(self):
769
return self.control_weaves.get_weave('ancestry')
771
def get_ancestry(self, revision_id):
772
"""Return a list of revision-ids integrated by a revision.
775
if revision_id is None:
777
w = self._get_ancestry_weave()
778
return [None] + [l[:-1] for l in w.get_iter(w.lookup(revision_id))]
780
def get_inventory_weave(self):
781
return self.control_weaves.get_weave('inventory')
783
def get_inventory(self, revision_id):
784
"""Get Inventory object by hash."""
785
xml = self.get_inventory_xml(revision_id)
786
return bzrlib.xml5.serializer_v5.read_inventory_from_string(xml)
788
def get_inventory_xml(self, revision_id):
789
"""Get inventory XML as a file object."""
791
assert isinstance(revision_id, basestring), type(revision_id)
792
iw = self.get_inventory_weave()
793
return iw.get_text(iw.lookup(revision_id))
795
raise bzrlib.errors.HistoryMissing(self, 'inventory', revision_id)
797
def get_inventory_sha1(self, revision_id):
664
798
"""Return the sha1 hash of the inventory entry
666
return sha_file(self.inventory_store[inventory_id])
800
return self.get_revision(revision_id).inventory_sha1
669
802
def get_revision_inventory(self, revision_id):
670
803
"""Return inventory of a past revision."""
671
# bzr 0.0.6 imposes the constraint that the inventory_id
804
# TODO: Unify this with get_inventory()
805
# bzr 0.0.6 and later imposes the constraint that the inventory_id
672
806
# must be the same as its revision, so this is trivial.
673
807
if revision_id == None:
674
from bzrlib.inventory import Inventory
675
808
return Inventory(self.get_root_id())
677
810
return self.get_inventory(revision_id)
680
812
def revision_history(self):
681
"""Return sequence of revision hashes on to this branch.
683
>>> ScratchBranch().revision_history()
813
"""Return sequence of revision hashes on to this branch."""
688
816
return [l.rstrip('\r\n') for l in
794
925
if stop_revision is None:
795
926
stop_revision = other_len
796
elif stop_revision > other_len:
797
raise NoSuchRevision(self, stop_revision)
928
assert isinstance(stop_revision, int)
929
if stop_revision > other_len:
930
raise bzrlib.errors.NoSuchRevision(self, stop_revision)
799
931
return other_history[self_len:stop_revision]
802
933
def update_revisions(self, other, stop_revision=None):
803
"""Pull in all new revisions from other branch.
805
>>> from bzrlib.commit import commit
806
>>> bzrlib.trace.silent = True
807
>>> br1 = ScratchBranch(files=['foo', 'bar'])
810
>>> commit(br1, "lala!", rev_id="REVISION-ID-1", verbose=False)
811
>>> br2 = ScratchBranch()
812
>>> br2.update_revisions(br1)
816
>>> br2.revision_history()
818
>>> br2.update_revisions(br1)
822
>>> br1.text_store.total_size() == br2.text_store.total_size()
825
from bzrlib.progress import ProgressBar
829
pb.update('comparing histories')
830
revision_ids = self.missing_revisions(other, stop_revision)
832
if hasattr(other.revision_store, "prefetch"):
833
other.revision_store.prefetch(revision_ids)
834
if hasattr(other.inventory_store, "prefetch"):
835
inventory_ids = [other.get_revision(r).inventory_id
836
for r in revision_ids]
837
other.inventory_store.prefetch(inventory_ids)
842
for rev_id in revision_ids:
844
pb.update('fetching revision', i, len(revision_ids))
845
rev = other.get_revision(rev_id)
846
revisions.append(rev)
847
inv = other.get_inventory(str(rev.inventory_id))
848
for key, entry in inv.iter_entries():
849
if entry.text_id is None:
851
if entry.text_id not in self.text_store:
852
needed_texts.add(entry.text_id)
856
count = self.text_store.copy_multi(other.text_store, needed_texts)
857
print "Added %d texts." % count
858
inventory_ids = [ f.inventory_id for f in revisions ]
859
count = self.inventory_store.copy_multi(other.inventory_store,
861
print "Added %d inventories." % count
862
revision_ids = [ f.revision_id for f in revisions]
863
count = self.revision_store.copy_multi(other.revision_store,
865
for revision_id in revision_ids:
866
self.append_revision(revision_id)
867
print "Added %d revisions." % count
934
"""Pull in new perfect-fit revisions."""
935
from bzrlib.fetch import greedy_fetch
936
from bzrlib.revision import get_intervening_revisions
937
if stop_revision is None:
938
stop_revision = other.last_revision()
939
greedy_fetch(to_branch=self, from_branch=other,
940
revision=stop_revision)
941
pullable_revs = self.missing_revisions(
942
other, other.revision_id_to_revno(stop_revision))
944
greedy_fetch(to_branch=self,
946
revision=pullable_revs[-1])
947
self.append_revision(*pullable_revs)
870
950
def commit(self, *args, **kw):
871
from bzrlib.commit import commit
872
commit(self, *args, **kw)
875
def lookup_revision(self, revision):
876
"""Return the revision identifier for a given revision information."""
877
revno, info = self.get_revision_info(revision)
880
def get_revision_info(self, revision):
881
"""Return (revno, revision id) for revision identifier.
883
revision can be an integer, in which case it is assumed to be revno (though
884
this will translate negative values into positive ones)
885
revision can also be a string, in which case it is parsed for something like
886
'date:' or 'revid:' etc.
891
try:# Convert to int if possible
892
revision = int(revision)
895
revs = self.revision_history()
896
if isinstance(revision, int):
899
# Mabye we should do this first, but we don't need it if revision == 0
901
revno = len(revs) + revision + 1
904
elif isinstance(revision, basestring):
905
for prefix, func in Branch.REVISION_NAMESPACES.iteritems():
906
if revision.startswith(prefix):
907
revno = func(self, revs, revision)
910
raise BzrError('No namespace registered for string: %r' % revision)
912
if revno is None or revno <= 0 or revno > len(revs):
913
raise BzrError("no such revision %s" % revision)
914
return revno, revs[revno-1]
916
def _namespace_revno(self, revs, revision):
917
"""Lookup a revision by revision number"""
918
assert revision.startswith('revno:')
920
return int(revision[6:])
923
REVISION_NAMESPACES['revno:'] = _namespace_revno
925
def _namespace_revid(self, revs, revision):
926
assert revision.startswith('revid:')
928
return revs.index(revision[6:]) + 1
931
REVISION_NAMESPACES['revid:'] = _namespace_revid
933
def _namespace_last(self, revs, revision):
934
assert revision.startswith('last:')
936
offset = int(revision[5:])
941
raise BzrError('You must supply a positive value for --revision last:XXX')
942
return len(revs) - offset + 1
943
REVISION_NAMESPACES['last:'] = _namespace_last
945
def _namespace_tag(self, revs, revision):
946
assert revision.startswith('tag:')
947
raise BzrError('tag: namespace registered, but not implemented.')
948
REVISION_NAMESPACES['tag:'] = _namespace_tag
950
def _namespace_date(self, revs, revision):
951
assert revision.startswith('date:')
953
# Spec for date revisions:
955
# value can be 'yesterday', 'today', 'tomorrow' or a YYYY-MM-DD string.
956
# it can also start with a '+/-/='. '+' says match the first
957
# entry after the given date. '-' is match the first entry before the date
958
# '=' is match the first entry after, but still on the given date.
960
# +2005-05-12 says find the first matching entry after May 12th, 2005 at 0:00
961
# -2005-05-12 says find the first matching entry before May 12th, 2005 at 0:00
962
# =2005-05-12 says find the first match after May 12th, 2005 at 0:00 but before
963
# May 13th, 2005 at 0:00
965
# So the proper way of saying 'give me all entries for today' is:
966
# -r {date:+today}:{date:-tomorrow}
967
# The default is '=' when not supplied
970
if val[:1] in ('+', '-', '='):
971
match_style = val[:1]
974
today = datetime.datetime.today().replace(hour=0,minute=0,second=0,microsecond=0)
975
if val.lower() == 'yesterday':
976
dt = today - datetime.timedelta(days=1)
977
elif val.lower() == 'today':
979
elif val.lower() == 'tomorrow':
980
dt = today + datetime.timedelta(days=1)
983
# This should be done outside the function to avoid recompiling it.
984
_date_re = re.compile(
985
r'(?P<date>(?P<year>\d\d\d\d)-(?P<month>\d\d)-(?P<day>\d\d))?'
987
r'(?P<time>(?P<hour>\d\d):(?P<minute>\d\d)(:(?P<second>\d\d))?)?'
989
m = _date_re.match(val)
990
if not m or (not m.group('date') and not m.group('time')):
991
raise BzrError('Invalid revision date %r' % revision)
994
year, month, day = int(m.group('year')), int(m.group('month')), int(m.group('day'))
996
year, month, day = today.year, today.month, today.day
998
hour = int(m.group('hour'))
999
minute = int(m.group('minute'))
1000
if m.group('second'):
1001
second = int(m.group('second'))
1005
hour, minute, second = 0,0,0
1007
dt = datetime.datetime(year=year, month=month, day=day,
1008
hour=hour, minute=minute, second=second)
1012
if match_style == '-':
1014
elif match_style == '=':
1015
last = dt + datetime.timedelta(days=1)
1018
for i in range(len(revs)-1, -1, -1):
1019
r = self.get_revision(revs[i])
1020
# TODO: Handle timezone.
1021
dt = datetime.datetime.fromtimestamp(r.timestamp)
1022
if first >= dt and (last is None or dt >= last):
1025
for i in range(len(revs)):
1026
r = self.get_revision(revs[i])
1027
# TODO: Handle timezone.
1028
dt = datetime.datetime.fromtimestamp(r.timestamp)
1029
if first <= dt and (last is None or dt <= last):
1031
REVISION_NAMESPACES['date:'] = _namespace_date
951
from bzrlib.commit import Commit
952
Commit().commit(self, *args, **kw)
954
def revision_id_to_revno(self, revision_id):
955
"""Given a revision id, return its revno"""
956
if revision_id is None:
958
history = self.revision_history()
960
return history.index(revision_id) + 1
962
raise bzrlib.errors.NoSuchRevision(self, revision_id)
964
def get_rev_id(self, revno, history=None):
965
"""Find the revision id of the specified revno."""
969
history = self.revision_history()
970
elif revno <= 0 or revno > len(history):
971
raise bzrlib.errors.NoSuchRevision(self, revno)
972
return history[revno - 1]
1033
974
def revision_tree(self, revision_id):
1034
975
"""Return Tree for a revision on this branch.
1240
def add_pending_merge(self, revision_id):
1241
from bzrlib.revision import validate_revision_id
1243
validate_revision_id(revision_id)
1181
def add_pending_merge(self, *revision_ids):
1182
# TODO: Perhaps should check at this point that the
1183
# history of the revision is actually present?
1184
for rev_id in revision_ids:
1185
validate_revision_id(rev_id)
1245
1187
p = self.pending_merges()
1246
if revision_id in p:
1248
p.append(revision_id)
1249
self.set_pending_merges(p)
1189
for rev_id in revision_ids:
1195
self.set_pending_merges(p)
1252
1197
def set_pending_merges(self, rev_list):
1200
self.put_controlfile('pending-merges', '\n'.join(rev_list))
1205
def get_parent(self):
1206
"""Return the parent location of the branch.
1208
This is the default location for push/pull/missing. The usual
1209
pattern is that the user can override it by specifying a
1213
_locs = ['parent', 'pull', 'x-pull']
1216
return self.controlfile(l, 'r').read().strip('\n')
1218
if e.errno != errno.ENOENT:
1223
def set_parent(self, url):
1224
# TODO: Maybe delete old location files?
1253
1225
from bzrlib.atomicfile import AtomicFile
1254
1226
self.lock_write()
1256
f = AtomicFile(self.controlfilename('pending-merges'))
1228
f = AtomicFile(self.controlfilename('parent'))
1268
class ScratchBranch(Branch):
1237
def check_revno(self, revno):
1239
Check whether a revno corresponds to any revision.
1240
Zero (the NULL revision) is considered valid.
1243
self.check_real_revno(revno)
1245
def check_real_revno(self, revno):
1247
Check whether a revno corresponds to a real revision.
1248
Zero (the NULL revision) is considered invalid
1250
if revno < 1 or revno > self.revno():
1251
raise InvalidRevisionNumber(revno)
1257
class ScratchBranch(_Branch):
1269
1258
"""Special test class: a branch that cleans up after itself.
1271
1260
>>> b = ScratchBranch()