21
21
that has merged into it. As the first step of a merge, pull, or
22
22
branch operation we copy history from the source into the destination
25
The copying is done in a slightly complicated order. We don't want to
26
add a revision to the store until everything it refers to is also
27
stored, so that if a revision is present we can totally recreate it.
28
However, we can't know what files are included in a revision until we
29
read its inventory. So we query the inventory store of the source for
30
the ids we need, and then pull those ids and then return to the inventories.
28
from bzrlib.lazy_import import lazy_import
29
lazy_import(globals(), """
36
import bzrlib.errors as errors
37
from bzrlib.errors import InstallFailed
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from bzrlib.progress import ProgressPhase
40
39
from bzrlib.revision import NULL_REVISION
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from bzrlib.tsort import topo_sort
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41
from bzrlib.trace import mutter
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from bzrlib.versionedfile import filter_absent, FulltextContentFactory
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# TODO: Avoid repeatedly opening weaves so many times.
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# XXX: This doesn't handle ghost (not present in branch) revisions at
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# all yet. I'm not sure they really should be supported.
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# NOTE: This doesn't copy revisions which may be present but not
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# merged into the last revision. I'm not sure we want to do that.
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# - get a list of revisions that need to be pulled in
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# - for each one, pull in that revision file
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# and get the inventory, and store the inventory with right
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# - and get the ancestry, and store that with right parents too
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# - and keep a note of all file ids and version seen
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# - then go through all files; for each one get the weave,
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# and add in all file versions
44
63
class RepoFetcher(object):
45
64
"""Pull revisions and texts from one repository to another.
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if set, try to limit to the data this revision references.
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count_copied -- number of revisions copied
47
72
This should not be used directly, it's essential a object to encapsulate
48
73
the logic in InterRepository.fetch().
51
def __init__(self, to_repository, from_repository, last_revision=None,
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find_ghosts=True, fetch_spec=None):
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def __init__(self, to_repository, from_repository, last_revision=None, pb=None,
53
78
"""Create a repo fetcher.
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:param last_revision: If set, try to limit to the data this revision
57
80
:param find_ghosts: If True search the entire history for ghosts.
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:param _write_group_acquired_callable: Don't use; this parameter only
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exists to facilitate a hack done in InterPackRepo.fetch. We would
83
like to remove this parameter.
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# repository.fetch has the responsibility for short-circuiting
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# attempts to copy between a repository and itself.
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self.failed_revisions = []
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if to_repository.has_same_location(from_repository):
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# repository.fetch should be taking care of this case.
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raise errors.BzrError('RepoFetcher run '
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'between two objects at the same location: '
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'%r and %r' % (to_repository, from_repository))
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self.to_repository = to_repository
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self.from_repository = from_repository
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95
self.sink = to_repository._get_sink()
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# must not mutate self._last_revision as its potentially a shared instance
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97
self._last_revision = last_revision
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self._fetch_spec = fetch_spec
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98
self.find_ghosts = find_ghosts
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self.pb = bzrlib.ui.ui_factory.nested_progress_bar()
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self.nested_pb = self.pb
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self.nested_pb = None
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105
self.from_repository.lock_read()
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mutter("Using fetch logic to copy between %s(%s) and %s(%s)",
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self.from_repository, self.from_repository._format,
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self.to_repository, self.to_repository._format)
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if self.nested_pb is not None:
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self.nested_pb.finished()
75
113
self.from_repository.unlock()
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146
# item_keys_introduced_by should have a richer API than it does at the
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147
# moment, so that it can feed the progress information back to this
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if (self.from_repository._format.rich_root_data and
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not self.to_repository._format.rich_root_data):
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raise errors.IncompatibleRepositories(
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self.from_repository, self.to_repository,
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"different rich-root support")
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pb = ui.ui_factory.nested_progress_bar()
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self.pb = bzrlib.ui.ui_factory.nested_progress_bar()
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pb.update("Get stream source")
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source = self.from_repository._get_source(
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self.to_repository._format)
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stream = source.get_stream(search)
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151
from_format = self.from_repository._format
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pb.update("Inserting stream")
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stream = self.get_stream(search, pp)
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153
resume_tokens, missing_keys = self.sink.insert_stream(
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154
stream, from_format, [])
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if self.to_repository._fallback_repositories:
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self._parent_inventories(search.get_keys()))
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pb.update("Missing keys")
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stream = source.get_stream_for_missing_keys(missing_keys)
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pb.update("Inserting missing keys")
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stream = self.get_stream_for_missing_keys(missing_keys)
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157
resume_tokens, missing_keys = self.sink.insert_stream(
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158
stream, from_format, resume_tokens)
142
164
raise AssertionError(
143
165
"second push failed to commit the fetch %r." % (
145
pb.update("Finishing stream")
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167
self.sink.finished()
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if self.pb is not None:
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def get_stream(self, search, pp):
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revs = search.get_keys()
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graph = self.from_repository.get_graph()
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revs = list(graph.iter_topo_order(revs))
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data_to_fetch = self.from_repository.item_keys_introduced_by(
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for knit_kind, file_id, revisions in data_to_fetch:
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if knit_kind != phase:
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# Make a new progress bar for this phase
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self.pb = bzrlib.ui.ui_factory.nested_progress_bar()
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if knit_kind == "file":
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# Accumulate file texts
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text_keys.extend([(file_id, revision) for revision in
191
elif knit_kind == "inventory":
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# Now copy the file texts.
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from_texts = self.from_repository.texts
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yield ('texts', from_texts.get_record_stream(
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text_keys, self.to_repository._fetch_order,
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not self.to_repository._fetch_uses_deltas))
197
# Cause an error if a text occurs after we have done the
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# Before we process the inventory we generate the root
201
# texts (if necessary) so that the inventories references
203
for _ in self._generate_root_texts(revs):
205
# NB: This currently reopens the inventory weave in source;
206
# using a single stream interface instead would avoid this.
207
self.pb.update("fetch inventory", 0, 1)
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from_weave = self.from_repository.inventories
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# we fetch only the referenced inventories because we do not
210
# know for unselected inventories whether all their required
211
# texts are present in the other repository - it could be
213
yield ('inventories', from_weave.get_record_stream(
214
[(rev_id,) for rev_id in revs],
215
self.inventory_fetch_order(),
216
not self.delta_on_metadata()))
217
elif knit_kind == "signatures":
218
# Nothing to do here; this will be taken care of when
219
# _fetch_revision_texts happens.
221
elif knit_kind == "revisions":
222
for _ in self._fetch_revision_texts(revs, self.pb):
225
raise AssertionError("Unknown knit kind %r" % knit_kind)
226
self.count_copied += len(revs)
228
def get_stream_for_missing_keys(self, missing_keys):
229
# missing keys can only occur when we are byte copying and not
230
# translating (because translation means we don't send
231
# unreconstructable deltas ever).
233
keys['texts'] = set()
234
keys['revisions'] = set()
235
keys['inventories'] = set()
236
keys['signatures'] = set()
237
for key in missing_keys:
238
keys[key[0]].add(key[1:])
239
if len(keys['revisions']):
240
# If we allowed copying revisions at this point, we could end up
241
# copying a revision without copying its required texts: a
242
# violation of the requirements for repository integrity.
243
raise AssertionError(
244
'cannot copy revisions to fill in missing deltas %s' % (
246
for substream_kind, keys in keys.iteritems():
247
vf = getattr(self.from_repository, substream_kind)
248
# Ask for full texts always so that we don't need more round trips
250
stream = vf.get_record_stream(keys,
251
self.to_repository._fetch_order, True)
252
yield substream_kind, stream
150
254
def _revids_to_fetch(self):
151
255
"""Determines the exact revisions needed from self.from_repository to
154
258
If no revisions need to be fetched, then this just returns None.
156
if self._fetch_spec is not None:
157
return self._fetch_spec
158
260
mutter('fetch up to rev {%s}', self._last_revision)
159
261
if self._last_revision is NULL_REVISION:
160
262
# explicit limit of no revisions needed
162
return self.to_repository.search_missing_revision_ids(
163
self.from_repository, self._last_revision,
164
find_ghosts=self.find_ghosts)
166
def _parent_inventories(self, revision_ids):
167
# Find all the parent revisions referenced by the stream, but
168
# not present in the stream, and make sure we send their
170
parent_maps = self.to_repository.get_parent_map(revision_ids)
172
map(parents.update, parent_maps.itervalues())
173
parents.discard(NULL_REVISION)
174
parents.difference_update(revision_ids)
175
missing_keys = set(('inventories', rev_id) for rev_id in parents)
264
if (self._last_revision is not None and
265
self.to_repository.has_revision(self._last_revision)):
268
return self.to_repository.search_missing_revision_ids(
269
self.from_repository, self._last_revision,
270
find_ghosts=self.find_ghosts)
271
except errors.NoSuchRevision, e:
272
raise InstallFailed([self._last_revision])
274
def _fetch_revision_texts(self, revs, pb):
275
# fetch signatures first and then the revision texts
276
# may need to be a InterRevisionStore call here.
277
from_sf = self.from_repository.signatures
278
# A missing signature is just skipped.
279
keys = [(rev_id,) for rev_id in revs]
280
signatures = filter_absent(from_sf.get_record_stream(
282
self.to_repository._fetch_order,
283
not self.to_repository._fetch_uses_deltas))
284
# If a revision has a delta, this is actually expanded inside the
285
# insert_record_stream code now, which is an alternate fix for
287
from_rf = self.from_repository.revisions
288
revisions = from_rf.get_record_stream(
290
self.to_repository._fetch_order,
291
not self.delta_on_metadata())
292
return [('signatures', signatures), ('revisions', revisions)]
294
def _generate_root_texts(self, revs):
295
"""This will be called by __fetch between fetching weave texts and
296
fetching the inventory weave.
298
Subclasses should override this if they need to generate root texts
299
after fetching weave texts.
303
def inventory_fetch_order(self):
304
return self.to_repository._fetch_order
306
def delta_on_metadata(self):
307
src_serializer = self.from_repository._format._serializer
308
target_serializer = self.to_repository._format._serializer
309
return (self.to_repository._fetch_uses_deltas and
310
src_serializer == target_serializer)
179
313
class Inter1and2Helper(object):
243
380
# yet, and are unlikely to in non-rich-root environments anyway.
244
381
root_id_order.sort(key=operator.itemgetter(0))
245
382
# Create a record stream containing the roots to create.
247
# XXX: not covered by tests, should have a flag to always run
248
# this. -- mbp 20100129
249
graph = self.source_repo.get_known_graph_ancestry(revs)
250
new_roots_stream = _new_root_data_stream(
251
root_id_order, rev_id_to_root_id, parent_map, self.source, graph)
252
return [('texts', new_roots_stream)]
255
def _get_rich_root_heads_graph(source_repo, revision_ids):
256
"""Get a Graph object suitable for asking heads() for new rich roots."""
260
def _new_root_data_stream(
261
root_keys_to_create, rev_id_to_root_id_map, parent_map, repo, graph=None):
262
"""Generate a texts substream of synthesised root entries.
264
Used in fetches that do rich-root upgrades.
266
:param root_keys_to_create: iterable of (root_id, rev_id) pairs describing
267
the root entries to create.
268
:param rev_id_to_root_id_map: dict of known rev_id -> root_id mappings for
269
calculating the parents. If a parent rev_id is not found here then it
270
will be recalculated.
271
:param parent_map: a parent map for all the revisions in
273
:param graph: a graph to use instead of repo.get_graph().
275
for root_key in root_keys_to_create:
276
root_id, rev_id = root_key
277
parent_keys = _parent_keys_for_root_version(
278
root_id, rev_id, rev_id_to_root_id_map, parent_map, repo, graph)
279
yield versionedfile.FulltextContentFactory(
280
root_key, parent_keys, None, '')
283
def _parent_keys_for_root_version(
284
root_id, rev_id, rev_id_to_root_id_map, parent_map, repo, graph=None):
285
"""Get the parent keys for a given root id.
287
A helper function for _new_root_data_stream.
289
# Include direct parents of the revision, but only if they used the same
290
# root_id and are heads.
291
rev_parents = parent_map[rev_id]
293
for parent_id in rev_parents:
294
if parent_id == NULL_REVISION:
296
if parent_id not in rev_id_to_root_id_map:
297
# We probably didn't read this revision, go spend the extra effort
300
tree = repo.revision_tree(parent_id)
301
except errors.NoSuchRevision:
302
# Ghost, fill out rev_id_to_root_id in case we encounter this
304
# But set parent_root_id to None since we don't really know
305
parent_root_id = None
307
parent_root_id = tree.get_root_id()
308
rev_id_to_root_id_map[parent_id] = None
310
# rev_id_to_root_id_map[parent_id] = parent_root_id
311
# memory consumption maybe?
313
parent_root_id = rev_id_to_root_id_map[parent_id]
314
if root_id == parent_root_id:
315
# With stacking we _might_ want to refer to a non-local revision,
316
# but this code path only applies when we have the full content
317
# available, so ghosts really are ghosts, not just the edge of
319
parent_ids.append(parent_id)
321
# root_id may be in the parent anyway.
323
tree = repo.revision_tree(parent_id)
324
except errors.NoSuchRevision:
325
# ghost, can't refer to it.
329
parent_ids.append(tree.inventory[root_id].revision)
330
except errors.NoSuchId:
333
# Drop non-head parents
335
graph = repo.get_graph()
336
heads = graph.heads(parent_ids)
338
for parent_id in parent_ids:
339
if parent_id in heads and parent_id not in selected_ids:
340
selected_ids.append(parent_id)
341
parent_keys = [(root_id, parent_id) for parent_id in selected_ids]
384
for key in root_id_order:
385
root_id, rev_id = key
386
rev_parents = parent_map[rev_id]
387
# We drop revision parents with different file-ids, because
388
# that represents a rename of the root to a different location
389
# - its not actually a parent for us. (We could look for that
390
# file id in the revision tree at considerably more expense,
391
# but for now this is sufficient (and reconcile will catch and
392
# correct this anyway).
393
# When a parent revision is a ghost, we guess that its root id
394
# was unchanged (rather than trimming it from the parent list).
395
parent_keys = tuple((root_id, parent) for parent in rev_parents
396
if parent != NULL_REVISION and
397
rev_id_to_root_id.get(parent, root_id) == root_id)
398
yield FulltextContentFactory(key, parent_keys, None, '')
399
return [('texts', yield_roots())]
402
class Model1toKnit2Fetcher(RepoFetcher):
403
"""Fetch from a Model1 repository into a Knit2 repository
405
def __init__(self, to_repository, from_repository, last_revision=None,
406
pb=None, find_ghosts=True):
407
self.helper = Inter1and2Helper(from_repository)
408
RepoFetcher.__init__(self, to_repository, from_repository,
409
last_revision, pb, find_ghosts)
411
def _generate_root_texts(self, revs):
412
return self.helper.generate_root_texts(revs)
414
def inventory_fetch_order(self):
417
Knit1to2Fetcher = Model1toKnit2Fetcher