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 finally actually join
28
from bzrlib.lazy_import import lazy_import
29
lazy_import(globals(), """
35
import bzrlib.errors as errors
36
from bzrlib.errors import (InstallFailed,
38
from bzrlib.progress import ProgressPhase
40
39
from bzrlib.revision import NULL_REVISION
40
from bzrlib.symbol_versioning import (deprecated_function,
41
44
from bzrlib.trace import mutter
47
from bzrlib.lazy_import import lazy_import
49
# TODO: Avoid repeatedly opening weaves so many times.
51
# XXX: This doesn't handle ghost (not present in branch) revisions at
52
# all yet. I'm not sure they really should be supported.
54
# NOTE: This doesn't copy revisions which may be present but not
55
# merged into the last revision. I'm not sure we want to do that.
57
# - get a list of revisions that need to be pulled in
58
# - for each one, pull in that revision file
59
# and get the inventory, and store the inventory with right
61
# - and get the ancestry, and store that with right parents too
62
# - and keep a note of all file ids and version seen
63
# - then go through all files; for each one get the weave,
64
# and add in all file versions
67
@deprecated_function(zero_eight)
68
def greedy_fetch(to_branch, from_branch, revision=None, pb=None):
69
"""Legacy API, please see branch.fetch(from_branch, last_revision, pb)."""
70
f = Fetcher(to_branch, from_branch, revision, pb)
71
return f.count_copied, f.failed_revisions
44
76
class RepoFetcher(object):
45
77
"""Pull revisions and texts from one repository to another.
47
This should not be used directly, it's essential a object to encapsulate
80
if set, try to limit to the data this revision references.
83
count_copied -- number of revisions copied
85
This should not be used directory, its essential a object to encapsulate
48
86
the logic in InterRepository.fetch().
51
def __init__(self, to_repository, from_repository, last_revision=None,
52
find_ghosts=True, fetch_spec=None):
53
"""Create a repo fetcher.
55
:param last_revision: If set, try to limit to the data this revision
57
:param fetch_spec: A SearchResult specifying which revisions to fetch.
58
If set, this overrides last_revision.
59
:param find_ghosts: If True search the entire history for ghosts.
61
# repository.fetch has the responsibility for short-circuiting
62
# attempts to copy between a repository and itself.
88
def __init__(self, to_repository, from_repository, last_revision=None, pb=None):
90
self.failed_revisions = []
92
if to_repository.control_files._transport.base == from_repository.control_files._transport.base:
93
# check that last_revision is in 'from' and then return a no-operation.
94
if last_revision not in (None, NULL_REVISION):
95
from_repository.get_revision(last_revision)
63
97
self.to_repository = to_repository
64
98
self.from_repository = from_repository
65
self.sink = to_repository._get_sink()
66
99
# must not mutate self._last_revision as its potentially a shared instance
67
100
self._last_revision = last_revision
68
self._fetch_spec = fetch_spec
69
self.find_ghosts = find_ghosts
102
self.pb = bzrlib.ui.ui_factory.nested_progress_bar()
103
self.nested_pb = self.pb
106
self.nested_pb = None
70
107
self.from_repository.lock_read()
71
mutter("Using fetch logic to copy between %s(%s) and %s(%s)",
72
self.from_repository, self.from_repository._format,
73
self.to_repository, self.to_repository._format)
109
self.to_repository.lock_write()
113
if self.nested_pb is not None:
114
self.nested_pb.finished()
115
self.to_repository.unlock()
77
117
self.from_repository.unlock()
79
119
def __fetch(self):
80
120
"""Primary worker function.
82
This initialises all the needed variables, and then fetches the
122
This initialises all the needed variables, and then fetches the
83
123
requested revisions, finally clearing the progress bar.
85
# Roughly this is what we're aiming for fetch to become:
87
# missing = self.sink.insert_stream(self.source.get_stream(search))
89
# missing = self.sink.insert_stream(self.source.get_items(missing))
125
self.to_weaves = self.to_repository.weave_store
126
self.to_control = self.to_repository.control_weaves
127
self.from_weaves = self.from_repository.weave_store
128
self.from_control = self.from_repository.control_weaves
91
129
self.count_total = 0
92
130
self.file_ids_names = {}
93
pb = ui.ui_factory.nested_progress_bar()
94
pb.show_pct = pb.show_count = False
96
pb.update("Finding revisions", 0, 2)
97
search_result = self._revids_to_fetch()
98
mutter('fetching: %s', search_result)
99
if search_result.is_empty():
101
pb.update("Fetching revisions", 1, 2)
102
self._fetch_everything_for_search(search_result)
106
def _fetch_everything_for_search(self, search):
107
"""Fetch all data for the given set of revisions."""
108
# The first phase is "file". We pass the progress bar for it directly
109
# into item_keys_introduced_by, which has more information about how
110
# that phase is progressing than we do. Progress updates for the other
111
# phases are taken care of in this function.
112
# XXX: there should be a clear owner of the progress reporting. Perhaps
113
# item_keys_introduced_by should have a richer API than it does at the
114
# moment, so that it can feed the progress information back to this
116
if (self.from_repository._format.rich_root_data and
117
not self.to_repository._format.rich_root_data):
118
raise errors.IncompatibleRepositories(
119
self.from_repository, self.to_repository,
120
"different rich-root support")
121
pb = ui.ui_factory.nested_progress_bar()
123
pb.update("Get stream source")
124
source = self.from_repository._get_source(
125
self.to_repository._format)
126
stream = source.get_stream(search)
127
from_format = self.from_repository._format
128
pb.update("Inserting stream")
129
resume_tokens, missing_keys = self.sink.insert_stream(
130
stream, from_format, [])
132
pb.update("Missing keys")
133
stream = source.get_stream_for_missing_keys(missing_keys)
134
pb.update("Inserting missing keys")
135
resume_tokens, missing_keys = self.sink.insert_stream(
136
stream, from_format, resume_tokens)
138
raise AssertionError(
139
"second push failed to complete a fetch %r." % (
142
raise AssertionError(
143
"second push failed to commit the fetch %r." % (
145
pb.update("Finishing stream")
131
pp = ProgressPhase('Fetch phase', 4, self.pb)
134
revs = self._revids_to_fetch()
138
self._fetch_weave_texts(revs)
140
self._fetch_inventory_weave(revs)
142
self._fetch_revision_texts(revs)
143
self.count_copied += len(revs)
150
147
def _revids_to_fetch(self):
151
"""Determines the exact revisions needed from self.from_repository to
152
install self._last_revision in self.to_repository.
154
:returns: A SearchResult of some sort. (Possibly a
155
PendingAncestryResult, EmptySearchResult, etc.)
157
if self._fetch_spec is not None:
158
# The fetch spec is already a concrete search result.
159
return self._fetch_spec
160
elif self._last_revision == NULL_REVISION:
161
# fetch_spec is None + last_revision is null => empty fetch.
148
mutter('fetch up to rev {%s}', self._last_revision)
149
if self._last_revision is NULL_REVISION:
162
150
# explicit limit of no revisions needed
163
return _mod_graph.EmptySearchResult()
164
elif self._last_revision is not None:
165
return _mod_graph.NotInOtherForRevs(self.to_repository,
166
self.from_repository, [self._last_revision],
167
find_ghosts=self.find_ghosts).execute()
168
else: # self._last_revision is None:
169
return _mod_graph.EverythingNotInOther(self.to_repository,
170
self.from_repository,
171
find_ghosts=self.find_ghosts).execute()
152
if (self._last_revision is not None and
153
self.to_repository.has_revision(self._last_revision)):
157
return self.to_repository.missing_revision_ids(self.from_repository,
159
except errors.NoSuchRevision:
160
raise InstallFailed([self._last_revision])
162
def _fetch_weave_texts(self, revs):
163
texts_pb = bzrlib.ui.ui_factory.nested_progress_bar()
165
# fileids_altered_by_revision_ids requires reading the inventory
166
# weave, we will need to read the inventory weave again when
167
# all this is done, so enable caching for that specific weave
168
inv_w = self.from_repository.get_inventory_weave()
170
file_ids = self.from_repository.fileids_altered_by_revision_ids(revs)
172
num_file_ids = len(file_ids)
173
for file_id, required_versions in file_ids.items():
174
texts_pb.update("fetch texts", count, num_file_ids)
176
to_weave = self.to_weaves.get_weave_or_empty(file_id,
177
self.to_repository.get_transaction())
178
from_weave = self.from_weaves.get_weave(file_id,
179
self.from_repository.get_transaction())
180
# we fetch all the texts, because texts do
181
# not reference anything, and its cheap enough
182
to_weave.join(from_weave, version_ids=required_versions)
183
# we don't need *all* of this data anymore, but we dont know
184
# what we do. This cache clearing will result in a new read
185
# of the knit data when we do the checkout, but probably we
186
# want to emit the needed data on the fly rather than at the
188
# the from weave should know not to cache data being joined,
189
# but its ok to ask it to clear.
190
from_weave.clear_cache()
191
to_weave.clear_cache()
195
def _fetch_inventory_weave(self, revs):
196
pb = bzrlib.ui.ui_factory.nested_progress_bar()
198
pb.update("fetch inventory", 0, 2)
199
to_weave = self.to_control.get_weave('inventory',
200
self.to_repository.get_transaction())
202
child_pb = bzrlib.ui.ui_factory.nested_progress_bar()
204
# just merge, this is optimisable and its means we don't
205
# copy unreferenced data such as not-needed inventories.
206
pb.update("fetch inventory", 1, 3)
207
from_weave = self.from_repository.get_inventory_weave()
208
pb.update("fetch inventory", 2, 3)
209
# 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
to_weave.join(from_weave, pb=child_pb, msg='merge inventory',
215
from_weave.clear_cache()
222
class GenericRepoFetcher(RepoFetcher):
223
"""This is a generic repo to repo fetcher.
225
This makes minimal assumptions about repo layout and contents.
226
It triggers a reconciliation after fetching to ensure integrity.
229
def _fetch_revision_texts(self, revs):
230
"""Fetch revision object texts"""
231
rev_pb = bzrlib.ui.ui_factory.nested_progress_bar()
233
to_txn = self.to_transaction = self.to_repository.get_transaction()
236
to_store = self.to_repository._revision_store
238
pb = bzrlib.ui.ui_factory.nested_progress_bar()
240
pb.update('copying revisions', count, total)
242
sig_text = self.from_repository.get_signature_text(rev)
243
to_store.add_revision_signature_text(rev, sig_text, to_txn)
244
except errors.NoSuchRevision:
247
to_store.add_revision(self.from_repository.get_revision(rev),
252
# fixup inventory if needed:
253
# this is expensive because we have no inverse index to current ghosts.
254
# but on local disk its a few seconds and sftp push is already insane.
256
# FIXME: repository should inform if this is needed.
257
self.to_repository.reconcile()
262
class KnitRepoFetcher(RepoFetcher):
263
"""This is a knit format repository specific fetcher.
265
This differs from the GenericRepoFetcher by not doing a
266
reconciliation after copying, and using knit joining to
270
def _fetch_revision_texts(self, revs):
271
# may need to be a InterRevisionStore call here.
272
from_transaction = self.from_repository.get_transaction()
273
to_transaction = self.to_repository.get_transaction()
274
to_sf = self.to_repository._revision_store.get_signature_file(
276
from_sf = self.from_repository._revision_store.get_signature_file(
278
to_sf.join(from_sf, version_ids=revs, ignore_missing=True)
279
to_rf = self.to_repository._revision_store.get_revision_file(
281
from_rf = self.from_repository._revision_store.get_revision_file(
283
to_rf.join(from_rf, version_ids=revs)
174
286
class Inter1and2Helper(object):
175
287
"""Helper for operations that convert data from model 1 and 2
177
289
This is for use by fetchers and converters.
180
# This is a class variable so that the test suite can override it.
181
known_graph_threshold = 100
183
def __init__(self, source):
292
def __init__(self, source, target):
186
295
:param source: The repository data comes from
296
:param target: The repository data goes to
188
298
self.source = source
190
301
def iter_rev_trees(self, revs):
191
302
"""Iterate through RevisionTrees efficiently.
207
316
revs = revs[100:]
209
def _find_root_ids(self, revs, parent_map, graph):
211
for tree in self.iter_rev_trees(revs):
212
revision_id = tree.inventory.root.revision
213
root_id = tree.get_root_id()
214
revision_root[revision_id] = root_id
215
# Find out which parents we don't already know root ids for
217
for revision_parents in parent_map.itervalues():
218
parents.update(revision_parents)
219
parents.difference_update(revision_root.keys() + [NULL_REVISION])
220
# Limit to revisions present in the versionedfile
221
parents = graph.get_parent_map(parents).keys()
222
for tree in self.iter_rev_trees(parents):
223
root_id = tree.get_root_id()
224
revision_root[tree.get_revision_id()] = root_id
227
318
def generate_root_texts(self, revs):
228
319
"""Generate VersionedFiles for all root ids.
230
321
:param revs: the revisions to include
232
graph = self.source.get_graph()
233
parent_map = graph.get_parent_map(revs)
234
rev_order = tsort.topo_sort(parent_map)
235
rev_id_to_root_id = self._find_root_ids(revs, parent_map, graph)
236
root_id_order = [(rev_id_to_root_id[rev_id], rev_id) for rev_id in
238
# Guaranteed stable, this groups all the file id operations together
239
# retaining topological order within the revisions of a file id.
240
# File id splits and joins would invalidate this, but they don't exist
241
# yet, and are unlikely to in non-rich-root environments anyway.
242
root_id_order.sort(key=operator.itemgetter(0))
243
# Create a record stream containing the roots to create.
244
if len(revs) > self.known_graph_threshold:
245
graph = self.source.get_known_graph_ancestry(revs)
246
new_roots_stream = _new_root_data_stream(
247
root_id_order, rev_id_to_root_id, parent_map, self.source, graph)
248
return [('texts', new_roots_stream)]
251
def _new_root_data_stream(
252
root_keys_to_create, rev_id_to_root_id_map, parent_map, repo, graph=None):
253
"""Generate a texts substream of synthesised root entries.
255
Used in fetches that do rich-root upgrades.
257
:param root_keys_to_create: iterable of (root_id, rev_id) pairs describing
258
the root entries to create.
259
:param rev_id_to_root_id_map: dict of known rev_id -> root_id mappings for
260
calculating the parents. If a parent rev_id is not found here then it
261
will be recalculated.
262
:param parent_map: a parent map for all the revisions in
264
:param graph: a graph to use instead of repo.get_graph().
266
for root_key in root_keys_to_create:
267
root_id, rev_id = root_key
268
parent_keys = _parent_keys_for_root_version(
269
root_id, rev_id, rev_id_to_root_id_map, parent_map, repo, graph)
270
yield versionedfile.FulltextContentFactory(
271
root_key, parent_keys, None, '')
274
def _parent_keys_for_root_version(
275
root_id, rev_id, rev_id_to_root_id_map, parent_map, repo, graph=None):
276
"""Get the parent keys for a given root id.
278
A helper function for _new_root_data_stream.
280
# Include direct parents of the revision, but only if they used the same
281
# root_id and are heads.
282
rev_parents = parent_map[rev_id]
284
for parent_id in rev_parents:
285
if parent_id == NULL_REVISION:
287
if parent_id not in rev_id_to_root_id_map:
288
# We probably didn't read this revision, go spend the extra effort
291
tree = repo.revision_tree(parent_id)
292
except errors.NoSuchRevision:
293
# Ghost, fill out rev_id_to_root_id in case we encounter this
295
# But set parent_root_id to None since we don't really know
296
parent_root_id = None
298
parent_root_id = tree.get_root_id()
299
rev_id_to_root_id_map[parent_id] = None
301
# rev_id_to_root_id_map[parent_id] = parent_root_id
302
# memory consumption maybe?
304
parent_root_id = rev_id_to_root_id_map[parent_id]
305
if root_id == parent_root_id:
306
# With stacking we _might_ want to refer to a non-local revision,
307
# but this code path only applies when we have the full content
308
# available, so ghosts really are ghosts, not just the edge of
310
parent_ids.append(parent_id)
312
# root_id may be in the parent anyway.
314
tree = repo.revision_tree(parent_id)
315
except errors.NoSuchRevision:
316
# ghost, can't refer to it.
320
parent_ids.append(tree.get_file_revision(root_id))
321
except errors.NoSuchId:
324
# Drop non-head parents
326
graph = repo.get_graph()
327
heads = graph.heads(parent_ids)
329
for parent_id in parent_ids:
330
if parent_id in heads and parent_id not in selected_ids:
331
selected_ids.append(parent_id)
332
parent_keys = [(root_id, parent_id) for parent_id in selected_ids]
336
class TargetRepoKinds(object):
337
"""An enum-like set of constants.
339
They are the possible values of FetchSpecFactory.target_repo_kinds.
342
PREEXISTING = 'preexisting'
347
class FetchSpecFactory(object):
348
"""A helper for building the best fetch spec for a sprout call.
350
Factors that go into determining the sort of fetch to perform:
351
* did the caller specify any revision IDs?
352
* did the caller specify a source branch (need to fetch its
353
heads_to_fetch(), usually the tip + tags)
354
* is there an existing target repo (don't need to refetch revs it
356
* target is stacked? (similar to pre-existing target repo: even if
357
the target itself is new don't want to refetch existing revs)
359
:ivar source_branch: the source branch if one specified, else None.
360
:ivar source_branch_stop_revision_id: fetch up to this revision of
361
source_branch, rather than its tip.
362
:ivar source_repo: the source repository if one found, else None.
363
:ivar target_repo: the target repository acquired by sprout.
364
:ivar target_repo_kind: one of the TargetRepoKinds constants.
368
self._explicit_rev_ids = set()
369
self.source_branch = None
370
self.source_branch_stop_revision_id = None
371
self.source_repo = None
372
self.target_repo = None
373
self.target_repo_kind = None
376
def add_revision_ids(self, revision_ids):
377
"""Add revision_ids to the set of revision_ids to be fetched."""
378
self._explicit_rev_ids.update(revision_ids)
380
def make_fetch_spec(self):
381
"""Build a SearchResult or PendingAncestryResult or etc."""
382
if self.target_repo_kind is None or self.source_repo is None:
383
raise AssertionError(
384
'Incomplete FetchSpecFactory: %r' % (self.__dict__,))
385
if len(self._explicit_rev_ids) == 0 and self.source_branch is None:
386
if self.limit is not None:
387
raise NotImplementedError(
388
"limit is only supported with a source branch set")
389
# Caller hasn't specified any revisions or source branch
390
if self.target_repo_kind == TargetRepoKinds.EMPTY:
391
return _mod_graph.EverythingResult(self.source_repo)
393
# We want everything not already in the target (or target's
395
return _mod_graph.EverythingNotInOther(
396
self.target_repo, self.source_repo).execute()
397
heads_to_fetch = set(self._explicit_rev_ids)
398
if self.source_branch is not None:
399
must_fetch, if_present_fetch = self.source_branch.heads_to_fetch()
400
if self.source_branch_stop_revision_id is not None:
401
# Replace the tip rev from must_fetch with the stop revision
402
# XXX: this might be wrong if the tip rev is also in the
403
# must_fetch set for other reasons (e.g. it's the tip of
404
# multiple loom threads?), but then it's pretty unclear what it
405
# should mean to specify a stop_revision in that case anyway.
406
must_fetch.discard(self.source_branch.last_revision())
407
must_fetch.add(self.source_branch_stop_revision_id)
408
heads_to_fetch.update(must_fetch)
410
if_present_fetch = set()
411
if self.target_repo_kind == TargetRepoKinds.EMPTY:
412
# PendingAncestryResult does not raise errors if a requested head
413
# is absent. Ideally it would support the
414
# required_ids/if_present_ids distinction, but in practice
415
# heads_to_fetch will almost certainly be present so this doesn't
417
all_heads = heads_to_fetch.union(if_present_fetch)
418
ret = _mod_graph.PendingAncestryResult(all_heads, self.source_repo)
419
if self.limit is not None:
420
graph = self.source_repo.get_graph()
421
topo_order = list(graph.iter_topo_order(ret.get_keys()))
422
result_set = topo_order[:self.limit]
423
ret = self.source_repo.revision_ids_to_search_result(result_set)
426
return _mod_graph.NotInOtherForRevs(self.target_repo, self.source_repo,
427
required_ids=heads_to_fetch, if_present_ids=if_present_fetch,
428
limit=self.limit).execute()
323
inventory_weave = self.source.get_inventory_weave()
326
to_store = self.target.weave_store
327
for tree in self.iter_rev_trees(revs):
328
revision_id = tree.inventory.root.revision
329
root_id = tree.inventory.root.file_id
330
parents = inventory_weave.get_parents(revision_id)
331
if root_id not in versionedfile:
332
versionedfile[root_id] = to_store.get_weave_or_empty(root_id,
333
self.target.get_transaction())
334
parent_texts[root_id] = versionedfile[root_id].add_lines(
335
revision_id, parents, [], parent_texts)
337
def regenerate_inventory(self, revs):
338
"""Generate a new inventory versionedfile in target, convertin data.
340
The inventory is retrieved from the source, (deserializing it), and
341
stored in the target (reserializing it in a different format).
342
:param revs: The revisions to include
344
inventory_weave = self.source.get_inventory_weave()
345
for tree in self.iter_rev_trees(revs):
346
parents = inventory_weave.get_parents(tree.get_revision_id())
347
self.target.add_inventory(tree.get_revision_id(), tree.inventory,
351
class Model1toKnit2Fetcher(GenericRepoFetcher):
352
"""Fetch from a Model1 repository into a Knit2 repository
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def __init__(self, to_repository, from_repository, last_revision=None,
356
self.helper = Inter1and2Helper(from_repository, to_repository)
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GenericRepoFetcher.__init__(self, to_repository, from_repository,
360
def _fetch_weave_texts(self, revs):
361
GenericRepoFetcher._fetch_weave_texts(self, revs)
362
# Now generate a weave for the tree root
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self.helper.generate_root_texts(revs)
365
def _fetch_inventory_weave(self, revs):
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self.helper.regenerate_inventory(revs)
369
class Knit1to2Fetcher(KnitRepoFetcher):
370
"""Fetch from a Knit1 repository into a Knit2 repository"""
372
def __init__(self, to_repository, from_repository, last_revision=None,
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self.helper = Inter1and2Helper(from_repository, to_repository)
375
KnitRepoFetcher.__init__(self, to_repository, from_repository,
378
def _fetch_weave_texts(self, revs):
379
KnitRepoFetcher._fetch_weave_texts(self, revs)
380
# Now generate a weave for the tree root
381
self.helper.generate_root_texts(revs)
383
def _fetch_inventory_weave(self, revs):
384
self.helper.regenerate_inventory(revs)
387
class Fetcher(object):
388
"""Backwards compatibility glue for branch.fetch()."""
390
@deprecated_method(zero_eight)
391
def __init__(self, to_branch, from_branch, last_revision=None, pb=None):
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"""Please see branch.fetch()."""
393
to_branch.fetch(from_branch, last_revision, pb)
added
removed
bzrlib/fetch.py
