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, NoSuchRevision,
38
from bzrlib.trace import mutter
39
from bzrlib.reconcile import RepoReconciler
40
40
from bzrlib.revision import NULL_REVISION
41
from bzrlib.trace import mutter
41
from bzrlib.symbol_versioning import *
44
# TODO: Avoid repeatedly opening weaves so many times.
46
# XXX: This doesn't handle ghost (not present in branch) revisions at
47
# all yet. I'm not sure they really should be supported.
49
# NOTE: This doesn't copy revisions which may be present but not
50
# merged into the last revision. I'm not sure we want to do that.
52
# - get a list of revisions that need to be pulled in
53
# - for each one, pull in that revision file
54
# and get the inventory, and store the inventory with right
56
# - and get the ancestry, and store that with right parents too
57
# - and keep a note of all file ids and version seen
58
# - then go through all files; for each one get the weave,
59
# and add in all file versions
62
@deprecated_function(zero_eight)
63
def greedy_fetch(to_branch, from_branch, revision=None, pb=None):
64
"""Legacy API, please see branch.fetch(from_branch, last_revision, pb)."""
65
f = Fetcher(to_branch, from_branch, revision, pb)
66
return f.count_copied, f.failed_revisions
44
71
class RepoFetcher(object):
45
72
"""Pull revisions and texts from one repository to another.
47
This should not be used directly, it's essential a object to encapsulate
75
if set, try to limit to the data this revision references.
78
count_copied -- number of revisions copied
80
This should not be used directory, its essential a object to encapsulate
48
81
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 find_ghosts: If True search the entire history for ghosts.
59
# repository.fetch has the responsibility for short-circuiting
60
# attempts to copy between a repository and itself.
83
def __init__(self, to_repository, from_repository, last_revision=None, pb=None):
85
self.failed_revisions = []
87
if to_repository.control_files._transport.base == from_repository.control_files._transport.base:
88
# check that last_revision is in 'from' and then return a no-operation.
89
if last_revision not in (None, NULL_REVISION):
90
from_repository.get_revision(last_revision)
61
92
self.to_repository = to_repository
62
93
self.from_repository = from_repository
63
self.sink = to_repository._get_sink()
64
94
# must not mutate self._last_revision as its potentially a shared instance
65
95
self._last_revision = last_revision
66
self._fetch_spec = fetch_spec
67
self.find_ghosts = find_ghosts
97
self.pb = bzrlib.ui.ui_factory.nested_progress_bar()
98
self.nested_pb = self.pb
101
self.nested_pb = None
68
102
self.from_repository.lock_read()
69
mutter("Using fetch logic to copy between %s(%s) and %s(%s)",
70
self.from_repository, self.from_repository._format,
71
self.to_repository, self.to_repository._format)
104
self.to_repository.lock_write()
108
if self.nested_pb is not None:
109
self.nested_pb.finished()
110
self.to_repository.unlock()
75
112
self.from_repository.unlock()
77
114
def __fetch(self):
78
115
"""Primary worker function.
80
This initialises all the needed variables, and then fetches the
117
This initialises all the needed variables, and then fetches the
81
118
requested revisions, finally clearing the progress bar.
83
# Roughly this is what we're aiming for fetch to become:
85
# missing = self.sink.insert_stream(self.source.get_stream(search))
87
# missing = self.sink.insert_stream(self.source.get_items(missing))
120
self.to_weaves = self.to_repository.weave_store
121
self.to_control = self.to_repository.control_weaves
122
self.from_weaves = self.from_repository.weave_store
123
self.from_control = self.from_repository.control_weaves
89
124
self.count_total = 0
90
125
self.file_ids_names = {}
91
pb = ui.ui_factory.nested_progress_bar()
92
pb.show_pct = pb.show_count = False
94
pb.update("Finding revisions", 0, 2)
95
search = self._revids_to_fetch()
98
pb.update("Fetching revisions", 1, 2)
99
self._fetch_everything_for_search(search)
103
def _fetch_everything_for_search(self, search):
104
"""Fetch all data for the given set of revisions."""
105
# The first phase is "file". We pass the progress bar for it directly
106
# into item_keys_introduced_by, which has more information about how
107
# that phase is progressing than we do. Progress updates for the other
108
# phases are taken care of in this function.
109
# XXX: there should be a clear owner of the progress reporting. Perhaps
110
# item_keys_introduced_by should have a richer API than it does at the
111
# moment, so that it can feed the progress information back to this
113
if (self.from_repository._format.rich_root_data and
114
not self.to_repository._format.rich_root_data):
115
raise errors.IncompatibleRepositories(
116
self.from_repository, self.to_repository,
117
"different rich-root support")
118
pb = ui.ui_factory.nested_progress_bar()
120
pb.update("Get stream source")
121
source = self.from_repository._get_source(
122
self.to_repository._format)
123
stream = source.get_stream(search)
124
from_format = self.from_repository._format
125
pb.update("Inserting stream")
126
resume_tokens, missing_keys = self.sink.insert_stream(
127
stream, from_format, [])
128
if self.to_repository._fallback_repositories:
130
self._parent_inventories(search.get_keys()))
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")
128
revs = self._revids_to_fetch()
131
self.pb.update('Fetching text', 1, self.total_steps)
132
self._fetch_weave_texts(revs)
133
self.pb.update('Fetching inventories', 2, self.total_steps)
134
self._fetch_inventory_weave(revs)
135
self.pb.update('Fetching revisions', 3, self.total_steps)
136
self._fetch_revision_texts(revs)
137
self.pb.update('Fetching revisions', 4, self.total_steps)
138
self.count_copied += len(revs)
150
142
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
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
143
self.pb.update('Calculating needed data', 0, self.total_steps)
158
144
mutter('fetch up to rev {%s}', self._last_revision)
159
145
if self._last_revision is NULL_REVISION:
160
146
# 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)
179
class Inter1and2Helper(object):
180
"""Helper for operations that convert data from model 1 and 2
182
This is for use by fetchers and converters.
185
def __init__(self, source):
188
:param source: The repository data comes from
192
def iter_rev_trees(self, revs):
193
"""Iterate through RevisionTrees efficiently.
195
Additionally, the inventory's revision_id is set if unset.
197
Trees are retrieved in batches of 100, and then yielded in the order
200
:param revs: A list of revision ids
202
# In case that revs is not a list.
205
for tree in self.source.revision_trees(revs[:100]):
206
if tree.inventory.revision_id is None:
207
tree.inventory.revision_id = tree.get_revision_id()
211
def _find_root_ids(self, revs, parent_map, graph):
213
for tree in self.iter_rev_trees(revs):
214
revision_id = tree.inventory.root.revision
215
root_id = tree.get_root_id()
216
revision_root[revision_id] = root_id
217
# Find out which parents we don't already know root ids for
219
for revision_parents in parent_map.itervalues():
220
parents.update(revision_parents)
221
parents.difference_update(revision_root.keys() + [NULL_REVISION])
222
# Limit to revisions present in the versionedfile
223
parents = graph.get_parent_map(parents).keys()
224
for tree in self.iter_rev_trees(parents):
225
root_id = tree.get_root_id()
226
revision_root[tree.get_revision_id()] = root_id
229
def generate_root_texts(self, revs):
230
"""Generate VersionedFiles for all root ids.
232
:param revs: the revisions to include
234
graph = self.source.get_graph()
235
parent_map = graph.get_parent_map(revs)
236
rev_order = tsort.topo_sort(parent_map)
237
rev_id_to_root_id = self._find_root_ids(revs, parent_map, graph)
238
root_id_order = [(rev_id_to_root_id[rev_id], rev_id) for rev_id in
240
# Guaranteed stable, this groups all the file id operations together
241
# retaining topological order within the revisions of a file id.
242
# File id splits and joins would invalidate this, but they don't exist
243
# yet, and are unlikely to in non-rich-root environments anyway.
244
root_id_order.sort(key=operator.itemgetter(0))
245
# 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.
148
if (self._last_revision != None and
149
self.to_repository.has_revision(self._last_revision)):
153
return self.to_repository.missing_revision_ids(self.from_repository,
155
except errors.NoSuchRevision:
156
raise InstallFailed([self._last_revision])
158
def _fetch_weave_texts(self, revs):
159
texts_pb = bzrlib.ui.ui_factory.nested_progress_bar()
161
file_ids = self.from_repository.fileid_involved_by_set(revs)
163
num_file_ids = len(file_ids)
164
for file_id in file_ids:
165
texts_pb.update("fetch texts", count, num_file_ids)
167
to_weave = self.to_weaves.get_weave_or_empty(file_id,
168
self.to_repository.get_transaction())
170
if to_weave.num_versions() > 0:
171
# destination has contents, must merge
172
from_weave = self.from_weaves.get_weave(file_id,
173
self.from_repository.get_transaction())
174
# we fetch all the texts, because texts do
175
# not reference anything, and its cheap enough
176
to_weave.join(from_weave)
178
# destination is empty, just copy it.
179
# this copies all the texts, which is useful and
180
# on per-file basis quite cheap.
181
self.to_weaves.copy_multi(
185
self.from_repository.get_transaction(),
186
self.to_repository.get_transaction())
190
def _fetch_inventory_weave(self, revs):
191
inv_pb = bzrlib.ui.ui_factory.nested_progress_bar()
193
inv_pb.update("fetch inventory", 0, 2)
194
to_weave = self.to_control.get_weave('inventory',
195
self.to_repository.get_transaction())
197
# just merge, this is optimisable and its means we dont
198
# copy unreferenced data such as not-needed inventories.
199
self.pb.update("fetch inventory", 1, 2)
200
from_weave = self.from_repository.get_inventory_weave()
201
self.pb.update("fetch inventory", 2, 2)
202
# we fetch only the referenced inventories because we do not
203
# know for unselected inventories whether all their required
204
# texts are present in the other repository - it could be
206
to_weave.join(from_weave, msg='fetch inventory', version_ids=revs)
211
class GenericRepoFetcher(RepoFetcher):
212
"""This is a generic repo to repo fetcher.
214
This makes minimal assumptions about repo layout and contents.
215
It triggers a reconciliation after fetching to ensure integrity.
218
def _fetch_revision_texts(self, revs):
219
rev_pb = bzrlib.ui.ui_factory.nested_progress_bar()
221
self.to_transaction = self.to_repository.get_transaction()
225
rev_pb.update('fetch revisions', count, total)
329
parent_ids.append(tree.inventory[root_id].revision)
330
except errors.NoSuchId:
227
sig_text = self.from_repository.get_signature_text(rev)
228
self.to_repository._revision_store.add_revision_signature_text(
229
rev, sig_text, self.to_transaction)
230
except errors.NoSuchRevision:
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]
233
self.to_repository._revision_store.add_revision(
234
self.from_repository.get_revision(rev),
237
rev_pb.update('copying revisions', count, total)
238
# fixup inventory if needed:
239
# this is expensive because we have no inverse index to current ghosts.
240
# but on local disk its a few seconds and sftp push is already insane.
242
# FIXME: repository should inform if this is needed.
243
self.to_repository.reconcile()
248
class KnitRepoFetcher(RepoFetcher):
249
"""This is a knit format repository specific fetcher.
251
This differs from the GenericRepoFetcher by not doing a
252
reconciliation after copying, and using knit joining to
256
def _fetch_revision_texts(self, revs):
257
# may need to be a InterRevisionStore call here.
258
from_transaction = self.from_repository.get_transaction()
259
to_transaction = self.to_repository.get_transaction()
260
to_sf = self.to_repository._revision_store.get_signature_file(
262
from_sf = self.from_repository._revision_store.get_signature_file(
264
to_sf.join(from_sf, version_ids=revs, ignore_missing=True)
265
to_rf = self.to_repository._revision_store.get_revision_file(
267
from_rf = self.from_repository._revision_store.get_revision_file(
269
to_rf.join(from_rf, version_ids=revs)
272
class Fetcher(object):
273
"""Backwards compatability glue for branch.fetch()."""
275
@deprecated_method(zero_eight)
276
def __init__(self, to_branch, from_branch, last_revision=None, pb=None):
277
"""Please see branch.fetch()."""
278
to_branch.fetch(from_branch, last_revision, pb)
added
removed
bzrlib/fetch.py
