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,
40
from bzrlib.revision import NULL_REVISION
38
41
from bzrlib.trace import mutter
39
from bzrlib.progress import ProgressBar, ProgressPhase
40
from bzrlib.reconcile import RepoReconciler
41
from bzrlib.revision import NULL_REVISION
42
from bzrlib.symbol_versioning import *
45
# TODO: Avoid repeatedly opening weaves so many times.
47
# XXX: This doesn't handle ghost (not present in branch) revisions at
48
# all yet. I'm not sure they really should be supported.
50
# NOTE: This doesn't copy revisions which may be present but not
51
# merged into the last revision. I'm not sure we want to do that.
53
# - get a list of revisions that need to be pulled in
54
# - for each one, pull in that revision file
55
# and get the inventory, and store the inventory with right
57
# - and get the ancestry, and store that with right parents too
58
# - and keep a note of all file ids and version seen
59
# - then go through all files; for each one get the weave,
60
# and add in all file versions
63
@deprecated_function(zero_eight)
64
def greedy_fetch(to_branch, from_branch, revision=None, pb=None):
65
"""Legacy API, please see branch.fetch(from_branch, last_revision, pb)."""
66
f = Fetcher(to_branch, from_branch, revision, pb)
67
return f.count_copied, f.failed_revisions
72
44
class RepoFetcher(object):
73
45
"""Pull revisions and texts from one repository to another.
76
if set, try to limit to the data this revision references.
79
count_copied -- number of revisions copied
81
This should not be used directory, its essential a object to encapsulate
47
This should not be used directly, it's essential a object to encapsulate
82
48
the logic in InterRepository.fetch().
84
def __init__(self, to_repository, from_repository, last_revision=None, pb=None):
86
self.failed_revisions = []
88
if to_repository.control_files._transport.base == from_repository.control_files._transport.base:
89
# check that last_revision is in 'from' and then return a no-operation.
90
if last_revision not in (None, NULL_REVISION):
91
from_repository.get_revision(last_revision)
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.
93
61
self.to_repository = to_repository
94
62
self.from_repository = from_repository
63
self.sink = to_repository._get_sink()
95
64
# must not mutate self._last_revision as its potentially a shared instance
96
65
self._last_revision = last_revision
98
self.pb = bzrlib.ui.ui_factory.nested_progress_bar()
99
self.nested_pb = self.pb
102
self.nested_pb = None
66
self._fetch_spec = fetch_spec
67
self.find_ghosts = find_ghosts
103
68
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)
105
self.to_repository.lock_write()
109
if self.nested_pb is not None:
110
self.nested_pb.finished()
111
self.to_repository.unlock()
113
75
self.from_repository.unlock()
115
77
def __fetch(self):
116
78
"""Primary worker function.
118
This initialises all the needed variables, and then fetches the
80
This initialises all the needed variables, and then fetches the
119
81
requested revisions, finally clearing the progress bar.
121
self.to_weaves = self.to_repository.weave_store
122
self.to_control = self.to_repository.control_weaves
123
self.from_weaves = self.from_repository.weave_store
124
self.from_control = self.from_repository.control_weaves
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))
125
89
self.count_total = 0
126
90
self.file_ids_names = {}
127
pp = ProgressPhase('fetch phase', 4, self.pb)
129
revs = self._revids_to_fetch()
133
self._fetch_weave_texts(revs)
135
self._fetch_inventory_weave(revs)
137
self._fetch_revision_texts(revs)
138
self.count_copied += len(revs)
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, [])
129
pb.update("Missing keys")
130
stream = source.get_stream_for_missing_keys(missing_keys)
131
pb.update("Inserting missing keys")
132
resume_tokens, missing_keys = self.sink.insert_stream(
133
stream, from_format, resume_tokens)
135
raise AssertionError(
136
"second push failed to complete a fetch %r." % (
139
raise AssertionError(
140
"second push failed to commit the fetch %r." % (
142
pb.update("Finishing stream")
142
147
def _revids_to_fetch(self):
148
"""Determines the exact revisions needed from self.from_repository to
149
install self._last_revision in self.to_repository.
151
If no revisions need to be fetched, then this just returns None.
153
if self._fetch_spec is not None:
154
return self._fetch_spec
143
155
mutter('fetch up to rev {%s}', self._last_revision)
144
156
if self._last_revision is NULL_REVISION:
145
157
# explicit limit of no revisions needed
147
if (self._last_revision != None and
148
self.to_repository.has_revision(self._last_revision)):
152
return self.to_repository.missing_revision_ids(self.from_repository,
154
except errors.NoSuchRevision:
155
raise InstallFailed([self._last_revision])
157
def _fetch_weave_texts(self, revs):
158
texts_pb = bzrlib.ui.ui_factory.nested_progress_bar()
160
file_ids = self.from_repository.fileid_involved_by_set(revs)
162
num_file_ids = len(file_ids)
163
for file_id in file_ids:
164
texts_pb.update("fetch texts", count, num_file_ids)
167
to_weave = self.to_weaves.get_weave(file_id,
168
self.to_repository.get_transaction())
169
except errors.NoSuchFile:
170
# destination is empty, just copy it.
171
# this copies all the texts, which is useful and
172
# on per-file basis quite cheap.
173
self.to_weaves.copy_multi(
177
self.from_repository.get_transaction(),
178
self.to_repository.get_transaction())
180
# destination has contents, must merge
181
from_weave = self.from_weaves.get_weave(file_id,
182
self.from_repository.get_transaction())
183
# we fetch all the texts, because texts do
184
# not reference anything, and its cheap enough
185
to_weave.join(from_weave)
189
def _fetch_inventory_weave(self, revs):
190
pb = bzrlib.ui.ui_factory.nested_progress_bar()
192
pb.update("fetch inventory", 0, 2)
193
to_weave = self.to_control.get_weave('inventory',
194
self.to_repository.get_transaction())
196
child_pb = bzrlib.ui.ui_factory.nested_progress_bar()
198
# just merge, this is optimisable and its means we dont
199
# copy unreferenced data such as not-needed inventories.
200
pb.update("fetch inventory", 1, 3)
201
from_weave = self.from_repository.get_inventory_weave()
202
pb.update("fetch inventory", 2, 3)
203
# we fetch only the referenced inventories because we do not
204
# know for unselected inventories whether all their required
205
# texts are present in the other repository - it could be
207
to_weave.join(from_weave, pb=child_pb, msg='merge inventory',
215
class GenericRepoFetcher(RepoFetcher):
216
"""This is a generic repo to repo fetcher.
218
This makes minimal assumptions about repo layout and contents.
219
It triggers a reconciliation after fetching to ensure integrity.
222
def _fetch_revision_texts(self, revs):
223
"""Fetch revision object texts"""
224
rev_pb = bzrlib.ui.ui_factory.nested_progress_bar()
226
to_txn = self.to_transaction = self.to_repository.get_transaction()
229
to_store = self.to_repository._revision_store
231
pb = bzrlib.ui.ui_factory.nested_progress_bar()
233
pb.update('copying revisions', count, total)
235
sig_text = self.from_repository.get_signature_text(rev)
236
to_store.add_revision_signature_text(rev, sig_text, to_txn)
237
except errors.NoSuchRevision:
240
to_store.add_revision(self.from_repository.get_revision(rev),
245
# fixup inventory if needed:
246
# this is expensive because we have no inverse index to current ghosts.
247
# but on local disk its a few seconds and sftp push is already insane.
249
# FIXME: repository should inform if this is needed.
250
self.to_repository.reconcile()
255
class KnitRepoFetcher(RepoFetcher):
256
"""This is a knit format repository specific fetcher.
258
This differs from the GenericRepoFetcher by not doing a
259
reconciliation after copying, and using knit joining to
263
def _fetch_revision_texts(self, revs):
264
# may need to be a InterRevisionStore call here.
265
from_transaction = self.from_repository.get_transaction()
266
to_transaction = self.to_repository.get_transaction()
267
to_sf = self.to_repository._revision_store.get_signature_file(
269
from_sf = self.from_repository._revision_store.get_signature_file(
271
to_sf.join(from_sf, version_ids=revs, ignore_missing=True)
272
to_rf = self.to_repository._revision_store.get_revision_file(
274
from_rf = self.from_repository._revision_store.get_revision_file(
276
to_rf.join(from_rf, version_ids=revs)
279
class Fetcher(object):
280
"""Backwards compatability glue for branch.fetch()."""
282
@deprecated_method(zero_eight)
283
def __init__(self, to_branch, from_branch, last_revision=None, pb=None):
284
"""Please see branch.fetch()."""
285
to_branch.fetch(from_branch, last_revision, pb)
159
return self.to_repository.search_missing_revision_ids(
160
self.from_repository, self._last_revision,
161
find_ghosts=self.find_ghosts)
164
class Inter1and2Helper(object):
165
"""Helper for operations that convert data from model 1 and 2
167
This is for use by fetchers and converters.
170
# This is a class variable so that the test suite can override it.
171
known_graph_threshold = 100
173
def __init__(self, source):
176
:param source: The repository data comes from
180
def iter_rev_trees(self, revs):
181
"""Iterate through RevisionTrees efficiently.
183
Additionally, the inventory's revision_id is set if unset.
185
Trees are retrieved in batches of 100, and then yielded in the order
188
:param revs: A list of revision ids
190
# In case that revs is not a list.
193
for tree in self.source.revision_trees(revs[:100]):
194
if tree.inventory.revision_id is None:
195
tree.inventory.revision_id = tree.get_revision_id()
199
def _find_root_ids(self, revs, parent_map, graph):
201
for tree in self.iter_rev_trees(revs):
202
revision_id = tree.inventory.root.revision
203
root_id = tree.get_root_id()
204
revision_root[revision_id] = root_id
205
# Find out which parents we don't already know root ids for
207
for revision_parents in parent_map.itervalues():
208
parents.update(revision_parents)
209
parents.difference_update(revision_root.keys() + [NULL_REVISION])
210
# Limit to revisions present in the versionedfile
211
parents = graph.get_parent_map(parents).keys()
212
for tree in self.iter_rev_trees(parents):
213
root_id = tree.get_root_id()
214
revision_root[tree.get_revision_id()] = root_id
217
def generate_root_texts(self, revs):
218
"""Generate VersionedFiles for all root ids.
220
:param revs: the revisions to include
222
graph = self.source.get_graph()
223
parent_map = graph.get_parent_map(revs)
224
rev_order = tsort.topo_sort(parent_map)
225
rev_id_to_root_id = self._find_root_ids(revs, parent_map, graph)
226
root_id_order = [(rev_id_to_root_id[rev_id], rev_id) for rev_id in
228
# Guaranteed stable, this groups all the file id operations together
229
# retaining topological order within the revisions of a file id.
230
# File id splits and joins would invalidate this, but they don't exist
231
# yet, and are unlikely to in non-rich-root environments anyway.
232
root_id_order.sort(key=operator.itemgetter(0))
233
# Create a record stream containing the roots to create.
234
if len(revs) > self.known_graph_threshold:
235
graph = self.source.get_known_graph_ancestry(revs)
236
new_roots_stream = _new_root_data_stream(
237
root_id_order, rev_id_to_root_id, parent_map, self.source, graph)
238
return [('texts', new_roots_stream)]
241
def _new_root_data_stream(
242
root_keys_to_create, rev_id_to_root_id_map, parent_map, repo, graph=None):
243
"""Generate a texts substream of synthesised root entries.
245
Used in fetches that do rich-root upgrades.
247
:param root_keys_to_create: iterable of (root_id, rev_id) pairs describing
248
the root entries to create.
249
:param rev_id_to_root_id_map: dict of known rev_id -> root_id mappings for
250
calculating the parents. If a parent rev_id is not found here then it
251
will be recalculated.
252
:param parent_map: a parent map for all the revisions in
254
:param graph: a graph to use instead of repo.get_graph().
256
for root_key in root_keys_to_create:
257
root_id, rev_id = root_key
258
parent_keys = _parent_keys_for_root_version(
259
root_id, rev_id, rev_id_to_root_id_map, parent_map, repo, graph)
260
yield versionedfile.FulltextContentFactory(
261
root_key, parent_keys, None, '')
264
def _parent_keys_for_root_version(
265
root_id, rev_id, rev_id_to_root_id_map, parent_map, repo, graph=None):
266
"""Get the parent keys for a given root id.
268
A helper function for _new_root_data_stream.
270
# Include direct parents of the revision, but only if they used the same
271
# root_id and are heads.
272
rev_parents = parent_map[rev_id]
274
for parent_id in rev_parents:
275
if parent_id == NULL_REVISION:
277
if parent_id not in rev_id_to_root_id_map:
278
# We probably didn't read this revision, go spend the extra effort
281
tree = repo.revision_tree(parent_id)
282
except errors.NoSuchRevision:
283
# Ghost, fill out rev_id_to_root_id in case we encounter this
285
# But set parent_root_id to None since we don't really know
286
parent_root_id = None
288
parent_root_id = tree.get_root_id()
289
rev_id_to_root_id_map[parent_id] = None
291
# rev_id_to_root_id_map[parent_id] = parent_root_id
292
# memory consumption maybe?
294
parent_root_id = rev_id_to_root_id_map[parent_id]
295
if root_id == parent_root_id:
296
# With stacking we _might_ want to refer to a non-local revision,
297
# but this code path only applies when we have the full content
298
# available, so ghosts really are ghosts, not just the edge of
300
parent_ids.append(parent_id)
302
# root_id may be in the parent anyway.
304
tree = repo.revision_tree(parent_id)
305
except errors.NoSuchRevision:
306
# ghost, can't refer to it.
310
parent_ids.append(tree.inventory[root_id].revision)
311
except errors.NoSuchId:
314
# Drop non-head parents
316
graph = repo.get_graph()
317
heads = graph.heads(parent_ids)
319
for parent_id in parent_ids:
320
if parent_id in heads and parent_id not in selected_ids:
321
selected_ids.append(parent_id)
322
parent_keys = [(root_id, parent_id) for parent_id in selected_ids]
added
removed
bzrlib/fetch.py
