21
32
that has merged into it. As the first step of a merge, pull, or
22
33
branch operation we copy history from the source into the destination
36
The copying is done in a slightly complicated order. We don't want to
37
add a revision to the store until everything it refers to is also
38
stored, so that if a revision is present we can totally recreate it.
39
However, we can't know what files are included in a revision until we
40
read its inventory. Therefore, we first pull the XML and hold it in
41
memory until we've updated all of the files referenced.
28
from bzrlib.lazy_import import lazy_import
29
lazy_import(globals(), """
40
from bzrlib.revision import NULL_REVISION
41
from bzrlib.trace import mutter
44
class RepoFetcher(object):
45
"""Pull revisions and texts from one repository to another.
47
This should not be used directly, it's essential a object to encapsulate
48
the logic in InterRepository.fetch().
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
63
def greedy_fetch(to_branch, from_branch, revision=None, pb=None):
64
f = Fetcher(to_branch, from_branch, revision, pb)
65
return f.count_copied, f.failed_revisions
69
class Fetcher(object):
70
"""Pull revisions and texts from one branch to another.
72
This doesn't update the destination's history; that can be done
73
separately if desired.
76
If set, pull only up to this revision_id.
80
last_revision -- if last_revision
81
is given it will be that, otherwise the last revision of
84
count_copied -- number of revisions copied
86
count_weaves -- number of file weaves copied
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.
61
self.to_repository = to_repository
62
self.from_repository = from_repository
63
self.sink = to_repository._get_sink()
64
# must not mutate self._last_revision as its potentially a shared instance
65
self._last_revision = last_revision
66
self._fetch_spec = fetch_spec
67
self.find_ghosts = find_ghosts
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)
75
self.from_repository.unlock()
78
"""Primary worker function.
80
This initialises all the needed variables, and then fetches the
81
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))
88
def __init__(self, to_branch, from_branch, last_revision=None, pb=None):
89
if to_branch == from_branch:
90
raise Exception("can't fetch from a branch to itself")
91
self.to_branch = to_branch
92
self.to_weaves = to_branch.weave_store
93
self.to_control = to_branch.control_weaves
94
self.from_branch = from_branch
95
self.from_weaves = from_branch.weave_store
96
self.from_control = from_branch.control_weaves
97
self.failed_revisions = []
89
99
self.count_total = 0
90
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")
150
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
158
mutter('fetch up to rev {%s}', self._last_revision)
159
if self._last_revision is NULL_REVISION:
160
# 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.
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]
100
self.count_weaves = 0
101
self.copied_file_ids = set()
103
self.pb = bzrlib.ui.ui_factory.progress_bar()
107
self.last_revision = self._find_last_revision(last_revision)
108
except NoSuchRevision, e:
109
mutter('failed getting last revision: %s', e)
110
raise InstallFailed([last_revision])
111
mutter('fetch up to rev {%s}', self.last_revision)
113
revs_to_fetch = self._compare_ancestries()
115
raise InstallFailed([self.last_revision])
116
self._copy_revisions(revs_to_fetch)
117
self.new_ancestry = revs_to_fetch
120
def _find_last_revision(self, last_revision):
121
"""Find the limiting source revision.
123
Every ancestor of that revision will be merged across.
125
Returns the revision_id, or returns None if there's no history
126
in the source branch."""
127
self.pb.update('get source history')
128
from_history = self.from_branch.revision_history()
129
self.pb.update('get destination history')
131
self.from_branch.get_revision(last_revision)
134
return from_history[-1]
136
return None # no history in the source branch
139
def _compare_ancestries(self):
140
"""Get a list of revisions that must be copied.
142
That is, every revision that's in the ancestry of the source
143
branch and not in the destination branch."""
144
self.pb.update('get source ancestry')
145
self.from_ancestry = self.from_branch.get_ancestry(self.last_revision)
147
dest_last_rev = self.to_branch.last_revision()
148
self.pb.update('get destination ancestry')
150
dest_ancestry = self.to_branch.get_ancestry(dest_last_rev)
153
ss = set(dest_ancestry)
155
for rev_id in self.from_ancestry:
157
to_fetch.append(rev_id)
158
mutter('need to get revision {%s}', rev_id)
159
mutter('need to get %d revisions in total', len(to_fetch))
160
self.count_total = len(to_fetch)
163
def _copy_revisions(self, revs_to_fetch):
165
for rev_id in revs_to_fetch:
169
if self.to_branch.has_revision(rev_id):
171
self.pb.update('fetch revision', i, self.count_total)
172
self._copy_one_revision(rev_id)
173
self.count_copied += 1
176
def _copy_one_revision(self, rev_id):
177
"""Copy revision and everything referenced by it."""
178
mutter('copying revision {%s}', rev_id)
179
rev_xml = self.from_branch.get_revision_xml(rev_id)
180
inv_xml = self.from_branch.get_inventory_xml(rev_id)
181
rev = serializer_v5.read_revision_from_string(rev_xml)
182
inv = serializer_v5.read_inventory_from_string(inv_xml)
183
assert rev.revision_id == rev_id
184
assert rev.inventory_sha1 == sha_string(inv_xml)
185
mutter(' commiter %s, %d parents',
188
self._copy_new_texts(rev_id, inv)
189
parents = rev.parent_ids
190
for parent in parents:
191
if not self.to_branch.has_revision(parent):
192
parents.pop(parents.index(parent))
193
self._copy_inventory(rev_id, inv_xml, parents)
194
self.to_branch.revision_store.add(StringIO(rev_xml), rev_id)
195
mutter('copied revision %s', rev_id)
198
def _copy_inventory(self, rev_id, inv_xml, parent_ids):
199
self.to_control.add_text('inventory', rev_id,
200
split_lines(inv_xml), parent_ids)
202
def _copy_new_texts(self, rev_id, inv):
203
"""Copy any new texts occuring in this revision."""
204
# TODO: Rather than writing out weaves every time, hold them
205
# in memory until everything's done? But this way is nicer
206
# if it's interrupted.
207
for path, ie in inv.iter_entries():
208
if ie.revision != rev_id:
210
mutter('%s {%s} is changed in this revision',
212
self._copy_one_weave(rev_id, ie.file_id)
215
def _copy_one_weave(self, rev_id, file_id):
216
"""Copy one file weave."""
217
mutter('copy file {%s} modified in {%s}', file_id, rev_id)
218
if file_id in self.copied_file_ids:
219
mutter('file {%s} already copied', file_id)
221
from_weave = self.from_weaves.get_weave(file_id)
222
to_weave = self.to_weaves.get_weave_or_empty(file_id)
224
to_weave.join(from_weave)
225
except errors.WeaveParentMismatch:
226
to_weave.reweave(from_weave)
227
self.to_weaves.put_weave(file_id, to_weave)
228
self.count_weaves += 1
229
self.copied_file_ids.add(file_id)
230
mutter('copied file {%s}', file_id)
added
removed
bzrlib/fetch.py
