1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
|
#! /usr/bin/python
#
# Copyright (C) 2005 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Experiment in converting existing bzr branches to weaves."""
# To make this properly useful
#
# 1. assign text version ids, and put those text versions into
# the inventory as they're converted.
#
# 2. keep track of the previous version of each file, rather than
# just using the last one imported
#
# 3. assign entry versions when files are added, renamed or moved.
#
# 4. when merged-in versions are observed, walk down through them
# to discover everything, then commit bottom-up
#
# 5. track ancestry as things are merged in, and commit that in each
# revision
#
# Perhaps it's best to first walk the whole graph and make a plan for
# what should be imported in what order? Need a kind of topological
# sort of all revisions. (Or do we, can we just before doing a revision
# see that all its parents have either been converted or abandoned?)
# Cannot import a revision until all its parents have been
# imported. in other words, we can only import revisions whose
# parents have all been imported. the first step must be to
# import a revision with no parents, of which there must be at
# least one. (So perhaps it's useful to store forward pointers
# from a list of parents to their children?)
#
# Another (equivalent?) approach is to build up the ordered
# ancestry list for the last revision, and walk through that. We
# are going to need that.
#
# We don't want to have to recurse all the way back down the list.
#
# Suppose we keep a queue of the revisions able to be processed at
# any point. This starts out with all the revisions having no
# parents.
#
# This seems like a generally useful algorithm...
#
# The current algorithm is dumb (O(n**2)?) but will do the job, and
# takes less than a second on the bzr.dev branch.
# This currently does a kind of lazy conversion of file texts, where a
# new text is written in every version. That's unnecessary but for
# the moment saves us having to worry about when files need new
# versions.
# TODO: Don't create a progress bar here, have it passed by the caller.
# At least do it from the UI factory.
if False:
try:
import psyco
psyco.full()
except ImportError:
pass
import os
import tempfile
import sys
import logging
import shutil
from bzrlib.branch import Branch, find_branch
from bzrlib.branch import BZR_BRANCH_FORMAT_5, BZR_BRANCH_FORMAT_6
import bzrlib.hashcache as hashcache
from bzrlib.revfile import Revfile
from bzrlib.weave import Weave
from bzrlib.weavefile import read_weave, write_weave
from bzrlib.ui import ui_factory
from bzrlib.atomicfile import AtomicFile
from bzrlib.xml4 import serializer_v4
from bzrlib.xml5 import serializer_v5
from bzrlib.trace import mutter, note, warning, enable_default_logging
from bzrlib.osutils import sha_strings, sha_string
class Convert(object):
def __init__(self, base_dir):
self.base = base_dir
self.converted_revs = set()
self.absent_revisions = set()
self.text_count = 0
self.revisions = {}
self.convert()
def convert(self):
if not self._open_branch():
return
note('starting upgrade of %s', os.path.abspath(self.base))
self._backup_control_dir()
self.pb = ui_factory.progress_bar()
if self.old_format == 4:
note('starting upgrade from format 4 to 5')
self._convert_to_weaves()
self._open_branch()
if self.old_format == 5:
note('starting upgrade from format 5 to 6')
self._convert_to_prefixed()
self._open_branch()
cache = hashcache.HashCache(os.path.abspath(self.base))
cache.clear()
cache.write()
note("finished")
def _convert_to_prefixed(self):
from bzrlib.store import hash_prefix
for store_name in ["weaves", "revision-store"]:
note("adding prefixes to %s" % store_name)
store_dir = os.path.join(self.base, ".bzr", store_name)
for filename in os.listdir(store_dir):
if filename.endswith(".weave") or filename.endswith(".gz"):
file_id = os.path.splitext(filename)[0]
else:
file_id = filename
prefix_dir = os.path.join(store_dir, hash_prefix(file_id))
if not os.path.isdir(prefix_dir):
os.mkdir(prefix_dir)
os.rename(os.path.join(store_dir, filename),
os.path.join(prefix_dir, filename))
self._set_new_format(BZR_BRANCH_FORMAT_6)
def _convert_to_weaves(self):
note('note: upgrade may be faster if all store files are ungzipped first')
if not os.path.isdir(self.base + '/.bzr/weaves'):
os.mkdir(self.base + '/.bzr/weaves')
self.inv_weave = Weave('inventory')
# holds in-memory weaves for all files
self.text_weaves = {}
os.remove(self.branch.controlfilename('branch-format'))
self._convert_working_inv()
rev_history = self.branch.revision_history()
# to_read is a stack holding the revisions we still need to process;
# appending to it adds new highest-priority revisions
self.known_revisions = set(rev_history)
self.to_read = [rev_history[-1]]
while self.to_read:
rev_id = self.to_read.pop()
if (rev_id not in self.revisions
and rev_id not in self.absent_revisions):
self._load_one_rev(rev_id)
self.pb.clear()
to_import = self._make_order()
for i, rev_id in enumerate(to_import):
self.pb.update('converting revision', i, len(to_import))
self._convert_one_rev(rev_id)
self.pb.clear()
note('upgraded to weaves:')
note(' %6d revisions and inventories' % len(self.revisions))
note(' %6d revisions not present' % len(self.absent_revisions))
note(' %6d texts' % self.text_count)
self._write_all_weaves()
self._write_all_revs()
self._cleanup_spare_files()
self._set_new_format(BZR_BRANCH_FORMAT_5)
def _open_branch(self):
self.branch = Branch.open_downlevel(self.base)
self.old_format = self.branch._branch_format
if self.old_format == 6:
note('this branch is in the most current format')
return False
if self.old_format not in (4, 5):
raise BzrError("cannot upgrade from branch format %r" %
self.branch._branch_format)
return True
def _set_new_format(self, format):
self.branch.put_controlfile('branch-format', format)
def _cleanup_spare_files(self):
for n in 'merged-patches', 'pending-merged-patches':
p = self.branch.controlfilename(n)
if not os.path.exists(p):
continue
## assert os.path.getsize(p) == 0
os.remove(p)
shutil.rmtree(self.base + '/.bzr/inventory-store')
shutil.rmtree(self.base + '/.bzr/text-store')
def _backup_control_dir(self):
orig = self.base + '/.bzr'
backup = orig + '.backup'
note('making backup of tree history')
shutil.copytree(orig, backup)
note('%s has been backed up to %s', orig, backup)
note('if conversion fails, you can move this directory back to .bzr')
note('if it succeeds, you can remove this directory if you wish')
def _convert_working_inv(self):
branch = self.branch
inv = serializer_v4.read_inventory(branch.controlfile('inventory', 'rb'))
new_inv_xml = serializer_v5.write_inventory_to_string(inv)
branch.put_controlfile('inventory', new_inv_xml)
def _write_all_weaves(self):
write_a_weave(self.inv_weave, self.base + '/.bzr/inventory.weave')
i = 0
try:
for file_id, file_weave in self.text_weaves.items():
self.pb.update('writing weave', i, len(self.text_weaves))
write_a_weave(file_weave, self.base + '/.bzr/weaves/%s.weave' % file_id)
i += 1
finally:
self.pb.clear()
def _write_all_revs(self):
"""Write all revisions out in new form."""
shutil.rmtree(self.base + '/.bzr/revision-store')
os.mkdir(self.base + '/.bzr/revision-store')
try:
for i, rev_id in enumerate(self.converted_revs):
self.pb.update('write revision', i, len(self.converted_revs))
f = file(self.base + '/.bzr/revision-store/%s' % rev_id, 'wb')
try:
serializer_v5.write_revision(self.revisions[rev_id], f)
finally:
f.close()
finally:
self.pb.clear()
def _load_one_rev(self, rev_id):
"""Load a revision object into memory.
Any parents not either loaded or abandoned get queued to be
loaded."""
self.pb.update('loading revision',
len(self.revisions),
len(self.known_revisions))
if rev_id not in self.branch.revision_store:
self.pb.clear()
note('revision {%s} not present in branch; '
'will be converted as a ghost',
rev_id)
self.absent_revisions.add(rev_id)
else:
rev_xml = self.branch.revision_store[rev_id].read()
rev = serializer_v4.read_revision_from_string(rev_xml)
for parent_id in rev.parent_ids:
self.known_revisions.add(parent_id)
self.to_read.append(parent_id)
self.revisions[rev_id] = rev
def _load_old_inventory(self, rev_id):
assert rev_id not in self.converted_revs
old_inv_xml = self.branch.inventory_store[rev_id].read()
inv = serializer_v4.read_inventory_from_string(old_inv_xml)
rev = self.revisions[rev_id]
if rev.inventory_sha1:
assert rev.inventory_sha1 == sha_string(old_inv_xml), \
'inventory sha mismatch for {%s}' % rev_id
return inv
def _load_updated_inventory(self, rev_id):
assert rev_id in self.converted_revs
inv_xml = self.inv_weave.get_text(rev_id)
inv = serializer_v5.read_inventory_from_string(inv_xml)
return inv
def _convert_one_rev(self, rev_id):
"""Convert revision and all referenced objects to new format."""
rev = self.revisions[rev_id]
inv = self._load_old_inventory(rev_id)
present_parents = [p for p in rev.parent_ids
if p not in self.absent_revisions]
self._convert_revision_contents(rev, inv, present_parents)
self._store_new_weave(rev, inv, present_parents)
self.converted_revs.add(rev_id)
def _store_new_weave(self, rev, inv, present_parents):
# the XML is now updated with text versions
if __debug__:
for file_id in inv:
ie = inv[file_id]
if ie.kind == 'root_directory':
continue
assert hasattr(ie, 'revision'), \
'no revision on {%s} in {%s}' % \
(file_id, rev.revision_id)
new_inv_xml = serializer_v5.write_inventory_to_string(inv)
new_inv_sha1 = sha_string(new_inv_xml)
self.inv_weave.add(rev.revision_id,
present_parents,
new_inv_xml.splitlines(True),
new_inv_sha1)
rev.inventory_sha1 = new_inv_sha1
def _convert_revision_contents(self, rev, inv, present_parents):
"""Convert all the files within a revision.
Also upgrade the inventory to refer to the text revision ids."""
rev_id = rev.revision_id
mutter('converting texts of revision {%s}',
rev_id)
parent_invs = map(self._load_updated_inventory, present_parents)
for file_id in inv:
ie = inv[file_id]
self._convert_file_version(rev, ie, parent_invs)
def _convert_file_version(self, rev, ie, parent_invs):
"""Convert one version of one file.
The file needs to be added into the weave if it is a merge
of >=2 parents or if it's changed from its parent.
"""
if ie.kind == 'root_directory':
return
file_id = ie.file_id
rev_id = rev.revision_id
w = self.text_weaves.get(file_id)
if w is None:
w = Weave(file_id)
self.text_weaves[file_id] = w
text_changed = False
previous_entries = ie.find_previous_heads(parent_invs, w)
for old_revision in previous_entries:
# if this fails, its a ghost ?
assert old_revision in self.converted_revs
self.snapshot_ie(previous_entries, ie, w, rev_id)
del ie.text_id
assert getattr(ie, 'revision', None) is not None
def snapshot_ie(self, previous_revisions, ie, w, rev_id):
# TODO: convert this logic, which is ~= snapshot to
# a call to:. This needs the path figured out. rather than a work_tree
# a v4 revision_tree can be given, or something that looks enough like
# one to give the file content to the entry if it needs it.
# and we need something that looks like a weave store for snapshot to
# save against.
#ie.snapshot(rev, PATH, previous_revisions, REVISION_TREE, InMemoryWeaveStore(self.text_weaves))
if len(previous_revisions) == 1:
previous_ie = previous_revisions.values()[0]
if ie._unchanged(previous_ie):
ie.revision = previous_ie.revision
return
parent_indexes = map(w.lookup, previous_revisions)
if ie.has_text():
file_lines = self.branch.text_store[ie.text_id].readlines()
assert sha_strings(file_lines) == ie.text_sha1
assert sum(map(len, file_lines)) == ie.text_size
w.add(rev_id, parent_indexes, file_lines, ie.text_sha1)
self.text_count += 1
else:
w.add(rev_id, parent_indexes, [], None)
ie.revision = rev_id
##mutter('import text {%s} of {%s}',
## ie.text_id, file_id)
def _make_order(self):
"""Return a suitable order for importing revisions.
The order must be such that an revision is imported after all
its (present) parents.
"""
todo = set(self.revisions.keys())
done = self.absent_revisions.copy()
o = []
while todo:
# scan through looking for a revision whose parents
# are all done
for rev_id in sorted(list(todo)):
rev = self.revisions[rev_id]
parent_ids = set(rev.parent_ids)
if parent_ids.issubset(done):
# can take this one now
o.append(rev_id)
todo.remove(rev_id)
done.add(rev_id)
return o
def write_a_weave(weave, filename):
inv_wf = file(filename, 'wb')
try:
write_weave(weave, inv_wf)
finally:
inv_wf.close()
def upgrade(base_dir):
Convert(base_dir)
|