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#! /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.
if True:
try:
import psyco
psyco.full()
except ImportError:
pass
import tempfile
import hotshot, hotshot.stats
import sys
import logging
import time
from bzrlib.branch import Branch, find_branch
from bzrlib.revfile import Revfile
from bzrlib.weave import Weave
from bzrlib.weavefile import read_weave, write_weave
from bzrlib.progress import ProgressBar
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):
self.converted_revs = set()
self.absent_revisions = set()
self.text_count = 0
self.revisions = {}
self.inventories = {}
self.convert()
def convert(self):
enable_default_logging()
self.pb = ProgressBar()
self.inv_weave = Weave('__inventory')
self.anc_weave = Weave('__ancestry')
last_text_sha = {}
# holds in-memory weaves for all files
self.text_weaves = {}
b = self.branch = Branch('.', relax_version_check=True)
revno = 1
rev_history = b.revision_history()
last_idx = None
inv_parents = []
# to_read is a stack holding the revisions we still need to process;
# appending to it adds new highest-priority revisions
importorder = []
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)
print '(not really) upgraded to weaves:'
print ' %6d revisions and inventories' % len(self.revisions)
print ' %6d absent revisions removed' % len(self.absent_revisions)
print ' %6d texts' % self.text_count
self._write_all_weaves()
def _write_all_weaves(self):
i = 0
write_atomic_weave(self.inv_weave, 'weaves/inventory.weave')
try:
for file_id, file_weave in self.text_weaves.items():
self.pb.update('writing weave', i, len(self.text_weaves))
write_atomic_weave(file_weave, 'weaves/%s.weave' % file_id)
i += 1
finally:
self.pb.clear()
## write_atomic_weave(self.anc_weave, 'weaves/ancestry.weave')
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 not be converted',
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
old_inv_xml = self.branch.inventory_store[rev_id].read()
inv = serializer_v4.read_inventory_from_string(old_inv_xml)
assert rev.inventory_sha1 == sha_string(old_inv_xml)
self.inventories[rev_id] = inv
def _convert_one_rev(self, rev_id):
"""Convert revision and all referenced objects to new format."""
rev = self.revisions[rev_id]
inv = self.inventories[rev_id]
self._convert_revision_contents(rev, inv)
# the XML is now updated with text versions
new_inv_xml = serializer_v5.write_inventory_to_string(inv)
inv_parents = [x for x in self.revisions[rev_id].parent_ids
if x not in self.absent_revisions]
new_inv_sha1 = sha_string(new_inv_xml)
self.inv_weave.add(rev_id, inv_parents,
new_inv_xml.splitlines(True),
new_inv_sha1)
# TODO: Upgrade revision XML and write that out
rev.inventory_sha1 = new_inv_sha1
self.converted_revs.add(rev_id)
def _convert_revision_contents(self, rev, inv):
"""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)
for path, ie in inv.iter_entries():
if ie.kind != 'file':
continue
self._convert_file_version(rev, ie)
# TODO: Check and convert name versions
def _convert_file_version(self, rev, ie):
"""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.
"""
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
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
file_parents = []
text_changed = False
for parent_id in rev.parent_ids:
if parent_id in self.absent_revisions:
continue
assert parent_id in self.converted_revs
parent_inv = self.inventories[parent_id]
if parent_inv.has_id(file_id):
parent_ie = parent_inv[file_id]
old_text_version = parent_ie.text_version
assert old_text_version in self.converted_revs
if old_text_version not in file_parents:
file_parents.append(old_text_version)
if parent_ie.text_sha1 != ie.text_sha1:
text_changed = True
if len(file_parents) != 1 or text_changed:
w.add(rev_id, file_parents, file_lines, ie.text_sha1)
ie.name_version = ie.text_version = rev_id
mutter('import text {%s} of {%s}',
ie.text_id, file_id)
else:
mutter('text of {%s} unchanged from parent', file_id)
ie.text_version = file_parents[0]
ie.name_version = file_parents[0]
del ie.text_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_atomic_weave(weave, filename):
inv_wf = AtomicFile(filename)
try:
write_weave(weave, inv_wf)
inv_wf.commit()
finally:
inv_wf.close()
def profile_convert():
prof_f = tempfile.NamedTemporaryFile()
prof = hotshot.Profile(prof_f.name)
prof.runcall(Convert)
prof.close()
stats = hotshot.stats.load(prof_f.name)
##stats.strip_dirs()
stats.sort_stats('time')
# XXX: Might like to write to stderr or the trace file instead but
# print_stats seems hardcoded to stdout
stats.print_stats(20)
enable_default_logging()
if '-p' in sys.argv[1:]:
profile_convert()
else:
Convert()
|