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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?)
try:
import psyco
psyco.full()
except ImportError:
pass
import tempfile
import hotshot, hotshot.stats
import sys
import logging
import bzrlib.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
import bzrlib.trace
def convert():
bzrlib.trace.enable_default_logging()
pb = ProgressBar()
inv_weave = Weave()
last_text_sha = {}
# holds in-memory weaves for all files
text_weaves = {}
b = bzrlib.branch.find_branch('.')
revno = 1
rev_history = b.revision_history()
last_idx = None
inv_parents = []
text_count = 0
for rev_id in rev_history:
pb.update('converting revision', revno, len(rev_history))
inv_xml = b.get_inventory_xml(rev_id).readlines()
new_idx = inv_weave.add(rev_id, inv_parents, inv_xml)
inv_parents = [new_idx]
tree = b.revision_tree(rev_id)
inv = tree.inventory
# for each file in the inventory, put it into its own revfile
for file_id in inv:
ie = inv[file_id]
if ie.kind != 'file':
continue
if last_text_sha.get(file_id) == ie.text_sha1:
# same as last time
continue
last_text_sha[file_id] = ie.text_sha1
# new text (though possibly already stored); need to store it
text_lines = tree.get_file(file_id).readlines()
# if the file's created for the first time in this
# revision then make a new weave; else find the old one
if file_id not in text_weaves:
text_weaves[file_id] = Weave()
w = text_weaves[file_id]
# base the new text version off whatever was last
# (actually it'd be better to track this, to allow for
# files that are deleted and then reappear)
last = len(w)
if last == 0:
parents = []
else:
parents = [last-1]
w.add(rev_id, parents, text_lines)
text_count += 1
revno += 1
pb.clear()
print '%6d revisions and inventories' % revno
print '%6d texts' % text_count
i = 0
# TODO: commit them all atomically at the end, not one by one
write_atomic_weave(inv_weave, 'weaves/inventory.weave')
for file_id, file_weave in text_weaves.items():
pb.update('writing weave', i, len(text_weaves))
write_atomic_weave(file_weave, 'weaves/%s.weave' % file_id)
i += 1
pb.clear()
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)
if '-p' in sys.argv[1:]:
profile_convert()
else:
convert()
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