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# Copyright (C) 2005, 2006 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
"""Reconcilers are able to fix some potential data errors in a branch."""
__all__ = ['reconcile', 'Reconciler', 'RepoReconciler', 'KnitReconciler']
from bzrlib import ui
from bzrlib.trace import mutter
from bzrlib.tsort import TopoSorter
def reconcile(dir, other=None):
"""Reconcile the data in dir.
Currently this is limited to a inventory 'reweave'.
This is a convenience method, for using a Reconciler object.
Directly using Reconciler is recommended for library users that
desire fine grained control or analysis of the found issues.
:param other: another bzrdir to reconcile against.
"""
reconciler = Reconciler(dir, other=other)
reconciler.reconcile()
class Reconciler(object):
"""Reconcilers are used to reconcile existing data."""
def __init__(self, dir, other=None):
"""Create a Reconciler."""
self.bzrdir = dir
def reconcile(self):
"""Perform reconciliation.
After reconciliation the following attributes document found issues:
inconsistent_parents: The number of revisions in the repository whose
ancestry was being reported incorrectly.
garbage_inventories: The number of inventory objects without revisions
that were garbage collected.
"""
self.pb = ui.ui_factory.nested_progress_bar()
try:
self._reconcile()
finally:
self.pb.finished()
def _reconcile(self):
"""Helper function for performing reconciliation."""
self.repo = self.bzrdir.find_repository()
self.pb.note('Reconciling repository %s',
self.repo.bzrdir.root_transport.base)
repo_reconciler = self.repo.reconcile(thorough=True)
self.inconsistent_parents = repo_reconciler.inconsistent_parents
self.garbage_inventories = repo_reconciler.garbage_inventories
self.pb.note('Reconciliation complete.')
class RepoReconciler(object):
"""Reconciler that reconciles a repository.
Currently this consists of an inventory reweave with revision cross-checks.
"""
def __init__(self, repo, other=None, thorough=False):
"""Construct a RepoReconciler.
:param thorough: perform a thorough check which may take longer but
will correct non-data loss issues such as incorrect
cached data.
"""
self.garbage_inventories = 0
self.inconsistent_parents = 0
self.repo = repo
self.thorough = thorough
def reconcile(self):
"""Perform reconciliation.
After reconciliation the following attributes document found issues:
inconsistent_parents: The number of revisions in the repository whose
ancestry was being reported incorrectly.
garbage_inventories: The number of inventory objects without revisions
that were garbage collected.
"""
self.repo.lock_write()
try:
self.pb = ui.ui_factory.nested_progress_bar()
try:
self._reconcile_steps()
finally:
self.pb.finished()
finally:
self.repo.unlock()
def _reconcile_steps(self):
"""Perform the steps to reconcile this repository."""
self._reweave_inventory()
def _reweave_inventory(self):
"""Regenerate the inventory weave for the repository from scratch.
This is a smart function: it will only do the reweave if doing it
will correct data issues. The self.thorough flag controls whether
only data-loss causing issues (!self.thorough) or all issues
(self.thorough) are treated as requiring the reweave.
"""
# local because needing to know about WeaveFile is a wart we want to hide
from bzrlib.weave import WeaveFile, Weave
transaction = self.repo.get_transaction()
self.pb.update('Reading inventory data.')
self.inventory = self.repo.get_inventory_weave()
# the total set of revisions to process
self.pending = set([rev_id for rev_id in self.repo._revision_store.all_revision_ids(transaction)])
# mapping from revision_id to parents
self._rev_graph = {}
# errors that we detect
self.inconsistent_parents = 0
# we need the revision id of each revision and its available parents list
self._setup_steps(len(self.pending))
for rev_id in self.pending:
# put a revision into the graph.
self._graph_revision(rev_id)
self._check_garbage_inventories()
# if there are no inconsistent_parents and
# (no garbage inventories or we are not doing a thorough check)
if (not self.inconsistent_parents and
(not self.garbage_inventories or not self.thorough)):
self.pb.note('Inventory ok.')
return
self.pb.update('Backing up inventory...', 0, 0)
self.repo.control_weaves.copy(self.inventory, 'inventory.backup', self.repo.get_transaction())
self.pb.note('Backup Inventory created.')
# asking for '' should never return a non-empty weave
new_inventory_vf = self.repo.control_weaves.get_empty('inventory.new',
self.repo.get_transaction())
# we have topological order of revisions and non ghost parents ready.
self._setup_steps(len(self._rev_graph))
for rev_id in TopoSorter(self._rev_graph.items()).iter_topo_order():
parents = self._rev_graph[rev_id]
# double check this really is in topological order.
unavailable = [p for p in parents if p not in new_inventory_vf]
assert len(unavailable) == 0
# this entry has all the non ghost parents in the inventory
# file already.
self._reweave_step('adding inventories')
if isinstance(new_inventory_vf, WeaveFile):
# It's really a WeaveFile, but we call straight into the
# Weave's add method to disable the auto-write-out behaviour.
# This is done to avoid a revision_count * time-to-write additional overhead on
# reconcile.
new_inventory_vf._check_write_ok()
Weave._add_lines(new_inventory_vf, rev_id, parents, self.inventory.get_lines(rev_id),
None)
else:
new_inventory_vf.add_lines(rev_id, parents, self.inventory.get_lines(rev_id))
if isinstance(new_inventory_vf, WeaveFile):
new_inventory_vf._save()
# if this worked, the set of new_inventory_vf.names should equal
# self.pending
assert set(new_inventory_vf.versions()) == self.pending
self.pb.update('Writing weave')
self.repo.control_weaves.copy(new_inventory_vf, 'inventory', self.repo.get_transaction())
self.repo.control_weaves.delete('inventory.new', self.repo.get_transaction())
self.inventory = None
self.pb.note('Inventory regenerated.')
def _setup_steps(self, new_total):
"""Setup the markers we need to control the progress bar."""
self.total = new_total
self.count = 0
def _graph_revision(self, rev_id):
"""Load a revision into the revision graph."""
# pick a random revision
# analyse revision id rev_id and put it in the stack.
self._reweave_step('loading revisions')
rev = self.repo.get_revision_reconcile(rev_id)
assert rev.revision_id == rev_id
parents = []
for parent in rev.parent_ids:
if self._parent_is_available(parent):
parents.append(parent)
else:
mutter('found ghost %s', parent)
self._rev_graph[rev_id] = parents
if self._parents_are_inconsistent(rev_id, parents):
self.inconsistent_parents += 1
mutter('Inconsistent inventory parents: id {%s} '
'inventory claims %r, '
'available parents are %r, '
'unavailable parents are %r',
rev_id,
set(self.inventory.get_parents(rev_id)),
set(parents),
set(rev.parent_ids).difference(set(parents)))
def _parents_are_inconsistent(self, rev_id, parents):
"""Return True if the parents list of rev_id does not match the weave.
This detects inconsistencies based on the self.thorough value:
if thorough is on, the first parent value is checked as well as ghost
differences.
Otherwise only the ghost differences are evaluated.
"""
weave_parents = self.inventory.get_parents(rev_id)
weave_missing_old_ghosts = set(weave_parents) != set(parents)
first_parent_is_wrong = (
len(weave_parents) and len(parents) and
parents[0] != weave_parents[0])
if self.thorough:
return weave_missing_old_ghosts or first_parent_is_wrong
else:
return weave_missing_old_ghosts
def _check_garbage_inventories(self):
"""Check for garbage inventories which we cannot trust
We cant trust them because their pre-requisite file data may not
be present - all we know is that their revision was not installed.
"""
if not self.thorough:
return
inventories = set(self.inventory.versions())
revisions = set(self._rev_graph.keys())
garbage = inventories.difference(revisions)
self.garbage_inventories = len(garbage)
for revision_id in garbage:
mutter('Garbage inventory {%s} found.', revision_id)
def _parent_is_available(self, parent):
"""True if parent is a fully available revision
A fully available revision has a inventory and a revision object in the
repository.
"""
return (parent in self._rev_graph or
(parent in self.inventory and self.repo.has_revision(parent)))
def _reweave_step(self, message):
"""Mark a single step of regeneration complete."""
self.pb.update(message, self.count, self.total)
self.count += 1
class KnitReconciler(RepoReconciler):
"""Reconciler that reconciles a knit format repository.
This will detect garbage inventories and remove them.
Inconsistent parentage is checked for in the revision weave.
"""
def _reconcile_steps(self):
"""Perform the steps to reconcile this repository."""
if self.thorough:
self._load_indexes()
# knits never suffer this
self._gc_inventory()
def _load_indexes(self):
"""Load indexes for the reconciliation."""
self.transaction = self.repo.get_transaction()
self.pb.update('Reading indexes.', 0, 2)
self.inventory = self.repo.get_inventory_weave()
self.pb.update('Reading indexes.', 1, 2)
self.revisions = self.repo._revision_store.get_revision_file(self.transaction)
self.pb.update('Reading indexes.', 2, 2)
def _gc_inventory(self):
"""Remove inventories that are not referenced from the revision store."""
self.pb.update('Checking unused inventories.', 0, 1)
self._check_garbage_inventories()
self.pb.update('Checking unused inventories.', 1, 3)
if not self.garbage_inventories:
self.pb.note('Inventory ok.')
return
self.pb.update('Backing up inventory...', 0, 0)
self.repo.control_weaves.copy(self.inventory, 'inventory.backup', self.transaction)
self.pb.note('Backup Inventory created.')
# asking for '' should never return a non-empty weave
new_inventory_vf = self.repo.control_weaves.get_empty('inventory.new',
self.transaction)
# we have topological order of revisions and non ghost parents ready.
self._setup_steps(len(self.revisions))
for rev_id in TopoSorter(self.revisions.get_graph().items()).iter_topo_order():
parents = self.revisions.get_parents(rev_id)
# double check this really is in topological order.
unavailable = [p for p in parents if p not in new_inventory_vf]
assert len(unavailable) == 0
# this entry has all the non ghost parents in the inventory
# file already.
self._reweave_step('adding inventories')
# ugly but needed, weaves are just way tooooo slow else.
new_inventory_vf.add_lines(rev_id, parents, self.inventory.get_lines(rev_id))
# if this worked, the set of new_inventory_vf.names should equal
# self.pending
assert set(new_inventory_vf.versions()) == set(self.revisions.versions())
self.pb.update('Writing weave')
self.repo.control_weaves.copy(new_inventory_vf, 'inventory', self.transaction)
self.repo.control_weaves.delete('inventory.new', self.transaction)
self.inventory = None
self.pb.note('Inventory regenerated.')
def _check_garbage_inventories(self):
"""Check for garbage inventories which we cannot trust
We cant trust them because their pre-requisite file data may not
be present - all we know is that their revision was not installed.
"""
inventories = set(self.inventory.versions())
revisions = set(self.revisions.versions())
garbage = inventories.difference(revisions)
self.garbage_inventories = len(garbage)
for revision_id in garbage:
mutter('Garbage inventory {%s} found.', revision_id)
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