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# Copyright (C) 2007 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
from bzrlib import (
errors,
graph,
)
from bzrlib.revision import NULL_REVISION
from bzrlib.tests import TestCaseWithMemoryTransport
# Ancestry 1:
#
# NULL_REVISION
# |
# rev1
# /\
# rev2a rev2b
# | |
# rev3 /
# | /
# rev4
ancestry_1 = {'rev1': [NULL_REVISION], 'rev2a': ['rev1'], 'rev2b': ['rev1'],
'rev3': ['rev2a'], 'rev4': ['rev3', 'rev2b']}
# Ancestry 2:
#
# NULL_REVISION
# / \
# rev1a rev1b
# |
# rev2a
# |
# rev3a
# |
# rev4a
ancestry_2 = {'rev1a': [NULL_REVISION], 'rev2a': ['rev1a'],
'rev1b': [NULL_REVISION], 'rev3a': ['rev2a'], 'rev4a': ['rev3a']}
# Criss cross ancestry
#
# NULL_REVISION
# |
# rev1
# / \
# rev2a rev2b
# |\ /|
# | X |
# |/ \|
# rev3a rev3b
criss_cross = {'rev1': [NULL_REVISION], 'rev2a': ['rev1'], 'rev2b': ['rev1'],
'rev3a': ['rev2a', 'rev2b'], 'rev3b': ['rev2b', 'rev2a']}
# Criss-cross 2
#
# NULL_REVISION
# / \
# rev1a rev1b
# |\ /|
# | \ / |
# | X |
# | / \ |
# |/ \|
# rev2a rev2b
criss_cross2 = {'rev1a': [NULL_REVISION], 'rev1b': [NULL_REVISION],
'rev2a': ['rev1a', 'rev1b'], 'rev2b': ['rev1b', 'rev1a']}
# Mainline:
#
# NULL_REVISION
# |
# rev1
# / \
# | rev2b
# | /
# rev2a
mainline = {'rev1': [NULL_REVISION], 'rev2a': ['rev1', 'rev2b'],
'rev2b': ['rev1']}
# feature branch:
#
# NULL_REVISION
# |
# rev1
# |
# rev2b
# |
# rev3b
feature_branch = {'rev1': [NULL_REVISION],
'rev2b': ['rev1'], 'rev3b': ['rev2b']}
# History shortcut
# NULL_REVISION
# |
# rev1------
# / \ \
# rev2a rev2b rev2c
# | / \ /
# rev3a reveb
history_shortcut = {'rev1': [NULL_REVISION], 'rev2a': ['rev1'],
'rev2b': ['rev1'], 'rev2c': ['rev1'],
'rev3a': ['rev2a', 'rev2b'], 'rev3b': ['rev2b', 'rev2c']}
class TestGraph(TestCaseWithMemoryTransport):
def make_graph(self, ancestors):
tree = self.prepare_memory_tree('.')
self.build_ancestry(tree, ancestors)
tree.unlock()
return tree.branch.repository.get_graph()
def prepare_memory_tree(self, location):
tree = self.make_branch_and_memory_tree(location)
tree.lock_write()
tree.add('.')
return tree
def build_ancestry(self, tree, ancestors):
"""Create an ancestry as specified by a graph dict
:param tree: A tree to use
:param ancestors: a dict of {node: [node_parent, ...]}
"""
pending = [NULL_REVISION]
descendants = {}
for descendant, parents in ancestors.iteritems():
for parent in parents:
descendants.setdefault(parent, []).append(descendant)
while len(pending) > 0:
cur_node = pending.pop()
for descendant in descendants.get(cur_node, []):
if tree.branch.repository.has_revision(descendant):
continue
parents = [p for p in ancestors[descendant] if p is not
NULL_REVISION]
if len([p for p in parents if not
tree.branch.repository.has_revision(p)]) > 0:
continue
tree.set_parent_ids(parents)
if len(parents) > 0:
left_parent = parents[0]
else:
left_parent = NULL_REVISION
tree.branch.set_last_revision_info(
len(tree.branch._lefthand_history(left_parent)),
left_parent)
tree.commit(descendant, rev_id=descendant)
pending.append(descendant)
def test_lca(self):
"""Test finding least common ancestor.
ancestry_1 should always have a single common ancestor
"""
graph = self.make_graph(ancestry_1)
self.assertRaises(errors.InvalidRevisionId, graph.find_lca, None)
self.assertEqual(set([NULL_REVISION]),
graph.find_lca(NULL_REVISION, NULL_REVISION))
self.assertEqual(set([NULL_REVISION]),
graph.find_lca(NULL_REVISION, 'rev1'))
self.assertEqual(set(['rev1']), graph.find_lca('rev1', 'rev1'))
self.assertEqual(set(['rev1']), graph.find_lca('rev2a', 'rev2b'))
def test_lca_criss_cross(self):
"""Test least-common-ancestor after a criss-cross merge."""
graph = self.make_graph(criss_cross)
self.assertEqual(set(['rev2a', 'rev2b']),
graph.find_lca('rev3a', 'rev3b'))
self.assertEqual(set(['rev2b']),
graph.find_lca('rev3a', 'rev3b', 'rev2b'))
def test_lca_shortcut(self):
"""Test least-common ancestor on this history shortcut"""
graph = self.make_graph(history_shortcut)
self.assertEqual(set(['rev2b']), graph.find_lca('rev3a', 'rev3b'))
def test_recursive_unique_lca(self):
"""Test finding a unique least common ancestor.
ancestry_1 should always have a single common ancestor
"""
graph = self.make_graph(ancestry_1)
self.assertEqual(NULL_REVISION,
graph.find_unique_lca(NULL_REVISION, NULL_REVISION))
self.assertEqual(NULL_REVISION,
graph.find_unique_lca(NULL_REVISION, 'rev1'))
self.assertEqual('rev1', graph.find_unique_lca('rev1', 'rev1'))
self.assertEqual('rev1', graph.find_unique_lca('rev2a', 'rev2b'))
def test_unique_lca_criss_cross(self):
"""Ensure we don't pick non-unique lcas in a criss-cross"""
graph = self.make_graph(criss_cross)
self.assertEqual('rev1', graph.find_unique_lca('rev3a', 'rev3b'))
def test_unique_lca_null_revision(self):
"""Ensure we pick NULL_REVISION when necessary"""
graph = self.make_graph(criss_cross2)
self.assertEqual('rev1b', graph.find_unique_lca('rev2a', 'rev1b'))
self.assertEqual(NULL_REVISION,
graph.find_unique_lca('rev2a', 'rev2b'))
def test_unique_lca_null_revision2(self):
"""Ensure we pick NULL_REVISION when necessary"""
graph = self.make_graph(ancestry_2)
self.assertEqual(NULL_REVISION,
graph.find_unique_lca('rev4a', 'rev1b'))
def test_common_ancestor_two_repos(self):
"""Ensure we do unique_lca using data from two repos"""
mainline_tree = self.prepare_memory_tree('mainline')
self.build_ancestry(mainline_tree, mainline)
mainline_tree.unlock()
# This is cheating, because the revisions in the graph are actually
# different revisions, despite having the same revision-id.
feature_tree = self.prepare_memory_tree('feature')
self.build_ancestry(feature_tree, feature_branch)
feature_tree.unlock()
graph = mainline_tree.branch.repository.get_graph(
feature_tree.branch.repository)
self.assertEqual('rev2b', graph.find_unique_lca('rev2a', 'rev3b'))
def test_graph_difference(self):
graph = self.make_graph(ancestry_1)
self.assertEqual((set(), set()), graph.find_difference('rev1', 'rev1'))
self.assertEqual((set(), set(['rev1'])),
graph.find_difference(NULL_REVISION, 'rev1'))
self.assertEqual((set(['rev1']), set()),
graph.find_difference('rev1', NULL_REVISION))
self.assertEqual((set(['rev2a', 'rev3']), set(['rev2b'])),
graph.find_difference('rev3', 'rev2b'))
self.assertEqual((set(['rev4', 'rev3', 'rev2a']), set()),
graph.find_difference('rev4', 'rev2b'))
def test_graph_difference_criss_cross(self):
graph = self.make_graph(criss_cross)
self.assertEqual((set(['rev3a']), set(['rev3b'])),
graph.find_difference('rev3a', 'rev3b'))
self.assertEqual((set([]), set(['rev3b', 'rev2b'])),
graph.find_difference('rev2a', 'rev3b'))
def test_stacked_parents_provider(self):
class ParentsProvider(object):
def __init__(self, ancestry):
self.ancestry = ancestry
def get_parents(self, revisions):
return [self.ancestry.get(r, None) for r in revisions]
parents1 = ParentsProvider({'rev2': ['rev3']})
parents2 = ParentsProvider({'rev1': ['rev4']})
stacked = graph._StackedParentsProvider([parents1, parents2])
self.assertEqual([['rev4',], ['rev3']],
stacked.get_parents(['rev1', 'rev2']))
self.assertEqual([['rev3',], ['rev4']],
stacked.get_parents(['rev2', 'rev1']))
self.assertEqual([['rev3',], ['rev3']],
stacked.get_parents(['rev2', 'rev2']))
self.assertEqual([['rev4',], ['rev4']],
stacked.get_parents(['rev1', 'rev1']))
def test_iter_topo_order(self):
graph = self.make_graph(ancestry_1)
args = ['rev2a', 'rev3', 'rev1']
topo_args = list(graph.iter_topo_order(args))
self.assertEqual(set(args), set(topo_args))
self.assertTrue(topo_args.index('rev2a') > topo_args.index('rev1'))
self.assertTrue(topo_args.index('rev2a') < topo_args.index('rev3'))
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