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# Copyright (C) 2006 by 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
"""Tests for join between versioned files."""
import bzrlib.errors as errors
from bzrlib.tests import TestCaseWithTransport
from bzrlib.transport import get_transport
import bzrlib.versionedfile as versionedfile
class TestJoin(TestCaseWithTransport):
#Tests have self.versionedfile_factory and self.versionedfile_factory_to
#available to create source and target versioned files respectively.
def get_source(self, name='source'):
"""Get a versioned file we will be joining from."""
return self.versionedfile_factory(name,
get_transport(self.get_url()))
def get_target(self, name='target'):
""""Get an empty versioned file to join into."""
return self.versionedfile_factory_to(name,
get_transport(self.get_url()))
def test_join(self):
f1 = self.get_source()
f1.add_lines('r0', [], ['a\n', 'b\n'])
f1.add_lines('r1', ['r0'], ['c\n', 'b\n'])
f2 = self.get_target()
f2.join(f1, None)
def verify_file(f):
self.assertTrue(f.has_version('r0'))
self.assertTrue(f.has_version('r1'))
verify_file(f2)
verify_file(self.get_target())
self.assertRaises(errors.RevisionNotPresent,
f2.join, f1, version_ids=['r3'])
#f3 = self.get_file('1')
#f3.add_lines('r0', ['a\n', 'b\n'], [])
#f3.add_lines('r1', ['c\n', 'b\n'], ['r0'])
#f4 = self.get_file('2')
#f4.join(f3, ['r0'])
#self.assertTrue(f4.has_version('r0'))
#self.assertFalse(f4.has_version('r1'))
def test_gets_expected_inter_worker(self):
source = self.get_source()
target = self.get_target()
inter = versionedfile.InterVersionedFile.get(source, target)
self.assertTrue(isinstance(inter, self.interversionedfile_class))
def test_join_add_parents(self):
"""Join inserting new parents into existing versions
The new version must have the right parent list and must identify
lines originating in another parent.
"""
w1 = self.get_target('w1')
w2 = self.get_source('w2')
w1.add_lines('v-1', [], ['line 1\n'])
w2.add_lines('v-2', [], ['line 2\n'])
w1.add_lines('v-3', ['v-1'], ['line 1\n'])
w2.add_lines('v-3', ['v-2'], ['line 1\n'])
w1.join(w2)
self.assertEqual(sorted(w1.versions()),
'v-1 v-2 v-3'.split())
self.assertEqualDiff(w1.get_text('v-3'),
'line 1\n')
self.assertEqual(sorted(w1.get_parents('v-3')),
['v-1', 'v-2'])
ann = list(w1.annotate('v-3'))
self.assertEqual(len(ann), 1)
self.assertEqual(ann[0][0], 'v-1')
self.assertEqual(ann[0][1], 'line 1\n')
def build_weave1(self):
weave1 = self.get_source()
self.lines1 = ['hello\n']
self.lines3 = ['hello\n', 'cruel\n', 'world\n']
weave1.add_lines('v1', [], self.lines1)
weave1.add_lines('v2', ['v1'], ['hello\n', 'world\n'])
weave1.add_lines('v3', ['v2'], self.lines3)
return weave1
def test_join_with_empty(self):
"""Reweave adding empty weave"""
wb = self.get_target()
w1 = self.build_weave1()
w1.join(wb)
self.verify_weave1(w1)
def verify_weave1(self, w1):
self.assertEqual(sorted(w1.versions()), ['v1', 'v2', 'v3'])
self.assertEqual(w1.get_lines('v1'), ['hello\n'])
self.assertEqual([], w1.get_parents('v1'))
self.assertEqual(w1.get_lines('v2'), ['hello\n', 'world\n'])
self.assertEqual(['v1'], w1.get_parents('v2'))
self.assertEqual(w1.get_lines('v3'), ['hello\n', 'cruel\n', 'world\n'])
self.assertEqual(['v2'], w1.get_parents('v3'))
def test_join_with_ghosts_merges_parents(self):
"""Join combined parent lists"""
wa = self.build_weave1()
wb = self.get_target()
wb.add_lines('x1', [], ['line from x1\n'])
wb.add_lines('v1', [], ['hello\n'])
wb.add_lines('v2', ['v1', 'x1'], ['hello\n', 'world\n'])
wa.join(wb)
self.assertEqual(['v1','x1'], wa.get_parents('v2'))
def test_join_with_ghosts(self):
"""Join that inserts parents of an existing revision.
This can happen when merging from another branch who
knows about revisions the destination does not. In
this test the second weave knows of an additional parent of
v2. Any revisions which are in common still have to have the
same text.
"""
w1 = self.build_weave1()
wb = self.get_target()
wb.add_lines('x1', [], ['line from x1\n'])
wb.add_lines('v1', [], ['hello\n'])
wb.add_lines('v2', ['v1', 'x1'], ['hello\n', 'world\n'])
w1.join(wb)
eq = self.assertEquals
eq(sorted(w1.versions()), ['v1', 'v2', 'v3', 'x1',])
eq(w1.get_text('x1'), 'line from x1\n')
eq(w1.get_lines('v2'), ['hello\n', 'world\n'])
eq(w1.get_parents('v2'), ['v1', 'x1'])
def build_source_weave(self, name, *pattern):
w = self.get_source(name)
for version, parents in pattern:
w.add_lines(version, parents, [])
return w
def build_target_weave(self, name, *pattern):
w = self.get_target(name)
for version, parents in pattern:
w.add_lines(version, parents, [])
return w
def test_join_reorder(self):
"""Reweave requiring reordering of versions.
Weaves must be stored such that parents come before children. When
reweaving, we may add new parents to some children, but it is required
that there must be *some* valid order that can be found, otherwise the
ancestries are contradictory. (For the specific case of inserting
ghost revisions there will be no disagreement, only partial knowledge
of the history.)
Note that the weaves are only partially ordered: when there are two
versions where neither is an ancestor of the other the order in which
they occur is unconstrained. When we join those versions into
another weave, they may become more constrained and it may be
necessary to change their order.
One simple case of this is
w1: (c[], a[], b[a])
w2: (b[], c[b], a[])
We need to recognize that the final weave must show the ordering
a[], b[a], c[b]. The version that must be first in the result is
not first in either of the input weaves.
"""
w1 = self.build_target_weave('1', ('c', []), ('a', []), ('b', ['a']))
w2 = self.build_source_weave('2', ('b', []), ('c', ['b']), ('a', []))
w1.join(w2)
self.assertEqual([], w1.get_parents('a'))
self.assertEqual(['a'], w1.get_parents('b'))
self.assertEqual(['b'], w1.get_parents('c'))
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