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# Copyright (C) 2005 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
"""Test reweave code.
Reweave takes two weaves containing a partial view of history and combines
them into a single weave containing all the information. This can include
- versions recorded in only one file
- versions with different (but not contradictory) lists of parent
revisions
It is an error if either of these conditions occur:
- contradictory ancestry graphs, e.g.
- v1 is an ancestor of v2 in one weave, and vice versa in the other
- different text for any version
"""
import os
import sys
from bzrlib.selftest import TestCase
from bzrlib.weave import Weave, reweave
from bzrlib.errors import WeaveParentMismatch
class TestReweave(TestCase):
def test_reweave_add_parents(self):
"""Reweave inserting new parents
The new version must have the right parent list and must identify
lines originating in another parent.
"""
w1 = Weave('w1')
w2 = Weave('w2')
w1.add('v-1', [], ['line 1\n'])
w2.add('v-2', [], ['line 2\n'])
w1.add('v-3', ['v-1'], ['line 1\n'])
w2.add('v-3', ['v-2'], ['line 1\n'])
w3 = reweave(w1, w2)
self.assertEqual(sorted(w3.names()),
'v-1 v-2 v-3'.split())
self.assertEqualDiff(w3.get_text('v-3'),
'line 1\n')
self.assertEqual(sorted(w3.parent_names('v-3')),
['v-1', 'v-2'])
ann = list(w3.annotate('v-3'))
self.assertEqual(len(ann), 1)
self.assertEqual(w3.idx_to_name(ann[0][0]), 'v-1')
self.assertEqual(ann[0][1], 'line 1\n')
def build_weave1(self):
weave1 = Weave()
self.lines1 = ['hello\n']
self.lines3 = ['hello\n', 'cruel\n', 'world\n']
weave1.add('v1', [], self.lines1)
weave1.add('v2', [0], ['hello\n', 'world\n'])
weave1.add('v3', [1], self.lines3)
return weave1
def test_reweave_with_empty(self):
"""Reweave adding empty weave"""
wb = Weave()
w1 = self.build_weave1()
wr = reweave(w1, wb)
eq = self.assertEquals
eq(sorted(wr.iter_names()), ['v1', 'v2', 'v3'])
eq(wr.get_lines('v3'), ['hello\n', 'cruel\n', 'world\n'])
self.assertEquals(wr, w1)
def test_join_with_ghosts_raises_parent_mismatch(self):
"""Join weave traps parent mismatch"""
wa = self.build_weave1()
wb = Weave()
wb.add('x1', [], ['line from x1\n'])
wb.add('v1', [], ['hello\n'])
wb.add('v2', ['v1', 'x1'], ['hello\n', 'world\n'])
self.assertRaises(WeaveParentMismatch, wa.join, wb)
def test_reweave_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()
wa = w1.copy()
wb = Weave()
wb.add('x1', [], ['line from x1\n'])
wb.add('v1', [], ['hello\n'])
wb.add('v2', ['v1', 'x1'], ['hello\n', 'world\n'])
wc = reweave(wa, wb)
eq = self.assertEquals
eq(sorted(wc.iter_names()), ['v1', 'v2', 'v3', 'x1',])
eq(wc.get_text('x1'), 'line from x1\n')
eq(wc.get_lines('v2'), ['hello\n', 'world\n'])
eq(wc.parent_names('v2'), ['v1', 'x1'])
w1.reweave(wb)
self.assertEquals(wc, w1)
def build_empty_weave(self, *pattern):
w = Weave()
for version, parents in pattern:
w.add(version, parents, [])
return w
def test_reweave_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 reweave 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_empty_weave(('c', []), ('a', []), ('b', ['a']))
w2 = self.build_empty_weave(('b', []), ('c', ['b']), ('a', []))
w3 = reweave(w1, w2)
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