~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2006-2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

#

# Author: Aaron Bentley <aaron.bentley@utoronto.ca>

"""Black-box tests for bzr merge.

"""

import doctest

import os

from testtools import matchers

from bzrlib import (

    branch,

    bzrdir,

    conflicts,

    merge_directive,

    osutils,

    tests,

    urlutils,

    workingtree,

    )

from bzrlib.tests import (

    scenarios,

    script,

    )

load_tests = scenarios.load_tests_apply_scenarios

class TestMerge(tests.TestCaseWithTransport):

    def example_branch(self, path='.'):

        tree = self.make_branch_and_tree(path)

        self.build_tree_contents([

            (osutils.pathjoin(path, 'hello'), 'foo'),

            (osutils.pathjoin(path, 'goodbye'), 'baz')])

        tree.add('hello')

        tree.commit(message='setup')

        tree.add('goodbye')

        tree.commit(message='setup')

        return tree

    def create_conflicting_branches(self):

        """Create two branches which have overlapping modifications.

        :return: (tree, other_branch) Where merging other_branch causes a file

            conflict.

        """

        builder = self.make_branch_builder('branch')

        builder.build_snapshot('rev1', None,

            [('add', ('', 'root-id', 'directory', None)),

             ('add', ('fname', 'f-id', 'file', 'a\nb\nc\n'))])

        builder.build_snapshot('rev2other', ['rev1'],

            [('modify', ('f-id', 'a\nB\nD\n'))])

        other = builder.get_branch().bzrdir.sprout('other').open_branch()

        builder.build_snapshot('rev2this', ['rev1'],

            [('modify', ('f-id', 'a\nB\nC\n'))])

        tree = builder.get_branch().create_checkout('tree', lightweight=True)

        return tree, other

    def test_merge_reprocess(self):

        d = bzrdir.BzrDir.create_standalone_workingtree('.')

        d.commit('h')

        self.run_bzr('merge . --reprocess --merge-type weave')

    def test_merge(self):

        a_tree = self.example_branch('a')

        ancestor = a_tree.branch.revno()

        b_tree = a_tree.bzrdir.sprout('b').open_workingtree()

        self.build_tree_contents([('b/goodbye', 'quux')])

        b_tree.commit(message="more u's are always good")

        self.build_tree_contents([('a/hello', 'quuux')])

        # We can't merge when there are in-tree changes

        self.run_bzr('merge ../b', retcode=3, working_dir='a')

        a = workingtree.WorkingTree.open('a')

        a_tip = a.commit("Like an epidemic of u's")

        def run_merge_then_revert(args, retcode=None, working_dir='a'):

            self.run_bzr(['merge', '../b', '-r', 'last:1..last:1'] + args,

                         retcode=retcode, working_dir=working_dir)

            if retcode != 3:

                a_tree.revert(backups=False)

        run_merge_then_revert(['--merge-type', 'bloof'], retcode=3)

        run_merge_then_revert(['--merge-type', 'merge3'])

        run_merge_then_revert(['--merge-type', 'weave'])

        run_merge_then_revert(['--merge-type', 'lca'])

        self.run_bzr_error(['Show-base is not supported for this merge type'],

                           'merge ../b -r last:1..last:1 --merge-type weave'

                           ' --show-base', working_dir='a')

        a_tree.revert(backups=False)

        self.run_bzr('merge ../b -r last:1..last:1 --reprocess',

                     working_dir='a')

        a_tree.revert(backups=False)

        self.run_bzr('merge ../b -r last:1', working_dir='a')

        self.check_file_contents('a/goodbye', 'quux')

        # Merging a branch pulls its revision into the tree

        b = branch.Branch.open('b')

        b_tip = b.last_revision()

        self.assertTrue(a.branch.repository.has_revision(b_tip))

        self.assertEqual([a_tip, b_tip], a.get_parent_ids())

        a_tree.revert(backups=False)

        out, err = self.run_bzr('merge -r revno:1:./hello', retcode=3,

                                working_dir='a')

        self.assertTrue("Not a branch" in err)

        self.run_bzr('merge -r revno:%d:./..revno:%d:../b'

                    %(ancestor,b.revno()), working_dir='a')

        self.assertEquals(a.get_parent_ids(),

                          [a.branch.last_revision(), b.last_revision()])

        self.check_file_contents('a/goodbye', 'quux')

        a_tree.revert(backups=False)

        self.run_bzr('merge -r revno:%d:../b'%b.revno(), working_dir='a')

        self.assertEquals(a.get_parent_ids(),

                          [a.branch.last_revision(), b.last_revision()])

        a_tip = a.commit('merged')

        self.run_bzr('merge ../b -r last:1', working_dir='a')

        self.assertEqual([a_tip], a.get_parent_ids())

    def test_merge_defaults_to_reprocess(self):

        tree, other = self.create_conflicting_branches()

        # The default merge algorithm should enable 'reprocess' because

        # 'show-base' is not set

        self.run_bzr('merge ../other', working_dir='tree',

                     retcode=1)

        self.assertEqualDiff('a\n'

                             'B\n'

                             '<<<<<<< TREE\n'

                             'C\n'

                             '=======\n'

                             'D\n'

                             '>>>>>>> MERGE-SOURCE\n',

                             tree.get_file_text('f-id'))

    def test_merge_explicit_reprocess_show_base(self):

        tree, other = self.create_conflicting_branches()

        # Explicitly setting --reprocess, and --show-base is an error

        self.run_bzr_error(['Cannot do conflict reduction and show base'],

                           'merge ../other --reprocess --show-base',

                           working_dir='tree')

    def test_merge_override_reprocess(self):

        tree, other = self.create_conflicting_branches()

        # Explicitly disable reprocess

        self.run_bzr('merge ../other --no-reprocess', working_dir='tree',

                     retcode=1)

        self.assertEqualDiff('a\n'

                             '<<<<<<< TREE\n'

                             'B\n'

                             'C\n'

                             '=======\n'

                             'B\n'

                             'D\n'

                             '>>>>>>> MERGE-SOURCE\n',

                             tree.get_file_text('f-id'))

    def test_merge_override_show_base(self):

        tree, other = self.create_conflicting_branches()

        # Setting '--show-base' will auto-disable '--reprocess'

        self.run_bzr('merge ../other --show-base', working_dir='tree',

                     retcode=1)

        self.assertEqualDiff('a\n'

                             '<<<<<<< TREE\n'

                             'B\n'

                             'C\n'

                             '||||||| BASE-REVISION\n'

                             'b\n'

                             'c\n'

                             '=======\n'

                             'B\n'

                             'D\n'

                             '>>>>>>> MERGE-SOURCE\n',

                             tree.get_file_text('f-id'))

    def test_merge_with_missing_file(self):

        """Merge handles missing file conflicts"""

        self.build_tree_contents([

            ('a/',),

            ('a/sub/',),

            ('a/sub/a.txt', 'hello\n'),

            ('a/b.txt', 'hello\n'),

            ('a/sub/c.txt', 'hello\n')])

        a_tree = self.make_branch_and_tree('a')

        a_tree.add(['sub', 'b.txt', 'sub/c.txt', 'sub/a.txt'])

        a_tree.commit(message='added a')

        b_tree = a_tree.bzrdir.sprout('b').open_workingtree()

        self.build_tree_contents([

            ('a/sub/a.txt', 'hello\nthere\n'),

            ('a/b.txt', 'hello\nthere\n'),

            ('a/sub/c.txt', 'hello\nthere\n')])

        a_tree.commit(message='Added there')

        os.remove('a/sub/a.txt')

        os.remove('a/sub/c.txt')

        os.rmdir('a/sub')

        os.remove('a/b.txt')

        a_tree.commit(message='Removed a.txt')

        self.build_tree_contents([

            ('b/sub/a.txt', 'hello\nsomething\n'),

            ('b/b.txt', 'hello\nsomething\n'),

            ('b/sub/c.txt', 'hello\nsomething\n')])

        b_tree.commit(message='Modified a.txt')

        self.run_bzr('merge ../a/', retcode=1, working_dir='b')

        self.assertPathExists('b/sub/a.txt.THIS')

        self.assertPathExists('b/sub/a.txt.BASE')

        self.run_bzr('merge ../b/', retcode=1, working_dir='a')

        self.assertPathExists('a/sub/a.txt.OTHER')

        self.assertPathExists('a/sub/a.txt.BASE')

    def test_conflict_leaves_base_this_other_files(self):

        tree, other = self.create_conflicting_branches()

        self.run_bzr('merge ../other', working_dir='tree',

                     retcode=1)

        self.assertFileEqual('a\nb\nc\n', 'tree/fname.BASE')

        self.assertFileEqual('a\nB\nD\n', 'tree/fname.OTHER')

        self.assertFileEqual('a\nB\nC\n', 'tree/fname.THIS')

    def test_weave_conflict_leaves_base_this_other_files(self):

        tree, other = self.create_conflicting_branches()

        self.run_bzr('merge ../other --weave', working_dir='tree',

                     retcode=1)

        self.assertFileEqual('a\nb\nc\n', 'tree/fname.BASE')

        self.assertFileEqual('a\nB\nD\n', 'tree/fname.OTHER')

        self.assertFileEqual('a\nB\nC\n', 'tree/fname.THIS')

    def test_merge_remember(self):

        """Merge changes from one branch to another, test submit location."""

        tree_a = self.make_branch_and_tree('branch_a')

        branch_a = tree_a.branch

        self.build_tree(['branch_a/a'])

        tree_a.add('a')

        tree_a.commit('commit a')

        branch_b = branch_a.bzrdir.sprout('branch_b').open_branch()

        tree_b = branch_b.bzrdir.open_workingtree()

        branch_c = branch_a.bzrdir.sprout('branch_c').open_branch()

        tree_c = branch_c.bzrdir.open_workingtree()

        self.build_tree(['branch_a/b'])

        tree_a.add('b')

        tree_a.commit('commit b')

        self.build_tree(['branch_c/c'])

        tree_c.add('c')

        tree_c.commit('commit c')

        # reset parent

        parent = branch_b.get_parent()

        branch_b.set_parent(None)

        self.assertEqual(None, branch_b.get_parent())

        # test merge for failure without parent set

        out = self.run_bzr('merge', retcode=3, working_dir='branch_b')

        self.assertEquals(out,

                ('','bzr: ERROR: No location specified or remembered\n'))

        # test uncommitted changes

        self.build_tree(['branch_b/d'])

        tree_b.add('d')

        self.run_bzr_error(['Working tree ".*" has uncommitted changes'],

                           'merge', working_dir='branch_b')

        # merge should now pass and implicitly remember merge location

        tree_b.commit('commit d')

        out, err = self.run_bzr('merge ../branch_a', working_dir='branch_b')

        base = urlutils.local_path_from_url(branch_a.base)

        self.assertEndsWith(err, '+N  b\nAll changes applied successfully.\n')

        self.assertEquals(osutils.abspath(branch_b.get_submit_branch()),

                          osutils.abspath(parent))

        # test implicit --remember when committing new file

        self.build_tree(['branch_b/e'])

        tree_b.add('e')

        tree_b.commit('commit e')

        out, err = self.run_bzr('merge', working_dir='branch_b')

        self.assertStartsWith(

            err, 'Merging from remembered submit location %s\n' % (base,))

        # re-open tree as external run_bzr modified it

        tree_b = branch_b.bzrdir.open_workingtree()

        tree_b.commit('merge branch_a')

        # test explicit --remember

        out, err = self.run_bzr('merge ../branch_c --remember',

                                working_dir='branch_b')

        self.assertEquals(out, '')

        self.assertEquals(err, '+N  c\nAll changes applied successfully.\n')

        self.assertEquals(osutils.abspath(branch_b.get_submit_branch()),

                          osutils.abspath(branch_c.bzrdir.root_transport.base))

        # re-open tree as external run_bzr modified it

        tree_b = branch_b.bzrdir.open_workingtree()

        tree_b.commit('merge branch_c')

    def test_merge_bundle(self):

        from bzrlib.testament import Testament

        tree_a = self.make_branch_and_tree('branch_a')

        self.build_tree_contents([('branch_a/a', 'hello')])

        tree_a.add('a')

        tree_a.commit('message')

        tree_b = tree_a.bzrdir.sprout('branch_b').open_workingtree()

        self.build_tree_contents([('branch_a/a', 'hey there')])

        tree_a.commit('message')

        self.build_tree_contents([('branch_b/a', 'goodbye')])

        tree_b.commit('message')

        self.run_bzr('bundle ../branch_a -o ../bundle', working_dir='branch_b')

        self.run_bzr('merge ../bundle', retcode=1, working_dir='branch_a')

        testament_a = Testament.from_revision(tree_a.branch.repository,

                                              tree_b.get_parent_ids()[0])

        testament_b = Testament.from_revision(tree_b.branch.repository,

                                              tree_b.get_parent_ids()[0])

        self.assertEqualDiff(testament_a.as_text(),

                         testament_b.as_text())

        tree_a.set_conflicts(conflicts.ConflictList())

        tree_a.commit('message')

        # it is legal to attempt to merge an already-merged bundle

        err = self.run_bzr('merge ../bundle', working_dir='branch_a')[1]

        # but it does nothing

        self.assertFalse(tree_a.changes_from(tree_a.basis_tree()).has_changed())

        self.assertEqual('Nothing to do.\n', err)

    def test_merge_uncommitted(self):

        """Check that merge --uncommitted behaves properly"""

        tree_a = self.make_branch_and_tree('a')

        self.build_tree(['a/file_1', 'a/file_2'])

        tree_a.add(['file_1', 'file_2'])

        tree_a.commit('commit 1')

        tree_b = tree_a.bzrdir.sprout('b').open_workingtree()

        self.assertPathExists('b/file_1')

        tree_a.rename_one('file_1', 'file_i')

        tree_a.commit('commit 2')

        tree_a.rename_one('file_2', 'file_ii')

        self.run_bzr('merge a --uncommitted -d b')

        self.assertPathExists('b/file_1')

        self.assertPathExists('b/file_ii')

        tree_b.revert()

        self.run_bzr_error(('Cannot use --uncommitted and --revision',),

                           'merge /a --uncommitted -r1 -d b')

    def test_merge_uncommitted_file(self):

        """It should be possible to merge changes from a single file."""

        tree_a = self.make_branch_and_tree('tree_a')

        tree_a.commit('initial commit')

        tree_a.bzrdir.sprout('tree_b')

        self.build_tree(['tree_a/file1', 'tree_a/file2'])

        tree_a.add(['file1', 'file2'])

        self.run_bzr(['merge', '--uncommitted', '../tree_a/file1'],

                     working_dir='tree_b')

        self.assertPathExists('tree_b/file1')

        self.assertPathDoesNotExist('tree_b/file2')

    def test_merge_nonexistent_file(self):

        """It should not be possible to merge changes from a file which

        does not exist."""

        tree_a = self.make_branch_and_tree('tree_a')

        self.build_tree_contents([('tree_a/file', 'bar\n')])

        tree_a.add(['file'])

        tree_a.commit('commit 1')

        self.run_bzr_error(('Path\(s\) do not exist: non/existing',),

                           ['merge', 'non/existing'], working_dir='tree_a')

    def pullable_branch(self):

        tree_a = self.make_branch_and_tree('a')

        self.build_tree_contents([('a/file', 'bar\n')])

        tree_a.add(['file'])

        self.id1 = tree_a.commit('commit 1')

        tree_b = self.make_branch_and_tree('b')

        tree_b.pull(tree_a.branch)

        self.build_tree_contents([('b/file', 'foo\n')])

        self.id2 = tree_b.commit('commit 2')

    def test_merge_pull(self):

        self.pullable_branch()

        (out, err) = self.run_bzr('merge --pull ../b', working_dir='a')

        self.assertContainsRe(out, 'Now on revision 2\\.')

        tree_a = workingtree.WorkingTree.open('a')

        self.assertEqual([self.id2], tree_a.get_parent_ids())

    def test_merge_pull_preview(self):

        self.pullable_branch()

        (out, err) = self.run_bzr('merge --pull --preview -d a b')

        self.assertThat(out, matchers.DocTestMatches(

"""=== modified file 'file'

--- file\t...

+++ file\t...

@@ -1,1 +1,1 @@

-bar

+foo

""", doctest.ELLIPSIS | doctest.REPORT_UDIFF))

        tree_a = workingtree.WorkingTree.open('a')

        self.assertEqual([self.id1], tree_a.get_parent_ids())

    def test_merge_kind_change(self):

        tree_a = self.make_branch_and_tree('tree_a')

        self.build_tree_contents([('tree_a/file', 'content_1')])

        tree_a.add('file', 'file-id')

        tree_a.commit('added file')

        tree_b = tree_a.bzrdir.sprout('tree_b').open_workingtree()

        os.unlink('tree_a/file')

        self.build_tree(['tree_a/file/'])

        tree_a.commit('changed file to directory')

        self.run_bzr('merge ../tree_a', working_dir='tree_b')

        self.assertEqual('directory', osutils.file_kind('tree_b/file'))

        tree_b.revert()

        self.assertEqual('file', osutils.file_kind('tree_b/file'))

        self.build_tree_contents([('tree_b/file', 'content_2')])

        tree_b.commit('content change')

        self.run_bzr('merge ../tree_a', retcode=1, working_dir='tree_b')

        self.assertEqual(tree_b.conflicts(),

                         [conflicts.ContentsConflict('file',

                                                     file_id='file-id')])

    def test_directive_cherrypick(self):

        source = self.make_branch_and_tree('source')

        source.commit("nothing")

        # see https://bugs.launchpad.net/bzr/+bug/409688 - trying to

        # cherrypick from one branch into another unrelated branch with a

        # different root id will give shape conflicts.  as a workaround we

        # make sure they share the same root id.

        target = source.bzrdir.sprout('target').open_workingtree()

        self.build_tree(['source/a'])

        source.add('a')

        source.commit('Added a', rev_id='rev1')

        self.build_tree(['source/b'])

        source.add('b')

        source.commit('Added b', rev_id='rev2')

        target.commit('empty commit')

        self.write_directive('directive', source.branch, 'target', 'rev2',

                             'rev1')

        out, err = self.run_bzr('merge -d target directive')

        self.assertPathDoesNotExist('target/a')

        self.assertPathExists('target/b')

        self.assertContainsRe(err, 'Performing cherrypick')

    def write_directive(self, filename, source, target, revision_id,

                        base_revision_id=None, mangle_patch=False):

        md = merge_directive.MergeDirective2.from_objects(

            source.repository, revision_id, 0, 0, target,

            base_revision_id=base_revision_id)

        if mangle_patch:

            md.patch = 'asdf\n'

        self.build_tree_contents([(filename, ''.join(md.to_lines()))])

    def test_directive_verify_warning(self):

        source = self.make_branch_and_tree('source')

        self.build_tree(['source/a'])

        source.add('a')

        source.commit('Added a', rev_id='rev1')

        target = self.make_branch_and_tree('target')

        target.commit('empty commit')

        self.write_directive('directive', source.branch, 'target', 'rev1')

        err = self.run_bzr('merge -d target directive')[1]

        self.assertNotContainsRe(err, 'Preview patch does not match changes')

        target.revert()

        self.write_directive('directive', source.branch, 'target', 'rev1',

                             mangle_patch=True)

        err = self.run_bzr('merge -d target directive')[1]

        self.assertContainsRe(err, 'Preview patch does not match changes')

    def test_merge_arbitrary(self):

        target = self.make_branch_and_tree('target')

        target.commit('empty')

        # We need a revision that has no integer revno

        branch_a = target.bzrdir.sprout('branch_a').open_workingtree()

        self.build_tree(['branch_a/file1'])

        branch_a.add('file1')

        branch_a.commit('added file1', rev_id='rev2a')

        branch_b = target.bzrdir.sprout('branch_b').open_workingtree()

        self.build_tree(['branch_b/file2'])

        branch_b.add('file2')

        branch_b.commit('added file2', rev_id='rev2b')

        branch_b.merge_from_branch(branch_a.branch)

        self.assertPathExists('branch_b/file1')

        branch_b.commit('merged branch_a', rev_id='rev3b')

        # It works if the revid has an interger revno

        self.run_bzr('merge -d target -r revid:rev2a branch_a')

        self.assertPathExists('target/file1')

        self.assertPathDoesNotExist('target/file2')

        target.revert()

        # It should work if the revid has no integer revno

        self.run_bzr('merge -d target -r revid:rev2a branch_b')

        self.assertPathExists('target/file1')

        self.assertPathDoesNotExist('target/file2')

    def assertDirectoryContent(self, directory, entries, message=''):

        """Assert whether entries (file or directories) exist in a directory.

        It also checks that there are no extra entries.

        """

        ondisk = os.listdir(directory)

        if set(ondisk) == set(entries):

            return

        if message:

            message += '\n'

        raise AssertionError(

            '%s"%s" directory content is different:\na = %s\nb = %s\n'

            % (message, directory, sorted(entries), sorted(ondisk)))

    def test_cherrypicking_merge(self):

        # make source branch

        source = self.make_branch_and_tree('source')

        for f in ('a', 'b', 'c', 'd'):

            self.build_tree(['source/'+f])

            source.add(f)

            source.commit('added '+f, rev_id='rev_'+f)

        # target branch

        target = source.bzrdir.sprout('target', 'rev_a').open_workingtree()

        self.assertDirectoryContent('target', ['.bzr', 'a'])

        # pick 1 revision

        self.run_bzr('merge -d target -r revid:rev_b..revid:rev_c source')

        self.assertDirectoryContent('target', ['.bzr', 'a', 'c'])

        target.revert()

        # pick 2 revisions

        self.run_bzr('merge -d target -r revid:rev_b..revid:rev_d source')

        self.assertDirectoryContent('target', ['.bzr', 'a', 'c', 'd'])

        target.revert()

        # pick 1 revision with option --changes

        self.run_bzr('merge -d target -c revid:rev_d source')

        self.assertDirectoryContent('target', ['.bzr', 'a', 'd'])

    def test_merge_criss_cross(self):

        tree_a = self.make_branch_and_tree('a')

        tree_a.commit('', rev_id='rev1')

        tree_b = tree_a.bzrdir.sprout('b').open_workingtree()

        tree_a.commit('', rev_id='rev2a')

        tree_b.commit('', rev_id='rev2b')

        tree_a.merge_from_branch(tree_b.branch)

        tree_b.merge_from_branch(tree_a.branch)

        tree_a.commit('', rev_id='rev3a')

        tree_b.commit('', rev_id='rev3b')

        graph = tree_a.branch.repository.get_graph(tree_b.branch.repository)

        out, err = self.run_bzr(['merge', '-d', 'a', 'b'])

        self.assertContainsRe(err, 'Warning: criss-cross merge encountered.')

    def test_merge_from_submit(self):

        tree_a = self.make_branch_and_tree('a')

        tree_a.commit('test')

        tree_b = tree_a.bzrdir.sprout('b').open_workingtree()

        tree_c = tree_a.bzrdir.sprout('c').open_workingtree()

        out, err = self.run_bzr(['merge', '-d', 'c'])

        self.assertContainsRe(err, 'Merging from remembered parent location .*a\/')

        tree_c.branch.set_submit_branch(tree_b.bzrdir.root_transport.base)

        out, err = self.run_bzr(['merge', '-d', 'c'])

        self.assertContainsRe(err, 'Merging from remembered submit location .*b\/')

    def test_remember_sets_submit(self):

        tree_a = self.make_branch_and_tree('a')

        tree_a.commit('rev1')

        tree_b = tree_a.bzrdir.sprout('b').open_workingtree()

        self.assertIs(tree_b.branch.get_submit_branch(), None)

        # Remember should not happen if using default from parent

        out, err = self.run_bzr(['merge', '-d', 'b'])

        self.assertIs(tree_b.branch.get_submit_branch(), None)