~bzr-pqm/bzr/bzr.dev

# 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

"""Helper classes for repository implementation tests."""

from cStringIO import StringIO

from bzrlib import (

    inventory,

    osutils,

    revision as _mod_revision,

    )

from bzrlib.repofmt.knitrepo import RepositoryFormatKnit

from bzrlib.tests.repository_implementations import TestCaseWithRepository

from bzrlib.tests import TestNotApplicable

class TestCaseWithBrokenRevisionIndex(TestCaseWithRepository):

    def make_repo_with_extra_ghost_index(self):

        """Make a corrupt repository.

        It will contain one revision, 'revision-id'.  The knit index will claim

        that it has one parent, 'incorrect-parent', but the revision text will

        claim it has no parents.

        Note: only the *cache* of the knit index is corrupted.  Thus the

        corruption will only last while the repository is locked.  For this

        reason, the returned repo is locked.

        """

        if not isinstance(self.repository_format, RepositoryFormatKnit):

            # XXX: Broken revision graphs can happen to weaves too, but they're

            # pretty deprecated.  Ideally these tests should apply to any repo

            # where repo.revision_graph_can_have_wrong_parents() is True, but

            # at the moment we only know how to corrupt knit repos.

            raise TestNotApplicable(

                "%s isn't a knit format" % self.repository_format)

        repo = self.make_repository('broken')

        repo.lock_write()

        repo.start_write_group()

        try:

            inv = inventory.Inventory(revision_id='revision-id')

            inv.root.revision = 'revision-id'

            inv_sha1 = repo.add_inventory('revision-id', inv, [])

            if repo.supports_rich_root():

                root_id = inv.root.file_id

                repo.texts.add_lines((root_id, 'revision-id'), [], [])

            revision = _mod_revision.Revision('revision-id',

                committer='jrandom@example.com', timestamp=0,

                inventory_sha1=inv_sha1, timezone=0, message='message',

                parent_ids=[])

            # Manually add the revision text using the RevisionStore API, with

            # bad parents.

            rev_text = repo._serializer.write_revision_to_string(revision)

            repo.revisions.add_lines((revision.revision_id,),

                [('incorrect-parent',)],

                osutils.split_lines(rev_text))

        except:

            repo.abort_write_group()

            repo.unlock()

            raise

        else:

            repo.commit_write_group()

            repo.unlock()

        repo.lock_write()

        self.addCleanup(repo.unlock)

        return repo