~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2006 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

"""Tree creator for many commits, but no changes"""

import errno

import os

from bzrlib import (

    bzrdir,

    )

from bzrlib.benchmarks.tree_creator import TreeCreator

class HeavilyMergedTreeCreator(TreeCreator):

    """Create a tree in which almost every commit is a merge.

    No file changes are included.  This produces two trees, 

    one of which is returned.  Except for the first commit, every

    commit in its revision-history is a merge of another commit in the other

    tree.  

    Not hardlinking the working tree, because there are no working tree files.

    """

    def __init__(self, test, link_bzr=True):

        super(HeavilyMergedTreeCreator, self).__init__(test,

            tree_name='heavily_merged_tree',

            link_bzr=link_bzr,

            link_working=False,

            hot_cache=True)

    def _create_tree(self, root, in_cache=False):

        try:

            os.mkdir(root)

        except (IOError, OSError), e:

            if e.errno not in (errno.EEXIST,):

                raise

        tree = bzrdir.BzrDir.create_standalone_workingtree(root)

        tree.lock_write()

        try:

            tree2 = tree.bzrdir.sprout(root + '/tree2').open_workingtree()

            tree2.lock_write()

            try:

                for i in xrange(250):

                    revision_id = tree.commit('no-changes commit %d-a' % i)

                    tree2.branch.fetch(tree.branch, revision_id)

                    tree2.add_parent_tree_id(revision_id)

                    revision_id = tree2.commit('no-changes commit %d-b' % i)

                    tree.branch.fetch(tree2.branch, revision_id)

                    tree.add_parent_tree_id(revision_id)

                tree.set_parent_ids(tree.get_parent_ids()[:1])

            finally:

                tree2.unlock()

        finally:

            tree.unlock()

        if in_cache:

            self._protect_files(root+'/.bzr')

        return tree