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# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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
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