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bzrlib/benchmarks/tree_creator/heavily_merged.py
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# Copyright (C) 2006 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Tree creator for many commits, but no changes"""
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import errno
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import os
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from bzrlib import (
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    bzrdir,
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    )
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from bzrlib.benchmarks.tree_creator import TreeCreator
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class HeavilyMergedTreeCreator(TreeCreator):
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    """Create a tree in which almost every commit is a merge.
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    No file changes are included.  This produces two trees,
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    one of which is returned.  Except for the first commit, every
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    commit in its revision-history is a merge of another commit in the other
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    tree.
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    Not hardlinking the working tree, because there are no working tree files.
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    """
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    def __init__(self, test, link_bzr=True):
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        super(HeavilyMergedTreeCreator, self).__init__(test,
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            tree_name='heavily_merged_tree',
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            link_bzr=link_bzr,
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            link_working=False,
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            hot_cache=True)
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    def _create_tree(self, root, in_cache=False):
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        try:
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            os.mkdir(root)
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        except (IOError, OSError), e:
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            if e.errno not in (errno.EEXIST,):
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                raise
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        tree = bzrdir.BzrDir.create_standalone_workingtree(root)
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        tree.lock_write()
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        try:
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            tree2 = tree.bzrdir.sprout(root + '/tree2').open_workingtree()
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            tree2.lock_write()
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            try:
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                for i in xrange(250):
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                    revision_id = tree.commit('no-changes commit %d-a' % i)
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                    tree2.branch.fetch(tree.branch, revision_id)
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                    tree2.add_parent_tree_id(revision_id)
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                    revision_id = tree2.commit('no-changes commit %d-b' % i)
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                    tree.branch.fetch(tree2.branch, revision_id)
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                    tree.add_parent_tree_id(revision_id)
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                tree.set_parent_ids(tree.get_parent_ids()[:1])
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            finally:
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                tree2.unlock()
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        finally:
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            tree.unlock()
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        if in_cache:
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            self._protect_files(root+'/.bzr')
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        return tree
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