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# 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
"""Utility for create branches with particular contents."""
from bzrlib import bzrdir, errors, memorytree
class BranchBuilder(object):
"""A BranchBuilder aids creating Branches with particular shapes.
The expected way to use BranchBuilder is to construct a
BranchBuilder on the transport you want your branch on, and then call
appropriate build_ methods on it to get the shape of history you want.
For instance:
builder = BranchBuilder(self.get_transport().clone('relpath'))
builder.build_commit()
builder.build_commit()
builder.build_commit()
branch = builder.get_branch()
"""
def __init__(self, transport, format=None):
"""Construct a BranchBuilder on transport.
:param transport: The transport the branch should be created on.
If the path of the transport does not exist but its parent does
it will be created.
:param format: The name of a format in the bzrdir format registry
for the branch to be built.
"""
if not transport.has('.'):
transport.mkdir('.')
if format is None:
format = 'default'
self._branch = bzrdir.BzrDir.create_branch_convenience(transport.base,
format=bzrdir.format_registry.make_bzrdir(format))
def build_commit(self):
"""Build a commit on the branch."""
tree = memorytree.MemoryTree.create_on_branch(self._branch)
tree.lock_write()
try:
tree.add('')
return tree.commit('commit %d' % (self._branch.revno() + 1))
finally:
tree.unlock()
def get_branch(self):
"""Return the branch created by the builder."""
return self._branch
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