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# Copyright (C) 2007 Canonical Ltd.
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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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# 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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# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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from bzrlib import errors, merge
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from bzrlib.branch import Branch, BranchFormat, BranchReferenceFormat
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from bzrlib.bzrdir import BzrDir
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from bzrlib.trace import note
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def switch(control_dir, to_branch):
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source_repository = control_dir.open_branch().repository
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except errors.NotBranchError:
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source_repository = to_branch.repository
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set_branch_location(control_dir, to_branch)
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tree = control_dir.open_workingtree()
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_update(tree, source_repository, to_branch)
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def _update(tree, source_repository, to_branch):
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tree.lock_tree_write()
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if tree.last_revision() == tree.branch.last_revision():
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note("Tree is up to date.")
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base_tree = source_repository.revision_tree(tree.last_revision())
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merge.Merge3Merger(tree, tree, base_tree, to_branch.basis_tree())
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tree.set_last_revision(to_branch.last_revision())
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note('Updated to revision %d' % tree.branch.revno())
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def _check_switch_branch_format(control):
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branch_format = BranchFormat.find_format(control)
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format_string = branch_format.get_format_string()
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if not format_string.startswith("Bazaar-NG Branch Reference Format "):
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raise errors.BzrCommandError(
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'The switch command can only be used on a lightweight checkout.\n'
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'Expected branch reference, found %s at %s' % (
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format_string.strip(), control.root_transport.base))
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if not format_string == BranchReferenceFormat().get_format_string():
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raise errors.BzrCommandError(
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'Unsupported: %r' % (format_string.strip(),))
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def set_branch_location(control, to_branch):
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"""Set location value of a branch reference.
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:param control: BzrDir containing the branch reference
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:param location: value to write to the branch reference location.
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_check_switch_branch_format(control)
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branch_format = BranchFormat.find_format(control)
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transport = control.get_branch_transport(None)
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location = transport.put_bytes('location', to_branch.base)