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# Copyright (c) 2009 Jiri Svoboda
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# - Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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# derived from this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Main Branch Protection plugin for Bazaar."""
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# This plugin employs the pre_change_branch_tip hook to protect the main
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# branch (a.k.a. linear history) of bzr repositories from unwanted change,
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# effectively making the main branch append-only.
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# Specifically we verify that the new main branch contains the old tip.
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# This prevents a branch from inadvertently aquiring the tip of another branch.
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# Install this plugin in ~/.bazaar/plugins/mbprotect
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# See also http://trac.helenos.org/trac.fcgi/wiki/BazaarWorkflow
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from bzrlib.errors import TipChangeRejected
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def pre_change_branch_tip(params):
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repo = params.branch.repository
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# Check if the old repository was empty.
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if params.old_revid == 'null:':
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# Look for old tip in new main branch.
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for revision_id in repo.iter_reverse_revision_history(params.new_revid):
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if revision_id == params.old_revid:
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return # Found old tip
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# Old tip was not found. Reject the change.
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raise TipChangeRejected('Bad tip. Read http://trac.helenos.org/trac.fcgi/' +
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'wiki/BazaarWorkflow')
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bzrlib.branch.Branch.hooks.install_named_hook('pre_change_branch_tip',
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pre_change_branch_tip, 'MB-Protect tip check')