| 1 | #
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| 2 | # Copyright (c) 2009 Jiri Svoboda
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | """Main Branch Protection plugin for Bazaar."""
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| 30 |
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| 31 | #
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| 32 | # This plugin employs the pre_change_branch_tip hook to protect the main
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| 33 | # branch (a.k.a. linear history) of bzr repositories from unwanted change,
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| 34 | # effectively making the main branch append-only.
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| 35 | #
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| 36 | # Specifically we verify that the new main branch contains the old tip.
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| 37 | # This prevents a branch from inadvertently aquiring the tip of another branch.
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| 38 | #
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| 39 | # Install this plugin in ~/.bazaar/plugins/mbprotect
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| 40 | #
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| 41 | # See also http://trac.helenos.org/trac.fcgi/wiki/BazaarWorkflow
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| 42 | #
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| 43 |
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| 44 | import bzrlib.branch
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| 45 | from bzrlib.errors import TipChangeRejected
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| 46 |
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| 47 | def pre_change_branch_tip(params):
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| 48 | repo = params.branch.repository
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| 49 |
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| 50 | # Check if the old repository was empty.
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| 51 | if params.old_revid == 'null:':
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| 52 | return
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| 53 |
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| 54 | # First permitted case is appending changesets to main branch.Look for
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| 55 | # old tip in new main branch.
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| 56 | for revision_id in repo.iter_reverse_revision_history(params.new_revid):
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| 57 | if revision_id == params.old_revid:
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| 58 | return # Found old tip
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| 59 |
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| 60 | # Another permitted case is backing out changesets. Look for new tip
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| 61 | # in old branch.
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| 62 | for revision_id in repo.iter_reverse_revision_history(params.old_revid):
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| 63 | if revision_id == params.new_revid:
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| 64 | return # Found new tip
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| 65 |
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| 66 | # Trying to do something else. Reject the change.
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| 67 | raise TipChangeRejected('Bad tip. Read http://trac.helenos.org/wiki/BazaarWorkflow')
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| 68 |
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| 69 | # Install hook.
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| 70 | bzrlib.branch.Branch.hooks.install_named_hook('pre_change_branch_tip',
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| 71 | pre_change_branch_tip, 'MB-Protect tip check')
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