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Viewing changes to bzrlib/branchfmt/fullhistory.py

  • Committer: Patch Queue Manager
  • Date: 2012-07-10 11:26:46 UTC
  • mfrom: (6535.1.1 trunk)
  • Revision ID: pqm@pqm.ubuntu.com-20120710112646-82a24oyibuwi0ofl
(vila) Release 2.6b2 (Vincent Ladeuil)

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bzrlib/branchfmt/fullhistory.py
 
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# Copyright (C) 2006-2012 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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"""Full history branch formats."""
 
18
 
 
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from __future__ import absolute_import
 
20
 
 
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from bzrlib import (
 
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    debug,
 
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    errors,
 
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    revision as _mod_revision,
 
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    )
 
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from bzrlib.branch import (
 
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    Branch,
 
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    BranchFormatMetadir,
 
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    BzrBranch,
 
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    )
 
32
 
 
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from bzrlib.decorators import (
 
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    needs_write_lock,
 
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    )
 
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from bzrlib.trace import mutter_callsite
 
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38
 
 
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class FullHistoryBzrBranch(BzrBranch):
 
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    """Bzr branch which contains the full revision history."""
 
41
 
 
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    @needs_write_lock
 
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    def set_last_revision_info(self, revno, revision_id):
 
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        if not revision_id or not isinstance(revision_id, basestring):
 
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            raise errors.InvalidRevisionId(revision_id=revision_id, branch=self)
 
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        revision_id = _mod_revision.ensure_null(revision_id)
 
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        # this old format stores the full history, but this api doesn't
 
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        # provide it, so we must generate, and might as well check it's
 
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        # correct
 
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        history = self._lefthand_history(revision_id)
 
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        if len(history) != revno:
 
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            raise AssertionError('%d != %d' % (len(history), revno))
 
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        self._set_revision_history(history)
 
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    def _read_last_revision_info(self):
 
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        rh = self._revision_history()
 
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        revno = len(rh)
 
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        if revno:
 
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            return (revno, rh[-1])
 
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        else:
 
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            return (0, _mod_revision.NULL_REVISION)
 
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    def _set_revision_history(self, rev_history):
 
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        if 'evil' in debug.debug_flags:
 
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            mutter_callsite(3, "set_revision_history scales with history.")
 
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        check_not_reserved_id = _mod_revision.check_not_reserved_id
 
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        for rev_id in rev_history:
 
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            check_not_reserved_id(rev_id)
 
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        if Branch.hooks['post_change_branch_tip']:
 
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            # Don't calculate the last_revision_info() if there are no hooks
 
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            # that will use it.
 
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            old_revno, old_revid = self.last_revision_info()
 
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        if len(rev_history) == 0:
 
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            revid = _mod_revision.NULL_REVISION
 
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        else:
 
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            revid = rev_history[-1]
 
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        self._run_pre_change_branch_tip_hooks(len(rev_history), revid)
 
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        self._write_revision_history(rev_history)
 
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        self._clear_cached_state()
 
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        self._cache_revision_history(rev_history)
 
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        if Branch.hooks['post_change_branch_tip']:
 
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            self._run_post_change_branch_tip_hooks(old_revno, old_revid)
 
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    def _write_revision_history(self, history):
 
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        """Factored out of set_revision_history.
 
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        This performs the actual writing to disk.
 
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        It is intended to be called by set_revision_history."""
 
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        self._transport.put_bytes(
 
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            'revision-history', '\n'.join(history),
 
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            mode=self.bzrdir._get_file_mode())
 
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    def _gen_revision_history(self):
 
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        history = self._transport.get_bytes('revision-history').split('\n')
 
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        if history[-1:] == ['']:
 
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            # There shouldn't be a trailing newline, but just in case.
 
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            history.pop()
 
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        return history
 
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    def _synchronize_history(self, destination, revision_id):
 
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        if not isinstance(destination, FullHistoryBzrBranch):
 
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            super(BzrBranch, self)._synchronize_history(
 
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                destination, revision_id)
 
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            return
 
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        if revision_id == _mod_revision.NULL_REVISION:
 
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            new_history = []
 
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        else:
 
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            new_history = self._revision_history()
 
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        if revision_id is not None and new_history != []:
 
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            try:
 
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                new_history = new_history[:new_history.index(revision_id) + 1]
 
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            except ValueError:
 
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                rev = self.repository.get_revision(revision_id)
 
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                new_history = rev.get_history(self.repository)[1:]
 
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        destination._set_revision_history(new_history)
 
116
 
 
117
    @needs_write_lock
 
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    def generate_revision_history(self, revision_id, last_rev=None,
 
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        other_branch=None):
 
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        """Create a new revision history that will finish with revision_id.
 
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        :param revision_id: the new tip to use.
 
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        :param last_rev: The previous last_revision. If not None, then this
 
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            must be a ancestory of revision_id, or DivergedBranches is raised.
 
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        :param other_branch: The other branch that DivergedBranches should
 
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            raise with respect to.
 
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        """
 
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        self._set_revision_history(self._lefthand_history(revision_id,
 
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            last_rev, other_branch))
 
130
 
 
131
 
 
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class BzrBranch5(FullHistoryBzrBranch):
 
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    """A format 5 branch. This supports new features over plain branches.
 
134
 
 
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    It has support for a master_branch which is the data for bound branches.
 
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    """
 
137
 
 
138
 
 
139
class BzrBranchFormat5(BranchFormatMetadir):
 
140
    """Bzr branch format 5.
 
141
 
 
142
    This format has:
 
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     - a revision-history file.
 
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     - a format string
 
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     - a lock dir guarding the branch itself
 
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     - all of this stored in a branch/ subdirectory
 
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     - works with shared repositories.
 
148
 
 
149
    This format is new in bzr 0.8.
 
150
    """
 
151
 
 
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    def _branch_class(self):
 
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        return BzrBranch5
 
154
 
 
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    @classmethod
 
156
    def get_format_string(cls):
 
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        """See BranchFormat.get_format_string()."""
 
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        return "Bazaar-NG branch format 5\n"
 
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160
    def get_format_description(self):
 
161
        """See BranchFormat.get_format_description()."""
 
162
        return "Branch format 5"
 
163
 
 
164
    def initialize(self, a_bzrdir, name=None, repository=None,
 
165
                   append_revisions_only=None):
 
166
        """Create a branch of this format in a_bzrdir."""
 
167
        if append_revisions_only:
 
168
            raise errors.UpgradeRequired(a_bzrdir.user_url)
 
169
        utf8_files = [('revision-history', ''),
 
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                      ('branch-name', ''),
 
171
                      ]
 
172
        return self._initialize_helper(a_bzrdir, utf8_files, name, repository)
 
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174
    def supports_tags(self):
 
175
        return False
 
176
 
 
177
 
 
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