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# Copyright (C) 2006-2012 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Full history branch formats."""
from __future__ import absolute_import
from bzrlib import (
debug,
errors,
revision as _mod_revision,
)
from bzrlib.branch import (
Branch,
BranchFormatMetadir,
BzrBranch,
)
from bzrlib.decorators import (
needs_write_lock,
)
from bzrlib.trace import mutter_callsite
class FullHistoryBzrBranch(BzrBranch):
"""Bzr branch which contains the full revision history."""
@needs_write_lock
def set_last_revision_info(self, revno, revision_id):
if not revision_id or not isinstance(revision_id, basestring):
raise errors.InvalidRevisionId(revision_id=revision_id, branch=self)
revision_id = _mod_revision.ensure_null(revision_id)
# this old format stores the full history, but this api doesn't
# provide it, so we must generate, and might as well check it's
# correct
history = self._lefthand_history(revision_id)
if len(history) != revno:
raise AssertionError('%d != %d' % (len(history), revno))
self._set_revision_history(history)
def _read_last_revision_info(self):
rh = self._revision_history()
revno = len(rh)
if revno:
return (revno, rh[-1])
else:
return (0, _mod_revision.NULL_REVISION)
def _set_revision_history(self, rev_history):
if 'evil' in debug.debug_flags:
mutter_callsite(3, "set_revision_history scales with history.")
check_not_reserved_id = _mod_revision.check_not_reserved_id
for rev_id in rev_history:
check_not_reserved_id(rev_id)
if Branch.hooks['post_change_branch_tip']:
# Don't calculate the last_revision_info() if there are no hooks
# that will use it.
old_revno, old_revid = self.last_revision_info()
if len(rev_history) == 0:
revid = _mod_revision.NULL_REVISION
else:
revid = rev_history[-1]
self._run_pre_change_branch_tip_hooks(len(rev_history), revid)
self._write_revision_history(rev_history)
self._clear_cached_state()
self._cache_revision_history(rev_history)
if Branch.hooks['post_change_branch_tip']:
self._run_post_change_branch_tip_hooks(old_revno, old_revid)
def _write_revision_history(self, history):
"""Factored out of set_revision_history.
This performs the actual writing to disk.
It is intended to be called by set_revision_history."""
self._transport.put_bytes(
'revision-history', '\n'.join(history),
mode=self.bzrdir._get_file_mode())
def _gen_revision_history(self):
history = self._transport.get_bytes('revision-history').split('\n')
if history[-1:] == ['']:
# There shouldn't be a trailing newline, but just in case.
history.pop()
return history
def _synchronize_history(self, destination, revision_id):
if not isinstance(destination, FullHistoryBzrBranch):
super(BzrBranch, self)._synchronize_history(
destination, revision_id)
return
if revision_id == _mod_revision.NULL_REVISION:
new_history = []
else:
new_history = self._revision_history()
if revision_id is not None and new_history != []:
try:
new_history = new_history[:new_history.index(revision_id) + 1]
except ValueError:
rev = self.repository.get_revision(revision_id)
new_history = rev.get_history(self.repository)[1:]
destination._set_revision_history(new_history)
@needs_write_lock
def generate_revision_history(self, revision_id, last_rev=None,
other_branch=None):
"""Create a new revision history that will finish with revision_id.
:param revision_id: the new tip to use.
:param last_rev: The previous last_revision. If not None, then this
must be a ancestory of revision_id, or DivergedBranches is raised.
:param other_branch: The other branch that DivergedBranches should
raise with respect to.
"""
self._set_revision_history(self._lefthand_history(revision_id,
last_rev, other_branch))
class BzrBranch5(FullHistoryBzrBranch):
"""A format 5 branch. This supports new features over plain branches.
It has support for a master_branch which is the data for bound branches.
"""
class BzrBranchFormat5(BranchFormatMetadir):
"""Bzr branch format 5.
This format has:
- a revision-history file.
- a format string
- a lock dir guarding the branch itself
- all of this stored in a branch/ subdirectory
- works with shared repositories.
This format is new in bzr 0.8.
"""
def _branch_class(self):
return BzrBranch5
@classmethod
def get_format_string(cls):
"""See BranchFormat.get_format_string()."""
return "Bazaar-NG branch format 5\n"
def get_format_description(self):
"""See BranchFormat.get_format_description()."""
return "Branch format 5"
def initialize(self, a_bzrdir, name=None, repository=None,
append_revisions_only=None):
"""Create a branch of this format in a_bzrdir."""
if append_revisions_only:
raise errors.UpgradeRequired(a_bzrdir.user_url)
utf8_files = [('revision-history', ''),
('branch-name', ''),
]
return self._initialize_helper(a_bzrdir, utf8_files, name, repository)
def supports_tags(self):
return False
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