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# Copyright (C) 2007-2011 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
"""WorkingTree3 format and implementation.
"""
from __future__ import absolute_import
import errno
from bzrlib import (
bzrdir,
errors,
hashcache,
inventory,
revision as _mod_revision,
trace,
transform,
)
from bzrlib.decorators import (
needs_read_lock,
)
from bzrlib.lockable_files import LockableFiles
from bzrlib.lockdir import LockDir
from bzrlib.transport.local import LocalTransport
from bzrlib.workingtree import (
InventoryWorkingTree,
WorkingTreeFormatMetaDir,
)
class PreDirStateWorkingTree(InventoryWorkingTree):
def __init__(self, basedir='.', *args, **kwargs):
super(PreDirStateWorkingTree, self).__init__(basedir, *args, **kwargs)
# update the whole cache up front and write to disk if anything changed;
# in the future we might want to do this more selectively
# two possible ways offer themselves : in self._unlock, write the cache
# if needed, or, when the cache sees a change, append it to the hash
# cache file, and have the parser take the most recent entry for a
# given path only.
wt_trans = self.bzrdir.get_workingtree_transport(None)
cache_filename = wt_trans.local_abspath('stat-cache')
self._hashcache = hashcache.HashCache(basedir, cache_filename,
self.bzrdir._get_file_mode(),
self._content_filter_stack_provider())
hc = self._hashcache
hc.read()
# is this scan needed ? it makes things kinda slow.
#hc.scan()
if hc.needs_write:
trace.mutter("write hc")
hc.write()
def _write_hashcache_if_dirty(self):
"""Write out the hashcache if it is dirty."""
if self._hashcache.needs_write:
try:
self._hashcache.write()
except OSError, e:
if e.errno not in (errno.EPERM, errno.EACCES):
raise
# TODO: jam 20061219 Should this be a warning? A single line
# warning might be sufficient to let the user know what
# is going on.
trace.mutter('Could not write hashcache for %s\nError: %s',
self._hashcache.cache_file_name(), e)
@needs_read_lock
def get_file_sha1(self, file_id, path=None, stat_value=None):
if not path:
path = self._inventory.id2path(file_id)
return self._hashcache.get_sha1(path, stat_value)
class WorkingTree3(PreDirStateWorkingTree):
"""This is the Format 3 working tree.
This differs from the base WorkingTree by:
- having its own file lock
- having its own last-revision property.
This is new in bzr 0.8
"""
@needs_read_lock
def _last_revision(self):
"""See Mutable.last_revision."""
try:
return self._transport.get_bytes('last-revision')
except errors.NoSuchFile:
return _mod_revision.NULL_REVISION
def _change_last_revision(self, revision_id):
"""See WorkingTree._change_last_revision."""
if revision_id is None or revision_id == _mod_revision.NULL_REVISION:
try:
self._transport.delete('last-revision')
except errors.NoSuchFile:
pass
return False
else:
self._transport.put_bytes('last-revision', revision_id,
mode=self.bzrdir._get_file_mode())
return True
def _get_check_refs(self):
"""Return the references needed to perform a check of this tree."""
return [('trees', self.last_revision())]
def unlock(self):
if self._control_files._lock_count == 1:
# do non-implementation specific cleanup
self._cleanup()
# _inventory_is_modified is always False during a read lock.
if self._inventory_is_modified:
self.flush()
self._write_hashcache_if_dirty()
# reverse order of locking.
try:
return self._control_files.unlock()
finally:
self.branch.unlock()
class WorkingTreeFormat3(WorkingTreeFormatMetaDir):
"""The second working tree format updated to record a format marker.
This format:
- exists within a metadir controlling .bzr
- includes an explicit version marker for the workingtree control
files, separate from the ControlDir format
- modifies the hash cache format
- is new in bzr 0.8
- uses a LockDir to guard access for writes.
"""
upgrade_recommended = True
missing_parent_conflicts = True
supports_versioned_directories = True
@classmethod
def get_format_string(cls):
"""See WorkingTreeFormat.get_format_string()."""
return "Bazaar-NG Working Tree format 3"
def get_format_description(self):
"""See WorkingTreeFormat.get_format_description()."""
return "Working tree format 3"
_tree_class = WorkingTree3
def __get_matchingbzrdir(self):
return bzrdir.BzrDirMetaFormat1()
_matchingbzrdir = property(__get_matchingbzrdir)
def _open_control_files(self, a_bzrdir):
transport = a_bzrdir.get_workingtree_transport(None)
return LockableFiles(transport, 'lock', LockDir)
def initialize(self, a_bzrdir, revision_id=None, from_branch=None,
accelerator_tree=None, hardlink=False):
"""See WorkingTreeFormat.initialize().
:param revision_id: if supplied, create a working tree at a different
revision than the branch is at.
:param accelerator_tree: A tree which can be used for retrieving file
contents more quickly than the revision tree, i.e. a workingtree.
The revision tree will be used for cases where accelerator_tree's
content is different.
:param hardlink: If true, hard-link files from accelerator_tree,
where possible.
"""
if not isinstance(a_bzrdir.transport, LocalTransport):
raise errors.NotLocalUrl(a_bzrdir.transport.base)
transport = a_bzrdir.get_workingtree_transport(self)
control_files = self._open_control_files(a_bzrdir)
control_files.create_lock()
control_files.lock_write()
transport.put_bytes('format', self.get_format_string(),
mode=a_bzrdir._get_file_mode())
if from_branch is not None:
branch = from_branch
else:
branch = a_bzrdir.open_branch()
if revision_id is None:
revision_id = _mod_revision.ensure_null(branch.last_revision())
# WorkingTree3 can handle an inventory which has a unique root id.
# as of bzr 0.12. However, bzr 0.11 and earlier fail to handle
# those trees. And because there isn't a format bump inbetween, we
# are maintaining compatibility with older clients.
# inv = Inventory(root_id=gen_root_id())
inv = self._initial_inventory()
wt = self._tree_class(a_bzrdir.root_transport.local_abspath('.'),
branch,
inv,
_internal=True,
_format=self,
_bzrdir=a_bzrdir,
_control_files=control_files)
wt.lock_tree_write()
try:
basis_tree = branch.repository.revision_tree(revision_id)
# only set an explicit root id if there is one to set.
if basis_tree.inventory.root is not None:
wt.set_root_id(basis_tree.get_root_id())
if revision_id == _mod_revision.NULL_REVISION:
wt.set_parent_trees([])
else:
wt.set_parent_trees([(revision_id, basis_tree)])
transform.build_tree(basis_tree, wt)
finally:
# Unlock in this order so that the unlock-triggers-flush in
# WorkingTree is given a chance to fire.
control_files.unlock()
wt.unlock()
return wt
def _initial_inventory(self):
return inventory.Inventory()
def open(self, a_bzrdir, _found=False):
"""Return the WorkingTree object for a_bzrdir
_found is a private parameter, do not use it. It is used to indicate
if format probing has already been done.
"""
if not _found:
# we are being called directly and must probe.
raise NotImplementedError
if not isinstance(a_bzrdir.transport, LocalTransport):
raise errors.NotLocalUrl(a_bzrdir.transport.base)
wt = self._open(a_bzrdir, self._open_control_files(a_bzrdir))
return wt
def _open(self, a_bzrdir, control_files):
"""Open the tree itself.
:param a_bzrdir: the dir for the tree.
:param control_files: the control files for the tree.
"""
return self._tree_class(a_bzrdir.root_transport.local_abspath('.'),
_internal=True,
_format=self,
_bzrdir=a_bzrdir,
_control_files=control_files)
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