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# Copyright (C) 2006-2009 Jelmer Vernooij <jelmer@samba.org>
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Subversion cache directory access."""
import os
import sys
import threading
import weakref
import bzrlib
from bzrlib import (
osutils,
trace,
transport as _mod_transport,
)
from bzrlib.config import (
config_dir,
ensure_config_dir_exists,
)
from bzrlib.plugins.svn import version_info
class CacheConcurrencyError(Exception):
"""Unable to access cache while write is in progress."""
def write_cache_readme(path):
f = open(path, 'w')
try:
f.write(
"""This directory contains information cached by the bzr-svn plugin.
It is used for performance reasons only and can be removed
without losing data.
See http://bazaar-vcs.org/BzrForeignBranches/Subversion for details.
""")
if version_info[3] == 'exp':
f.write("This is the directory used by the experimental version of bzr-svn.\n")
finally:
f.close()
def create_cache_dir():
"""Create the top-level bzr-svn cache directory.
:return: Path to cache directory, as byte string.
"""
ensure_config_dir_exists()
if version_info[3] == 'exp':
name = 'svn-cache-exp'
else:
name = 'svn-cache'
if sys.platform in ("nt", "win32"):
from bzrlib.win32utils import get_local_appdata_location
s = get_local_appdata_location()
assert s is not None
# This can return a unicode string or a plain string in
# user encoding
if type(s) == str:
s = s.decode(bzrlib.user_encoding)
base_cache_dir = s.encode(osutils._fs_enc)
cache_dir = os.path.join(base_cache_dir, name)
else:
base_cache_dir = config_dir()
cache_dir = os.path.join(base_cache_dir, name)
# Check and use old location if possible
if not os.path.exists(cache_dir):
try:
from xdg.BaseDirectory import xdg_cache_home
except ImportError:
pass
else:
cache_dir = os.path.join(xdg_cache_home, "bazaar", "svn")
if type(cache_dir) == unicode:
cache_dir = cache_dir.encode(osutils._fs_enc)
if not os.path.exists(cache_dir):
os.makedirs(cache_dir)
write_cache_readme(os.path.join(cache_dir, "README"))
return cache_dir
_cachedbs = threading.local()
def cachedbs():
"""Get a cache for this thread's db connections."""
try:
return _cachedbs.cache
except AttributeError:
_cachedbs.cache = weakref.WeakValueDictionary()
return _cachedbs.cache
class RepositoryCache(object):
"""Object that provides a cache related to a particular UUID."""
def __init__(self, uuid):
self.uuid = uuid
def create_cache_dir(self):
cache_dir = create_cache_dir()
assert isinstance(cache_dir, str)
dir = os.path.join(cache_dir, self.uuid)
if not os.path.exists(dir):
trace.note("Initialising Subversion metadata cache in %s.",
dir.decode(osutils._fs_enc))
os.mkdir(dir)
return dir
def open_transport(self):
return _mod_transport.get_transport_from_path(
self.create_cache_dir().decode(osutils._fs_enc))
def open_fileid_map(self):
from bzrlib.plugins.svn.fileids import FileIdMapCache
return FileIdMapCache(self.open_transport())
def open_revid_map(self):
raise NotImplementedError(self.open_revid_map)
def open_logwalker(self):
raise NotImplementedError(self.open_logwalker)
def open_revision_cache(self):
raise NotImplementedError(self.open_revision_cache)
def open_parents(self):
raise NotImplementedError(self.open_parents)
def commit(self):
pass
try:
from bzrlib.plugins.svn.cache.tdbcache import TdbRepositoryCache
cache_cls = TdbRepositoryCache
except ImportError:
from bzrlib.plugins.svn.cache.sqlitecache import SqliteRepositoryCache
cache_cls = SqliteRepositoryCache
def get_cache(uuid):
try:
return cachedbs()[uuid]
except KeyError:
db = cache_cls(uuid)
cachedbs()[uuid] = db
return db
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