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# Copyright (C) 2005 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Implementation of Transport for the local filesystem.
"""
from bzrlib.transport import Transport, register_transport, \
TransportError, NoSuchFile, FileExists
import os, errno
class LocalTransportError(TransportError):
pass
class LocalTransport(Transport):
"""This is the transport agent for local filesystem access."""
def __init__(self, base):
"""Set the base path where files will be stored."""
if base.startswith('file://'):
base = base[7:]
# realpath is incompatible with symlinks. When we traverse
# up we might be able to normpath stuff. RBC 20051003
super(LocalTransport, self).__init__(
os.path.normpath(os.path.abspath(base)))
def should_cache(self):
return False
def clone(self, offset=None):
"""Return a new LocalTransport with root at self.base + offset
Because the local filesystem does not require a connection,
we can just return a new object.
"""
if offset is None:
return LocalTransport(self.base)
else:
return LocalTransport(self.abspath(offset))
def abspath(self, relpath):
"""Return the full url to the given relative path.
This can be supplied with a string or a list
"""
if isinstance(relpath, basestring):
relpath = [relpath]
return os.path.join(self.base, *relpath)
def relpath(self, abspath):
"""Return the local path portion from a given absolute path.
"""
from bzrlib.branch import _relpath
return _relpath(self.base, abspath)
def has(self, relpath):
return os.access(self.abspath(relpath), os.F_OK)
def get(self, relpath):
"""Get the file at the given relative path.
:param relpath: The relative path to the file
"""
try:
path = self.abspath(relpath)
return open(path, 'rb')
except IOError,e:
if e.errno == errno.ENOENT:
raise NoSuchFile('File %r does not exist' % path, orig_error=e)
raise LocalTransportError(orig_error=e)
def get_partial(self, relpath, start, length=None):
"""Get just part of a file.
:param relpath: Path to the file, relative to base
:param start: The starting position to read from
:param length: The length to read. A length of None indicates
read to the end of the file.
:return: A file-like object containing at least the specified bytes.
Some implementations may return objects which can be read
past this length, but this is not guaranteed.
"""
# LocalTransport.get_partial() doesn't care about the length
# argument, because it is using a local file, and thus just
# returns the file seek'ed to the appropriate location.
try:
path = self.abspath(relpath)
f = open(path, 'rb')
f.seek(start, 0)
return f
except IOError,e:
if e.errno == errno.ENOENT:
raise NoSuchFile('File %r does not exist' % path, orig_error=e)
raise LocalTransportError(orig_error=e)
def put(self, relpath, f):
"""Copy the file-like or string object into the location.
:param relpath: Location to put the contents, relative to base.
:param f: File-like or string object.
"""
from bzrlib.atomicfile import AtomicFile
try:
path = self.abspath(relpath)
fp = AtomicFile(path, 'wb')
except IOError, e:
if e.errno == errno.ENOENT:
raise NoSuchFile('File %r does not exist' % path, orig_error=e)
raise LocalTransportError(orig_error=e)
try:
self._pump(f, fp)
fp.commit()
finally:
fp.close()
def mkdir(self, relpath):
"""Create a directory at the given path."""
try:
os.mkdir(self.abspath(relpath))
except OSError,e:
if e.errno == errno.EEXIST:
raise FileExists(orig_error=e)
elif e.errno == errno.ENOENT:
raise NoSuchFile(orig_error=e)
raise LocalTransportError(orig_error=e)
def append(self, relpath, f):
"""Append the text in the file-like object into the final
location.
"""
fp = open(self.abspath(relpath), 'ab')
self._pump(f, fp)
def copy(self, rel_from, rel_to):
"""Copy the item at rel_from to the location at rel_to"""
import shutil
path_from = self.abspath(rel_from)
path_to = self.abspath(rel_to)
try:
shutil.copy(path_from, path_to)
except OSError,e:
raise LocalTransportError(orig_error=e)
def move(self, rel_from, rel_to):
"""Move the item at rel_from to the location at rel_to"""
path_from = self.abspath(rel_from)
path_to = self.abspath(rel_to)
try:
os.rename(path_from, path_to)
except OSError,e:
raise LocalTransportError(orig_error=e)
def delete(self, relpath):
"""Delete the item at relpath"""
try:
os.remove(self.abspath(relpath))
except OSError,e:
raise LocalTransportError(orig_error=e)
def copy_to(self, relpaths, other, pb=None):
"""Copy a set of entries from self into another Transport.
:param relpaths: A list/generator of entries to be copied.
"""
if isinstance(other, LocalTransport):
# Both from & to are on the local filesystem
# Unfortunately, I can't think of anything faster than just
# copying them across, one by one :(
import shutil
total = self._get_total(relpaths)
count = 0
for path in relpaths:
self._update_pb(pb, 'copy-to', count, total)
shutil.copy(self.abspath(path), other.abspath(path))
count += 1
return count
else:
return super(LocalTransport, self).copy_to(relpaths, other, pb=pb)
def list_dir(self, relpath):
"""Return a list of all files at the given location.
WARNING: many transports do not support this, so trying avoid using
it if at all possible.
"""
try:
return os.listdir(self.abspath(relpath))
except OSError,e:
raise LocalTransportError(orig_error=e)
def stat(self, relpath):
"""Return the stat information for a file.
"""
try:
return os.stat(self.abspath(relpath))
except OSError,e:
raise LocalTransportError(orig_error=e)
def lock_read(self, relpath):
"""Lock the given file for shared (read) access.
:return: A lock object, which should be passed to Transport.unlock()
"""
from bzrlib.lock import ReadLock
return ReadLock(self.abspath(relpath))
def lock_write(self, relpath):
"""Lock the given file for exclusive (write) access.
WARNING: many transports do not support this, so trying avoid using it
:return: A lock object, which should be passed to Transport.unlock()
"""
from bzrlib.lock import WriteLock
return WriteLock(self.abspath(relpath))
# If nothing else matches, try the LocalTransport
register_transport(None, LocalTransport)
register_transport('file://', LocalTransport)
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