~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005, 2006 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

"""Transport for the local filesystem.

This is a fairly thin wrapper on regular file IO.

"""

import os

from stat import ST_MODE, S_ISDIR, ST_SIZE, S_IMODE

import sys

from bzrlib.lazy_import import lazy_import

lazy_import(globals(), """

import errno

import shutil

from bzrlib import (

    atomicfile,

    osutils,

    urlutils,

    symbol_versioning,

    )

from bzrlib.trace import mutter

from bzrlib.transport import LateReadError

""")

from bzrlib.transport import Transport, Server

_append_flags = os.O_CREAT | os.O_APPEND | os.O_WRONLY | osutils.O_BINARY

_put_non_atomic_flags = os.O_CREAT | os.O_TRUNC | os.O_WRONLY | osutils.O_BINARY

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 not base.startswith('file://'):

            symbol_versioning.warn(

                "Instantiating LocalTransport with a filesystem path"

                " is deprecated as of bzr 0.8."

                " Please use bzrlib.transport.get_transport()"

                " or pass in a file:// url.",

                 DeprecationWarning,

                 stacklevel=2

                 )

            base = urlutils.local_path_to_url(base)

        if base[-1] != '/':

            base = base + '/'

        super(LocalTransport, self).__init__(base)

        self._local_base = urlutils.local_path_from_url(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:

            abspath = self.abspath(offset)

            if abspath == 'file://':

                # fix upwalk for UNC path

                # when clone from //HOST/path updir recursively

                # we should stop at least at //HOST part

                abspath = self.base

            return LocalTransport(abspath)

    def _abspath(self, relative_reference):

        """Return a path for use in os calls.

        Several assumptions are made:

         - relative_reference does not contain '..'

         - relative_reference is url escaped.

        """

        if relative_reference in ('.', ''):

            return self._local_base

        return self._local_base + urlutils.unescape(relative_reference)

    def abspath(self, relpath):

        """Return the full url to the given relative URL."""

        # TODO: url escape the result. RBC 20060523.

        assert isinstance(relpath, basestring), (type(relpath), relpath)

        # jam 20060426 Using normpath on the real path, because that ensures

        #       proper handling of stuff like

        path = osutils.normpath(osutils.pathjoin(

                    self._local_base, urlutils.unescape(relpath)))

        return urlutils.local_path_to_url(path)

    def local_abspath(self, relpath):

        """Transform the given relative path URL into the actual path on disk

        This function only exists for the LocalTransport, since it is

        the only one that has direct local access.

        This is mostly for stuff like WorkingTree which needs to know

        the local working directory.

        This function is quite expensive: it calls realpath which resolves

        symlinks.

        """

        absurl = self.abspath(relpath)

        # mutter(u'relpath %s => base: %s, absurl %s', relpath, self.base, absurl)

        return urlutils.local_path_from_url(absurl)

    def relpath(self, abspath):

        """Return the local path portion from a given absolute path.

        """

        if abspath is None:

            abspath = u'.'

        return urlutils.file_relpath(

            urlutils.strip_trailing_slash(self.base), 

            urlutils.strip_trailing_slash(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, OSError),e:

            if e.errno == errno.EISDIR:

                return LateReadError(relpath)

            self._translate_error(e, path)

    def put_file(self, relpath, f, mode=None):

        """Copy the file-like object into the location.

        :param relpath: Location to put the contents, relative to base.

        :param f:       File-like object.

        :param mode: The mode for the newly created file, 

                     None means just use the default

        """

        path = relpath

        try:

            path = self._abspath(relpath)

            osutils.check_legal_path(path)

            fp = atomicfile.AtomicFile(path, 'wb', new_mode=mode)

        except (IOError, OSError),e:

            self._translate_error(e, path)

        try:

            self._pump(f, fp)

            fp.commit()

        finally:

            fp.close()

    def put_bytes(self, relpath, bytes, mode=None):

        """Copy the string into the location.

        :param relpath: Location to put the contents, relative to base.

        :param bytes:   String

        """

        path = relpath

        try:

            path = self._abspath(relpath)

            osutils.check_legal_path(path)

            fp = atomicfile.AtomicFile(path, 'wb', new_mode=mode)

        except (IOError, OSError),e:

            self._translate_error(e, path)

        try:

            fp.write(bytes)

            fp.commit()

        finally:

            fp.close()

    def _put_non_atomic_helper(self, relpath, writer,

                               mode=None,

                               create_parent_dir=False,

                               dir_mode=None):

        """Common functionality information for the put_*_non_atomic.

        This tracks all the create_parent_dir stuff.

        :param relpath: the path we are putting to.

        :param writer: A function that takes an os level file descriptor

            and writes whatever data it needs to write there.

        :param mode: The final file mode.

        :param create_parent_dir: Should we be creating the parent directory

            if it doesn't exist?

        """

        abspath = self._abspath(relpath)

        if mode is None:

            # os.open() will automatically use the umask

            local_mode = 0666

        else:

            local_mode = mode

        try:

            fd = os.open(abspath, _put_non_atomic_flags, local_mode)

        except (IOError, OSError),e:

            # We couldn't create the file, maybe we need to create

            # the parent directory, and try again

            if (not create_parent_dir

                or e.errno not in (errno.ENOENT,errno.ENOTDIR)):

                self._translate_error(e, relpath)

            parent_dir = os.path.dirname(abspath)

            if not parent_dir:

                self._translate_error(e, relpath)

            self._mkdir(parent_dir, mode=dir_mode)

            # We created the parent directory, lets try to open the

            # file again

            try:

                fd = os.open(abspath, _put_non_atomic_flags, local_mode)

            except (IOError, OSError), e:

                self._translate_error(e, relpath)

        try:

            st = os.fstat(fd)

            if mode is not None and mode != S_IMODE(st.st_mode):

                # Because of umask, we may still need to chmod the file.

                # But in the general case, we won't have to

                os.chmod(abspath, mode)

            writer(fd)

        finally:

            os.close(fd)

    def put_file_non_atomic(self, relpath, f, mode=None,

                            create_parent_dir=False,

                            dir_mode=None):

        """Copy the file-like object into the target location.

        This function is not strictly safe to use. It is only meant to

        be used when you already know that the target does not exist.

        It is not safe, because it will open and truncate the remote

        file. So there may be a time when the file has invalid contents.

        :param relpath: The remote location to put the contents.

        :param f:       File-like object.

        :param mode:    Possible access permissions for new file.

                        None means do not set remote permissions.

        :param create_parent_dir: If we cannot create the target file because

                        the parent directory does not exist, go ahead and

                        create it, and then try again.

        """

        def writer(fd):

            self._pump_to_fd(f, fd)

        self._put_non_atomic_helper(relpath, writer, mode=mode,

                                    create_parent_dir=create_parent_dir,

                                    dir_mode=dir_mode)

    def put_bytes_non_atomic(self, relpath, bytes, mode=None,

                             create_parent_dir=False, dir_mode=None):

        def writer(fd):

            os.write(fd, bytes)

        self._put_non_atomic_helper(relpath, writer, mode=mode,

                                    create_parent_dir=create_parent_dir,

                                    dir_mode=dir_mode)

    def iter_files_recursive(self):

        """Iter the relative paths of files in the transports sub-tree."""

        queue = list(self.list_dir(u'.'))

        while queue:

            relpath = queue.pop(0)

            st = self.stat(relpath)

            if S_ISDIR(st[ST_MODE]):

                for i, basename in enumerate(self.list_dir(relpath)):

                    queue.insert(i, relpath+'/'+basename)

            else:

                yield relpath

    def _mkdir(self, abspath, mode=None):

        """Create a real directory, filtering through mode"""

        if mode is None:

            # os.mkdir() will filter through umask

            local_mode = 0777

        else:

            local_mode = mode

        try:

            os.mkdir(abspath, local_mode)

            if mode is not None:

                # It is probably faster to just do the chmod, rather than

                # doing a stat, and then trying to compare

                os.chmod(abspath, mode)

        except (IOError, OSError),e:

            self._translate_error(e, abspath)

    def mkdir(self, relpath, mode=None):

        """Create a directory at the given path."""

        self._mkdir(self._abspath(relpath), mode=mode)

    def _get_append_file(self, relpath, mode=None):

        """Call os.open() for the given relpath"""

        file_abspath = self._abspath(relpath)

        if mode is None:

            # os.open() will automatically use the umask

            local_mode = 0666

        else:

            local_mode = mode

        try:

            return file_abspath, os.open(file_abspath, _append_flags, local_mode)

        except (IOError, OSError),e:

            self._translate_error(e, relpath)

    def _check_mode_and_size(self, file_abspath, fd, mode=None):

        """Check the mode of the file, and return the current size"""

        st = os.fstat(fd)

        if mode is not None and mode != S_IMODE(st.st_mode):

            # Because of umask, we may still need to chmod the file.

            # But in the general case, we won't have to

            os.chmod(file_abspath, mode)

        return st.st_size

    def append_file(self, relpath, f, mode=None):

        """Append the text in the file-like object into the final location."""

        file_abspath, fd = self._get_append_file(relpath, mode=mode)

        try:

            result = self._check_mode_and_size(file_abspath, fd, mode=mode)

            self._pump_to_fd(f, fd)

        finally:

            os.close(fd)

        return result

    def append_bytes(self, relpath, bytes, mode=None):

        """Append the text in the string into the final location."""

        file_abspath, fd = self._get_append_file(relpath, mode=mode)

        try:

            result = self._check_mode_and_size(file_abspath, fd, mode=mode)

            os.write(fd, bytes)

        finally:

            os.close(fd)

        return result

    def _pump_to_fd(self, fromfile, to_fd):

        """Copy contents of one file to another."""

        BUFSIZE = 32768

        while True:

            b = fromfile.read(BUFSIZE)

            if not b:

                break

            os.write(to_fd, b)

    def copy(self, rel_from, rel_to):

        """Copy the item at rel_from to the location at rel_to"""

        path_from = self._abspath(rel_from)

        path_to = self._abspath(rel_to)

        try:

            shutil.copy(path_from, path_to)

        except (IOError, OSError),e:

            # TODO: What about path_to?

            self._translate_error(e, path_from)

    def rename(self, rel_from, rel_to):

        path_from = self._abspath(rel_from)

        try:

            # *don't* call bzrlib.osutils.rename, because we want to 

            # detect errors on rename

            os.rename(path_from, self._abspath(rel_to))

        except (IOError, OSError),e:

            # TODO: What about path_to?

            self._translate_error(e, path_from)

    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:

            # this version will delete the destination if necessary

            osutils.rename(path_from, path_to)

        except (IOError, OSError),e:

            # TODO: What about path_to?

            self._translate_error(e, path_from)

    def delete(self, relpath):

        """Delete the item at relpath"""

        path = relpath

        try:

            path = self._abspath(relpath)

            os.remove(path)

        except (IOError, OSError),e:

            self._translate_error(e, path)

    def external_url(self):

        """See bzrlib.transport.Transport.external_url."""

        # File URL's are externally usable.

        return self.base

    def copy_to(self, relpaths, other, mode=None, 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 :(

            total = self._get_total(relpaths)

            count = 0

            for path in relpaths:

                self._update_pb(pb, 'copy-to', count, total)

                try:

                    mypath = self._abspath(path)

                    otherpath = other._abspath(path)

                    shutil.copy(mypath, otherpath)

                    if mode is not None:

                        os.chmod(otherpath, mode)

                except (IOError, OSError),e:

                    self._translate_error(e, path)

                count += 1

            return count

        else:

            return super(LocalTransport, self).copy_to(relpaths, other, mode=mode, pb=pb)

    def listable(self):

        """See Transport.listable."""

        return True

    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.

        """

        path = self._abspath(relpath)

        try:

            entries = os.listdir(path)

        except (IOError, OSError), e:

            self._translate_error(e, path)

        return [urlutils.escape(entry) for entry in entries]

    def stat(self, relpath):

        """Return the stat information for a file.

        """

        path = relpath

        try:

            path = self._abspath(relpath)

            return os.stat(path)

        except (IOError, OSError),e:

            self._translate_error(e, path)

    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

        path = relpath

        try:

            path = self._abspath(relpath)

            return ReadLock(path)

        except (IOError, OSError), e:

            self._translate_error(e, path)

    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))

    def rmdir(self, relpath):

        """See Transport.rmdir."""

        path = relpath

        try:

            path = self._abspath(relpath)

            os.rmdir(path)

        except (IOError, OSError),e:

            self._translate_error(e, path)

    def _can_roundtrip_unix_modebits(self):

        if sys.platform == 'win32':

            # anyone else?

            return False

        else:

            return True

class EmulatedWin32LocalTransport(LocalTransport):

    """Special transport for testing Win32 [UNC] paths on non-windows"""

    def __init__(self, base):

        if base[-1] != '/':

            base = base + '/'

        super(LocalTransport, self).__init__(base)

        self._local_base = urlutils._win32_local_path_from_url(base)

    def abspath(self, relpath):

        assert isinstance(relpath, basestring), (type(relpath), relpath)

        path = osutils.normpath(osutils.pathjoin(

                    self._local_base, urlutils.unescape(relpath)))

        return urlutils._win32_local_path_to_url(path)

    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 EmulatedWin32LocalTransport(self.base)

        else:

            abspath = self.abspath(offset)

            if abspath == 'file://':

                # fix upwalk for UNC path

                # when clone from //HOST/path updir recursively

                # we should stop at least at //HOST part

                abspath = self.base

            return EmulatedWin32LocalTransport(abspath)

class LocalURLServer(Server):

    """A pretend server for local transports, using file:// urls.

    Of course no actual server is required to access the local filesystem, so

    this just exists to tell the test code how to get to it.

    """

    def setUp(self):

        """Setup the server to service requests.

        :param decorated_transport: ignored by this implementation.

        """

    def get_url(self):

        """See Transport.Server.get_url."""

        return urlutils.local_path_to_url('')

def get_test_permutations():

    """Return the permutations to be used in testing."""

    return [

            (LocalTransport, LocalURLServer),

            ]