~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

import shutil

import sys

from stat import ST_MODE, S_ISDIR, ST_SIZE, S_IMODE

import tempfile

from bzrlib import (

    osutils,

    urlutils,

    )

from bzrlib.osutils import (abspath, realpath, normpath, pathjoin, rename,

                            check_legal_path, rmtree)

from bzrlib.symbol_versioning import warn

from bzrlib.trace import mutter

from bzrlib.transport import Transport, Server

_append_flags = os.O_CREAT | os.O_APPEND | 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://'):

            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)

        self._get_default_modes()

    def _get_default_modes(self):

        """Figure out what the default file and directory modes are"""

        umask = osutils.get_umask()

        self._default_file_mode = 0666 & ~umask

        self._default_dir_mode = 0777 & ~umask

    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, 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 = normpath(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:

            self._translate_error(e, path)

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

        """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

        if mode is None:

            mode = self._default_file_mode

        path = relpath

        try:

            path = self._abspath(relpath)

            check_legal_path(path)

            fp = 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 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, relpath, mode=None):

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

        path = relpath

        try:

            if mode is None:

                local_mode = self._default_dir_mode

            else:

                local_mode = mode

            path = self._abspath(relpath)

            os.mkdir(path, 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(path, mode)

        except (IOError, OSError),e:

            self._translate_error(e, path)

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

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

        abspath = self._abspath(relpath)

        if mode is None:

            local_mode = self._default_file_mode

        else:

            local_mode = mode

        try:

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

        except (IOError, OSError),e:

            self._translate_error(e, relpath)

        try:

            st = os.fstat(fd)

            result = st.st_size

            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)

            # TODO: make a raw FD version of _pump ?

            self._pump_to_fd(f, fd)

        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

            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 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:

            return [urlutils.escape(entry) for entry in os.listdir(path)]

        except (IOError, OSError), e:

            self._translate_error(e, path)

    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 LocalRelpathServer(Server):

    """A pretend server for local transports, using relpaths."""

    def get_url(self):

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

        return "."

class LocalAbspathServer(Server):

    """A pretend server for local transports, using absolute paths."""

    def get_url(self):

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

        return os.path.abspath("")

class LocalURLServer(Server):

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

    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, LocalRelpathServer),

            (LocalTransport, LocalAbspathServer),

            (LocalTransport, LocalURLServer),

            ]