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# Copyright (C) 2005-2011 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
"""Export a bzrlib.tree.Tree to a new or empty directory."""
from __future__ import absolute_import
import errno
import os
from bzrlib import errors, osutils
from bzrlib.export import _export_iter_entries
def dir_exporter_generator(tree, dest, root, subdir=None,
force_mtime=None, fileobj=None):
"""Return a generator that exports this tree to a new directory.
`dest` should either not exist or should be empty. If it does not exist it
will be created holding the contents of this tree.
:param fileobj: Is not used in this exporter
:note: If the export fails, the destination directory will be
left in an incompletely exported state: export is not transactional.
"""
try:
os.mkdir(dest)
except OSError, e:
if e.errno == errno.EEXIST:
# check if directory empty
if os.listdir(dest) != []:
raise errors.BzrError(
"Can't export tree to non-empty directory.")
else:
raise
# Iterate everything, building up the files we will want to export, and
# creating the directories and symlinks that we need.
# This tracks (file_id, (destination_path, executable))
# This matches the api that tree.iter_files_bytes() wants
# Note in the case of revision trees, this does trigger a double inventory
# lookup, hopefully it isn't too expensive.
to_fetch = []
for dp, tp, ie in _export_iter_entries(tree, subdir):
fullpath = osutils.pathjoin(dest, dp)
if ie.kind == "file":
to_fetch.append((ie.file_id, (dp, tp, ie.file_id)))
elif ie.kind == "directory":
os.mkdir(fullpath)
elif ie.kind == "symlink":
try:
symlink_target = tree.get_symlink_target(ie.file_id, tp)
os.symlink(symlink_target, fullpath)
except OSError, e:
raise errors.BzrError(
"Failed to create symlink %r -> %r, error: %s"
% (fullpath, symlink_target, e))
else:
raise errors.BzrError("don't know how to export {%s} of kind %r" %
(ie.file_id, ie.kind))
yield
# The data returned here can be in any order, but we've already created all
# the directories
flags = os.O_CREAT | os.O_TRUNC | os.O_WRONLY | getattr(os, 'O_BINARY', 0)
for (relpath, treepath, file_id), chunks in tree.iter_files_bytes(to_fetch):
fullpath = osutils.pathjoin(dest, relpath)
# We set the mode and let the umask sort out the file info
mode = 0666
if tree.is_executable(file_id, treepath):
mode = 0777
out = os.fdopen(os.open(fullpath, flags, mode), 'wb')
try:
out.writelines(chunks)
finally:
out.close()
if force_mtime is not None:
mtime = force_mtime
else:
mtime = tree.get_file_mtime(file_id, treepath)
os.utime(fullpath, (mtime, mtime))
yield
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