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# Copyright 2013 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Exclude file specification."""
import logging
import os
class ExcludeSpec(object):
"""Specifies how exclusion of a path should be handled."""
def __init__(self, path, preserve_file=False, preserve_dir=False,
preserve_subdir=False):
self.path = path
self.preserve_dir = preserve_dir
self.preserve_file = False
self.preserve_subdir = False
# Preserve files and subdirs only if dir is preserved.
if preserve_file and preserve_dir:
self.preserve_file = True
if preserve_subdir and preserve_dir:
self.preserve_subdir = True
def ShouldExclude(self, filename):
prefix = os.path.commonprefix([filename, self.path])
if prefix == self.path:
if ((self.preserve_dir and filename == self.path) or
(self.preserve_subdir and os.path.isdir(filename)) or
(self.preserve_file and os.path.isfile(filename))):
logging.warning('preserving %s', filename)
return False
return True
return False
def GetSpec(self):
return '(%s, %d:%d:%d)' % (self.path, self.preserve_file, self.preserve_dir,
self.preserve_subdir)
def GetRsyncSpec(self, src):
"""Returns exclude spec in a format required by rsync.
Args:
src: source directory path passed to rsync. rsync expects exclude-spec to
be relative to src directory.
Returns:
A string of exclude filters in rsync exclude-from file format.
"""
spec = ''
prefix = os.path.commonprefix([src, self.path])
if prefix == src:
relative_path = os.path.join('/', self.path[len(prefix):])
if self.preserve_dir:
spec += '+ %s\n' % relative_path
if self.preserve_file or self.preserve_subdir:
if os.path.isdir(self.path):
for f in os.listdir(self.path):
file_path = os.path.join(self.path, f)
relative_file_path = os.path.join(relative_path, f)
if self.preserve_file and os.path.isfile(file_path):
spec += '+ %s\n' % relative_file_path
if self.preserve_subdir and os.path.isdir(file_path):
spec += '+ %s\n' % relative_file_path
else:
spec += '- %s\n' % relative_path
spec += '- %s\n' % os.path.join(relative_path, '**')
return spec
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