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# Copyright (c) 2010, 2011 Nicira Networks
#
# 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.
import os
import os.path
import sys
PROGRAM_NAME = os.path.basename(sys.argv[0])
def abs_file_name(dir_, file_name):
"""If 'file_name' starts with '/', returns a copy of 'file_name'.
Otherwise, returns an absolute path to 'file_name' considering it relative
to 'dir_', which itself must be absolute. 'dir_' may be None or the empty
string, in which case the current working directory is used.
Returns None if 'dir_' is None and getcwd() fails.
This differs from os.path.abspath() in that it will never change the
meaning of a file name."""
if file_name.startswith('/'):
return file_name
else:
if dir_ is None or dir_ == "":
try:
dir_ = os.getcwd()
except OSError:
return None
if dir_.endswith('/'):
return dir_ + file_name
else:
return "%s/%s" % (dir_, file_name)
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