charm-neutron-openvswitch/hooks/charmhelpers/core/files.py
James Page 76f4183dff Resync charmhelpers for licensing change
The charm-helpers project have re-licensed to Apache 2.0
inline with the agreed licensing approach to intefaces,
layers and charms generally.

Resync helpers to bring charmhelpers inline with charm
codebase.

Change-Id: I1b988a174d4a236599cffef8334a2923bf031fff
2016-07-06 16:38:31 +01:00

44 lines
1.6 KiB
Python

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2014-2015 Canonical Limited.
#
# 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.
__author__ = 'Jorge Niedbalski <niedbalski@ubuntu.com>'
import os
import subprocess
def sed(filename, before, after, flags='g'):
"""
Search and replaces the given pattern on filename.
:param filename: relative or absolute file path.
:param before: expression to be replaced (see 'man sed')
:param after: expression to replace with (see 'man sed')
:param flags: sed-compatible regex flags in example, to make
the search and replace case insensitive, specify ``flags="i"``.
The ``g`` flag is always specified regardless, so you do not
need to remember to include it when overriding this parameter.
:returns: If the sed command exit code was zero then return,
otherwise raise CalledProcessError.
"""
expression = r's/{0}/{1}/{2}'.format(before,
after, flags)
return subprocess.check_call(["sed", "-i", "-r", "-e",
expression,
os.path.expanduser(filename)])