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# Microsoft Azure Linux Agent
#
# Copyright 2014 Microsoft Corporation
#
# 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.
#
# Requires Python 2.4+ and Openssl 1.0+
#
"""
File operation util functions
"""
import os
import re
import shutil
import pwd
import tempfile
import azurelinuxagent.common.logger as logger
from azurelinuxagent.common.future import ustr
import azurelinuxagent.common.utils.textutil as textutil
def copy_file(from_path, to_path=None, to_dir=None):
if to_path is None:
to_path = os.path.join(to_dir, os.path.basename(from_path))
shutil.copyfile(from_path, to_path)
return to_path
def read_file(filepath, asbin=False, remove_bom=False, encoding='utf-8'):
"""
Read and return contents of 'filepath'.
"""
mode = 'rb'
with open(filepath, mode) as in_file:
data = in_file.read()
if data is None:
return None
if asbin:
return data
if remove_bom:
#Remove bom on bytes data before it is converted into string.
data = textutil.remove_bom(data)
data = ustr(data, encoding=encoding)
return data
def write_file(filepath, contents, asbin=False, encoding='utf-8', append=False):
"""
Write 'contents' to 'filepath'.
"""
mode = "ab" if append else "wb"
data = contents
if not asbin:
data = contents.encode(encoding)
with open(filepath, mode) as out_file:
out_file.write(data)
def append_file(filepath, contents, asbin=False, encoding='utf-8'):
"""
Append 'contents' to 'filepath'.
"""
write_file(filepath, contents, asbin=asbin, encoding=encoding, append=True)
def base_name(path):
head, tail = os.path.split(path)
return tail
def get_line_startingwith(prefix, filepath):
"""
Return line from 'filepath' if the line startswith 'prefix'
"""
for line in read_file(filepath).split('\n'):
if line.startswith(prefix):
return line
return None
#End File operation util functions
def mkdir(dirpath, mode=None, owner=None):
if not os.path.isdir(dirpath):
os.makedirs(dirpath)
if mode is not None:
chmod(dirpath, mode)
if owner is not None:
chowner(dirpath, owner)
def chowner(path, owner):
if not os.path.exists(path):
logger.error("Path does not exist: {0}".format(path))
else:
owner_info = pwd.getpwnam(owner)
os.chown(path, owner_info[2], owner_info[3])
def chmod(path, mode):
if not os.path.exists(path):
logger.error("Path does not exist: {0}".format(path))
else:
os.chmod(path, mode)
def rm_files(*args):
for path in args:
if os.path.isfile(path):
os.remove(path)
def rm_dirs(*args):
"""
Remove all the contents under the directry
"""
for dir_name in args:
if os.path.isdir(dir_name):
for item in os.listdir(dir_name):
path = os.path.join(dir_name, item)
if os.path.isfile(path):
os.remove(path)
elif os.path.isdir(path):
shutil.rmtree(path)
def trim_ext(path, ext):
if not ext.startswith("."):
ext = "." + ext
return path.split(ext)[0] if path.endswith(ext) else path
def update_conf_file(path, line_start, val, chk_err=False):
conf = []
if not os.path.isfile(path) and chk_err:
raise IOError("Can't find config file:{0}".format(path))
conf = read_file(path).split('\n')
conf = [x for x in conf if not x.startswith(line_start)]
conf.append(val)
write_file(path, '\n'.join(conf))
def search_file(target_dir_name, target_file_name):
for root, dirs, files in os.walk(target_dir_name):
for file_name in files:
if file_name == target_file_name:
return os.path.join(root, file_name)
return None
def chmod_tree(path, mode):
for root, dirs, files in os.walk(path):
for file_name in files:
os.chmod(os.path.join(root, file_name), mode)
def findstr_in_file(file_path, pattern_str):
"""
Return match object if found in file.
"""
try:
pattern = re.compile(pattern_str)
for line in (open(file_path, 'r')).readlines():
match = re.search(pattern, line)
if match:
return match
except:
raise
return None
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