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#
# Various functions
#
# Copyright (c) 2015 Red Hat, Inc.
# Author: Nikolai Kondrashov <Nikolai.Kondrashov@redhat.com>
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
#
import re
import os
import sys
import subprocess
import config
import shutil
UNINDENT_RE = re.compile("^ +", re.MULTILINE)
def unindent(text):
"""
Unindent text by removing at most the number of spaces present in
the first non-empty line from the beginning of every line.
"""
indent_ref = [0]
def replace(match):
if indent_ref[0] == 0:
indent_ref[0] = len(match.group())
return match.group()[indent_ref[0]:]
return UNINDENT_RE.sub(replace, text)
def run_shell():
"""
Execute an interactive shell under "screen", preserving environment.
For use as a breakpoint for debugging.
"""
my_env = os.environ.copy()
my_env["ROOT_DIR"] = config.PREFIX
# screen filter out LD_* evniroment varibles.
# Back-up them and set them later in screenrc
my_env["_LD_LIBRARY_PATH"] = os.getenv("LD_LIBRARY_PATH", "")
my_env["_LD_PRELOAD"] = os.getenv("LD_PRELOAD", "")
subprocess.call([
"screen", "-DAm", "-S", "sssd_cwrap_session", "-c",
".config/screenrc"],
env=my_env
)
def first_dir(*args):
"""Return first argument that points to an existing directory."""
for arg in args:
if os.path.isdir(arg):
return arg
def backup_envvar_file(name):
path = os.environ[name]
backup_path = path + ".bak"
shutil.copyfile(path, backup_path)
return path
def restore_envvar_file(name):
path = os.environ[name]
backup_path = path + ".bak"
os.rename(backup_path, path)
def get_call_output(cmd, stderr_output=subprocess.PIPE, check=False):
"""
Executes the provided command.
When check is set to True, this function will throw an exception
if the command returns with a non-zero value.
"""
if (sys.version_info.major < 3
or (sys.version_info.major == 3 and sys.version_info.minor < 7)):
try:
output = subprocess.check_output(cmd, universal_newlines=True,
stderr=stderr_output)
except subprocess.CalledProcessError as err:
if (not check):
output = err.output
else:
raise err
return output
process = subprocess.run(cmd, check=check, text=True,
stdout=subprocess.PIPE, stderr=stderr_output)
return process.stdout
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