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Mini Shell
# -*- coding: utf-8 -*-
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2018 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
#
import os
import sys
import subprocess
class ExternalProgramFailed(Exception):
"""Exception class for errors related to externally executed commands."""
def __init__(self, message: str = ""):
Exception.__init__(self, message)
def check_command(cmdname):
"""
Checks if command is present and exits if no
"""
if not os.path.exists(cmdname):
print(f"Command not found: ({cmdname})")
sys.exit(1)
def run_command(cmd, env_data=None, return_full_output=False, std_in=None, convert_to_str=True):
"""
Runs external process and returns output
:param cmd: command and arguments as a list
:param env_data: environment data for process
:param return_full_output: if true, returns (ret_code, std_out, std_err)
@return: process stdout if is_full_output==False
else - cortege (ret_code, std_out, std_err) without any checking
"""
cmd_line = " ".join(cmd)
try:
std_err_obj = subprocess.PIPE if return_full_output else subprocess.STDOUT
stdin_arg = subprocess.PIPE if std_in else subprocess.DEVNULL
with subprocess.Popen(
cmd,
stdin=stdin_arg,
stdout=subprocess.PIPE,
stderr=std_err_obj,
close_fds=True,
env=env_data,
text=convert_to_str,
) as proc:
if not std_in:
std_out, std_err = proc.communicate()
else:
std_out, std_err = proc.communicate(std_in)
returncode = proc.returncode
except OSError as oserr:
raise ExternalProgramFailed(
f"{cmd_line}. Cannot run command: {str(oserr)}"
) from oserr
if return_full_output:
return returncode, std_out, std_err
if returncode != 0:
if not convert_to_str:
raise ExternalProgramFailed(f"Error during command execution: {cmd_line}")
else:
raise ExternalProgramFailed(
std_err or f"output of the command: {cmd_line}\n{std_out}"
)
return std_out
def exec_utility(util_path, params):
"""
Executes supplied utility with supplied parameters
:param util_path: Executable file to run path
:param params: utility parameters
:return: Cortege (ret_code, utility_stdout)
"""
args = []
args.append(util_path)
args.extend(params)
with subprocess.Popen(args, stdout=subprocess.PIPE, text=True) as proc:
stdout, _ = proc.communicate()
retcode = proc.returncode
return retcode, stdout.strip()
Zerion Mini Shell 1.0