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Directory :  /proc/2/task/2/cwd/lib/python3/dist-packages/ansible/utils/

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Current File : /proc/2/task/2/cwd/lib/python3/dist-packages/ansible/utils//ssh_functions.py
# (c) 2016, James Tanner
# (c) 2016, Toshio Kuratomi <tkuratomi@ansible.com>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.

# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import subprocess

from ansible import constants as C
from ansible.module_utils._text import to_bytes
from ansible.module_utils.compat.paramiko import paramiko


_HAS_CONTROLPERSIST = {}  # type: dict[str, bool]


def check_for_controlpersist(ssh_executable):
    try:
        # If we've already checked this executable
        return _HAS_CONTROLPERSIST[ssh_executable]
    except KeyError:
        pass

    b_ssh_exec = to_bytes(ssh_executable, errors='surrogate_or_strict')
    has_cp = True
    try:
        cmd = subprocess.Popen([b_ssh_exec, '-o', 'ControlPersist'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        (out, err) = cmd.communicate()
        if b"Bad configuration option" in err or b"Usage:" in err:
            has_cp = False
    except OSError:
        has_cp = False

    _HAS_CONTROLPERSIST[ssh_executable] = has_cp
    return has_cp


# TODO: move to 'smart' connection plugin that subclasses to ssh/paramiko as needed.
def set_default_transport():

    # deal with 'smart' connection .. one time ..
    if C.DEFAULT_TRANSPORT == 'smart':
        # TODO: check if we can deprecate this as ssh w/o control persist should
        # not be as common anymore.

        # see if SSH can support ControlPersist if not use paramiko
        if not check_for_controlpersist('ssh') and paramiko is not None:
            C.DEFAULT_TRANSPORT = "paramiko"
        else:
            C.DEFAULT_TRANSPORT = "ssh"

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