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# (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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