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lxc_ssh.py
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# Copyright 2016 Pierre Chifflier <pollux@wzdftpd.net>
# SPDX-License-Identifier: GPL-3.0-or-later
#
# SSH + lxc-attach connection module for Ansible 2.0
#
# Adapted from ansible/plugins/connection/ssh.py
# Forked from https://github.com/chifflier/ansible-lxc-ssh
# Hosted on https://github.com/andreasscherbaum/ansible-lxc-ssh
#
# 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/>.
from __future__ import absolute_import, division, print_function
__metaclass__ = type
import errno
import fcntl
import hashlib
import os
import pipes
import pty
import shlex
import subprocess
import sys
import time
from ansible.release import __version__ as ansible_version
from functools import wraps
from ansible import constants as C
from ansible.errors import (
AnsibleError,
AnsibleConnectionFailure,
AnsibleFileNotFound,
)
from ansible.errors import AnsibleOptionsError
from ansible.compat import selectors
from ansible.module_utils.six import PY3, text_type, binary_type
from ansible.module_utils.six.moves import shlex_quote
from ansible.module_utils._text import to_bytes, to_native, to_text
from ansible.module_utils.parsing.convert_bool import BOOLEANS, boolean
from ansible.plugins.connection import ConnectionBase, BUFSIZE
from ansible.utils.path import unfrackpath, makedirs_safe
from ansible.module_utils._text import (
to_bytes,
to_text as to_unicode,
to_native as to_str,
)
DOCUMENTATION = """
name: lxc_ssh
short_description: connect via ssh and lxc to remote lxc guest
description:
- This connection plugin allows ansible to communicate to the target
machines via normal ssh and lxc cli.
- Ansible does not expose a channel to allow communication between the
user and the ssh process to accept a password manually to decrypt an
ssh key when using this connection plugin (which is the default). The
use of ``ssh-agent`` is highly recommended.
author: Pierre Chifflier
notes:
- Many options default to 'None' here but that only means we don't
override the ssh tool's defaults and/or configuration.
For example, if you specify the port in this plugin it will override
any C(Port) entry in your C(.ssh/config).
options:
host:
description: Hostname/ip to connect to.
vars:
- name: inventory_hostname
- name: ansible_host
- name: ansible_ssh_host
- name: delegated_vars['ansible_host']
- name: delegated_vars['ansible_ssh_host']
host_key_checking:
description: Determines if ssh should check host keys
type: boolean
ini:
- section: defaults
key: 'host_key_checking'
- section: ssh_connection
key: 'host_key_checking'
version_added: '2.5'
env:
- name: ANSIBLE_HOST_KEY_CHECKING
- name: ANSIBLE_SSH_HOST_KEY_CHECKING
version_added: '2.5'
vars:
- name: ansible_host_key_checking
version_added: '2.5'
- name: ansible_ssh_host_key_checking
version_added: '2.5'
password:
description: Authentication password for the C(remote_user).
Can be supplied as CLI option.
vars:
- name: ansible_password
- name: ansible_ssh_pass
- name: ansible_ssh_password
sshpass_prompt:
description: Password prompt that sshpass should search for.
Supported by sshpass 1.06 and up.
default: ''
ini:
- section: 'ssh_connection'
key: 'sshpass_prompt'
env:
- name: ANSIBLE_SSHPASS_PROMPT
vars:
- name: ansible_sshpass_prompt
version_added: '2.10'
ssh_args:
description: Arguments to pass to all ssh cli tools
default: '-C -o ControlMaster=auto -o ControlPersist=60s'
ini:
- section: 'ssh_connection'
key: 'ssh_args'
env:
- name: ANSIBLE_SSH_ARGS
vars:
- name: ansible_ssh_args
version_added: '2.7'
cli:
- name: ssh_args
ssh_common_args:
description: Common extra args for all ssh CLI tools
ini:
- section: 'ssh_connection'
key: 'ssh_common_args'
version_added: '2.7'
env:
- name: ANSIBLE_SSH_COMMON_ARGS
version_added: '2.7'
vars:
- name: ansible_ssh_common_args
cli:
- name: ssh_common_args
ssh_executable:
default: ssh
description:
- This defines the location of the ssh binary.
It defaults to ``ssh`` which will use the first ssh binary
available in $PATH.
- This option is usually not required, it might be useful when
access to system ssh is restricted,
or when using ssh wrappers to connect to remote hosts.
env: [{name: ANSIBLE_SSH_EXECUTABLE}]
ini:
- {key: ssh_executable, section: ssh_connection}
#const: ANSIBLE_SSH_EXECUTABLE
version_added: "2.2"
vars:
- name: ansible_ssh_executable
version_added: '2.7'
sftp_executable:
default: sftp
description:
- This defines the location of the sftp binary. It defaults to
``sftp`` which will use the first binary available in $PATH.
env: [{name: ANSIBLE_SFTP_EXECUTABLE}]
ini:
- {key: sftp_executable, section: ssh_connection}
version_added: "2.6"
vars:
- name: ansible_sftp_executable
version_added: '2.7'
scp_executable:
default: scp
description:
- This defines the location of the scp binary. It defaults to
`scp` which will use the first binary available in $PATH.
env: [{name: ANSIBLE_SCP_EXECUTABLE}]
ini:
- {key: scp_executable, section: ssh_connection}
version_added: "2.6"
vars:
- name: ansible_scp_executable
version_added: '2.7'
scp_extra_args:
description: Extra exclusive to the ``scp`` CLI
vars:
- name: ansible_scp_extra_args
env:
- name: ANSIBLE_SCP_EXTRA_ARGS
version_added: '2.7'
ini:
- key: scp_extra_args
section: ssh_connection
version_added: '2.7'
cli:
- name: scp_extra_args
sftp_extra_args:
description: Extra exclusive to the ``sftp`` CLI
vars:
- name: ansible_sftp_extra_args
env:
- name: ANSIBLE_SFTP_EXTRA_ARGS
version_added: '2.7'
ini:
- key: sftp_extra_args
section: ssh_connection
version_added: '2.7'
cli:
- name: sftp_extra_args
ssh_extra_args:
description: Extra exclusive to the 'ssh' CLI
vars:
- name: ansible_ssh_extra_args
env:
- name: ANSIBLE_SSH_EXTRA_ARGS
version_added: '2.7'
ini:
- key: ssh_extra_args
section: ssh_connection
version_added: '2.7'
cli:
- name: ssh_extra_args
retries:
description: Number of attempts to connect.
default: 3
type: integer
env:
- name: ANSIBLE_SSH_RETRIES
ini:
- section: connection
key: retries
- section: ssh_connection
key: retries
vars:
- name: ansible_ssh_retries
version_added: '2.7'
port:
description: Remote port to connect to.
type: int
ini:
- section: defaults
key: remote_port
env:
- name: ANSIBLE_REMOTE_PORT
vars:
- name: ansible_port
- name: ansible_ssh_port
remote_user:
description:
- User name with which to login to the remote server, normally
set by the remote_user keyword.
- If no user is supplied, Ansible will let the ssh client binary
choose the user as it normally
ini:
- section: defaults
key: remote_user
env:
- name: ANSIBLE_REMOTE_USER
vars:
- name: ansible_user
- name: ansible_ssh_user
cli:
- name: user
pipelining:
env:
- name: ANSIBLE_PIPELINING
- name: ANSIBLE_SSH_PIPELINING
ini:
- section: connection
key: pipelining
- section: ssh_connection
key: pipelining
vars:
- name: ansible_pipelining
- name: ansible_ssh_pipelining
private_key_file:
description:
- Path to private key file to use for authentication
ini:
- section: defaults
key: private_key_file
env:
- name: ANSIBLE_PRIVATE_KEY_FILE
vars:
- name: ansible_private_key_file
- name: ansible_ssh_private_key_file
cli:
- name: private_key_file
control_path:
description:
- This is the location to save ssh's ControlPath sockets, it uses
ssh's variable substitution.
- Since 2.3, if null (default), ansible will generate a unique hash.
Use `%(directory)s` to indicate where to use the control dir path
setting.
- Before 2.3 it defaulted to
`control_path=%(directory)s/ansible-ssh-%%h-%%p-%%r`.
- Be aware that this setting is ignored if `-o ControlPath` is set
in ssh args.
env:
- name: ANSIBLE_SSH_CONTROL_PATH
ini:
- key: control_path
section: ssh_connection
vars:
- name: ansible_control_path
version_added: '2.7'
control_path_dir:
default: ~/.ansible/cp
description:
- This sets the directory to use for ssh control path if the control
path setting is null.
- Also, provides the `%(directory)s` variable for the control
path setting.
env:
- name: ANSIBLE_SSH_CONTROL_PATH_DIR
ini:
- section: ssh_connection
key: control_path_dir
vars:
- name: ansible_control_path_dir
version_added: '2.7'
sftp_batch_mode:
default: 'yes'
description: 'TODO: write it'
env: [{name: ANSIBLE_SFTP_BATCH_MODE}]
ini:
- {key: sftp_batch_mode, section: ssh_connection}
type: bool
vars:
- name: ansible_sftp_batch_mode
version_added: '2.7'
ssh_transfer_method:
default: smart
description:
- "Preferred method to use when transferring files over ssh"
- Setting to 'smart' (default) will try them in order, until one
succeeds or they all fail
- Using 'piped' creates an ssh pipe with ``dd`` on either side to
copy the data
choices: ['sftp', 'scp', 'piped', 'smart']
env: [{name: ANSIBLE_SSH_TRANSFER_METHOD}]
ini:
- {key: transfer_method, section: ssh_connection}
scp_if_ssh:
default: smart
description:
- "Preferred method to use when transfering files over ssh"
- When set to smart, Ansible will try them until one succeeds or they
all fail
- If set to True, it will force 'scp', if False it will use 'sftp'
env: [{name: ANSIBLE_SCP_IF_SSH}]
ini:
- {key: scp_if_ssh, section: ssh_connection}
vars:
- name: ansible_scp_if_ssh
version_added: '2.7'
use_tty:
version_added: '2.5'
default: 'yes'
description: add -tt to ssh commands to force tty allocation
env: [{name: ANSIBLE_SSH_USETTY}]
ini:
- {key: usetty, section: ssh_connection}
type: bool
vars:
- name: ansible_ssh_use_tty
version_added: '2.7'
timeout:
default: 10
description:
- This is the default ammount of time we will wait while
establishing an ssh connection
- It also controls how long we can wait to access reading the
connection once established (select on the socket)
env:
- name: ANSIBLE_TIMEOUT
- name: ANSIBLE_SSH_TIMEOUT
version_added: '2.11'
ini:
- key: timeout
section: defaults
- key: timeout
section: ssh_connection
version_added: '2.11'
vars:
- name: ansible_ssh_timeout
version_added: '2.11'
cli:
- name: timeout
type: integer
lxc_host:
description:
The lxc host to connect to.
env:
- name: LXC_HOST
ini:
- key: lxc_host
section: lxc_ssh_connection
vars:
- name: lxc_host
cli:
- name: lxc_host
"""
try:
from __main__ import display
except ImportError:
from ansible.utils.display import Display
display = Display()
class AnsibleControlPersistBrokenPipeError(AnsibleError):
"""ControlPersist broken pipe"""
pass
def _ssh_retry(func):
"""
Decorator to retry ssh/scp/sftp in the case of a connection failure
Will retry if:
* an exception is caught
* ssh returns 255
Will not retry if
* remaining_tries is <2
* retries limit reached
"""
@wraps(func)
def wrapped(self, *args, **kwargs):
remaining_tries = int(self.get_option("retries")) + 1
cmd_summary = "%s..." % args[0]
for attempt in range(remaining_tries):
cmd = args[0]
if attempt != 0 and self._play_context.password and isinstance(cmd, list):
# If this is a retry, the fd/pipe for sshpass is closed,
# and we need a new one
self.sshpass_pipe = os.pipe()
cmd[1] = b"-d" + to_bytes(
self.sshpass_pipe[0],
nonstring="simplerepr",
errors="surrogate_or_strict",
)
try:
try:
return_tuple = func(self, *args, **kwargs)
display.vvv(return_tuple, host=self.host)
# 0 = success
# 1-254 = remote command return code
# 255 = failure from the ssh command itself
except (AnsibleControlPersistBrokenPipeError) as e:
# Retry one more time because of the ControlPersist
# broken pipe (see #16731)
display.vvv("RETRYING BECAUSE OF CONTROLPERSIST BROKEN PIPE")
return_tuple = func(self, *args, **kwargs)
if return_tuple[0] != 255:
break
else:
raise AnsibleConnectionFailure(
"Failed to connect to the host via ssh: %s"
% to_native(return_tuple[2])
)
except (AnsibleConnectionFailure, Exception) as e:
if attempt == remaining_tries - 1:
raise
else:
pause = 2 ** attempt - 1
if pause > 30:
pause = 30
if isinstance(e, AnsibleConnectionFailure):
msg = (
"ssh_retry: attempt: %d, ssh return code is 255. "
"cmd (%s), pausing for %d seconds"
% (attempt, cmd_summary, pause)
)
else:
msg = (
"ssh_retry: attempt: %d, caught exception(%s) "
"from cmd (%s), pausing for %d seconds"
% (attempt, e, cmd_summary, pause)
)
display.vv(msg, host=self.host)
time.sleep(pause)
continue
return return_tuple
return wrapped
class Connection(ConnectionBase):
"""ssh+lxc_attach connection"""
transport = "lxc_ssh"
def __init__(self, play_context, new_stdin, *args, **kwargs):
super(Connection, self).__init__(play_context, new_stdin, *args, **kwargs)
self.host = self._play_context.remote_addr
self.port = self._play_context.port
self.user = self._play_context.remote_user
self.control_path = None
self.control_path_dir = None
self.lxc_version = None
# LXC v1 uses 'lxc-info', 'lxc-attach' and so on
# LXC v2 uses just 'lxc'
(returncode2, stdout2, stderr2) = self._exec_command("which lxc", None, False)
(returncode1, stdout1, stderr1) = self._exec_command(
"which lxc-info", None, False
)
if returncode2 == 0:
self.lxc_version = 2
display.vvv("LXC v2")
elif returncode1 == 0:
self.lxc_version = 1
display.vvv("LXC v1")
else:
raise AnsibleConnectionFailure("Cannot identify LXC version")
sys.exit(1)
# The connection is created by running ssh/scp/sftp from the exec_command,
# put_file, and fetch_file methods, so we don't need to do any connection
# management here.
def _connect(self):
"""connect to the lxc; nothing to do here"""
display.vvv("XXX connect")
super(Connection, self)._connect()
self.container_name = self.get_option("lxc_host")
@staticmethod
def _create_control_path(host, port, user, connection=None):
"""Make a hash for the controlpath based on con attributes"""
pstring = "%s-%s-%s" % (host, port, user)
if connection:
pstring += "-%s" % connection
m = hashlib.sha1()
m.update(to_bytes(pstring))
digest = m.hexdigest()
cpath = "%(directory)s/" + digest[:10]
return cpath
@staticmethod
def _persistence_controls(b_command):
"""
Takes a command array and scans it for ControlPersist and ControlPath
settings and returns two booleans indicating whether either was found.
This could be smarter, e.g. returning false if ControlPersist is 'no',
but for now we do it simple way.
"""
controlpersist = False
controlpath = False
for b_arg in (a.lower() for a in b_command):
if b"controlpersist" in b_arg:
controlpersist = True
elif b"controlpath" in b_arg:
controlpath = True
return controlpersist, controlpath
@staticmethod
def _split_args(argstring):
"""
Takes a string like '-o Foo=1 -o Bar="foo bar"' and returns a
list ['-o', 'Foo=1', '-o', 'Bar=foo bar'] that can be added to
the argument list. The list will not contain any empty elements.
"""
if sys.version_info[0] >= 3:
return [
to_unicode(x.strip())
for x in shlex.split(to_bytes(argstring).decode())
if x.strip()
]
else:
return [
to_unicode(x.strip())
for x in shlex.split(to_bytes(argstring))
if x.strip()
]
def _add_args(self, b_command, b_args, explanation):
"""
Adds arguments to the ssh command and displays a caller-supplied
explanation of why.
:arg b_command: A list containing the command to add the new arguments
to. This list will be modified by this method.
:arg b_args: An iterable of new arguments to add. This iterable is
used more than once so it must be persistent (ie: a list is okay
but a StringIO would not)
:arg explanation: A text string containing explaining why the arguments
were added. It will be displayed with a high enough verbosity.
.. note:: This function does its work via side-effect.
The b_command list has the new arguments appended.
"""
display.vvvvv(
"SSH: %s: (%s)" % (explanation, ")(".join(to_text(a) for a in b_args)),
host=self._play_context.remote_addr,
)
b_command += b_args
def _build_command(self, binary, subsystem, *other_args):
"""
Takes an executable (ssh, scp, sftp or wrapper) and optional extra
arguments and returns the remote command wrapped in local ssh shell
commands and ready for execution.
:arg binary: actual executable to use to execute command.
:arg subsystem: type of executable provided, ssh/sftp/scp,
needed because wrappers for ssh might have diff names.
:arg other_args: dict of, value pairs passed as arguments to the ssh
binary
"""
b_command = []
conn_password = self.get_option("password") or self._play_context.password
#
# First, the command to invoke
#
# If we want to use password authentication, we have to set up a pipe to
# write the password to sshpass.
if conn_password:
if not self._sshpass_available():
raise AnsibleError(
"to use the 'ssh' connection type with passwords, "
" you must install the sshpass program"
)
self.sshpass_pipe = os.pipe()
b_command += [
b"sshpass",
b"-d"
+ to_bytes(
self.sshpass_pipe[0],
nonstring="simplerepr",
errors="surrogate_or_strict",
),
]
password_prompt = self.get_option("sshpass_prompt")
if password_prompt:
b_command += [
b"-P",
to_bytes(password_prompt, errors="surrogate_or_strict"),
]
b_command += [to_bytes(binary, errors="surrogate_or_strict")]
#
# Next, additional arguments based on the configuration.
#
# sftp batch mode allows us to correctly catch failed transfers, but can
# be disabled if the client side doesn't support the option. However,
# sftp batch mode does not prompt for passwords so it must be disabled
# if not using controlpersist and using sshpass
if subsystem == "sftp" and self.get_option("sftp_batch_mode"):
if conn_password:
b_args = [b"-o", b"BatchMode=no"]
self._add_args(b_command, b_args, "disable batch mode for sshpass")
b_command += [b"-b", b"-"]
if self._play_context.verbosity > 3:
b_command.append(b"-vvv")
# Next, we add ssh_args
ssh_args = self.get_option("ssh_args")
if ssh_args:
b_args = [
to_bytes(a, errors="surrogate_or_strict")
for a in self._split_ssh_args(ssh_args)
]
self._add_args(b_command, b_args, "ansible.cfg set ssh_args")
# Now we add various arguments that have their own specific settings
# defined in docs above.
if not self.get_option("host_key_checking"):
b_args = (b"-o", b"StrictHostKeyChecking=no")
self._add_args(
b_command,
b_args,
"ANSIBLE_HOST_KEY_CHECKING/host_key_checking disabled",
)
self.port = self.get_option("port")
if self.port is not None:
b_args = (
b"-o",
b"Port="
+ to_bytes(
self.port,
nonstring="simplerepr",
errors="surrogate_or_strict",
),
)
self._add_args(
b_command,
b_args,
"ANSIBLE_REMOTE_PORT/remote_port/ansible_port set",
)
key = self.get_option("private_key_file")
if key:
b_args = (
b"-o",
b'IdentityFile="'
+ to_bytes(os.path.expanduser(key), errors="surrogate_or_strict")
+ b'"',
)
self._add_args(
b_command,
b_args,
"ANSIBLE_PRIVATE_KEY_FILE/private_key_file/"
"ansible_ssh_private_key_file set",
)
if not conn_password:
self._add_args(
b_command,
(
b"-o",
b"KbdInteractiveAuthentication=no",
b"-o",
b"PreferredAuthentications=publickey,gssapi-with-mic,"
b"gssapi-keyex,hostbased",
b"-o",
b"PasswordAuthentication=no",
),
"ansible_password/ansible_ssh_password not set",
)
self.user = self.get_option("remote_user")
if self.user:
self._add_args(
b_command,
(
b"-o",
b'User="%s"' % to_bytes(self.user, errors="surrogate_or_strict"),
),
"ANSIBLE_REMOTE_USER/remote_user/ansible_user/user/-u set",
)
timeout = self.get_option("timeout")
self._add_args(
b_command,
(
b"-o",
b"ConnectTimeout="
+ to_bytes(
timeout,
errors="surrogate_or_strict",
nonstring="simplerepr",
),
),
"ANSIBLE_TIMEOUT/timeout set",
)
# Add in any common or binary-specific arguments from the PlayContext
# (i.e. inventory or task settings or overrides on the command line).
for opt in ("ssh_common_args", "{0}_extra_args".format(subsystem)):
attr = self.get_option(opt)
if attr is not None:
b_args = [
to_bytes(a, errors="surrogate_or_strict")
for a in self._split_ssh_args(attr)
]
self._add_args(b_command, b_args, "Set %s" % opt)
# Check if ControlPersist is enabled and add a ControlPath if one hasn't
# already been set.
controlpersist, controlpath = self._persistence_controls(b_command)
if controlpersist:
self._persistent = True
if not controlpath:
self.control_path_dir = self.get_option("control_path_dir")
cpdir = unfrackpath(self.control_path_dir)
b_cpdir = to_bytes(cpdir, errors="surrogate_or_strict")
# The directory must exist and be writable.
makedirs_safe(b_cpdir, 0o700)
if not os.access(b_cpdir, os.W_OK):
raise AnsibleError(
"Cannot write to ControlPath %s" % to_native(cpdir)
)
self.control_path = self.get_option("control_path")
if not self.control_path:
self.control_path = self._create_control_path(
self.host, self.port, self.user
)
b_args = (
b"-o",
b"ControlPath="
+ to_bytes(
self.control_path % dict(directory=cpdir),
errors="surrogate_or_strict",
),
)
self._add_args(
b_command,
b_args,
"found only ControlPersist; added ControlPath",
)
# Finally, we add any caller-supplied extras.
if other_args:
b_command += [to_bytes(a) for a in other_args]
return b_command
def _send_initial_data(self, fh, in_data):
"""
Writes initial data to the stdin filehandle of the subprocess and closes
it. (The handle must be closed; otherwise, for example, "sftp -b -" will
just hang forever waiting for more commands.)
"""
display.debug("Sending initial data")
try:
fh.write(to_bytes(in_data))
fh.close()
except (OSError, IOError):
raise AnsibleConnectionFailure(
'SSH Error: data could not be sent to remote host "%s". '
"Make sure this host can be reached over ssh" % self.host
)
display.debug("Sent initial data (%d bytes)" % len(in_data))
# Used by _run() to kill processes on failures
@staticmethod
def _terminate_process(p):
"""Terminate a process, ignoring errors"""
try:
p.terminate()
except (OSError, IOError):
pass
# This is separate from _run() because we need to do the same
# thing for stdout and stderr.
def _examine_output(self, source, state, b_chunk, sudoable):
"""
Takes a string, extracts complete lines from it, tests to see if they
are a prompt, error message, etc., and sets appropriate flags in self.
Prompt and success lines are removed.
Returns the processed (i.e. possibly-edited) output and the unprocessed
remainder (to be processed with the next chunk) as strings.
"""
output = []
for b_line in b_chunk.splitlines(True):
display_line = to_text(b_line).rstrip("\r\n")
suppress_output = False
if self._play_context.prompt and self.check_password_prompt(b_line):
display.debug(
"become_prompt: (source=%s, state=%s): '%s'"
% (source, state, display_line)
)
self._flags["become_prompt"] = True
suppress_output = True
elif self._play_context.success_key and self.check_become_success(b_line):
display.debug(
"become_success: (source=%s, state=%s): '%s'"
% (source, state, display_line)
)
self._flags["become_success"] = True
suppress_output = True
elif sudoable and self.check_incorrect_password(b_line):
display.debug(
"become_error: (source=%s, state=%s): '%s'"
% (source, state, display_line)
)
self._flags["become_error"] = True
elif sudoable and self.check_missing_password(b_line):
display.debug(
"become_nopasswd_error: (source=%s, state=%s): '%s'"
% (source, state, display_line)
)
self._flags["become_nopasswd_error"] = True
if not suppress_output:
output.append(b_line)
# The chunk we read was most likely a series of complete lines, but just
# in case the last line was incomplete (and not a prompt, which we would
# have removed from the output), we retain it to be processed with the
# next chunk.
remainder = b""
if output and not output[-1].endswith(b"\n"):
remainder = output[-1]
output = output[:-1]
return b"".join(output), remainder
def _bare_run(self, cmd, in_data, sudoable=True, checkrc=True):
"""
Starts the command and communicates with it until it ends.
"""
display_cmd = list(map(shlex_quote, map(to_text, cmd)))
display.vvv("SSH: EXEC {0}".format(" ".join(display_cmd)), host=self.host)
# Start the given command. If we don't need to pipeline data, we can try
# to use a pseudo-tty (ssh will have been invoked with -tt). If we are
# pipelining data, or can't create a pty, we fall back to using plain
# old pipes.
p = None
if isinstance(cmd, (text_type, binary_type)):
cmd = to_bytes(cmd)
else:
if sys.version_info[0] >= 3:
cmd = list(map(to_bytes, cmd))
else:
cmd = map(to_bytes, cmd)
if not in_data:
try:
# Make sure stdin is a proper pty to avoid tcgetattr errors
master, slave = pty.openpty()
if PY3 and self._play_context.password:
p = subprocess.Popen(
cmd,
stdin=slave,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
pass_fds=self.sshpass_pipe,
)
else:
p = subprocess.Popen(
cmd,
stdin=slave,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
stdin = os.fdopen(master, "wb", 0)
os.close(slave)
except (OSError, IOError):
p = None
if not p:
if PY3 and self._play_context.password:
p = subprocess.Popen(
cmd,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
pass_fds=self.sshpass_pipe,
)
else:
p = subprocess.Popen(
cmd,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
stdin = p.stdin
# If we are using SSH password authentication, write the password into
# the pipe we opened in _build_command.
if self._play_context.password:
os.close(self.sshpass_pipe[0])
try:
os.write(
self.sshpass_pipe[1],
to_bytes(self._play_context.password) + b"\n",
)
except OSError as e:
# Ignore broken pipe errors if the sshpass process has exited.
if e.errno != errno.EPIPE or p.poll() is None:
raise