我家的Ansible渴望突如其来地死去

首先

这是《Ansible Advent Calendar 2017》的第10篇文章。
这是一个有趣的话题。

我认为很多人都知道在Ansible任务输出中可以使用cowsay。

    • AnsibleのPlaybook実行時に牛とゆかいな仲間たちを表示させる

 

    Ansible×Cowsay
__________________ 
< PLAY [localhost] >
------------------ 
       \   ^__^
        \  (oo)\_______
           (__)\       )\/\
               ||----w |
               ||     ||

_________________________  
< TASK [Gathering Facts] >
------------------------- 
       \   ^__^
        \  (oo)\_______
           (__)\       )\/\
               ||----w |
               ||     ||

如果你安装了cowsay,没有做任何特殊的设置,那么Ansible的消息就会被cowsay转化,而那些不知道如何使用cowsay的人可能会陷入恐慌之中。顺便提一下,这是两年前的我。

对于那个Ansible的cowsay输出,我决定尝试使用与cowsay相似的有趣命令echo-sd来输出。

顺便说一下,在这篇文章中所介绍的方法是直接修改核心源代码,也就是所谓的“脑袋肌肉玩法”。按照 Ansible 的设计,本应采用类似下面这篇文章中所介绍的 Callback 插件机制来实现。

    Ansibleのcallback pluginを使って突然の死(echo-sd)を表現する

在哪里改动

我想做的是“发现Ansible正在cowsay的地方,并将其替换为echo-sd”。
因此,我会查看Ansible代码,找到它与cowsay的连接点。
由于是开源的,所以可以自由地查看和修改源代码,太棒了。

ansible/ansible – GitHub

安装手册和文档以及 ansible 的其它信息的源头。

首先,让我们在代码库中诚实地使用“cowsay”进行搜索。

搜索- cowsay

有4个文件被命中。

    • lib/ansible/utils/display.py

 

    • docs/docsite/rst/faq.rst

 

    • examples/ansible.cfg

 

    lib/ansible/config/base.yml

看起来不太需要去看了。
十有八九的可能是 display.py 是罪犯。

b_COW_PATHS = (
    b"/usr/bin/cowsay",
    b"/usr/games/cowsay",
    b"/usr/local/bin/cowsay",  # BSD path for cowsay
    b"/opt/local/bin/cowsay",  # MacPorts path for cowsay
)

因为包含这样的东西,所以看起来是肯定的罪犯。
似乎已经考虑了不同操作系统微妙地有不同的cowsay命令路径问题。太棒了。

改良的准备工作

为了改造,我会获取源代码。我将使用最新的稳定版本v2.4.2.0-1来作为代码基础。

# Ansibleリポジトリをクローン
$ git clone https://github.com/ansible/ansible.git
$ cd ansible
$ git checkout v2.4.2.0-1

# 実行環境をセットアップ
$ source ./hacking/env-setup
$ ansible --version
ansible 2.4.2.0 (detached HEAD e3a8bf02ac) last updated 2017/12/10 02:06:21 (GMT +900)
  config file = None
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /opt/ansible/lib/ansible
  executable location = /opt/ansible/bin/ansible
  python version = 2.7.5 (default, Nov  6 2016, 00:28:07) [GCC 4.8.5 20150623 (Red Hat 4.8.5-11)]

请点击此处查看确认执行的Playbook。

- hosts: localhost
  user: ansible
  tasks:
    - name: Display message
      debug:
        msg: "突然の死"

这是平时的消息。

$ ansible-playbook -i hosts echo-sd.yml

PLAY [localhost] *********************************************************************************************

TASK [Gathering Facts] ***************************************************************************************
ok: [localhost]

TASK [Display message] ***************************************************************************************
ok: [localhost] => {
    "msg": "突然の死"
}

PLAY RECAP ***************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0

怎样处理

尽管这很简单粗暴,但如果我们尝试将echo-sd代替cowsay,会发生什么呢?

b_COW_PATHS = (
    b"/usr/local/bin/echo-sd", # echo-sdのパス
)

如果能顺利进行,就会大赚一笔,带着祈祷的心情,让我们尝试一下…!

$ ansible-playbook -i hosts echo-sd.yml


ok: [localhost]

ok: [localhost] => {
    "msg": "echo-sd !!!"
}

localhost                  : ok=2    changed=0    unreachable=0    failed=0

$ echo-sd 何も出ない
_人人人人人人人_
> 何も出ない <
 ̄Y^Y^Y^Y^Y^Y^Y^ ̄

嗯,事情并不会像预期的那样顺利进行。让我们认真地继续努力吧。

完美版本

我会按照顺序逐步解释,暂时折叠起来。事实上,我先完成了版本,然后需要修改两个文件。

lib/ansible/utils/display.py# (c) 2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# 这个文件是Ansible的一部分
#
# Ansible是自由软件:您可以根据自由软件基金会发布的GNU通用公共许可证的条款重新分发或修改它
# 或(根据您的选择)任何后续版本。
#
# Ansible希望它是有用的,但没有任何担保;甚至没有适销性或适用性的暗示保证。
# 有关更多详细信息,请参阅GNU通用公共许可证。
#
# 您应该收到与Ansible的GNU通用公共许可证一起的副本。
# 如果没有,参阅<http://www.gnu.org/licenses/>。

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import errno
import fcntl
import getpass
import locale
import logging
import os
import random
import subprocess
import sys
import textwrap
import time

from struct import unpack, pack
from termios import TIOCGWINSZ

from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.module_utils._text import to_bytes, to_text
from ansible.utils.color import stringc

try:
# Python 2
input = raw_input
except NameError:
# Python 3, we already have raw_input
pass

logger = None
# TODO: make this a logging callback instead
if C.DEFAULT_LOG_PATH:
path = C.DEFAULT_LOG_PATH
if (os.path.exists(path) and os.access(path, os.W_OK)) or os.access(os.path.dirname(path), os.W_OK):
logging.basicConfig(filename=path, level=logging.DEBUG, format=’%(asctime)s %(name)s %(message)s’)
mypid = str(os.getpid())
user = getpass.getuser()
logger = logging.getLogger(“p=%s u=%s | ” % (mypid, user))
else:
print(“[WARNING]: log file at %s is not writeable and we cannot create it, aborting\n” % path, file=sys.stderr)

b_ECHO_SD_PATHS = (
b”/usr/local/bin/echo-sd”, # echo-sd的路径
)

b_ECHO_SD_STYLES = (
b”vertical”,
b”tanzaku”,
b”default”,
)

class Display:

def __init__(self, verbosity=0):

self.columns = None
self.verbosity = verbosity

# 防止重复显示所有弃用消息的列表
self._deprecations = {}
self._warns = {}
self._errors = {}

self.b_echo_sd = None
self.nonsd = C.ANSIBLE_SD_SELECTION

self.set_echo_sd_info()

self._set_column_width()

def set_echo_sd_info(self):
if not C.ANSIBLE_NOSD:
for b_echo_sd_path in b_ECHO_SD_PATHS:
if os.path.exists(b_echo_sd_path):
self.b_echo_sd = b_echo_sd_path

def display(self, msg, color=None, stderr=False, screen_only=False, log_only=False):
“””向用户显示消息

注意:msg必须是一个Unicode字符串,以防止UnicodeError traceback。
“””

nocolor = msg
if color:
msg = stringc(msg, color)

if not log_only:
if not msg.endswith(u’\n’):
msg2 = msg + u’\n’
else:
msg2 = msg

msg2 = to_bytes(msg2, encoding=self._output_encoding(stderr=stderr))
if sys.version_info >= (3,):
# 在python3上将其转换回文本字符串
# 我们首先将其转换为字节字符串,以摆脱用户区域设置中无效的字符
msg2 = to_text(msg2, self._output_encoding(stderr=stderr), errors=’replace’)

if not stderr:
fileobj = sys.stdout
else:
fileobj = sys.stderr

fileobj.write(msg2)

try:
fileobj.flush()
except IOError as e:
# 忽略EPIPE(指示文件对象已过早关闭)的错误,例如管道到“head -n1”
if e.errno != errno.EPIPE:
raise

if logger and not screen_only:
msg2 = nocolor.lstrip(u’\n’)

msg2 = to_bytes(msg2)
if sys.version_info >= (3,):
# 在python3上将其转换回文本字符串
# 我们首先将其转换为字节字符串,以摆脱用户区域设置中无效的字符
msg2 = to_text(msg2, self._output_encoding(stderr=stderr))

if color == C.COLOR_ERROR:
logger.error(msg2)
else:
logger.info(msg2)

def v(self, msg, host=None):
return self.verbose(msg, host=host, caplevel=0)

def vv(self, msg, host=None):
return self.verbose(msg, host=host, caplevel=1)

def vvv(self, msg, host=None):
return self.verbose(msg, host=host, caplevel=2)

def vvvv(self, msg, host=None):
return self.verbose(msg, host=host, caplevel=3)

def vvvvv(self, msg, host=None):
return self.verbose(msg, host=host, caplevel=4)

def vvvvvv(self, msg, host=None):
return self.verbose(msg, host=host, caplevel=5)

def debug(self, msg):
if C.DEFAULT_DEBUG:
self.display(“%6d %0.5f: %s” % (os.getpid(), time.time(), msg), color=C.COLOR_DEBUG)

def verbose(self, msg, host=None, caplevel=2):
if self.verbosity > caplevel:
if host is None:
self.display(msg, color=C.COLOR_VERBOSE)
else:
self

lib/ansible/config/base.yml# Copyright (c) 2017 Ansible Project
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

ACCELERATE_CONNECT_TIMEOUT:
default: 1.0
description:
– “This setting controls the timeout for the socket connect call, and should be kept relatively low.
The connection to the accelerate_port will be attempted 3 times before Ansible will fall back to ssh or paramiko
(depending on your default connection setting) to try and start the accelerate daemon remotely.”
– “Note, this value can be set to less than one second, however it is probably not a good idea to do so
unless you are on a very fast and reliable LAN. If you are connecting to systems over the internet, it may be necessary to increase this timeout.”
env: [{name: ACCELERATE_CONNECT_TIMEOUT }]
ini:
– {key: accelerate_connect_timeout, section: accelerate}
type: float
deprecated:
why: Removing accelerate as a connection method, settings not needed either.
version: “2.5”
alternatives: ssh and paramiko
version_added: “1.4”
ACCELERATE_DAEMON_TIMEOUT:
default: 30
description:
– This setting controls the timeout for the accelerated daemon, as measured in minutes. The default daemon timeout is 30 minutes.
– “Prior to 1.6, the timeout was hard-coded from the time of the daemon’s launch.”
– For version 1.6+, the timeout is now based on the last activity to the daemon and is configurable via this option.
env: [{name: ACCELERATE_DAEMON_TIMEOUT}]
ini:
– {key: accelerate_daemon_timeout, section: accelerate}
type: integer
deprecated:
why: Removing accelerate as a connection method, settings not needed either.
version: “2.5”
alternatives: ssh and paramiko
version_added: “1.6”
ACCELERATE_KEYS_DIR:
default: ~/.fireball.keys
description: ”
deprecated:
why: Removing accelerate as a connection method, settings not needed either.
version: “2.5”
alternatives: ssh and paramiko
env: [{name: ACCELERATE_KEYS_DIR}]
ini:
– {key: accelerate_keys_dir, section: accelerate}
ACCELERATE_KEYS_DIR_PERMS:
default: ‘700’
description: ‘TODO: write it’
env: [{name: ACCELERATE_KEYS_DIR_PERMS}]
ini:
– {key: accelerate_keys_dir_perms, section: accelerate}
deprecated:
why: Removing accelerate as a connection method, settings not needed either.
version: “2.5”
alternatives: ssh and paramiko
ACCELERATE_KEYS_FILE_PERMS:
default: ‘600’
description: ‘TODO: write it’
env: [{name: ACCELERATE_KEYS_FILE_PERMS}]
ini:
– {key: accelerate_keys_file_perms, section: accelerate}
deprecated:
why: Removing accelerate as a connection method, settings not needed either.
version: “2.5”
alternatives: ssh and paramiko
ACCELERATE_MULTI_KEY:
default: False
description: ‘TODO: write it’
env: [{name: ACCELERATE_MULTI_KEY}]
ini:
– {key: accelerate_multi_key, section: accelerate}
type: boolean
deprecated:
why: Removing accelerate as a connection method, settings not needed either.
version: “2.5”
alternatives: ssh and paramiko
ACCELERATE_PORT:
default: 5099
description: ‘TODO: write it’
env: [{name: ACCELERATE_PORT}]
ini:
– {key: accelerate_port, section: accelerate}
type: integer
deprecated:
why: Removing accelerate as a connection method, settings not needed either.
version: “2.5”
alternatives: ssh and paramiko
ACCELERATE_TIMEOUT:
default: 30
description: ‘TODO: write it’
env: [{name: ACCELERATE_TIMEOUT}]
ini:
– {key: accelerate_timeout, section: accelerate}
type: integer
deprecated:
why: Removing accelerate as a connection method, settings not needed either.
version: “2.5”
alternatives: ssh and paramiko
ALLOW_WORLD_READABLE_TMPFILES:
name: Allow world readable temporary files
default: False
description:
– This makes the temporary files created on the machine to be world readable and will issue a warning instead of failing the task.
– It is useful when becoming an unprivileged user.
env: []
ini:
– {key: allow_world_readable_tmpfiles, section: defaults}
type: boolean
yaml: {key: defaults.allow_world_readable_tmpfiles}
version_added: “2.1”
ANSIBLE_SD_SELECTION:
name: echo-sd style selection
default: default
description: This allows you to chose a specific echo-sd style for the banners or use ‘random’ to cycle through them.
env: [{name: ANSIBLE_SD_SELECTION}]
ini:
– {key: sd_selection, section: defaults}
ANSIBLE_FORCE_COLOR:
name: Force color output
default: False
description: This options forces color mode even when running without a TTY or the “nocolor” setting is True.
env: [{name: ANSIBLE_FORCE_COLOR}]
ini:
– {key: force_color, section: defaults}
type: boolean
yaml: {key: display.force_color}
ANSIBLE_NOCOLOR:
name: Suppress color output
default: False
description: This setting allows suppressing colorizing output, which is used to give a better indication of failure and status information.
env: [{name: ANSIBLE_NOCOLOR}]
ini:
– {key: nocolor, section: defaults}
type: boolean
yaml: {key: display.nocolor}
ANSIBLE_NOSD:
name: Suppress echo-sd output
default: False
description: If you have echo-sd installed but want to avoid the ‘echo-sd’ (why????), use this.
env: [{name: ANSIBLE_NOSD}]
ini:
– {key: nosd, section: defaults}
type: boolean
yaml: {key: display.i_am_no_fun}
ANSIBLE_PIPELINING:
name: Connection pipelining
default: False
description:
– Pipelining, if supported by the connection plugin, reduces the number of network operations required to execute a module on the remote server,
by executing many Ansible modules without actual file transfer.
– This can result in a very significant performance improvement when enabled.
– “However this conflicts with privilege escalation (become). For example, when using ‘sudo:’ operations you must first
disable ‘requiretty’ in /etc/sudoers on all managed hosts, which is why it is disabled by default.”
env:
– name: ANSIBLE_PIPELINING
– name: ANSIBLE_SSH_PIPELINING
ini:
– section: connection
key: pipelining
– section: ssh_connection
key: pipelining
type: boolean
yaml: {key: plugins.connection.pipelining}
ANSIBLE_SSH_ARGS:
# TODO: move to ssh plugin
default: -C -o ControlMaster=auto -o ControlPersist=60s
description:
– If set, this will override the Ansible default ssh arguments.
– In particular, users may wish to raise the ControlPersist time to encourage performance. A value of 30 minutes may be appropriate.
– Be aware that if `-o ControlPath` is set in ssh_args, the control path setting is not used.
env: [{name: ANSIBLE_SSH_ARGS}]
ini:
– {key: ssh_args, section: ssh_connection}
yaml: {key: ssh_connection.ssh_args}
ANSIBLE_SSH_CONTROL_PATH:
# TODO: move to ssh plugin
default: null
description:
– This is the location to save ssh’s ControlPath sockets, it uses ssh’s variable substitution.
– Since 2.3, if null, 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}
yaml: {key: ssh_connection.control_path}
ANSIBLE_SSH_CONTROL_PATH_DIR:
# TODO: move to ssh plugin
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:
– {key: control_path_dir, section: ssh_connection}
yaml: {key: ssh_connection.control_path_dir}
ANSIBLE_SSH_EXECUTABLE:
# TODO: move to ssh plugin
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}
yaml: {key: ssh_connection.ssh_executable}
version_added: “2.2”
ANSIBLE_SSH_RETRIES:
# TODO: move to ssh plugin
default: 0
description: Number of attempts to establish a connection before we give up and report the host as ‘UNREACHABLE’
env: [{name: ANSIBLE_SSH_RETRIES}]
ini:
– {key: retries, section: ssh_connection}
type: integer
yaml: {key: ssh_connection.retries}
ANY_ERRORS_FATAL:
name: Make Task failures fatal
default: False
description: Sets the default value for the any_errors_fatal keyword, if True, Task failures will be considered fatal errors.
env:
– name: ANSIBLE_ANY_ERRORS_FATAL
ini:
– section: defaults
key: any_errors_fatal
type: boolean
yaml: {key: errors.any_task_errors_fatal}
version_added: “2.4”
BECOME_ALLOW_SAME_USER:
name: Allow becomming the same user
default: False
description: This setting controls if become is skipped when remote user and become user are the same. I.E root sudo to root.
env: [{name: ANSIBLE_BECOME_ALLOW_SAME_USER}]
ini:
– {key: become_allow_same_user, section: privilege_escalation}
type: boolean
yaml: {key: privilege_escalation.become_allow_same_user}
CACHE_PLUGIN:
name: Persistent Cache plugin
default: memory
description: Chooses which cache plugin to use, the default ‘memory’ is ephimeral.
env: [{name: ANSIBLE_CACHE_PLUGIN}]
ini:
– {key: fact_caching, section: defaults}
yaml: {key: facts.cache.plugin}
CACHE_PLUGIN_CONNECTION:
name: Cache Plugin URI
default: ~
description: Defines connection or path information for the cache plugin
env: [{name: ANSIBLE_CACHE_PLUGIN_CONNECTION}]
ini:
– {key: fact_caching_connection, section: defaults}
yaml: {key: facts.cache.uri}
CACHE_PLUGIN_PREFIX:
name: Cache Plugin table prefix
default: ansible_facts
description: Prefix to use for cache plugin files/tables
env: [{name: ANSIBLE_CACHE_PLUGIN_PREFIX}]
ini:
– {key: fact_caching_prefix, section: defaults}
yaml: {key: facts.cache.prefix}
CACHE_PLUGIN_TIMEOUT:
name: Cache Plugin expiration timeout
default: 86400
description: Expiration timeout for the cache plugin data
env: [{name: ANSIBLE_CACHE_PLUGIN_TIMEOUT}]
ini:
– {key: fact_caching_timeout, section: defaults}
type: integer
yaml: {key: facts.cache.timeout}
COLOR_CHANGED:
name: Color for ‘changed’ task status
default: yellow
description: Defines the color to use on ‘Changed’ task status
env: [{name: ANSIBLE_COLOR_CHANGED}]
ini:
– {key: changed, section: colors}
yaml: {key: display.colors.changed}
COLOR_DEBUG:
name: Color for debug statements
default: dark gray
description: Defines the color to use when emitting debug messages
env: [{name: ANSIBLE_COLOR_DEBUG}]
ini:
– {key: debug, section: colors}
yaml: {key: display.colors.debug}
COLOR_DEPRECATE:
name: Color for deprecation messages
default: purple
description: Defines the color to use when emitting deprecation messages
env: [{name: ANSIBLE_COLOR_DEPRECATE}]
ini:
– {key: deprecate, section: colors}
yaml: {key: display.colors.deprecate}
COLOR_DIFF_ADD:
name: Color for diff added display
default: green
description: Defines the color to use when showing added lines in diffs
env: [{name: ANSIBLE_COLOR_DIFF_ADD}]
ini:
– {key: diff_add, section: colors}
yaml: {key: display.colors.diff.add}
COLOR_DIFF_LINES:
name: Color for diff lines display
default: cyan
description: Defines the color to use when showing diffs
env: [{name: ANSIBLE_COLOR_DIFF_LINES}]
ini:
– {key: diff_lines, section: colors}
COLOR_DIFF_REMOVE:
name: Color for diff removed display
default: red
description: Defines the color to use when showing removed lines in diffs
env: [{name: ANSIBLE_COLOR_DIFF_REMOVE}]
ini:
– {key: diff_remove, section: colors}
COLOR_ERROR:
name: Color for error messages
default: red
description: Defines the color to use when emitting error messages
env: [{name: ANSIBLE_COLOR_ERROR}]
ini:
– {key: error, section: colors}
yaml: {key: colors.error}
COLOR_HIGHLIGHT:
name: Color for highlighting
default: white
description: Color used for highlights
env: [{name: ANSIBLE_COLOR_HIGHLIGHT}]
ini:
– {key: highlight, section: colors}
COLOR_OK:
name: Color for ‘ok’ task status
default: green
description: Defines the color to use when showing ‘OK’ task status
env: [{name: ANSIBLE_COLOR_OK}]
ini:
– {key: ok, section: colors}
COLOR_SKIP:
name: Color for ‘skip’ task status
default: cyan
description: Defines the color to use when showing ‘Skipped’ task status
env: [{name: ANSIBLE_COLOR_SKIP}]
ini:
– {key: skip, section: colors}
COLOR_UNREACHABLE:
name: Color for ‘unreachable’ host state
default: bright red
description: Defines the color to use on ‘Unreachable’ status
env: [{name: ANSIBLE_COLOR_UNREACHABLE}]
ini:
– {key: unreachable, section: colors}
COLOR_VERBOSE:
name: Color for verbose messages
default: blue
description: Defines the color to use when emitting verbose messages. i.e those that show with ‘-v’s.
env: [{name: ANSIBLE_COLOR_VERBOSE}]
ini:
– {key: verbose, section: colors}
COLOR_WARN:
name: Color for warning messages
default: bright purple
description: Defines the color to use when emitting warning messages
env: [{name: ANSIBLE_COLOR_WARN}]
ini:
– {key: warn, section: colors}
COMMAND_WARNINGS:
name: Command module warnings
default: True
description:
– By default Ansible will issue a warning when the shell or command module is used and the command appears to be similar to an existing Ansible module.
– These warnings can be silenced by adjusting this setting to False. You can also control this at the task level with the module optoin “warn“.
env: [{name: ANSIBLE_COMMAND_WARNINGS}]
ini:
– {key: command_warnings, section: defaults}
type: boolean
version_added: “1.8”
DEFAULT_ACTION_PLUGIN_PATH:
name: Action plugins path
default: ~/.ansible/plugins/action:/usr/share/ansible/plugins/action
description: Colon separated paths in which Ansible will search for Action Plugins.
env: [{name: ANSIBLE_ACTION_PLUGINS}]
ini:
– {key: action_plugins, section: defaults}
type: pathspec
yaml: {key: plugins.action.path}
DEFAULT_ALLOW_UNSAFE_LOOKUPS:
name: Allow unsafe lookups
default: False
description:
– “When enabled, this option allows lookup plugins (whether used in variables as “{{lookup(‘foo’)}}“ or as a loop as with_foo)
to return data that is not marked ‘unsafe’.”
– By default, such data is marked as unsafe to prevent the templating engine from evaluating any jinja2 templating language,
as this could represent a security risk. This option is provided to allow for backwards-compatibility,
however users should first consider adding allow_unsafe=True to any lookups which may be expected to contain data which may be run
through the templating engine late
env: []
ini:
– {key: allow_unsafe_lookups, section: defaults}
type: boolean
version_added: “2.2.3”
DEFAULT_ASK_PASS:
name: Ask for the login password
default: False
description:
– This controls whether an Ansible playbook should prompt for a login password.
If using SSH keys for authentication, you probably do not needed to change this setting.
env: [{name: ANSIBLE_ASK_PASS}]
ini:
– {key: ask_pass, section: defaults}
type: boolean
yaml: {key: defaults.ask_pass}
DEFAULT_ASK_SUDO_PASS:
name: Ask for the sudo password
default: False
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
description:
– This controls whether an Ansible playbook should prompt for a sudo password.
env: [{name: ANSIBLE_ASK_SUDO_PASS}]
ini:
– {key: ask_sudo_pass, section: defaults}
type: boolean
DEFAULT_ASK_SU_PASS:
name: Ask for the su password
default: False
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
description:
– This controls whether an Ansible playbook should prompt for a su password.
env: [{name: ANSIBLE_ASK_SU_PASS}]
ini:
– {key: ask_su_pass, section: defaults}
type: boolean
DEFAULT_ASK_VAULT_PASS:
name: Ask for the vault password(s)
default: False
description:
– This controls whether an Ansible playbook should prompt for a vault password.
env: [{name: ANSIBLE_ASK_VAULT_PASS}]
ini:
– {key: ask_vault_pass, section: defaults}
type: boolean
DEFAULT_BECOME:
name: Enable privilege escalation (become)
default: False
description: Toggles the use of privilege escalation, allowing you to ‘become’ another user after login.
env: [{name: ANSIBLE_BECOME}]
ini:
– {key: become, section: privilege_escalation}
type: boolean
DEFAULT_BECOME_ASK_PASS:
name: Ask for the privelege escalation (become) password
default: False
description: Toggle to prompt for privilege escalation password.
env: [{name: ANSIBLE_BECOME_ASK_PASS}]
ini:
– {key: become_ask_pass, section: privilege_escalation}
type: boolean
DEFAULT_BECOME_METHOD:
name: Choose privilege escalation method
default: ‘sudo’
description: Privilege escalation method to use when `become` is enabled.
env: [{name: ANSIBLE_BECOME_METHOD}]
ini:
– {section: privilege_escalation, key: become_method}
DEFAULT_BECOME_EXE:
name: Choose ‘become’ executable
default: ~
description: ‘executable to use for privilege escalation, otherwise Ansible will depend on PATH’
env: [{name: ANSIBLE_BECOME_EXE}]
ini:
– {key: become_exe, section: privilege_escalation}
DEFAULT_BECOME_FLAGS:
name: Set ‘become’ executable options
default: ”
description: Flags to pass to the privilege escalation executable.
env: [{name: ANSIBLE_BECOME_FLAGS}]
ini:
– {key: become_flags, section: privilege_escalation}
DEFAULT_BECOME_USER:
# FIXME: should really be blank and make -u passing optional depending on it
name: Set the user you ‘become’ via privlege escalation
default: root
description: The user your login/remote user ‘becomes’ when using privilege escalation, most systems will use ‘root’ when no user is specified.
env: [{name: ANSIBLE_BECOME_USER}]
ini:
– {key: become_user, section: privilege_escalation}
yaml: {key: become.user}
DEFAULT_CACHE_PLUGIN_PATH:
name: Cache Plugins Path
default: ~/.ansible/plugins/cache:/usr/share/ansible/plugins/cache
description: Colon separated paths in which Ansible will search for Cache Plugins.
env: [{name: ANSIBLE_CACHE_PLUGINS}]
ini:
– {key: cache_plugins, section: defaults}
type: pathspec
DEFAULT_CALLABLE_WHITELIST:
name: Template ‘callable’ whitelist
default: []
description: Whitelist of callable methods to be made available to template evaluation
env: [{name: ANSIBLE_CALLABLE_WHITELIST}]
ini:
– {key: callable_whitelist, section: defaults}
type: list
DEFAULT_CALLBACK_PLUGIN_PATH:
name: Callback Plugins Path
default: ~/.ansible/plugins/callback:/usr/share/ansible/plugins/callback
description: Colon separated paths in which Ansible will search for Callback Plugins.
env: [{name: ANSIBLE_CALLBACK_PLUGINS}]
ini:
– {key: callback_plugins, section: defaults}
type: pathspec
yaml: {key: plugins.callback.path}
DEFAULT_CALLBACK_WHITELIST:
name: Callback Whitelist
default: []
description:
– “List of whitelisted callbacks, not all callbacks need whitelisting,
but many of those shipped with Ansible do as we don’t want them activated by default.”
env: [{name: ANSIBLE_CALLBACK_WHITELIST}]
ini:
– {key: callback_whitelist, section: defaults}
type: list
yaml: {key: plugins.callback.whitelist}
DEFAULT_CONNECTION_PLUGIN_PATH:
name: Connection Plugins Path
default: ~/.ansible/plugins/connection:/usr/share/ansible/plugins/connection
description: Colon separated paths in which Ansible will search for Connection Plugins.
env: [{name: ANSIBLE_CONNECTION_PLUGINS}]
ini:
– {key: connection_plugins, section: defaults}
type: pathspec
yaml: {key: plugins.connection.path}
DEFAULT_DEBUG:
name: Debug mode
default: False
description: Toggles debug output in Ansible, VERY verbose and can hinder multiprocessing.
env: [{name: ANSIBLE_DEBUG}]
ini:
– {key: debug, section: defaults}
type: boolean
DEFAULT_EXECUTABLE:
name: Target shell executable
default: /bin/sh
description:
– “This indicates the command to use to spawn a shell under for Ansible’s execution needs on a target.
Users may need to change this in rare instances when shell usage is constrained, but in most cases it may be left as is.”
env: [{name: ANSIBLE_EXECUTABLE}]
ini:
– {key: executable, section: defaults}
DEFAULT_FACT_PATH:
name: local fact path
default: ~
description:
– “This option allows you to globally configure a custom path for ‘local_facts’ for the implied M(setup) task when using fact gathering.”
– “If not set, it will fallback to the default from the M(setup) module: “/etc/ansible/facts.d“.”
– “This does **not** affect user defined tasks that use the M(setup) module.”
env: [{name: ANSIBLE_FACT_PATH}]
ini:
– {key: fact_path, section: defaults}
type: path
yaml: {key: facts.gathering.fact_path}
DEFAULT_FILTER_PLUGIN_PATH:
name: Jinja2 Filter Plugins Path
default: ~/.ansible/plugins/filter:/usr/share/ansible/plugins/filter
description: Colon separated paths in which Ansible will search for Jinja2 Filter Plugins.
env: [{name: ANSIBLE_FILTER_PLUGINS}]
ini:
– {key: filter_plugins, section: defaults}
type: pathspec
DEFAULT_FORCE_HANDLERS:
name: Force handlers to run after failure
default: False
description:
– This option controls if notified handlers run on a host even if a failure occurs on that host.
– When false, the handlers will not run if a failure has occurred on a host.
– This can also be set per play or on the command line. See Handlers and Failure for more details.
env: [{name: ANSIBLE_FORCE_HANDLERS}]
ini:
– {key: force_handlers, section: defaults}
type: boolean
version_added: “1.9.1”
DEFAULT_FORKS:
name: Number of task forks
default: 5
description: Maximum number of forks Ansible will use to execute tasks on target hosts.
env: [{name: ANSIBLE_FORKS}]
ini:
– {key: forks, section: defaults}
type: integer
DEFAULT_GATHERING:
name: Gathering behaviour
default: ‘implicit’
description:
– This setting controls the default policy of fact gathering (facts discovered about remote systems).
– “When ‘implicit’ (the default), the cache plugin will be ignored and facts will be gathered per play unless ‘gather_facts: False’ is set.”
– “When ‘explicit’ the inverse is true, facts will not be gathered unless directly requested in the play.”
– “The ‘smart’ value means each new host that has no facts discovered will be scanned,
but if the same host is addressed in multiple plays it will not be contacted again in the playbook run.”
– “This option can be useful for those wishing to save fact gathering time. Both ‘smart’ and ‘explicit’ will use the cache plugin.”
env: [{name: ANSIBLE_GATHERING}]
ini:
– key: gathering
section: defaults
version_added: “1.6”
choices: [‘smart’, ‘explicit’, ‘implicit’]
DEFAULT_GATHER_SUBSET:
name: Gather facts subset
default: ‘all’
description:
– Set the `gather_subset` option for the M(setup) task in the implicit fact gathering.
See the module documentation for specifics.
– “It does **not** apply to user defined M(setup) tasks.”
env: [{name: ANSIBLE_GATHER_SUBSET}]
ini:
– key: gather_subset
section: defaults
version_added: “2.1”
DEFAULT_GATHER_TIMEOUT:
name: Gather facts timeout
default: 10
description:
– Set the timeout in seconds for the implicit fact gathering.
– “It does **not** apply to user defined M(setup) tasks.”
env: [{name: ANSIBLE_GATHER_TIMEOUT}]
ini:
– {key: gather_timeout, section: defaults}
type: integer
yaml: {key: defaults.gather_timeout}
DEFAULT_HANDLER_INCLUDES_STATIC:
name: Make handler M(include) static
default: False
description:
– “Since 2.0 M(include) can be ‘dynamic’, this setting (if True) forces that if the include appears in a “handlers“ section to be ‘static’.”
env: [{name: ANSIBLE_HANDLER_INCLUDES_STATIC}]
ini:
– {key: handler_includes_static, section: defaults}
type: boolean
deprecated:
why: include itself is deprecated and this setting will not matter in the future
version: “2.8”
alternatives: none as its already built into the decision between include_tasks and import_tasks
DEFAULT_HASH_BEHAVIOUR:
name: Hash merge behaviour
default: replace
type: string
choices: [“replace”, “merge”]
description:
– This setting controls how variables merge in Ansible.
By default Ansible will override variables in specific precedence orders, as described in Variables.
When a variable of higher precedence wins, it will replace the other value.
– “Some users prefer that variables that are hashes (aka ‘dictionaries’ in Python terms) are merged.
This setting is called ‘merge’. This is not the default behavior and it does not affect variables whose values are scalars
(integers, strings) or arrays. We generally recommend not using this setting unless you think you have an absolute need for it,
and playbooks in the official examples repos do not use this setting”
– In version 2.0 a “combine“ filter was added to allow doing this for a particular variable (described in Filters).
env: [{name: ANSIBLE_HASH_BEHAVIOUR}]
ini:
– {key: hash_behaviour, section: defaults}
DEFAULT_HOST_LIST:
name: Inventory Source
default: /etc/ansible/hosts
description: Colon separated list of Ansible inventory sources
env:
– name: ANSIBLE_HOSTS
deprecated:
why: The variable is misleading as it can be a list of hosts and/or paths to inventory sources
version: “2.8”
alternatives: ANSIBLE_INVENTORY
– name: ANSIBLE_INVENTORY
expand_relative_paths: True
ini:
– key: hostfile
section: defaults
deprecated:
why: The key is misleading as it can also be a list of hosts, a directory or a list of paths
version: “2.8”
alternatives: “[defaults]\ninventory=/path/to/file|dir”
– key: inventory
section: defaults
type: pathlist
yaml: {key: defaults.inventory}
DEFAULT_INTERNAL_POLL_INTERVAL:
name: Internal poll interval
default: 0.001
env: []
ini:
– {key: internal_poll_interval, section: defaults}
type: float
version_added: “2.2”
description:
– This sets the interval (in seconds) of Ansible internal processes polling each other.
Lower values improve performance with large playbooks at the expense of extra CPU load.
Higher values are more suitable for Ansible usage in automation scenarios,
when UI responsiveness is not required but CPU usage might be a concern.
– “The default corresponds to the value hardcoded in Ansible <= 2.1”
DEFAULT_INVENTORY_PLUGIN_PATH:
name: Inventory Plugins Path
default: ~/.ansible/plugins/inventory:/usr/share/ansible/plugins/inventory
description: Colon separated paths in which Ansible will search for Inventory Plugins.
env: [{name: ANSIBLE_INVENTORY_PLUGINS}]
ini:
– {key: inventory_plugins, section: defaults}
type: pathspec
DEFAULT_JINJA2_EXTENSIONS:
name: Enabled Jinja2 extensions
default: []
description:
– This is a developer-specific feature that allows enabling additional Jinja2 extensions.
– “See the Jinja2 documentation for details. If you do not know what these do, you probably don’t need to change this setting :)”
env: [{name: ANSIBLE_JINJA2_EXTENSIONS}]
ini:
– {key: jinja2_extensions, section: defaults}
DEFAULT_KEEP_REMOTE_FILES:
name: Keep remote files
default: False
description: Enables/disables the cleaning up of the temporary files Ansible used to execute the tasks on the remote.
env: [{name: ANSIBLE_KEEP_REMOTE_FILES}]
ini:
– {key: keep_remote_files, section: defaults}
type: boolean
DEFAULT_LIBVIRT_LXC_NOSECLABEL:
# TODO: move to plugin
name: No security label on Lxc
default: False
description:
– “This setting causes libvirt to connect to lxc containers by passing –noseclabel to virsh.
This is necessary when running on systems which do not have SELinux.”
env: [{name: LIBVIRT_LXC_NOSECLABEL}]
ini:
– {key: libvirt_lxc_noseclabel, section: selinux}
type: boolean
version_added: “2.1”
DEFAULT_LOAD_CALLBACK_PLUGINS:
name: Load callbacks for adhoc
default: False
description:
– Controls whether callback plugins are loaded when running /usr/bin/ansible.
This may be used to log activity from the command line, send notifications, and so on.
Callback plugins are always loaded for “ansible-playbook“.
env: [{name: ANSIBLE_LOAD_CALLBACK_PLUGINS}]
ini:
– {key: bin_ansible_callbacks, section: defaults}
type: boolean
version_added: “1.8”
DEFAULT_LOCAL_TMP:
name: Controller temporary directory
default: ~/.ansible/tmp
description: Temporary directory for Ansible to use on the controller.
env: [{name: ANSIBLE_LOCAL_TEMP}]
ini:
– {key: local_tmp, section: defaults}
type: tmppath
DEFAULT_LOG_PATH:
name: Ansible log file path
default: ”
description: File to which Ansible will log on the controller. When empty logging is disabled.
env: [{name: ANSIBLE_LOG_PATH}]
ini:
– {key: log_path, section: defaults}
type: path
DEFAULT_LOOKUP_PLUGIN_PATH:
name: Lookup Plugins Path
description: Colon separated paths in which Ansible will search for Lookup Plugins.
default: ~/.ansible/plugins/lookup:/usr/share/ansible/plugins/lookup
env: [{name: ANSIBLE_LOOKUP_PLUGINS}]
ini:
– {key: lookup_plugins, section: defaults}
type: pathspec
yaml: {key: defaults.lookup_plugins}
DEFAULT_MANAGED_STR:
name: Ansible managed
default: ‘Ansible managed’
description: Sets the macro for the ‘ansible_managed’ variable available for M(template) tasks.
env: []
ini:
– {key: ansible_managed, section: defaults}
yaml: {key: defaults.ansible_managed}
DEFAULT_MODULE_ARGS:
name: Adhoc default arguments
default: ”
description:
– This sets the default arguments to pass to the “ansible“ adhoc binary if no “-a“ is specified.
env: [{name: ANSIBLE_MODULE_ARGS}]
ini:
– {key: module_args, section: defaults}
DEFAULT_MODULE_COMPRESSION:
name: Python module compression
default: ZIP_DEFLATED
description: Compression scheme to use when transfering Python modules to the target.
env: []
ini:
– {key: module_compression, section: defaults}
# vars:
# – name: ansible_module_compression
DEFAULT_MODULE_LANG:
name: Target language environment
default: “{{CONTROLER_LANG}}”
description: “Language locale setting to use for modules when they execute on the target, if empty it defaults to ‘en_US.UTF-8′”
env: [{name: ANSIBLE_MODULE_LANG}]
ini:
– {key: module_lang, section: defaults}
# vars:
# – name: ansible_module_lang
DEFAULT_MODULE_NAME:
name: Default adhoc module
default: command
description: “Module to use with the “ansible“ AdHoc command, if none is specified via “-m“.”
env: []
ini:
– {key: module_name, section: defaults}
DEFAULT_MODULE_PATH:
name: Modules Path
description: Colon separated paths in which Ansible will search for Modules.
default: ~/.ansible/plugins/modules:/usr/share/ansible/plugins/modules
env: [{name: ANSIBLE_LIBRARY}]
ini:
– {key: library, section: defaults}
type: pathspec
DEFAULT_MODULE_SET_LOCALE:
name: Target locale
default: False
description: Controls if we set locale for modules when executing on the target.
env: [{name: ANSIBLE_MODULE_SET_LOCALE}]
ini:
– {key: module_set_locale, section: defaults}
type: boolean
# vars:
# – name: ansible_module_locale
DEFAULT_MODULE_UTILS_PATH:
name: Module Utils Path
description: Colon separated paths in which Ansible will search for Module utils files, which are shared by modules.
default: ~/.ansible/plugins/module_utils:/usr/share/ansible/plugins/module_utils
env: [{name: ANSIBLE_MODULE_UTILS}]
ini:
– {key: module_utils, section: defaults}
type: pathspec
DEFAULT_NO_LOG:
name: No log
default: False
description: “Toggle Ansible’s display and logging of task details, mainly used to avoid security disclosures.”
env: [{name: ANSIBLE_NO_LOG}]
ini:
– {key: no_log, section: defaults}
type: boolean
DEFAULT_NO_TARGET_SYSLOG:
name: No syslog on target
default: False
description: Toggle Ansbile logging to syslog on the target when it executes tasks.
env: [{name: ANSIBLE_NO_TARGET_SYSLOG}]
ini:
– {key: no_target_syslog, section: defaults}
type: boolean
yaml: {key: defaults.no_target_syslog}
DEFAULT_NULL_REPRESENTATION:
name: Represent a null
default: ~
description: What templating should return as a ‘null’ value. When not set it will let Jinja2 decide.
env: [{name: ANSIBLE_NULL_REPRESENTATION}]
ini:
– {key: null_representation, section: defaults}
type: none
DEFAULT_POLL_INTERVAL:
name: Async poll interval
default: 15
description:
– For asynchronous tasks in Ansible (covered in Asynchronous Actions and Polling),
this is how often to check back on the status of those tasks when an explicit poll interval is not supplied.
The default is a reasonably moderate 15 seconds which is a tradeoff between checking in frequently and
providing a quick turnaround when something may have completed.
env: [{name: ANSIBLE_POLL_INTERVAL}]
ini:
– {key: poll_interval, section: defaults}
type: integer
DEFAULT_PRIVATE_KEY_FILE:
name: Private key file
default: ~
description:
– Option for connections using a certificate or key file to authenticate, rather than an agent or passwords,
you can set the default value here to avoid re-specifying –private-key with every invocation.
env: [{name: ANSIBLE_PRIVATE_KEY_FILE}]
ini:
– {key: private_key_file, section: defaults}
type: path
DEFAULT_PRIVATE_ROLE_VARS:
name: Private role variables
default: False
description: ”
env: [{name: ANSIBLE_PRIVATE_ROLE_VARS}]
ini:
– {key: private_role_vars, section: defaults}
type: boolean
yaml: {key: defaults.private_role_vars}
DEFAULT_REMOTE_PORT:
name: Remote port
default: ~
description: Port to use in remote connections, when blank it will use the connection plugin default.
env: [{name: ANSIBLE_REMOTE_PORT}]
ini:
– {key: remote_port, section: defaults}
type: integer
yaml: {key: defaults.remote_port}
DEFAULT_REMOTE_TMP:
name: Target temporary directory
default: ~/.ansible/tmp
description:
– Temporary directory to use on targets when executing tasks.
– In some cases Ansible may still choose to use a system temporary dir to avoid permission issues.
env: [{name: ANSIBLE_REMOTE_TEMP}]
ini:
– {key: remote_tmp, section: defaults}
vars:
– name: ansible_remote_tmp
DEFAULT_REMOTE_USER:
name: Login/Remote User
default:
description:
– Sets the login user for the target machines
– “When blank it uses the connection plugin’s default, normally the user currently executing Ansible.”
env: [{name: ANSIBLE_REMOTE_USER}]
ini:
– {key: remote_user, section: defaults}
DEFAULT_ROLES_PATH:
name: Roles path
default: ~/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles
description: Colon separated paths in which Ansible will search for Roles.
env: [{name: ANSIBLE_ROLES_PATH}]
expand_relative_paths: True
ini:
– {key: roles_path, section: defaults}
type: pathspec
yaml: {key: defaults.roles_path}
DEFAULT_SCP_IF_SSH:
# TODO: move to ssh plugin
default: smart
description:
– “Prefered 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}
DEFAULT_SELINUX_SPECIAL_FS:
name: Problematic file systems
default: fuse, nfs, vboxsf, ramfs, 9p
description:
– “Some filesystems do not support safe operations and/or return inconsistent errors,
this setting makes Ansible ‘tolerate’ those in the list w/o causing fatal errors.”
– Data corruption may occur and writes are not always verified when a filesystem is in the list.
env: []
ini:
– {key: special_context_filesystems, section: selinux}
type: list
DEFAULT_SFTP_BATCH_MODE:
# TODO: move to ssh plugin
default: True
description: ‘TODO: write it’
env: [{name: ANSIBLE_SFTP_BATCH_MODE}]
ini:
– {key: sftp_batch_mode, section: ssh_connection}
type: boolean
yaml: {key: ssh_connection.sftp_batch_mode}
DEFAULT_SQUASH_ACTIONS:
name: Squashable actions
default: apk, apt, dnf, homebrew, openbsd_pkg, pacman, pkgng, yum, zypper
description:
– Ansible can optimise actions that call modules that support list parameters when using “with_“ looping.
Instead of calling the module once for each item, the module is called once with the full list.
– The default value for this setting is only for certain package managers, but it can be used for any module
– Currently, this is only supported for modules that have a name or pkg parameter, and only when the item is the only thing being passed to the parameter.
env: [{name: ANSIBLE_SQUASH_ACTIONS}]
ini:
– {key: squash_actions, section: defaults}
type: list
version_added: “2.0”
DEFAULT_SSH_TRANSFER_METHOD:
# TODO: move to ssh plugin
default:
description: ‘unused?’
# – “Prefered method to use when transfering files over ssh”
# – Setting to smart will try them until one succeeds or they all fail
#choices: [‘sftp’, ‘scp’, ‘dd’, ‘smart’]
env: [{name: ANSIBLE_SSH_TRANSFER_METHOD}]
ini:
– {key: transfer_method, section: ssh_connection}
DEFAULT_STDOUT_CALLBACK:
name: Main display callback plugin
default: default
description:
– “Set the main callback used to display Ansible output, you can only have one at a time.”
– You can have many other callbacks, but just one can be in charge of stdout.
env: [{name: ANSIBLE_STDOUT_CALLBACK}]
ini:
– {key: stdout_callback, section: defaults}
DEFAULT_STRATEGY:
name: Implied strategy
default: ‘linear’
description: Set the default strategy used for plays.
env: [{name: ANSIBLE_STRATEGY}]
ini:
– {key: strategy, section: defaults}
version_added: “2.3”
DEFAULT_STRATEGY_PLUGIN_PATH:
name: Strategy Plugins Path
description: Colon separated paths in which Ansible will search for Strategy Plugins.
default: ~/.ansible/plugins/strategy:/usr/share/ansible/plugins/strategy
env: [{name: ANSIBLE_STRATEGY_PLUGINS}]
ini:
– {key: strategy_plugins, section: defaults}
type: pathspec
DEFAULT_SU:
default: False
description: ‘Toggle the use of “su” for tasks.’
env: [{name: ANSIBLE_SU}]
ini:
– {key: su, section: defaults}
type: boolean
yaml: {key: defaults.su}
DEFAULT_SUDO:
default: False
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
description: ‘Toggle the use of “sudo” for tasks.’
env: [{name: ANSIBLE_SUDO}]
ini:
– {key: sudo, section: defaults}
type: boolean
DEFAULT_SUDO_EXE:
name: sudo executable
default: sudo
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
description: ‘specify an “sudo” executable, otherwise it relies on PATH.’
env: [{name: ANSIBLE_SUDO_EXE}]
ini:
– {key: sudo_exe, section: defaults}
DEFAULT_SUDO_FLAGS:
name: sudo flags
default: ‘-H -S -n’
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
description: ‘Flags to pass to “sudo”‘
env: [{name: ANSIBLE_SUDO_FLAGS}]
ini:
– {key: sudo_flags, section: defaults}
DEFAULT_SUDO_USER:
name: sudo user
default:
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
description: ‘User you become when using “sudo”, leaving it blank will use the default configured on the target (normally root)’
env: [{name: ANSIBLE_SUDO_USER}]
ini:
– {key: sudo_user, section: defaults}
DEFAULT_SU_EXE:
name: su executable
default: su
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
description: ‘specify an “su” executable, otherwise it relies on PATH.’
env: [{name: ANSIBLE_SU_EXE}]
ini:
– {key: su_exe, section: defaults}
DEFAULT_SU_FLAGS:
name: su flags
default: ”
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
description: ‘Flags to pass to su’
env: [{name: ANSIBLE_SU_FLAGS}]
ini:
– {key: su_flags, section: defaults}
DEFAULT_SU_USER:
name: su user
default:
description: ‘User you become when using “su”, leaving it blank will use the default configured on the target (normally root)’
env: [{name: ANSIBLE_SU_USER}]
ini:
– {key: su_user, section: defaults}
deprecated:
why: In favor of become which is a generic framework
version: “2.8”
alternatives: become
DEFAULT_SYSLOG_FACILITY:
name: syslog facility
default: LOG_USER
description: Syslog facility to use when Ansible logs to the remote target
env: [{name: ANSIBLE_SYSLOG_FACILITY}]
ini:
– {key: syslog_facility, section: defaults}
DEFAULT_TASK_INCLUDES_STATIC:
name: Task include static
default: False
description:
– The `include` tasks can be static or dynamic, this toggles the default expected behaviour if autodetection fails and it is not explicitly set in task.
env: [{name: ANSIBLE_TASK_INCLUDES_STATIC}]
ini:
– {key: task_includes_static, section: defaults}
type: boolean
version_added: “2.1”
deprecated:
why: include itself is deprecated and this setting will not matter in the future
version: “2.8”
alternatives: None, as its already built into the decision between include_tasks and import_tasks
DEFAULT_TEST_PLUGIN_PATH:
name: Jinja2 Test Plugins Path
description: Colon separated paths in which Ansible will search for Jinja2 Test Plugins.
default: ~/.ansible/plugins/test:/usr/share/ansible/plugins/test
env: [{name: ANSIBLE_TEST_PLUGINS}]
ini:
– {key: test_plugins, section: defaults}
type: pathspec
DEFAULT_TIMEOUT:
name: Connection timeout
default: 10
description: This is the default timeout for connection plugins to use.
env: [{name: ANSIBLE_TIMEOUT}]
ini:
– {key: timeout, section: defaults}
type: integer
DEFAULT_TRANSPORT:
name: Connection plugin
default: smart
description: “Default connection plugin to use, the ‘smart’ option will toggle between ‘ssh’ and ‘paramiko’ depending on controller OS and ssh versions”
env: [{name: ANSIBLE_TRANSPORT}]
ini:
– {key: transport, section: defaults}
DEFAULT_UNDEFINED_VAR_BEHAVIOR:
name: Jinja2 fail on undefined
default: True
version_added: “1.3”
description:
– When True, this causes ansible templating to fail steps that reference variable names that are likely typoed.
– “Otherwise, any ‘{{ template_expression }}’ that contains undefined variables will be rendered in a template or ansible action line exactly as written.”
env: [{name: ANSIBLE_ERROR_ON_UNDEFINED_VARS}]
ini:
– {key: error_on_undefined_vars, section: defaults}
type: boolean
DEFAULT_VARS_PLUGIN_PATH:
name: Vars Plugins Path
default: ~/.ansible/plugins/vars:/usr/share/ansible/plugins/vars
description: Colon separated paths in which Ansible will search for Vars Plugins.
env: [{name: ANSIBLE_VARS_PLUGINS}]
ini:
– {key: vars_plugins, section: defaults}
type: pathspec
# TODO: unused?
#DEFAULT_VAR_COMPRESSION_LEVEL:
# default: 0
# description: ‘TODO: write it’
# env: [{name: ANSIBLE_VAR_COMPRESSION_LEVEL}]
# ini:
# – {key: var_compression_level, section: defaults}
# type: integer
# yaml: {key: defaults.var_compression_level}
DEFAULT_VAULT_ID_MATCH:
name: Force vault id match
default: False
description: ‘If true, decrypting vaults with a vault id will only try the password from the matching vault-id’
env: [{name: ANSIBLE_VAULT_ID_MATCH}]
ini:
– {key: vault_id_match, section: defaults}
yaml: {key: defaults.vault_id_match}
DEFAULT_VAULT_IDENTITY:
name: Vault id label
default: default
description: ‘The label to use for the default vault id label in cases where a vault id label is not provided’
env: [{name: ANSIBLE_VAULT_IDENTITY}]
ini:
– {key: vault_identity, section: defaults}
yaml: {key: defaults.vault_identity}
DEFAULT_VAULT_IDENTITY_LIST:
name: Default vault ids
default: []
description: ‘A list of vault-ids to use by default. Equivalent to multiple –vault-id args. Vault-ids are tried in order.’
env: [{name: ANSIBLE_VAULT_IDENTITY_LIST}]
ini:
– {key: vault_identity_list, section: defaults}
type: list
yaml: {key: defaults.vault_identity_list}
DEFAULT_VAULT_PASSWORD_FILE:
name: Vault password file
default: ~
description: ‘The vault password file to use. Equivalent to –vault-password-file or –vault-id’
env: [{name: ANSIBLE_VAULT_PASSWORD_FILE}]
ini:
– {key: vault_password_file, section: defaults}
type: path
yaml: {key: defaults.vault_password_file}
DEFAULT_VERBOSITY:
name: Verbosity
default: 0
description: Sets the default verbosity, equivalent to the number of “-v“ passed in the command line.
env: [{name: ANSIBLE_VERBOSITY}]
ini:
– {key: verbosity, section: defaults}
type: integer
DEPRECATION_WARNINGS:
name: Deprecation messages
default: True
description: “Toggle to control the showing of deprecation warnings”
env: [{name: ANSIBLE_DEPRECATION_WARNINGS}]
ini:
– {key: deprecation_warnings, section: defaults}
type: boolean
DIFF_ALWAYS:
name: Show differences
default: False
description: Configuration toggle to tell modules to show differences when in ‘changed’ status, equivalent to “–diff“.
env: [{name: ANSIBLE_DIFF_ALWAYS}]
ini:
– {key: always, section: diff}
type: bool
DIFF_CONTEXT:
name: Difference context
default: 3
description: How many lines of context to show when displaying the differences between files.
env: [{name: ANSIBLE_DIFF_CONTEXT}]
ini:
– {key: context, section: diff}
type: integer
DISPLAY_ARGS_TO_STDOUT:
name: Show task arguments
default: False
description:
– “Normally “ansible-playbook“ will print a header for each task that is run.
These headers will contain the name: field from the task if you specified one.
If you didn’t then “ansible-playbook“ uses the task’s action to help you tell which task is presently running.
Sometimes you run many of the same action and so you want more information about the task to differentiate it from others of the same action.
If you set this variable to True in the config then “ansible-playbook“ will also include the task’s arguments in the header.”
– “This setting defaults to False because there is a chance that you have sensitive values in your parameters and
you do not want those to be printed.”
– “If you set this to True you should be sure that you have secured your environment’s stdout
(no one can shoulder surf your screen and you aren’t saving stdout to an insecure file) or
made sure that all of your playbooks explicitly added the “no_log: True“ parameter to tasks which have sensistive values
See How do I keep secret data in my playbook? for more information.”
env: [{name: ANSIBLE_DISPLAY_ARGS_TO_STDOUT}]
ini:
– {key: display_args_to_stdout, section: defaults}
type: boolean
version_added: “2.1”
DISPLAY_SKIPPED_HOSTS:
name: Show skipped results
default: True
description: “Toggle to control displaying skipped task/host entries in a task in the default callback”
env: [{name: DISPLAY_SKIPPED_HOSTS}]
ini:
– {key: display_skipped_hosts, section: defaults}
type: boolean
ERROR_ON_MISSING_HANDLER:
name: Missing handler error
default: True
description: “Toggle to allow missing handlers to become a warning instead of an error when notifying.”
env: [{name: ANSIBLE_ERROR_ON_MISSING_HANDLER}]
ini:
– {key: error_on_missing_handler, section: defaults}
type: boolean
GALAXY_IGNORE_CERTS:
name: Galaxy validate certs
default: False
description:
– If set to yes, ansible-galaxy will not validate TLS certificates.
This can be useful for testing against a server with a self-signed certificate.
env: [{name: ANSIBLE_GALAXY_IGNORE}]
ini:
– {key: ignore_certs, section: galaxy}
type: boolean
GALAXY_ROLE_SKELETON:
name: Galaxy skeleton direcotry
default:
description: Role skeleton directory to use as a template for the “init“ action in “ansible-galaxy“, same as “–role-skeleton“.
env: [{name: ANSIBLE_GALAXY_ROLE_SKELETON}]
ini:
– {key: role_skeleton, section: galaxy}
type: path
GALAXY_ROLE_SKELETON_IGNORE:
name: Galaxy skeleton ignore
default: [“^.git$”, “^.*/.git_keep$”]
description: patterns of files to ignore inside a galaxy role skeleton directory
env: [{name: ANSIBLE_GALAXY_ROLE_SKELETON_IGNORE}]
ini:
– {key: role_skeleton_ignore, section: galaxy}
type: list
# TODO: unused?
#GALAXY_SCMS:
# name: Galaxy SCMS
# default: git, hg
# description: Available galaxy source control management systems.
# env: [{name: ANSIBLE_GALAXY_SCMS}]
# ini:
# – {key: scms, section: galaxy}
# type: list
GALAXY_SERVER:
default: https://galaxy.ansible.com
description: “URL to prepend when roles don’t specify the full URI, assume they are referencing this server as the source.”
env: [{name: ANSIBLE_GALAXY_SERVER}]
ini:
– {key: server, section: galaxy}
yaml: {key: galaxy.server}
HOST_KEY_CHECKING:
name: Check host keys
default: True
description: ‘Set this to “False” if you want to avoid host key checking by the underlying tools Ansible uses to connect to the host’
env: [{name: ANSIBLE_HOST_KEY_CHECKING}]
ini:
– {key: host_key_checking, section: defaults}
type: boolean
INVENTORY_ENABLED:
name: Active Inventory plugins
default: [‘host_list’, ‘script’, ‘yaml’, ‘ini’]
description: List of enabled inventory plugins, it also determines the order in which they are used.
env: [{name: ANSIBLE_INVENTORY_ENABLED}]
ini:
– {key: enable_plugins, section: inventory}
type: list
INVENTORY_IGNORE_EXTS:
name: Inventory ignore extensions
default: “{{(BLACKLIST_EXTS + ( ‘~’, ‘.orig’, ‘.ini’, ‘.cfg’, ‘.retry’))}}”
description: List of extensions to ignore when using a directory as an inventory source
env: [{name: ANSIBLE_INVENTORY_IGNORE}]
ini:
– {key: inventory_ignore_extensions, section: defaults}
– {key: ignore_extensions, section: inventory}
type: list
INVENTORY_IGNORE_PATTERNS:
name: Inventory ignore patterns
default: []
description: List of patterns to ignore when using a directory as an inventory source
env: [{name: ANSIBLE_INVENTORY_IGNORE_REGEX}]
ini:
– {key: inventory_ignore_patterns, section: defaults}
– {key: ignore_patterns, section: inventory}
type: list
INVENTORY_UNPARSED_IS_FAILED:
name: Unparsed Inventory failure
default: False
description: If ‘true’ unparsed inventory sources become fatal errors, they are warnings otherwise.
env: [{name: ANSIBLE_INVENTORY_UNPARSED_FAILED}]
ini:
– {key: unparsed_is_failed, section: inventory}
type: bool
MAX_FILE_SIZE_FOR_DIFF:
name: Diff maxiumum file size
default: 104448
description: Maximum size of files to be considered for diff display
env: [{name: ANSIBLE_MAX_DIFF_SIZE}]
ini:
– {key: max_diff_size, section: defaults}
type: int
MERGE_MULTIPLE_CLI_TAGS:
name: Merge ‘tags’ options
default: True
description:
– “This allows changing how multiple –tags and –skip-tags arguments are handled on the command line.
In Ansible up to and including 2.3, specifying –tags more than once will only take the last value of –tags.”
– “Setting this config value to True will mean that all of the –tags options will be merged together. The same holds true for –skip-tags.”
env: [{name: ANSIBLE_MERGE_MULTIPLE_CLI_TAGS}]
ini:
– {key: merge_multiple_cli_tags, section: defaults}
type: bool
version_added: “2.3”
NETWORK_GROUP_MODULES:
name: Network module families
default: [eos, nxos, ios, iosxr, junos, ce, vyos, sros, dellos9, dellos10, dellos6, asa, aruba, aireos]
description: ‘TODO: write it’
env: [{name: NETWORK_GROUP_MODULES}]
ini:
– {key: network_group_modules, section: defaults}
type: list
yaml: {key: defaults.network_group_modules}
#ONLY_NAMESPACE_FACTS:
# Deffered to 2.5
# FIXME: reenable when we can remove ansible_ prefix from namespaced facts
# default: False
# description:
# – Facts normally get injected as top level variables, this setting prevents that.
# – Facts are still available in the `ansible_facts` variable w/o the `ansible_` prefix.
# env: [{name: ANSIBLE_RESTRICT_FACTS}]
# ini:
# – {key: restrict_facts_namespace, section: defaults}
# type: boolean
# yaml: {key: defaults.restrict_facts_namespace}
# version_added: “2.4”
PARAMIKO_HOST_KEY_AUTO_ADD:
# TODO: move to plugin
default: False
description: ‘TODO: write it’
env: [{name: ANSIBLE_PARAMIKO_HOST_KEY_AUTO_ADD}]
ini:
– {key: host_key_auto_add, section: paramiko_connection}
type: boolean
PARAMIKO_LOOK_FOR_KEYS:
# TODO: move to plugin
default: True
description: ‘TODO: write it’
env: [{name: ANSIBLE_PARAMIKO_LOOK_FOR_KEYS}]
ini:
– {key: look_for_keys, section: paramiko_connection}
type: boolean
PARAMIKO_PROXY_COMMAND:
# TODO: move to plugin
default:
description: ‘TODO: write it’
env: [{name: ANSIBLE_PARAMIKO_PROXY_COMMAND}]
ini:
– {key: proxy_command, section: paramiko_connection}
PARAMIKO_PTY:
# TODO: move to plugin
default: True
description: ‘TODO: write it’
env: [{name: ANSIBLE_PARAMIKO_PTY}]
ini:
– {key: pty, section: paramiko_connection}
type: boolean
PARAMIKO_RECORD_HOST_KEYS:
# TODO: move to plugin
default: True
description: ‘TODO: write it’
env: [{name: ANSIBLE_PARAMIKO_RECORD_HOST_KEYS}]
ini:
– {key: record_host_keys, section: paramiko_connection}
type: boolean
PERSISTENT_CONTROL_PATH_DIR:
name: Persistence socket path
default: ~/.ansible/pc
description: Path to socket to be used by the connection persistence system.
env: [{name: ANSIBLE_PERSISTENT_CONTROL_PATH_DIR}]
ini:
– {key: control_path_dir, section: persistent_connection}
type: path
PERSISTENT_CONNECT_TIMEOUT:
name: Persistence timeout
default: 30
description: This controls how long the persistent connection will remain idle before it is destroyed.
env: [{name: ANSIBLE_PERSISTENT_CONNECT_TIMEOUT}]
ini:
– {key: connect_timeout, section: persistent_connection}
type: integer
PERSISTENT_CONNECT_RETRY_TIMEOUT:
name: Persistence connection retry timeout
default: 15
description: This contorls the retry timeout for presistent connection to connect to the local domain socket.
env: [{name: ANSIBLE_PERSISTENT_CONNECT_RETRY_TIMEOUT}]
ini:
– {key: connect_retry_timeout, section: persistent_connection}
type: integer
PERSISTENT_COMMAND_TIMEOUT:
name: Persistence command timeout
default: 10
description: This controls the amount of time to wait for response from remote device before timing out presistent connection.
env: [{name: ANSIBLE_PERSISTENT_COMMAND_TIMEOUT}]
ini:
– {key: command_timeout, section: persistent_connection}
type: int
PLAYBOOK_VARS_ROOT:
name: playbook vars files root
default: top
version_added: “2.4.1”
description:
– This sets which playbook dirs will be used as a root to process vars plugins, which includes finding host_vars/group_vars
– The “top“ option follows the traditional behaviour of using the top playbook in the chain to find the root directory.
– The “bottom“ option follows the 2.4.0 behaviour of using the current playbook to find the root directory.
– The “all“ option examines from the first parent to the current playbook.
env: [{name: ANSIBLE_PLAYBOOK_VARS_ROOT}]
ini:
– {key: playbook_vars_root, section: defaults}
choices: [ top, bottom, all ]
RETRY_FILES_ENABLED:
name: Retry files
default: True
description: This controls whether a failed Ansible playbook should create a .retry file.
env: [{name: ANSIBLE_RETRY_FILES_ENABLED}]
ini:
– {key: retry_files_enabled, section: defaults}
type: bool
RETRY_FILES_SAVE_PATH:
name: Retry files path
default: ~
description: This sets the path in which Ansible will save .retry files when a playbook fails and retry files are enabled.
env: [{name: ANSIBLE_RETRY_FILES_SAVE_PATH}]
ini:
– {key: retry_files_save_path, section: defaults}
type: path
SHOW_CUSTOM_STATS:
name: Display custom stats
default: False
description: ‘This adds the custom stats set via the set_stats plugin to the default output’
env: [{name: ANSIBLE_SHOW_CUSTOM_STATS}]
ini:
– {key: show_custom_stats, section: defaults}
type: bool
STRING_TYPE_FILTERS:
name: Filters to preserve strings
default: [string, to_json, to_nice_json, to_yaml, ppretty, json]
description:
– “This list of filters avoids ‘type conversion’ when templating variables”
– Useful when you want to avoid conversion into lists or dictionaries for JSON strings, for example.
env: [{name: ANSIBLE_STRING_TYPE_FILTERS}]
ini:
– {key: dont_type_filters, section: jinja2}
type: list
SYSTEM_WARNINGS:
name: System warnings
default: True
description:
– Allows disabling of warnings related to potential issues on the system running ansible itself (not on the managed hosts)
– These may include warnings about 3rd party packages or other conditions that should be resolved if possible.
env: [{name: ANSIBLE_SYSTEM_WARNINGS}]
ini:
– {key: system_warnings, section: defaults}
type: boolean
USE_PERSISTENT_CONNECTIONS:
name: Persistence
default: False
description: Toggles the use of persistence for connections.
env: [{name: ANSIBLE_USE_PERSISTENT_CONNECTIONS}]
ini:
– {key: use_persistent_connections, section: defaults}
type: boolean
VARIABLE_PRECEDENCE:
name: Group variable precedence
default: [‘all_inventory’, ‘groups_inventory’, ‘all_plugins_inventory’, ‘all_plugins_play’, ‘groups_plugins_inventory’, ‘groups_plugins_play’]
description: Allows to change the group variable precedence merge order.
env: [{name: ANSIBLE_PRECEDENCE}]
ini:
– {key: precedence, section: defaults}
type: list
version_added: “2.4”
YAML_FILENAME_EXTENSIONS:
name: Valid YAML extensions
default: [“.yml”, “.yaml”, “.json”]
description:
– “Check all of these extensions when looking for ‘variable’ files which should be YAML or JSON or vaulted versions of these.”
– ‘This affects vars_files, include_vars, inventory and vars plugins among others.’
env:
– name: ANSIBLE_YAML_FILENAME_EXT
ini:
– section: defaults
key: yaml_valid_extensions
type: list

使用这些人,会变成这样。跟预想的一样。

$ ansible-playbook -i hosts echo-sd.yml

_人人人人人人人人人人_
> PLAY [localhost] <
 ̄Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^ ̄


_人人人人人人人人人人人人人_
> TASK [Gathering Facts] <
 ̄Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^ ̄

ok: [localhost]

_人人人人人人人人人人人人人_
> TASK [Display message] <
 ̄Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^ ̄

ok: [localhost] => {
    "msg": "突然の死"
}

_人人人人人人人_
> PLAY RECAP <
 ̄Y^Y^Y^Y^Y^Y^Y^ ̄

localhost                  : ok=2    changed=0    unreachable=0    failed=0

cowsay的版本感觉很奇怪,但是echo-sd版就有点…吵闹吧。输出声音很吵。
虽然最初的目标达到了,但我特别没有喜悦而感到困扰。

解释

我想解释一下与echo-sd化相关的部分。

流程处理

在 display.py 中,会将任务执行时的消息输出到屏幕上,但对于 cowsay,通常会按照以下流程去读取和执行。

    1. 读取

确定cowsay路径
排除cowsay角色

执行

输出cowsay的横幅

让我们确认每个处理过程,并将其替换为echo-sd,迈向实现 。

加载

在Ansible启动时,会加载各种模块,其中包括Display模块,然后执行init处理。

    def __init__(self, verbosity=0):

        ()

        # cowsayの実行パスを格納する変数
        self.b_cowsay = None

        # cowsayキャラクタをコンフィグから読み込む
        self.noncow = C.ANSIBLE_COW_SELECTION

        # cowsayの実行パスを決定
        self.set_cowsay_info()

        # コンフィグ設定と合わせて使用可能なcowsayキャラクタを決定
        if self.b_cowsay:
            try:
                # cowsay -lコマンドから環境上使用可能なcowsayキャラクタを取得
                cmd = subprocess.Popen([self.b_cowsay, "-l"], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
                (out, err) = cmd.communicate()
                self.cows_available = set([to_text(c) for c in out.split()])

                # 使用可能なもののうち、ホワイトリストでも指定されたキャラクタのみを抜き出す
                if C.ANSIBLE_COW_WHITELIST:
                    self.cows_available = set(C.ANSIBLE_COW_WHITELIST).intersection(self.cows_available)
            except:
                # cowsay -lコマンドが実行できないなど、何らかの例外が起きたらcowsayしないようにする
                self.b_cowsay = False

        ()

通过 ANSIBLE_COW_WHITELIST ,可以指定要使用的字符,就像这样的操作一样。
执行路径会在 set_cowsay_info() 中进行设置,就像这样子。

# 探索するcowsay実行パスのリスト
b_COW_PATHS = (
    b"/usr/bin/cowsay",
    b"/usr/games/cowsay",
    b"/usr/local/bin/cowsay",  # BSD path for cowsay
    b"/opt/local/bin/cowsay",  # MacPorts path for cowsay
)

()

    def set_cowsay_info(self):
        # ANSIBLE_NOCOWSで無効化されていなければ実行パスをセットする
        if not C.ANSIBLE_NOCOWS:

            # b_COW_PATHSに含まれるもののうち、存在するものをb_cowsayにセット
            for b_cow_path in b_COW_PATHS:
                if os.path.exists(b_cow_path):
                    self.b_cowsay = b_cow_path

当b_cowsay执行路径设置成功后,cowsay状态将变得很美妙。

另外,在base.yml中已经使用了以下三个配置变量。

    • ANSIBLE_COW_SELECTION

 

    • ANSIBLE_COW_WHITELIST

 

    ANSIBLE_NOCOWS
基于base.yml的提取ANSIBLE_COW_SELECTION:
名称:Cowsay过滤器选择
默认值:default
描述:可以选择特定的Cowsay模板来创建横幅,或者使用“random”来循环使用它们。
环境变量:[{name: ANSIBLE_COW_SELECTION}]
ini:
– {key: cow_selection, section: defaults}

ANSIBLE_COW_WHITELIST:
名称:Cowsay过滤器白名单
默认值:[‘bud-frogs’,’bunny’,’cheese’,’daemon’,’default’,’dragon’,’elephant-in-snake’,’elephant’,’eyes’,’hellokitty’,’kitty’,’luke-koala’,’meow’,’milk’,’moofasa’,’moose’,’ren’,’sheep’,’small’,’stegosaurus’,’stimpy’,’supermilker’,’three-eyes’,’turkey’,’turtle’,’tux’,’udder’,’vader-koala’,’vader’,’www’]
描述:Cowsay模板的白名单,设置为空列表则启用所有已安装的模板。
环境变量:[{name: ANSIBLE_COW_WHITELIST}]
ini:
– {key: cow_whitelist, section: defaults}
类型:列表
yaml:{key: display.cowsay_whitelist}

ANSIBLE_NOCOWS:
名称:禁止Cowsay输出
默认值:False
描述:如果你安装了Cowsay但不想使用“牛”(为什么?),请使用此选项。
环境变量:[{name: ANSIBLE_NOCOWS}]
ini:
– {key: nocows, section: defaults}
类型:布尔
yaml:{key: display.i_am_no_fun}

执行

根据读取的cowsay路径,使用banner在屏幕上输出横幅。

    def banner(self, msg, color=None, cows=True):
        '''
        Prints a header-looking line with cowsay or stars wit hlength depending on terminal width (3 minimum)
        '''
        # cowsayの実行パスが指定されており、明示的に実行しないよう(cows=False)に
        # されていなければbanner_cowsayを利用する
        if self.b_cowsay and cows:
            try:
                # cowsayでバナー出力したらバナー処理が終了する
                self.banner_cowsay(msg)
                return
            except OSError:
                # 何かあったらメッセージを出して通常バナーで処理を続行
                self.warning("somebody cleverly deleted cowsay or something during the PB run.  heh.")

        # ここから通常バナー処理
        msg = msg.strip()
        star_len = self.columns - len(msg)
        if star_len <= 3:
            star_len = 3
        stars = u"*" * star_len
        self.display(u"\n%s %s" % (msg, stars), color=color)

我明白了,你的意思是,与常规的横幅处理不同,你是通过cowsay实现了横幅处理中断的方式对其进行处理的。
如果中断的处理成功,就在那里返回,这样就可以阻止常规横幅的显示,同时在发生了一些错误时,仍然可以显示常规横幅。

最后让我们来看看最重要的 banner_cowsay。

    def banner_cowsay(self, msg, color=None):
        # メッセージ中にある "[" "]" のセットを削除する
        if u": [" in msg:
            msg = msg.replace(u"[", u"")
            if msg.endswith(u"]"):
                msg = msg[:-1]

        # 実行するcowsayコマンドを組み立て
        runcmd = [self.b_cowsay, b"-W", b"60"]

        # cowsayキャラクタを選択
        # randomの場合はcows_availableからランダムに選ぶ
        if self.noncow:
            thecow = self.noncow
            if thecow == 'random':
                thecow = random.choice(list(self.cows_available))
            runcmd.append(b'-f')
            runcmd.append(to_bytes(thecow))

        # メッセージ本文をコマンドに追加して実行
        runcmd.append(to_bytes(msg))
        cmd = subprocess.Popen(runcmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        (out, err) = cmd.communicate()

        # displayメソッドでcowsayコマンドから受け取った出力を画面へ出力
        self.display(u"%s\n" % to_text(out), color=color)

嗯,这个地方本身并不太有趣。
一开始删除方括号的部分一眼看上去没什么意义,但冷静地阅读之后发现其实只是一个无关紧要的处理而已。

以一种类似的感觉,可以获得cowsay版本的输出。

读取(回声-SD版本)

读取部分已经稳定下来了。
由于echo-sd的输出样式不像cowsay那样丰富,因此与cows_available对应的部分直接改成了b_ECHO_SD_STYLES。

# echo-sd実行パスのリスト
b_ECHO_SD_PATHS = (
b"/usr/local/bin/echo-sd", # path for echo-sd
)

# echo-sdの出力スタイル一覧
b_ECHO_SD_STYLES = (
b"vertical",
b"tanzaku",
b"default",
)

class Display:

    def __init__(self, verbosity=0):

        ()

        # echo-sd実行パス
        self.b_echo_sd = None

        # echo-sdの出力スタイルをコンフィグから読み込む
        self.nonsd = C.ANSIBLE_SD_SELECTION

        # echo-sdの実行パスを決定
        self.set_echo_sd_info()

        ()

    def set_echo_sd_info(self):
        if not C.ANSIBLE_NOSD:
            for b_echo_sd_path in b_ECHO_SD_PATHS:
                if os.path.exists(b_echo_sd_path):
                    self.b_echo_sd = b_echo_sd_path

()

如果你看了代码,就会明白配置变量是什么。 (If you read the code, you will understand what the configuration variables are.)

ANSIBLE_SD_SELECTION

echo-sdの出力スタイルを指定
randomで「通常モード(default)」「縦書きモード(vertical)」「短冊モード(tanzaku)」から選ばれる

ANSIBLE_NOSD

Trueにするとecho-sdによるバナー出力が抑制される
デフォルトではFalseなのでサーバ上にecho-sdがインストールされていればecho-sdスタイルで動く

会使用两个。

现在已经准备好执行 echo-sd 了。

执行(回声-sd版)

这个地方就是这样。处理方式保持不变,只是改变了调用的方法名。

    def banner(self, msg, color=None, sd=True):
        '''
        Prints a header-looking line with echo-sd or stars wit hlength depending on terminal width (3 minimum)
        '''
        if self.b_echo_sd and sd:
            try:
                self.banner_echo_sd(msg)
                return
            except OSError:
                self.warning("somebody cleverly deleted echo-sd or something during the PB run.  heh.")

        ()

具体处理如下。基本流程保持不变,但进行了一些微调。

    def banner_echo_sd(self, msg, color=None):
        # メッセージ中にある "[" "]" を削除する
        if u": [" in msg:
            msg = msg.replace(u"[", u"")
            if msg.endswith(u"]"):
                msg = msg[:-1]

        # 実行するecho-sdコマンドを組み立て
        runcmd = [self.b_echo_sd]

        # echo-sdの出力スタイルを選択
        if self.nonsd:
            thesd = self.nonsd
            if thesd == 'random':
                thesd = random.choice(list(b_ECHO_SD_STYLES))

            # default以外だったらオプションを追加
            if thesd != 'default':
                runcmd.append(to_bytes("--" + thesd))

                # default以外のスタイルではメッセージに
                # "[" "]" が入っているとなぜか出力がおかしくなるので削除
                msg = msg.replace(u"[", u"")
                msg = msg.replace(u"]", u"")

        # メッセージ本文をコマンドに追加して実行
        runcmd.append(to_bytes(msg))
        cmd = subprocess.Popen(runcmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        (out, err) = cmd.communicate()

        # displayメソッドでcowsayコマンドから受け取った出力を画面へ出力
        # 表示がきつくなるので1行分改行してはじめる
        print()
        self.display(u"%s\n" % to_text(out), color=color)

在中文中,这个句子的翻译可以是:
我不太明白的是,“当消息正文包含 [ ] 时,为什么输出结果会变得怪异”这一点。
如果不进行这个删除操作,

_人人_
> PLAY [localhost]        <
> LAY [localhost]       <
> AY [localhost]       <
> Y [localhost]      <
> [localhost]      <
> ? <
> l <
> o <
> c <
> a <
> l <
> h <
> o <
> s <
> t <
> ? <
 ̄Y^Y^ ̄

最初我以为是Python解析消息正文时出了问题,但实际上在直接使用echo-sd测试后感觉像是问号奇怪的。

# コマンドで直接やってもおかしい
$ echo-sd --vertical "TASK [Display message]"
_人人_
> TASK [Display message]           <
> ASK [Display message]          <
> SK [Display message]          <
> K [Display message]         <
> [Display message]         <
> ? <
> D <
> i <
> s <
> p <
> l <
> a <
> y <
>  <
> m <
> e <
> s <
> s <
> a <
> g <
> e <
> ? <
 ̄Y^Y^ ̄

# "[" "]" を除去するとちゃんと出る
$ echo-sd --vertical "TASK Display message"
_人人_
> T <
> A <
> S <
> K <
>  <
> D <
> i <
> s <
> p <
> l <
> a <
> y <
>  <
> m <
> e <
> s <
> s <
> a <
> g <
> e <
 ̄Y^Y^ ̄

有时,为了在除默认选项以外的情况下输出,我会从消息正文中删除方括号[]。
在echo-sd中,当以纵向写作方式输出时,为了进行格式对齐,似乎将字母转换为全角字符,但如果有方括号[]的话,正则表达式或其他内容可能会出错吧?
我认为如果你看源代码的话应该能明白,但我目前已经得到了问题的解决,所以没有进一步深究。

示例执行

如此一来,就完成了这样的东西。如果还加上纵向书写的话,更加烦人得无法忍受呢。

$ export ANSIBLE_SD_SELECTION=random
$ ansible-playbook -i hosts echo-sd.yml

_人人人人人人人人人人_
> PLAY [localhost] <
 ̄Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^ ̄


_人人人人人人人人人人人人人_
> TASK [Gathering Facts] <
 ̄Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^Y^ ̄

ok: [localhost]

┏-┷-┓
┃ T ┃
┃ A ┃
┃ S ┃
┃ K ┃
┃  ┃
┃ D ┃
┃ i ┃
┃ s ┃
┃ p ┃
┃ l ┃
┃ a ┃
┃ y ┃
┃  ┃
┃ m ┃
┃ e ┃
┃ s ┃
┃ s ┃
┃ a ┃
┃ g ┃
┃ e ┃
┗━━┛

ok: [localhost] => {
    "msg": "突然の死"
}

_人人_
> P <
> L <
> A <
> Y <
>  <
> R <
> E <
> C <
> A <
> P <
 ̄Y^Y^ ̄

localhost                  : ok=2    changed=0    unreachable=0    failed=0

喜闻乐见。

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