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Set documentation the "right" way

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Jorge Gallegos 2025-09-04 14:29:08 -07:00
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plugins/connection/iap.py
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@ -1,7 +1,490 @@
# Copyright (c) 2025 Red Hat
# GNU General Public License v3.0+ https://www.gnu.org/licenses/gpl-3.0.txt
from __future__ import absolute_import, annotations
# I had to duplicate (almost?) all of the documentation found in the
# ansible.plugins.connection.ssh plugin, due to how ansible-doc and ansible-test sanity
# work, they look at the lexical structure of the code. I had initially done:
# 1. load ssh.py DOCUMENTATION string into a yaml object
# 2. modify the yaml object to change defaults / add my options
# 3. set this plugin's DOCUMENTATION to the yaml.dump() of the modified object
# but that doesn't work with how the AST evaluation is done.
# here are the changes from upstream:
# 1. Changed default private_key_file default to ~/.ssh/google_compute_engine
# 2. Make host_key_checking default to False
# 3. Added known_hosts_file option pointing to ~/.ssh/google_compute_known_hosts
DOCUMENTATION = """
name: gcloud-iap
short_description: connect via SSH through Google Cloud's Identity Aware Proxy (IAP)
description:
- This connection plugin behaves almost like the stock SSH plugin, but it creates
a new IAP process per host in the inventory so connections are tunneled through
it.
author: Jorge A Gallegos (jgallego@redhat.com)
notes:
- This plugin requires you to have configured gcloud authentication prior to using
it. You can change the active configuration used, but the plugin won't auth
for you.
- This plugin is mostly a wrapper to the ``ssh`` CLI utility and the exact behavior
of the options depends on this tool. This means that the documentation provided
here is subject to be overridden by the CLI tool itself.
- Many options default to V(None) here but that only means we do not 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).
- The ssh CLI tool uses return code 255 as a 'connection error', this can conflict
with commands/tools that also return 255 as an error code and will look like an
'unreachable' condition or 'connection error' to this plugin.
extends_documentation_fragment:
- connection_pipelining
options:
gcloud_executable:
description:
- Path to the gcloud executable, defaults to whatever is found in the PATH
environment variable.
type: string
vars:
- name: ansible_gcloud_executable
ini:
- section: gcloud
key: executable
gcloud_configuration:
description:
- If set, points to non-standard gcloud configuration.
type: string
vars:
- name: ansible_gcloud_configuration
ini:
- section: gcloud
key: configuration
env:
- name: CLOUDSDK_ACTIVE_CONFIG_NAME
gcloud_project:
description:
- The Google Cloud project ID to use for this invocation.
- If omitted, then the current active project is assumed.
type: string
vars:
- name: ansible_gcloud_project
ini:
- section: gcloud
key: project
env:
- name: CLOUDSDK_CORE_PROJECT
gcloud_account:
description:
- Google cloud account to use for invocation.
type: string
vars:
- name: ansible_gcloud_account
ini:
- section: gcloud
key: account
env:
- name: CLOUDSDK_CORE_ACCOUNT
gcloud_zone:
description:
- The Google Cloud zone to use for the instance(s).
type: string
vars:
- name: ansible_gcloud_zone
ini:
- section: gcloud
key: zone
env:
- name: CLOUDSDK_COMPUTE_ZONE
gcloud_access_token_file:
description:
- A file to read the access token from.
- The credentials of the active account (if exists) will be ignored.
type: string
vars:
- name: ansible_access_token_file
ini:
- section: gcloud
key: access_token_file
env:
- name: CLOUDSDK_AUTH_ACCESS_TOKEN_FILE
host:
description: Google Cloud instance name to connect to.
default: inventory_hostname
type: string
vars:
- name: inventory_hostname
- name: ansible_host
- name: ansible_gcloud_host
known_hosts_file:
description: Path to the UserKnownHosts file storing SSH fingerprints. Defaults
to the same file used by `gcloud compute ssh`
type: string
default: ~/.ssh/google_compute_known_hosts
ini:
- section: ssh_connection
key: known_hosts_file
vars:
- name: ansible_known_hosts_file
- name: ansible_ssh_known_hosts_file
host_key_checking:
description: Determines if SSH should reject or not a connection after checking
host keys.
default: false
type: boolean
ini:
- section: defaults
key: host_key_checking
- section: ssh_connection
key: host_key_checking
env:
- name: ANSIBLE_HOST_KEY_CHECKING
- name: ANSIBLE_SSH_HOST_KEY_CHECKING
vars:
- name: ansible_host_key_checking
- name: ansible_ssh_host_key_checking
password:
description:
- Authentication password for the O(remote_user). Can be supplied as CLI option.
type: string
vars:
- name: ansible_password
- name: ansible_ssh_pass
- name: ansible_ssh_password
password_mechanism:
description: Mechanism to use for handling ssh password prompt
type: string
default: ssh_askpass
choices:
- ssh_askpass
- sshpass
- disable
env:
- name: ANSIBLE_SSH_PASSWORD_MECHANISM
ini:
- section: ssh_connection
key: password_mechanism
vars:
- name: ansible_ssh_password_mechanism
sshpass_prompt:
description:
- Password prompt that C(sshpass)/C(SSH_ASKPASS) should search for.
- Supported by sshpass 1.06 and up when O(password_mechanism) set to V(sshpass).
- Defaults to C(Enter PIN for) when pkcs11_provider is set.
- Defaults to C(assword) when O(password_mechanism) set to V(ssh_askpass).
default: ''
type: string
ini:
- section: ssh_connection
key: 'sshpass_prompt'
env:
- name: ANSIBLE_SSHPASS_PROMPT
vars:
- name: ansible_sshpass_prompt
ssh_args:
description: arguments to pass to all ssh cli tools.
type: string
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
ssh_common_args:
description: common extra args for all ssh cli tools.
type: string
default: ''
ini:
- section: ssh_connection
key: ssh_common_args
env:
- name: ANSIBLE_SSH_COMMON_ARGS
vars:
- name: ansible_ssh_common_args
cli:
- name: ssh_common_args
ssh_executable:
description:
- This defines the location of the SSH binary. It defaults to V(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.
type: string
default: ssh
ini:
- key: ssh_executable
section: ssh_connection
env:
- name: ANSIBLE_SSH_EXECUTABLE
vars:
- name: ansible_ssh_executable
sftp_executable:
description:
- This defines the location of the sftp binary. It defaults to V(sftp) which
will use the first binary available in $PATH.
type: string
default: sftp
ini:
- key: sftp_executable
section: ssh_connection
env:
- name: ANSIBLE_SFTP_EXECUTABLE
vars:
- name: ansible_sftp_executable
scp_executable:
description:
- This defines the location of the scp binary. It defaults to V(scp) which will
use the first binary available in $PATH.
type: string
default: scp
ini:
- section: ssh_connection
key: scp_executable
env:
- name: ANSIBLE_SCP_EXECUTABLE
vars:
- name: ansible_scp_executable
scp_extra_args:
description: Extra exclusive to the C(scp) CLI
type: string
default: ''
ini:
- section: ssh_connection
key: scp_extra_args
env:
- name: ANSIBLE_SCP_EXTRA_ARGS
vars:
- name: ansible_scp_extra_args
cli:
- name: scp_extra_args
sftp_extra_args:
description: Extra exclusive to the C(sftp) CLI
type: string
default: ''
ini:
- section: ssh_connection
key: sftp_extra_args
vars:
- name: ansible_sftp_extra_args
env:
- name: ANSIBLE_SFTP_EXTRA_ARGS
cli:
- name: sftp_extra_args
ssh_extra_args:
description: Extra exclusive to the SSH CLI.
type: string
default: ''
vars:
- name: ansible_ssh_extra_args
env:
- name: ANSIBLE_SSH_EXTRA_ARGS
ini:
- section: ssh_connection
key: ssh_extra_args
cli:
- name: ssh_extra_args
reconnection_retries:
description:
- Number of attempts to connect.
- Ansible retries connections only if it gets an SSH error with a return code
of 255.
- Any errors with return codes other than 255 indicate an issue with program
execution.
type: integer
default: 0
env:
- name: ANSIBLE_SSH_RETRIES
ini:
- section: connection
key: retries
- section: ssh_connection
key: retries
vars:
- name: ansible_ssh_retries
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
keyword:
- name: 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.
type: string
ini:
- section: defaults
key: remote_user
env:
- name: ANSIBLE_REMOTE_USER
vars:
- name: ansible_user
- name: ansible_ssh_user
cli:
- name: user
keyword:
- name: remote_user
private_key_file:
description:
- Path to private key file to use for authentication.
type: string
default: '~/.ssh/google_compute_engine'
ini:
- section: defaults
key: private_key_file
- section: gcloud
key: private_key_file
env:
- name: ANSIBLE_PRIVATE_KEY_FILE
vars:
- name: ansible_private_key_file
- name: ansible_ssh_private_key_file
- name: ansible_gcloud_private_key_file
cli:
- name: private_key_file
option: '--private-key'
private_key:
description:
- Private key contents in PEM format. Requires the C(SSH_AGENT) configuration
to be enabled.
type: string
env:
- name: ANSIBLE_PRIVATE_KEY
vars:
- name: ansible_private_key
- name: ansible_ssh_private_key
private_key_passphrase:
description:
- Private key passphrase, dependent on O(private_key).
- This does NOT have any effect when used with O(private_key_file).
type: string
env:
- name: ANSIBLE_PRIVATE_KEY_PASSPHRASE
vars:
- name: ansible_private_key_passphrase
- name: ansible_ssh_private_key_passphrase
control_path:
description:
- This is the location to save SSH's ControlPath sockets, it uses SSH's variable
substitution.
- Be aware that this setting is ignored if C(-o ControlPath) is set in ssh args.
type: string
env:
- name: ANSIBLE_SSH_CONTROL_PATH
ini:
- section: ssh_connection
key: control_path
vars:
- name: ansible_control_path
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.
type: string
env:
- name: ANSIBLE_SSH_CONTROL_PATH_DIR
ini:
- section: ssh_connection
key: control_path_dir
vars:
- name: ansible_control_path_dir
sftp_batch_mode:
description:
- When set to C(True), sftp will be run in batch mode, allowing detection of
transfer errors.
- When set to C(False), sftp will not be run in batch mode, preventing detection
of transfer errors.
type: bool
default: true
env:
- name: ANSIBLE_SFTP_BATCH_MODE
ini:
- section: ssh_connection
key: sftp_batch_mode
vars:
- name: ansible_sftp_batch_mode
ssh_transfer_method:
description: Preferred method to use when transferring files over ssh
type: string
default: smart
choices:
sftp: This is the most reliable way to copy things with SSH.
scp: Deprecated in OpenSSH. For OpenSSH >=9.0 you must add an additional option
to enable scp C(scp_extra_args="-O").
piped: Creates an SSH pipe with C(dd) on either side to copy the data.
smart: Tries each method in order (sftp > scp > piped), until one succeeds or
they all fail.
env:
- name: ANSIBLE_SSH_TRANSFER_METHOD
ini:
- section: ssh_connection
key: transfer_method
vars:
- name: ansible_ssh_transfer_method
use_tty:
description: add -tt to ssh commands to force tty allocation.
type: bool
default: true
env:
- name: ANSIBLE_SSH_USETTY
ini:
- section: ssh_connection
key: usetty
vars:
- name: ansible_ssh_use_tty
timeout:
description:
- This is the default amount 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).
type: integer
default: 10
env:
- name: ANSIBLE_TIMEOUT
- name: ANSIBLE_SSH_TIMEOUT
ini:
- section: defaults
key: timeout
- section: ssh_connection
key: timeout
vars:
- name: ansible_ssh_timeout
cli:
- name: timeout
pkcs11_provider:
description:
- PKCS11 SmartCard provider such as opensc, e.g. /usr/local/lib/opensc-pkcs11.so
type: string
default: ''
env:
- name: ANSIBLE_PKCS11_PROVIDER
ini:
- section: ssh_connection
key: pkcs11_provider
vars:
- name: ansible_ssh_pkcs11_provider
verbosity:
description:
- Requested verbosity level for the SSH CLI.
default: 0
type: int
env:
- name: ANSIBLE_SSH_VERBOSITY
ini:
- section: ssh_connection
key: verbosity
vars:
- name: ansible_ssh_verbosity
"""
import os
import os.path as ospath
@ -13,7 +496,6 @@ import shutil
import subprocess
import threading
import time
import yaml
import tempfile
import typing as T
@ -21,81 +503,6 @@ import ansible.plugins.connection.ssh as sshconn
import ansible.errors as errors
import ansible.utils.display as display
_my_opts = {
"gcloud_executable": {
"description": [
"Path to the gcloud executable, defaults to whatever is found in",
"the PATH environment variable",
],
"type": "string",
"vars": [{"name": "ansible_gcloud_executable"}],
"ini": [
{"section": "gcloud", "key": "executable"},
],
},
"gcloud_configuration": {
"description": ["Path to the gcloud configuration file if non default"],
"type": "string",
"vars": [{"name": "ansible_gcloud_configuration"}],
"ini": [{"section": "gcloud", "key": "configuration"}],
"env": [{"name": "CLOUDSDK_ACTIVE_CONFIG_NAME"}],
},
"gcloud_project": {
"description": [
"The Google Cloud project ID to use for this invocation.",
"If omitted, then the current project is assumed",
],
"type": "string",
"vars": [{"name": "ansible_gcloud_project"}],
"ini": [{"section": "gcloud", "key": "project"}],
"env": [{"name": "CLOUDSDK_CORE_PROJECT"}],
},
"gcloud_account": {
"description": ["Google cloud account to use for invocation"],
"type": "string",
"vars": [{"name": "ansible_gcloud_account"}],
"ini": [{"section": "gcloud", "key": "account"}],
"env": [{"name": "CLOUDSDK_CORE_ACCOUNT"}],
},
"gcloud_zone": {
"description": ["The Google Cloud zone to use for the instance(s)"],
"type": "string",
"vars": [{"name": "ansible_gcloud_zone"}],
"ini": [{"section": "gcloud", "key": "zone"}],
"env": [{"name": "CLOUDSDK_COMPUTE_ZONE"}],
},
"gcloud_access_token_file": {
"description": [
"A file to read the access token from. ",
"The credentials of the active account (if exists) will be ignored.",
],
"type": "string",
"vars": [{"name": "ansible_access_token_file"}],
"ini": [{"section": "gcloud", "key": "access_token_file"}],
"env": [{"name": "CLOUDSDK_AUTH_ACCESS_TOKEN_FILE"}],
},
}
# piggy back on top of upstream SSH plugin's docs, this somehow breaks ansible-doc but
# it still works for other ansible commands. This is expensive but I don't want to
# duplicate the entire doc string from ssh.py
_doc = yaml.safe_load(sshconn.DOCUMENTATION)
_doc["name"] = "gcloud-iap"
_doc["short_description"] = "connect using Google Cloud's Identity Aware Proxy (IAP)"
_doc["description"] = [
"This connection plugin behaves almost like the stock SSH plugin, ",
"but it creates a new IAP process per host in the inventory so connections ",
"are tunneled through it. ",
"This plugin requires you to have set authentication prior to using it.",
]
_doc["author"] = "Jorge A Gallegos (@kad)"
# Add custom opts for this plugin
_doc["options"].update(_my_opts)
# Change default to stock SSH key used by gcloud
_doc["options"]["private_key_file"]["default"] = "~/.ssh/google_compute_engine"
DOCUMENTATION = yaml.dump(_doc)
D = display.Display()
DEFAULT_GCLOUD: T.Optional[str] = shutil.which("gcloud")
DEFAULT_SSH_PORT: int = 22
@ -275,14 +682,6 @@ class Connection(sshconn.Connection):
"no executable defined in ansible config"
)
# have to trick SSH to connect to localhost instead of the instances
fd, self.ssh_config = tempfile.mkstemp(
suffix="ssh_config", prefix="ansible_gcloud", text=True
)
with open(fd, "w") as fp:
fp.write("Host *\n")
fp.write(" HostName localhost\n")
def _connect(self) -> Connection:
"""Upstream ssh is empty, overload with the stuff starting the IAP tunnel"""
@ -330,9 +729,22 @@ class Connection(sshconn.Connection):
# override port with the random IAP port
self.set_option("port", self.iaps[host].local_port)
# disable host_key_checking because it's impossible to know ports beforehand
self.set_option("host_key_checking", False)
# prepend our generated tiny ssh config to all ssh_args if not already present
# read path to the supplied known hosts file
ukhf: str = ospath.abspath(
ospath.expanduser(str(self.get_option("known_hosts_file")))
)
# have to trick SSH to connect to localhost instead of the instances
fd, self.ssh_config = tempfile.mkstemp(
suffix="ssh_config", prefix="ansible_gcloud", text=True
)
with open(fd, "w") as fp:
fp.write("Host *\n")
fp.write(" HostName localhost\n") # trick
fp.write(" HostKeyAlias {}\n".format(host)) # avoid multiple entries
fp.write(" UserKnownHostsFile {}\n".format(ukhf)) # as defined in opts
# prepend our generated ssh config to all ssh_args if not already present
if self.ssh_config not in str(self.get_option("ssh_args")):
self.set_option(
"ssh_args", f"-F {self.ssh_config} " + str(self.get_option("ssh_args"))