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"""ansible enables running on first boot either ansible-pull"""
import abc
import os
import re
import sys
from copy import deepcopy
from logging import Logger, getLogger
from textwrap import dedent
from typing import Optional
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema, get_meta_doc
from cloudinit.distros import ALL_DISTROS, Distro
from cloudinit.settings import PER_INSTANCE
from cloudinit.subp import subp, which
from cloudinit.util import Version, get_cfg_by_path
meta: MetaSchema = {
"id": "cc_ansible",
"name": "Ansible",
"title": "Configure ansible for instance",
"frequency": PER_INSTANCE,
"distros": [ALL_DISTROS],
"activate_by_schema_keys": ["ansible"],
"description": dedent(
"""\
This module provides ``ansible`` integration for
augmenting cloud-init's configuration of the local
node.
This module installs ansible during boot and
then uses ``ansible-pull`` to run the playbook
repository at the remote URL.
"""
),
"examples": [
dedent(
"""\
ansible:
install_method: distro
pull:
url: "https://github.com/holmanb/vmboot.git"
playbook_name: ubuntu.yml
"""
),
dedent(
"""\
ansible:
package_name: ansible-core
install_method: pip
pull:
url: "https://github.com/holmanb/vmboot.git"
playbook_name: ubuntu.yml
"""
),
],
}
__doc__ = get_meta_doc(meta)
LOG = getLogger(__name__)
CFG_OVERRIDE = "ansible_config"
class AnsiblePull(abc.ABC):
def __init__(self, distro: Distro):
self.cmd_pull = ["ansible-pull"]
self.cmd_version = ["ansible-pull", "--version"]
self.distro = distro
self.env = os.environ
self.run_user: Optional[str] = None
# some ansible modules directly reference os.environ["HOME"]
# and cloud-init might not have that set, default: /root
self.env["HOME"] = self.env.get("HOME", "/root")
def get_version(self) -> Optional[Version]:
stdout, _ = self.do_as(self.cmd_version)
first_line = stdout.splitlines().pop(0)
matches = re.search(r"([\d\.]+)", first_line)
if matches:
version = matches.group(0)
return Version.from_str(version)
return None
def pull(self, *args) -> str:
stdout, _ = self.do_as([*self.cmd_pull, *args])
return stdout
def check_deps(self):
if not self.is_installed():
raise ValueError("command: ansible is not installed")
def do_as(self, command: list, **kwargs):
if not self.run_user:
return self.subp(command, **kwargs)
return self.distro.do_as(command, self.run_user, **kwargs)
def subp(self, command, **kwargs):
return subp(command, env=self.env, **kwargs)
@abc.abstractmethod
def is_installed(self):
pass
@abc.abstractmethod
def install(self, pkg_name: str):
pass
class AnsiblePullPip(AnsiblePull):
def __init__(self, distro: Distro, user: Optional[str]):
super().__init__(distro)
self.run_user = user
# Add pip install site to PATH
user_base, _ = self.do_as(
[sys.executable, "-c", "'import site; print(site.getuserbase())'"]
)
ansible_path = f"{user_base}/bin/"
old_path = self.env.get("PATH")
if old_path:
self.env["PATH"] = ":".join([old_path, ansible_path])
else:
self.env["PATH"] = ansible_path
def install(self, pkg_name: str):
"""should cloud-init grow an interface for non-distro package
managers? this seems reusable
"""
if not self.is_installed():
# bootstrap pip if required
try:
import pip # noqa: F401
except ImportError:
self.distro.install_packages(self.distro.pip_package_name)
cmd = [sys.executable, "-m", "pip", "install"]
if self.run_user:
cmd.append("--user")
self.do_as([*cmd, "--upgrade", "pip"])
self.do_as([*cmd, pkg_name])
def is_installed(self) -> bool:
stdout, _ = self.do_as([sys.executable, "-m", "pip", "list"])
return "ansible" in stdout
class AnsiblePullDistro(AnsiblePull):
def install(self, pkg_name: str):
if not self.is_installed():
self.distro.install_packages(pkg_name)
def is_installed(self) -> bool:
return bool(which("ansible"))
def handle(
name: str, cfg: Config, cloud: Cloud, log: Logger, args: list
) -> None:
ansible_cfg: dict = cfg.get("ansible", {})
ansible_user = ansible_cfg.get("run_user")
install_method = ansible_cfg.get("install_method")
setup_controller = ansible_cfg.get("setup_controller")
galaxy_cfg = ansible_cfg.get("galaxy")
pull_cfg = ansible_cfg.get("pull")
package_name = ansible_cfg.get("package_name", "")
if ansible_cfg:
ansible: AnsiblePull
validate_config(ansible_cfg)
distro: Distro = cloud.distro
if install_method == "pip":
ansible = AnsiblePullPip(distro, ansible_user)
else:
ansible = AnsiblePullDistro(distro)
ansible.install(package_name)
ansible.check_deps()
ansible_config = ansible_cfg.get("ansible_config", "")
if ansible_config:
ansible.env[CFG_OVERRIDE] = ansible_config
if galaxy_cfg:
ansible_galaxy(galaxy_cfg, ansible)
if pull_cfg:
run_ansible_pull(ansible, deepcopy(pull_cfg))
if setup_controller:
ansible_controller(setup_controller, ansible)
def validate_config(cfg: dict):
required_keys = (
"install_method",
"package_name",
)
for key in required_keys:
if not get_cfg_by_path(cfg, key):
raise ValueError(f"Missing required key '{key}' from {cfg}")
if cfg.get("pull"):
for key in "pull/url", "pull/playbook_name":
if not get_cfg_by_path(cfg, key):
raise ValueError(f"Missing required key '{key}' from {cfg}")
controller_cfg = cfg.get("setup_controller")
if controller_cfg:
if not any(
[
controller_cfg.get("repositories"),
controller_cfg.get("run_ansible"),
]
):
raise ValueError(f"Missing required key from {controller_cfg}")
install = cfg["install_method"]
if install not in ("pip", "distro"):
raise ValueError("Invalid install method {install}")
def filter_args(cfg: dict) -> dict:
"""remove boolean false values"""
return {
key.replace("_", "-"): value
for (key, value) in cfg.items()
if value is not False
}
def run_ansible_pull(pull: AnsiblePull, cfg: dict):
playbook_name: str = cfg.pop("playbook_name")
v = pull.get_version()
if not v:
LOG.warning("Cannot parse ansible version")
elif v < Version(2, 7, 0):
# diff was added in commit edaa0b52450ade9b86b5f63097ce18ebb147f46f
if cfg.get("diff"):
raise ValueError(
f"Ansible version {v.major}.{v.minor}.{v.patch}"
"doesn't support --diff flag, exiting."
)
stdout = pull.pull(
*[
f"--{key}={value}" if value is not True else f"--{key}"
for key, value in filter_args(cfg).items()
],
playbook_name,
)
if stdout:
sys.stdout.write(f"{stdout}")
def ansible_galaxy(cfg: dict, ansible: AnsiblePull):
actions = cfg.get("actions", [])
if not actions:
LOG.warning("Invalid config: %s", cfg)
for command in actions:
ansible.do_as(command)
def ansible_controller(cfg: dict, ansible: AnsiblePull):
for repository in cfg.get("repositories", []):
ansible.do_as(
["git", "clone", repository["source"], repository["path"]]
)
for args in cfg.get("run_ansible", []):
playbook_dir = args.pop("playbook_dir")
playbook_name = args.pop("playbook_name")
command = [
"ansible-playbook",
playbook_name,
*[f"--{key}={value}" for key, value in filter_args(args).items()],
]
ansible.do_as(command, cwd=playbook_dir)
Zerion Mini Shell 1.0