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# This file is part of cloud-init. See LICENSE file for license information.
"""Autoinstall: Support ubuntu live-server autoinstall syntax."""
import logging
import re
from textwrap import dedent
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import (
MetaSchema,
SchemaProblem,
SchemaValidationError,
get_meta_doc,
)
from cloudinit.settings import PER_ONCE
from cloudinit.subp import subp
LOG = logging.getLogger(__name__)
distros = ["ubuntu"]
meta: MetaSchema = {
"id": "cc_ubuntu_autoinstall",
"name": "Ubuntu Autoinstall",
"title": "Support Ubuntu live-server install syntax",
"description": dedent(
"""\
Ubuntu's autoinstall YAML supports single-system automated installs
in either the live-server install, via the ``subiquity`` snap, or the
next generation desktop installer, via `ubuntu-desktop-install` snap.
When "autoinstall" directives are provided in either
``#cloud-config`` user-data or ``/etc/cloud/cloud.cfg.d`` validate
minimal autoinstall schema adherance and emit a warning if the
live-installer is not present.
The live-installer will use autoinstall directives to seed answers to
configuration prompts during system install to allow for a
"touchless" or non-interactive Ubuntu system install.
For more details on Ubuntu's autoinstaller:
https://ubuntu.com/server/docs/install/autoinstall
"""
),
"distros": distros,
"examples": [
dedent(
"""\
# Tell the live-server installer to provide dhcp6 network config
# and LVM on a disk matching the serial number prefix CT
autoinstall:
version: 1
network:
version: 2
ethernets:
enp0s31f6:
dhcp6: yes
storage:
layout:
name: lvm
match:
serial: CT*
"""
)
],
"frequency": PER_ONCE,
"activate_by_schema_keys": ["autoinstall"],
}
__doc__ = get_meta_doc(meta)
LIVE_INSTALLER_SNAPS = ("subiquity", "ubuntu-desktop-installer")
def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:
if "autoinstall" not in cfg:
LOG.debug(
"Skipping module named %s, no 'autoinstall' key in configuration",
name,
)
return
snap_list, _ = subp(["snap", "list"])
installer_present = None
for snap_name in LIVE_INSTALLER_SNAPS:
if re.search(snap_name, snap_list):
installer_present = snap_name
if not installer_present:
LOG.warning(
"Skipping autoinstall module. Expected one of the Ubuntu"
" installer snap packages to be present: %s",
", ".join(LIVE_INSTALLER_SNAPS),
)
return
validate_config_schema(cfg)
LOG.debug(
"Valid autoinstall schema. Config will be processed by %s",
installer_present,
)
def validate_config_schema(cfg):
"""Supplemental runtime schema validation for autoinstall yaml.
Schema validation issues currently result in a warning log currently which
can be easily ignored because warnings do not bubble up to cloud-init
status output.
In the case of the live-installer, we want cloud-init to raise an error
to set overall cloud-init status to 'error' so it is more discoverable
in installer environments.
# TODO(Drop this validation When cloud-init schema is strict and errors)
:raise: SchemaValidationError if any known schema values are present.
"""
autoinstall_cfg = cfg["autoinstall"]
if not isinstance(autoinstall_cfg, dict):
raise SchemaValidationError(
[
SchemaProblem(
"autoinstall",
"Expected dict type but found:"
f" {type(autoinstall_cfg).__name__}",
)
]
)
if "version" not in autoinstall_cfg:
raise SchemaValidationError(
[SchemaProblem("autoinstall", "Missing required 'version' key")]
)
elif not isinstance(autoinstall_cfg.get("version"), int):
raise SchemaValidationError(
[
SchemaProblem(
"autoinstall.version",
f"Expected int type but found:"
f" {type(autoinstall_cfg['version']).__name__}",
)
]
)