193 lines
6.4 KiB
Python
193 lines
6.4 KiB
Python
import json
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import logging
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from collections.abc import Callable
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any
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from uuid import uuid4
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from clan_cli.api import API
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from clan_cli.dirs import TemplateType, clan_templates
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from clan_cli.errors import ClanError
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from clan_cli.git import commit_file
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from clan_cli.machines.hardware import HardwareConfig, show_machine_hardware_config
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log = logging.getLogger(__name__)
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def disk_in_facter_report(hw_report: dict) -> bool:
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return "hardware" in hw_report and "disk" in hw_report["hardware"]
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def get_best_unix_device_name(unix_device_names: list[str]) -> str:
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# find the first device name that is disk/by-id
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for device_name in unix_device_names:
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if "disk/by-id" in device_name:
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return device_name
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else:
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# if no by-id found, use the first device name
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return unix_device_names[0]
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def hw_main_disk_options(hw_report: dict) -> list[str]:
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if not disk_in_facter_report(hw_report):
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msg = "hw_report doesnt include 'disk' information"
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raise ClanError(msg, description=f"{hw_report.keys()}")
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disks = hw_report["hardware"]["disk"]
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options: list[str] = []
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for disk in disks:
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unix_device_names = disk["unix_device_names"]
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device_name = get_best_unix_device_name(unix_device_names)
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options += [device_name]
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return options
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@dataclass
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class Placeholder:
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# Input name for the user
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label: str
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options: list[str] | None
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required: bool
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@dataclass
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class DiskSchema:
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name: str
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placeholders: dict[str, Placeholder]
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# must be manually kept in sync with the ${clancore}/templates/disks directory
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templates: dict[str, dict[str, Callable[[dict[str, Any]], Placeholder]]] = {
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"single-disk": {
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# Placeholders
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"mainDisk": lambda hw_report: Placeholder(
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label="Main disk", options=hw_main_disk_options(hw_report), required=True
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),
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}
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}
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@API.register
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def get_disk_schemas(base_path: Path, machine_name: str) -> dict[str, DiskSchema]:
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"""
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Get the available disk schemas
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"""
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disk_templates = clan_templates(TemplateType.DISK)
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disk_schemas = {}
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hw_report_path = HardwareConfig.NIXOS_FACTER.config_path(base_path, machine_name)
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if not hw_report_path.exists():
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msg = "Hardware configuration missing"
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raise ClanError(msg)
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hw_report = {}
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with hw_report_path.open("r") as hw_report_file:
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hw_report = json.load(hw_report_file)
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for disk_template in disk_templates.iterdir():
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if disk_template.is_file():
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schema_name = disk_template.stem
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if schema_name not in templates:
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msg = f"Disk schema {schema_name} not found in templates"
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raise ClanError(
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msg,
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description="This is an internal architecture problem. Because disk schemas dont define their own interface",
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)
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placeholder_getters = templates.get(schema_name)
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placeholders = {}
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if placeholder_getters:
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placeholders = {k: v(hw_report) for k, v in placeholder_getters.items()}
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disk_schemas[schema_name] = DiskSchema(
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name=schema_name, placeholders=placeholders
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)
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return disk_schemas
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@API.register
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def set_machine_disk_schema(
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base_path: Path,
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machine_name: str,
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schema_name: str,
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# Placeholders are used to fill in the disk schema
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# Use get disk schemas to get the placeholders and their options
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placeholders: dict[str, str],
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force: bool = False,
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) -> None:
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"""
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Set the disk placeholders of the template
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"""
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# Assert the hw-config must exist before setting the disk
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hw_config = show_machine_hardware_config(base_path, machine_name)
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hw_config_path = hw_config.config_path(base_path, machine_name)
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if not hw_config_path.exists():
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msg = "Hardware configuration must exist before applying disk schema"
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raise ClanError(msg)
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if hw_config != HardwareConfig.NIXOS_FACTER:
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msg = "Hardware configuration must use type FACTER for applying disk schema automatically"
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raise ClanError(msg)
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disk_schema_path = clan_templates(TemplateType.DISK) / f"{schema_name}.nix"
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if not disk_schema_path.exists():
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msg = f"Disk schema not found at {disk_schema_path}"
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raise ClanError(msg)
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# Check that the placeholders are valid
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disk_schema = get_disk_schemas(base_path, machine_name)[schema_name]
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# check that all required placeholders are present
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for placeholder_name, schema_placeholder in disk_schema.placeholders.items():
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if schema_placeholder.required and placeholder_name not in placeholders:
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msg = f"Required placeholder {placeholder_name} - {schema_placeholder} missing"
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raise ClanError(msg)
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# For every placeholder check that the value is valid
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for placeholder_name, placeholder_value in placeholders.items():
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ph = disk_schema.placeholders.get(placeholder_name)
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# Unknown placeholder
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if not ph:
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msg = (
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f"Placeholder {placeholder_name} not found in disk schema {schema_name}"
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)
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raise ClanError(msg)
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# Invalid value. Check if the value is one of the provided options
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if ph.options and placeholder_value not in ph.options:
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msg = (
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f"Invalid value {placeholder_value} for placeholder {placeholder_name}"
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)
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raise ClanError(msg, description=f"Valid options: {ph.options}")
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with disk_schema_path.open("r") as disk_template:
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config_str = disk_template.read()
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for placeholder_name, placeholder_value in placeholders.items():
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config_str = config_str.replace(
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r"{{" + placeholder_name + r"}}", placeholder_value
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)
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# Custom replacements
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config_str = config_str.replace(r"{{uuid}}", str(uuid4()).replace("-", ""))
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# place disko.nix alongside the hw-config
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disko_file_path = hw_config_path.parent.joinpath("disko.nix")
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if disko_file_path.exists() and not force:
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msg = f"Disk schema already exists at {disko_file_path}"
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raise ClanError(msg)
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with disko_file_path.open("w") as disk_config:
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disk_config.write(config_str)
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commit_file(
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disko_file_path,
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base_path,
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commit_message=f"Set disk schema of machine: {machine_name} to {schema_name}",
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)
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