265 lines
8.6 KiB
Python
265 lines
8.6 KiB
Python
import argparse
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import importlib
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import logging
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import os
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import sys
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import traceback
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from collections.abc import Callable
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from pathlib import Path
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from tempfile import TemporaryDirectory
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from clan_cli.cmd import RunOpts, run
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from clan_cli.completions import (
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add_dynamic_completer,
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complete_machines,
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complete_services_for_machine,
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)
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from clan_cli.errors import ClanError
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from clan_cli.git import commit_files
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from clan_cli.machines.inventory import get_all_machines, get_selected_machines
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from clan_cli.machines.machines import Machine
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from clan_cli.nix import nix_shell
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from .check import check_secrets
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from .public_modules import FactStoreBase
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from .secret_modules import SecretStoreBase
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log = logging.getLogger(__name__)
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def read_multiline_input(prompt: str = "Finish with Ctrl-D") -> str:
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"""
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Read multi-line input from stdin.
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"""
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print(prompt, flush=True)
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proc = run(["cat"], RunOpts(check=False))
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log.info("Input received. Processing...")
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return proc.stdout.rstrip(os.linesep).rstrip()
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def bubblewrap_cmd(generator: str, facts_dir: Path, secrets_dir: Path) -> list[str]:
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# fmt: off
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return nix_shell(
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[
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"nixpkgs#bash",
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"nixpkgs#bubblewrap",
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],
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[
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"bwrap",
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"--unshare-all",
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"--tmpfs", "/",
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"--ro-bind", "/nix/store", "/nix/store",
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"--dev", "/dev",
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# not allowed to bind procfs in some sandboxes
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"--bind", str(facts_dir), str(facts_dir),
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"--bind", str(secrets_dir), str(secrets_dir),
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"--chdir", "/",
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# Doesn't work in our CI?
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#"--proc", "/proc",
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#"--hostname", "facts",
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"--bind", "/proc", "/proc",
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"--uid", "1000",
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"--gid", "1000",
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"--",
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"bash", "-c", generator
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],
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)
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# fmt: on
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def generate_service_facts(
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machine: Machine,
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service: str,
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regenerate: bool,
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secret_facts_store: SecretStoreBase,
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public_facts_store: FactStoreBase,
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tmpdir: Path,
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prompt: Callable[[str, str], str],
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) -> bool:
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service_dir = tmpdir / service
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# check if all secrets exist and generate them if at least one is missing
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needs_regeneration = not check_secrets(machine, service=service)
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machine.debug(f"{service} needs_regeneration: {needs_regeneration}")
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if not (needs_regeneration or regenerate):
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return False
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if not isinstance(machine.flake, Path):
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msg = f"flake is not a Path: {machine.flake}"
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msg += "fact/secret generation is only supported for local flakes"
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env = os.environ.copy()
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facts_dir = service_dir / "facts"
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facts_dir.mkdir(parents=True)
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env["facts"] = str(facts_dir)
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secrets_dir = service_dir / "secrets"
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secrets_dir.mkdir(parents=True)
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env["secrets"] = str(secrets_dir)
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# compatibility for old outputs.nix users
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if isinstance(machine.facts_data[service]["generator"], str):
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generator = machine.facts_data[service]["generator"]
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else:
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generator = machine.facts_data[service]["generator"]["finalScript"]
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if machine.facts_data[service]["generator"]["prompt"]:
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prompt_value = prompt(
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service, machine.facts_data[service]["generator"]["prompt"]
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)
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env["prompt_value"] = prompt_value
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from clan_cli import bwrap
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if sys.platform == "linux" and bwrap.bubblewrap_works():
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cmd = bubblewrap_cmd(generator, facts_dir, secrets_dir)
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else:
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cmd = ["bash", "-c", generator]
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run(
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cmd,
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RunOpts(env=env),
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)
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files_to_commit = []
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# store secrets
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for secret_name, secret in machine.facts_data[service]["secret"].items():
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groups = secret.get("groups", [])
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secret_file = secrets_dir / secret_name
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if not secret_file.is_file():
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msg = f"did not generate a file for '{secret_name}' when running the following command:\n"
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msg += generator
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raise ClanError(msg)
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secret_path = secret_facts_store.set(
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service, secret_name, secret_file.read_bytes(), groups
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)
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if secret_path:
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files_to_commit.append(secret_path)
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# store facts
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for name in machine.facts_data[service]["public"]:
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fact_file = facts_dir / name
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if not fact_file.is_file():
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msg = f"did not generate a file for '{name}' when running the following command:\n"
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msg += machine.facts_data[service]["generator"]
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raise ClanError(msg)
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fact_file = public_facts_store.set(service, name, fact_file.read_bytes())
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if fact_file:
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files_to_commit.append(fact_file)
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commit_files(
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files_to_commit,
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machine.flake_dir,
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f"Update facts/secrets for service {service} in machine {machine.name}",
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)
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return True
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def prompt_func(service: str, text: str) -> str:
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print(f"{text}: ")
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return read_multiline_input()
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def _generate_facts_for_machine(
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machine: Machine,
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service: str | None,
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regenerate: bool,
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tmpdir: Path,
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prompt: Callable[[str, str], str] = prompt_func,
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) -> bool:
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local_temp = tmpdir / machine.name
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local_temp.mkdir()
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secret_facts_module = importlib.import_module(machine.secret_facts_module)
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secret_facts_store = secret_facts_module.SecretStore(machine=machine)
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public_facts_module = importlib.import_module(machine.public_facts_module)
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public_facts_store = public_facts_module.FactStore(machine=machine)
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machine_updated = False
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if service and service not in machine.facts_data:
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services = list(machine.facts_data.keys())
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msg = f"Could not find service with name: {service}. The following services are available: {services}"
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raise ClanError(msg)
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if service:
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machine_service_facts = {service: machine.facts_data[service]}
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else:
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machine_service_facts = machine.facts_data
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for service in machine_service_facts:
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machine_updated |= generate_service_facts(
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machine=machine,
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service=service,
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regenerate=regenerate,
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secret_facts_store=secret_facts_store,
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public_facts_store=public_facts_store,
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tmpdir=local_temp,
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prompt=prompt,
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)
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if machine_updated:
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# flush caches to make sure the new secrets are available in evaluation
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machine.flush_caches()
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return machine_updated
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def generate_facts(
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machines: list[Machine],
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service: str | None = None,
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regenerate: bool = False,
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prompt: Callable[[str, str], str] = prompt_func,
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) -> bool:
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was_regenerated = False
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with TemporaryDirectory(prefix="facts-generate-") as tmp:
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tmpdir = Path(tmp)
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for machine in machines:
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errors = 0
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try:
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was_regenerated |= _generate_facts_for_machine(
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machine, service, regenerate, tmpdir, prompt
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)
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except (OSError, ClanError) as e:
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machine.error(f"Failed to generate facts: {e}")
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traceback.print_exc()
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errors += 1
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if errors > 0:
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msg = (
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f"Failed to generate facts for {errors} hosts. Check the logs above"
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)
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raise ClanError(msg)
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if not was_regenerated and len(machines) > 0:
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machine.info("All secrets and facts are already up to date")
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return was_regenerated
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def generate_command(args: argparse.Namespace) -> None:
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if args.flake is None:
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msg = "Could not find clan flake toplevel directory"
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raise ClanError(msg)
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if len(args.machines) == 0:
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machines = get_all_machines(args.flake, args.option)
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else:
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machines = get_selected_machines(args.flake, args.option, args.machines)
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generate_facts(machines, args.service, args.regenerate)
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def register_generate_parser(parser: argparse.ArgumentParser) -> None:
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machines_parser = parser.add_argument(
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"machines",
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type=str,
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help="machine to generate facts for. if empty, generate facts for all machines",
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nargs="*",
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default=[],
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)
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add_dynamic_completer(machines_parser, complete_machines)
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service_parser = parser.add_argument(
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"--service",
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type=str,
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help="service to generate facts for, if empty, generate facts for every service",
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default=None,
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)
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add_dynamic_completer(service_parser, complete_services_for_machine)
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parser.add_argument(
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"--regenerate",
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action=argparse.BooleanOptionalAction,
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help="whether to regenerate facts for the specified machine",
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default=None,
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)
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parser.set_defaults(func=generate_command)
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