232 lines
7.1 KiB
Python
232 lines
7.1 KiB
Python
import argparse
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import importlib
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import json
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import logging
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import os
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from contextlib import ExitStack
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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 Log, run
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from clan_cli.completions import add_dynamic_completer, complete_machines
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from clan_cli.dirs import module_root, user_cache_dir, vm_state_dir
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from clan_cli.errors import ClanError
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from clan_cli.facts.generate import generate_facts
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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 .inspect import VmConfig, inspect_vm
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from .qemu import qemu_command
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from .virtiofsd import start_virtiofsd
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from .waypipe import start_waypipe
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log = logging.getLogger(__name__)
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def facts_to_nixos_config(facts: dict[str, dict[str, bytes]]) -> dict:
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nixos_config: dict = {}
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nixos_config["clanCore"] = {}
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nixos_config["clanCore"]["secrets"] = {}
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for service, service_facts in facts.items():
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nixos_config["clanCore"]["secrets"][service] = {}
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nixos_config["clanCore"]["secrets"][service]["facts"] = {}
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for fact, value in service_facts.items():
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nixos_config["clanCore"]["secrets"][service]["facts"][fact] = {
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"value": value.decode()
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}
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return nixos_config
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# TODO move this to the Machines class
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def build_vm(
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machine: Machine, tmpdir: Path, nix_options: list[str] | None = None
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) -> dict[str, str]:
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# TODO pass prompt here for the GTK gui
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if nix_options is None:
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nix_options = []
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secrets_dir = get_secrets(machine, tmpdir)
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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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public_facts = public_facts_store.get_all()
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nixos_config_file = machine.build_nix(
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"config.system.clan.vm.create",
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extra_config=facts_to_nixos_config(public_facts),
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nix_options=nix_options,
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)
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try:
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vm_data = json.loads(Path(nixos_config_file).read_text())
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vm_data["secrets_dir"] = str(secrets_dir)
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return vm_data
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except json.JSONDecodeError as e:
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msg = f"Failed to parse vm config: {e}"
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raise ClanError(msg) from e
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def get_secrets(
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machine: Machine,
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tmpdir: Path,
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) -> Path:
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secrets_dir = tmpdir / "secrets"
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secrets_dir.mkdir(parents=True, exist_ok=True)
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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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generate_facts([machine], None, False)
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secret_facts_store.upload(secrets_dir)
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return secrets_dir
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def prepare_disk(
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directory: Path,
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size: str = "1024M",
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file_name: str = "disk.img",
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) -> Path:
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disk_img = directory / file_name
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cmd = nix_shell(
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["nixpkgs#qemu"],
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[
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"qemu-img",
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"create",
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"-f",
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"qcow2",
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str(disk_img),
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size,
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],
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)
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run(
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cmd,
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log=Log.BOTH,
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error_msg=f"Could not create disk image at {disk_img}",
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)
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return disk_img
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def run_vm(
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vm: VmConfig,
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*,
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cachedir: Path | None = None,
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socketdir: Path | None = None,
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nix_options: list[str] | None = None,
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portmap: list[tuple[int, int]] | None = None,
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) -> None:
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if portmap is None:
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portmap = []
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if nix_options is None:
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nix_options = []
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with ExitStack() as stack:
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machine = Machine(name=vm.machine_name, flake=vm.flake_url)
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log.debug(f"Creating VM for {machine}")
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# store the temporary rootfs inside XDG_CACHE_HOME on the host
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# otherwise, when using /tmp, we risk running out of memory
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cache = user_cache_dir() / "clan"
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cache.mkdir(exist_ok=True)
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if cachedir is None:
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cache_tmp = stack.enter_context(TemporaryDirectory(dir=cache))
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cachedir = Path(cache_tmp)
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if socketdir is None:
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socket_tmp = stack.enter_context(TemporaryDirectory())
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socketdir = Path(socket_tmp)
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# TODO: We should get this from the vm argument
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nixos_config = build_vm(machine, cachedir, nix_options)
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state_dir = vm_state_dir(str(vm.flake_url), machine.name)
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state_dir.mkdir(parents=True, exist_ok=True)
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# specify socket files for qmp and qga
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qmp_socket_file = socketdir / "qmp.sock"
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qga_socket_file = socketdir / "qga.sock"
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# Create symlinks to the qmp/qga sockets to be able to find them later.
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# This indirection is needed because we cannot put the sockets directly
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# in the state_dir.
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# The reason is, qemu has a length limit of 108 bytes for the qmp socket
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# path which is violated easily.
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qmp_link = state_dir / "qmp.sock"
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if os.path.lexists(qmp_link):
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qmp_link.unlink()
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qmp_link.symlink_to(qmp_socket_file)
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qga_link = state_dir / "qga.sock"
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if os.path.lexists(qga_link):
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qga_link.unlink()
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qga_link.symlink_to(qga_socket_file)
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rootfs_img = prepare_disk(cachedir)
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state_img = state_dir / "state.qcow2"
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if not state_img.exists():
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state_img = prepare_disk(
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directory=state_dir,
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file_name="state.qcow2",
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size="50G",
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)
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virtiofsd_socket = socketdir / "virtiofsd.sock"
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qemu_cmd = qemu_command(
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vm,
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nixos_config,
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secrets_dir=Path(nixos_config["secrets_dir"]),
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rootfs_img=rootfs_img,
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state_img=state_img,
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virtiofsd_socket=virtiofsd_socket,
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qmp_socket_file=qmp_socket_file,
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qga_socket_file=qga_socket_file,
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portmap=portmap,
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)
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packages = ["nixpkgs#qemu"]
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env = os.environ.copy()
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if vm.graphics and not vm.waypipe:
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packages.append("nixpkgs#virt-viewer")
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remote_viewer_mimetypes = module_root() / "vms" / "mimetypes"
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env["XDG_DATA_DIRS"] = (
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f"{remote_viewer_mimetypes}:{env.get('XDG_DATA_DIRS', '')}"
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)
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with (
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start_waypipe(qemu_cmd.vsock_cid, f"[{vm.machine_name}] "),
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start_virtiofsd(virtiofsd_socket),
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):
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run(
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nix_shell(packages, qemu_cmd.args),
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env=env,
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log=Log.BOTH,
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error_msg=f"Could not start vm {machine}",
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)
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def run_command(
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args: argparse.Namespace,
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) -> None:
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machine_obj: Machine = Machine(args.machine, args.flake)
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vm: VmConfig = inspect_vm(machine=machine_obj)
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portmap = [p.split(":") for p in args.publish]
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run_vm(vm, nix_options=args.option, portmap=portmap)
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def register_run_parser(parser: argparse.ArgumentParser) -> None:
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machine_action = parser.add_argument(
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"machine", type=str, help="machine in the flake to run"
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)
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add_dynamic_completer(machine_action, complete_machines)
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# option: --publish 2222:22
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parser.add_argument(
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"--publish",
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"-p",
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action="append",
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type=str,
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default=[],
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help="Forward ports from host to guest",
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)
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parser.set_defaults(func=lambda args: run_command(args))
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