310 lines
9.8 KiB
Python
310 lines
9.8 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 dataclasses import dataclass, field
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from pathlib import Path
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from tempfile import TemporaryDirectory
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from typing import IO
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from ..cmd import Log, run
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from ..dirs import machine_gcroot, module_root, user_cache_dir, vm_state_dir
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from ..errors import ClanError
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from ..machines.machines import Machine
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from ..nix import nix_build, nix_config, nix_shell
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from ..secrets.generate import generate_secrets
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from .inspect import VmConfig, inspect_vm
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log = logging.getLogger(__name__)
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def graphics_options(vm: VmConfig) -> list[str]:
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common = ["-audio", "driver=pa,model=virtio"]
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if vm.wayland:
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# fmt: off
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return [
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*common,
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"-nographic",
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"-vga", "none",
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"-device", "virtio-gpu-rutabaga,gfxstream-vulkan=on,cross-domain=on,hostmem=4G,wsi=headless",
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]
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# fmt: on
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else:
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# fmt: off
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return [
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*common,
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"-vga", "none",
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"-display", "gtk,gl=on",
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"-device", "virtio-gpu-gl",
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"-display", "spice-app,gl=on",
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"-device", "virtio-serial-pci",
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"-chardev", "spicevmc,id=vdagent0,name=vdagent",
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"-device", "virtserialport,chardev=vdagent0,name=com.redhat.spice.0",
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"-device", "qemu-xhci,id=spicepass",
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"-chardev", "spicevmc,id=usbredirchardev1,name=usbredir",
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"-device", "usb-redir,chardev=usbredirchardev1,id=usbredirdev1",
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"-chardev", "spicevmc,id=usbredirchardev2,name=usbredir",
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"-device", "usb-redir,chardev=usbredirchardev2,id=usbredirdev2",
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"-chardev", "spicevmc,id=usbredirchardev3,name=usbredir",
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"-device", "usb-redir,chardev=usbredirchardev3,id=usbredirdev3",
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"-device", "pci-ohci,id=smartpass",
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"-device", "usb-ccid",
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"-chardev", "spicevmc,id=ccid,name=smartcard",
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]
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# fmt: on
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def qemu_command(
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vm: VmConfig,
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nixos_config: dict[str, str],
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xchg_dir: Path,
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secrets_dir: Path,
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rootfs_img: Path,
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state_img: Path,
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qmp_socket_file: Path,
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qga_socket_file: Path,
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) -> list[str]:
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kernel_cmdline = [
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(Path(nixos_config["toplevel"]) / "kernel-params").read_text(),
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f'init={nixos_config["toplevel"]}/init',
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f'regInfo={nixos_config["regInfo"]}/registration',
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"console=ttyS0,115200n8",
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]
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if not vm.wayland:
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kernel_cmdline.append("console=tty0")
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# fmt: off
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command = [
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"qemu-kvm",
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"-name", vm.machine_name,
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"-m", f'{nixos_config["memorySize"]}M',
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"-smp", str(nixos_config["cores"]),
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"-cpu", "max",
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"-enable-kvm",
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"-device", "virtio-rng-pci",
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"-net", "nic,netdev=user.0,model=virtio",
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"-netdev", "user,id=user.0",
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"-virtfs", "local,path=/nix/store,security_model=none,mount_tag=nix-store",
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"-virtfs", f"local,path={xchg_dir},security_model=none,mount_tag=shared",
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"-virtfs", f"local,path={xchg_dir},security_model=none,mount_tag=xchg",
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"-virtfs", f"local,path={secrets_dir},security_model=none,mount_tag=secrets",
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"-drive", f"cache=writeback,file={rootfs_img},format=raw,id=drive1,if=none,index=1,werror=report",
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"-device", "virtio-blk-pci,bootindex=1,drive=drive1,serial=root",
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"-drive", f"cache=writeback,file={state_img},format=qcow2,id=state,if=none,index=2,werror=report",
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"-device", "virtio-blk-pci,drive=state",
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"-device", "virtio-keyboard",
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"-usb", "-device", "usb-tablet,bus=usb-bus.0",
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"-kernel", f'{nixos_config["toplevel"]}/kernel',
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"-initrd", nixos_config["initrd"],
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"-append", " ".join(kernel_cmdline),
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# qmp & qga setup
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"-qmp", f"unix:{qmp_socket_file},server,wait=off",
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"-chardev", f"socket,path={qga_socket_file},server=on,wait=off,id=qga0",
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"-device", "virtio-serial",
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"-device", "virtserialport,chardev=qga0,name=org.qemu.guest_agent.0",
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] # fmt: on
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if vm.graphics:
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command.extend(graphics_options(vm))
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else:
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command.append("-nographic")
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return command
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# TODO move this to the Machines class
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def get_vm_create_info(
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machine: Machine, vm: VmConfig, nix_options: list[str]
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) -> dict[str, str]:
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config = nix_config()
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system = config["system"]
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clan_dir = machine.flake
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cmd = nix_build(
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[
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f'{clan_dir}#clanInternals.machines."{system}"."{machine.name}".config.system.clan.vm.create',
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*nix_options,
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],
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machine_gcroot(clan_name=vm.clan_name, flake_url=str(vm.flake_url))
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/ f"vm-{machine.name}",
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)
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proc = run(
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cmd, log=Log.BOTH, error_msg=f"Could not build vm config for {machine.name}"
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)
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try:
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return json.loads(Path(proc.stdout.strip()).read_text())
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except json.JSONDecodeError as e:
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raise ClanError(f"Failed to parse vm config: {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(exist_ok=True)
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secrets_module = importlib.import_module(machine.secrets_module)
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secret_store = secrets_module.SecretStore(machine=machine)
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# Only generate secrets for local clans
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if isinstance(machine.flake, Path) and machine.flake.is_dir():
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generate_secrets(machine)
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else:
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log.warning("won't generate secrets for non local clan")
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secret_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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disk_format: str = "raw",
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size: str = "1024M",
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label: str = "nixos",
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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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disk_format,
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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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if disk_format == "raw":
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cmd = nix_shell(
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["nixpkgs#e2fsprogs"],
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[
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"mkfs.ext4",
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"-L",
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label,
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str(disk_img),
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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 ext4 filesystem 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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nix_options: list[str] = [],
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log_fd: IO[str] | None = None,
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) -> None:
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"""
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log_fd can be used to stream the output of all commands to a UI
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"""
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machine = Machine(vm.machine_name, vm.flake_url)
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log.debug(f"Creating VM for {machine}")
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# TODO: We should get this from the vm argument
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nixos_config = get_vm_create_info(machine, vm, nix_options)
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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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with TemporaryDirectory(dir=cache) as cachedir, TemporaryDirectory() as sockets:
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tmpdir = Path(cachedir)
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xchg_dir = tmpdir / "xchg"
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xchg_dir.mkdir(exist_ok=True)
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secrets_dir = get_secrets(machine, tmpdir)
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state_dir = vm_state_dir(vm.clan_name, 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 = Path(sockets) / "qmp.sock"
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qga_socket_file = Path(sockets) / "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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(state_dir / "qmp.sock").symlink_to(qmp_socket_file)
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(state_dir / "qga.sock").symlink_to(qga_socket_file)
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rootfs_img = prepare_disk(tmpdir)
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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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disk_format="qcow2",
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size="50G",
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label="state",
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)
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qemu_cmd = qemu_command(
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vm,
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nixos_config,
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xchg_dir=xchg_dir,
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secrets_dir=secrets_dir,
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rootfs_img=rootfs_img,
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state_img=state_img,
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qmp_socket_file=qmp_socket_file,
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qga_socket_file=qga_socket_file,
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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.wayland:
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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[
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"XDG_DATA_DIRS"
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] = f"{remote_viewer_mimetypes}:{env.get('XDG_DATA_DIRS', '')}"
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run(
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nix_shell(packages, qemu_cmd),
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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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@dataclass
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class RunOptions:
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machine: str
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flake: Path
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nix_options: list[str] = field(default_factory=list)
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wayland: bool = False
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def run_command(args: argparse.Namespace) -> None:
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run_options = RunOptions(
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machine=args.machine,
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flake=args.flake,
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nix_options=args.option,
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wayland=args.wayland,
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)
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machine = Machine(run_options.machine, run_options.flake)
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vm = inspect_vm(machine=machine)
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# TODO: allow to set this in the config
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vm.wayland = run_options.wayland
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run_vm(vm, run_options.nix_options)
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def register_run_parser(parser: argparse.ArgumentParser) -> None:
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parser.add_argument("machine", type=str, help="machine in the flake to run")
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parser.add_argument("--flake-url", type=str, help="flake url")
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parser.add_argument("--wayland", action="store_true", help="use wayland")
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parser.set_defaults(func=run_command)
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