mirror of
https://github.com/RichieCahill/dotfiles.git
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683 lines
21 KiB
Python
683 lines
21 KiB
Python
"""Install NixOS on a ZFS pool."""
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from __future__ import annotations
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import curses
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import logging
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import sys
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from collections import defaultdict
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from os import getenv
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from pathlib import Path
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from random import getrandbits
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from subprocess import PIPE, Popen, run
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from time import sleep
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from collections.abc import Sequence
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def configure_logger(level: str = "INFO") -> None:
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"""Configure the logger.
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Args:
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level (str, optional): The logging level. Defaults to "INFO".
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"""
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logging.basicConfig(
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level=level,
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datefmt="%Y-%m-%dT%H:%M:%S%z",
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format="%(asctime)s %(levelname)s %(filename)s:%(lineno)d - %(message)s",
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handlers=[logging.StreamHandler(sys.stdout)],
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)
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def bash_wrapper(command: str) -> str:
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"""Execute a bash command and capture the output.
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Args:
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command (str): The bash command to be executed.
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Returns:
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Tuple[str, int]: A tuple containing the output of the command (stdout) as a string,
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the error output (stderr) as a string (optional), and the return code as an integer.
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"""
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logging.debug(f"running {command=}")
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# This is a acceptable risk
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process = Popen(command.split(), stdout=PIPE, stderr=PIPE) # noqa: S603
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output, _ = process.communicate()
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if process.returncode != 0:
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error = f"Failed to run command {command=} return code {process.returncode=}"
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raise RuntimeError(error)
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return output.decode()
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def partition_disk(disk: str, swap_size: int, reserve: int = 0) -> None:
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"""Partition a disk.
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Args:
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disk (str): The disk to partition.
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swap_size (int): The size of the swap partition in GB.
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minimum value is 1.
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reserve (int, optional): The size of the reserve partition in GB. Defaults to 0.
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minimum value is 0.
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"""
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logging.info(f"partitioning {disk=}")
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swap_size = max(swap_size, 1)
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reserve = max(reserve, 0)
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bash_wrapper(f"blkdiscard -f {disk}")
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if reserve > 0:
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msg = f"Creating swap partition on {disk=} with size {swap_size=}GiB and reserve {reserve=}GiB"
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logging.info(msg)
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swap_start = swap_size + reserve
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swap_partition = f"mkpart swap -{swap_start}GiB -{reserve}GiB "
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else:
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logging.info(f"Creating swap partition on {disk=} with size {swap_size=}GiB")
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swap_start = swap_size
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swap_partition = f"mkpart swap -{swap_start}GiB 100% "
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logging.debug(f"{swap_partition=}")
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create_partitions = (
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f"parted --script --align=optimal {disk} -- "
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"mklabel gpt "
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"mkpart EFI 1MiB 4GiB "
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f"mkpart root_pool 4GiB -{swap_start}GiB "
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f"{swap_partition}"
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"set 1 esp on"
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)
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bash_wrapper(create_partitions)
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logging.info(f"{disk=} successfully partitioned")
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def create_zfs_pool(pool_disks: Sequence[str], mnt_dir: str) -> None:
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"""Create a ZFS pool.
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Args:
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disks (Sequence[str]): A tuple of disks to use for the pool.
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mnt_dir (str): The mount directory.
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"""
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if len(pool_disks) <= 0:
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error = "disks must be a tuple of at least length 1"
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raise ValueError(error)
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zpool_create = (
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"zpool create "
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"-o ashift=12 "
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"-o autotrim=on "
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f"-R {mnt_dir} "
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"-O acltype=posixacl "
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"-O canmount=off "
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"-O dnodesize=auto "
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"-O normalization=formD "
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"-O relatime=on "
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"-O xattr=sa "
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"-O mountpoint=legacy "
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"-O compression=zstd "
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"-O atime=off "
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"root_pool "
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)
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if len(pool_disks) == 1:
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zpool_create += pool_disks[0]
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else:
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zpool_create += "mirror "
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zpool_create += " ".join(pool_disks)
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bash_wrapper(zpool_create)
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zpools = bash_wrapper("zpool list -o name")
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if "root_pool" not in zpools.splitlines():
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logging.critical("Failed to create root_pool")
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sys.exit(1)
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def create_zfs_datasets() -> None:
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"""Create ZFS datasets."""
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bash_wrapper("zfs create -o canmount=noauto -o reservation=10G root_pool/root")
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bash_wrapper("zfs create root_pool/home")
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bash_wrapper("zfs create root_pool/var -o reservation=1G")
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bash_wrapper("zfs create -o compression=zstd-9 -o reservation=10G root_pool/nix")
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datasets = bash_wrapper("zfs list -o name")
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expected_datasets = {
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"root_pool/root",
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"root_pool/home",
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"root_pool/var",
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"root_pool/nix",
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}
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missing_datasets = expected_datasets.difference(datasets.splitlines())
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if missing_datasets:
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logging.critical(f"Failed to create pools {missing_datasets}")
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sys.exit(1)
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def get_cpu_manufacturer() -> str:
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"""Get the CPU manufacturer."""
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output = bash_wrapper("cat /proc/cpuinfo")
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id_vendor = {"AuthenticAMD": "amd", "GenuineIntel": "intel"}
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for line in output.splitlines():
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if "vendor_id" in line:
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return id_vendor[line.split(": ")[1].strip()]
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def get_boot_drive_id(disk: str) -> str:
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"""Get the boot drive ID."""
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output = bash_wrapper(f"lsblk -o UUID {disk}-part1")
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return output.splitlines()[1]
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def create_nix_hardware_file(mnt_dir: str, disks: Sequence[str], encrypt: bool) -> None:
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"""Create a NixOS hardware file."""
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cpu_manufacturer = get_cpu_manufacturer()
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devices = ""
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if encrypt:
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disk = disks[0]
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devices = (
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f' luks.devices."luks-root-pool-{disk.split("/")[-1]}-part2"'
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"= {\n"
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f' device = "{disk}-part2";\n'
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" bypassWorkqueues = true;\n"
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" allowDiscards = true;\n"
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" };\n"
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)
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host_id = format(getrandbits(32), "08x")
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nix_hardware = (
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"{ config, lib, modulesPath, ... }:\n"
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"{\n"
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' imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];\n\n'
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" boot = {\n"
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" initrd = {\n"
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' availableKernelModules = [ \n "ahci"\n "ehci_pci"\n "nvme"\n "sd_mod"\n "usb_storage"\n "usbhid"\n "xhci_pci"\n ];\n'
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" kernelModules = [ ];\n"
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f" {devices}"
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" };\n"
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f' kernelModules = [ "kvm-{cpu_manufacturer}" ];\n'
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" extraModulePackages = [ ];\n"
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" };\n\n"
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" fileSystems = {\n"
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' "/" = lib.mkDefault {\n device = "root_pool/root";\n fsType = "zfs";\n };\n\n'
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' "/home" = {\n device = "root_pool/home";\n fsType = "zfs";\n };\n\n'
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' "/var" = {\n device = "root_pool/var";\n fsType = "zfs";\n };\n\n'
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' "/nix" = {\n device = "root_pool/nix";\n fsType = "zfs";\n };\n\n'
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' "/boot" = {\n'
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f' device = "/dev/disk/by-uuid/{get_boot_drive_id(disks[0])}";\n'
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' fsType = "vfat";\n options = [\n "fmask=0077"\n "dmask=0077"\n ];\n };\n };\n\n'
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" swapDevices = [ ];\n\n"
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" networking.useDHCP = lib.mkDefault true;\n\n"
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' nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";\n'
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f" hardware.cpu.{cpu_manufacturer}.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;\n"
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f' networking.hostId = "{host_id}";\n'
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"}\n"
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)
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Path(f"{mnt_dir}/etc/nixos/hardware-configuration.nix").write_text(nix_hardware)
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def install_nixos(mnt_dir: str, disks: Sequence[str], encrypt: bool) -> None:
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"""Install NixOS."""
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bash_wrapper(f"mount -o X-mount.mkdir -t zfs root_pool/root {mnt_dir}")
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bash_wrapper(f"mount -o X-mount.mkdir -t zfs root_pool/home {mnt_dir}/home")
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bash_wrapper(f"mount -o X-mount.mkdir -t zfs root_pool/var {mnt_dir}/var")
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bash_wrapper(f"mount -o X-mount.mkdir -t zfs root_pool/nix {mnt_dir}/nix")
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for disk in disks:
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bash_wrapper(f"mkfs.vfat -n EFI {disk}-part1")
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# set up mirroring afterwards if more than one disk
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boot_partition = f"mount -t vfat -o fmask=0077,dmask=0077,iocharset=iso8859-1,X-mount.mkdir {disks[0]}-part1 {mnt_dir}/boot"
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bash_wrapper(boot_partition)
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bash_wrapper(f"nixos-generate-config --root {mnt_dir}")
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create_nix_hardware_file(mnt_dir, disks, encrypt)
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run(("nixos-install", "--root", mnt_dir), check=True) # noqa: S603
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def installer(
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disks: set[str],
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swap_size: int,
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reserve: int,
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encrypt_key: str | None,
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) -> None:
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"""Main."""
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logging.info("Starting installation")
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for disk in disks:
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partition_disk(disk, swap_size, reserve)
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if encrypt_key:
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sleep(1)
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for command in (
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f'printf "{encrypt_key}" | cryptsetup luksFormat --type luks2 {disk}-part2 -',
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f'printf "{encrypt_key}" | cryptsetup luksOpen {disk}-part2 luks-root-pool-{disk.split("/")[-1]}-part2 -',
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):
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run(command, shell=True, check=True)
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mnt_dir = "/tmp/nix_install" # noqa: S108
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Path(mnt_dir).mkdir(parents=True, exist_ok=True)
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if encrypt_key:
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pool_disks = [
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f"/dev/mapper/luks-root-pool-{disk.split('/')[-1]}-part2" for disk in disks
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]
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else:
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pool_disks = [f"{disk}-part2" for disk in disks]
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create_zfs_pool(pool_disks, mnt_dir)
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create_zfs_datasets()
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install_nixos(mnt_dir, disks, encrypt_key)
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logging.info("Installation complete")
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class Cursor:
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def __init__(self):
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self.x_position = 0
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self.y_position = 0
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self.height = 0
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self.width = 0
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def set_height(self, height: int):
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self.height = height
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def set_width(self, width: int):
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self.width = width
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def x_bounce_check(self, cursor: int) -> int:
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cursor = max(0, cursor)
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return min(self.width - 1, cursor)
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def y_bounce_check(self, cursor: int) -> int:
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cursor = max(0, cursor)
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return min(self.height - 1, cursor)
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def set_x(self, x: int):
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self.x_position = self.x_bounce_check(x)
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def set_y(self, y: int):
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self.y_position = self.y_bounce_check(y)
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def get_x(self) -> int:
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return self.x_position
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def get_y(self) -> int:
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return self.y_position
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def move_up(self):
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self.set_y(self.y_position - 1)
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def move_down(self):
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self.set_y(self.y_position + 1)
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def move_left(self):
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self.set_x(self.x_position - 1)
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def move_right(self):
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self.set_x(self.x_position + 1)
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def navigation(self, key: int) -> None:
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action = {
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curses.KEY_DOWN: self.move_down,
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curses.KEY_UP: self.move_up,
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curses.KEY_RIGHT: self.move_right,
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curses.KEY_LEFT: self.move_left,
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}
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action.get(key, lambda: None)()
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class State:
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"""State class to store the state of the program."""
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def __init__(self):
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self.key = 0
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self.cursor = Cursor()
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self.swap_size = 0
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self.show_swap_input = False
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self.reserve_size = 0
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self.show_reserve_input = False
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self.selected_device_ids = set()
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def get_selected_devices(self) -> tuple[str]:
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"""Get selected devices."""
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return tuple(self.selected_device_ids)
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def get_device(raw_device: str) -> dict[str, str]:
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raw_device_components = raw_device.split(" ")
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return {
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thing.split("=")[0].lower(): thing.split("=")[1].strip('"')
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for thing in raw_device_components
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}
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def get_devices() -> list[dict[str, str]]:
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"""Get a list of devices."""
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# --bytes
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raw_devices = bash_wrapper("lsblk --paths --pairs").splitlines()
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return [get_device(raw_device) for raw_device in raw_devices]
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def get_device_id_mapping() -> dict[str, set[str]]:
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"""Get a list of device ids.
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Returns:
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list[str]: the list of device ids
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"""
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device_ids = bash_wrapper("find /dev/disk/by-id -type l").splitlines()
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device_id_mapping: dict[str, set[str]] = defaultdict(set)
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for device_id in device_ids:
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device = bash_wrapper(f"readlink -f {device_id}").strip()
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device_id_mapping[device].add(device_id)
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return device_id_mapping
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def calculate_device_menu_padding(
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devices: list[dict[str, str]], column: str, padding: int = 0
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) -> int:
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return max(len(device[column]) for device in devices) + padding
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def draw_device_ids(
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state: State,
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row_number: int,
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menu_start_x: int,
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std_screen: curses.window,
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menu_width: list[int],
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device_ids: set[str],
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) -> tuple[State, int]:
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for device_id in sorted(device_ids):
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row_number = row_number + 1
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if row_number == state.cursor.get_y() and state.cursor.get_x() in menu_width:
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std_screen.attron(curses.A_BOLD)
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if state.key == ord(" "):
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if device_id not in state.selected_device_ids:
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state.selected_device_ids.add(device_id)
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else:
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state.selected_device_ids.remove(device_id)
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if device_id in state.selected_device_ids:
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std_screen.attron(curses.color_pair(7))
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std_screen.addstr(row_number, menu_start_x, f" {device_id}")
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std_screen.attroff(curses.color_pair(7))
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std_screen.attroff(curses.A_BOLD)
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return state, row_number
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def draw_device_menu(
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std_screen: curses.window,
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devices: list[dict[str, str]],
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device_id_mapping: dict[str, set[str]],
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state: State,
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menu_start_y: int = 0,
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menu_start_x: int = 0,
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) -> State:
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"""draw the device menu and handle user input
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Args:
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std_screen (curses.window): the curses window to draw on
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devices (list[dict[str, str]]): the list of devices to draw
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device_id_mapping (dict[str, set[str]]): the list of device ids to draw
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state (State): the state object to update
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menu_start_y (int, optional): the y position to start drawing the menu. Defaults to 0.
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menu_start_x (int, optional): the x position to start drawing the menu. Defaults to 0.
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Returns:
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State: the updated state object
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"""
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padding = 2
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name_padding = calculate_device_menu_padding(devices, "name", padding)
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size_padding = calculate_device_menu_padding(devices, "size", padding)
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type_padding = calculate_device_menu_padding(devices, "type", padding)
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mountpoints_padding = calculate_device_menu_padding(devices, "mountpoints", padding)
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device_header = f"{'Name':{name_padding}}{'Size':{size_padding}}{'Type':{type_padding}}{'Mountpoints':{mountpoints_padding}}"
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menu_width = range(menu_start_x, len(device_header) + menu_start_x)
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std_screen.addstr(menu_start_y, menu_start_x, device_header, curses.color_pair(5))
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devises_list_start = menu_start_y + 1
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row_number = devises_list_start
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for device in devices:
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row_number = row_number + 1
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device_name = device["name"]
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device_row = (
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f"{device_name:{name_padding}}"
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f"{device['size']:{size_padding}}"
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f"{device['type']:{type_padding}}"
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f"{device['mountpoints']:{mountpoints_padding}}"
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)
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std_screen.addstr(row_number, menu_start_x, device_row)
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state, row_number = draw_device_ids(
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state=state,
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row_number=row_number,
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menu_start_x=menu_start_x,
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std_screen=std_screen,
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menu_width=menu_width,
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device_ids=device_id_mapping[device_name],
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)
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return state, row_number
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def debug_menu(std_screen: curses.window, key: int) -> None:
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height, width = std_screen.getmaxyx()
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width_height = "Width: {}, Height: {}".format(width, height)
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std_screen.addstr(height - 4, 0, width_height, curses.color_pair(5))
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key_pressed = f"Last key pressed: {key}"[: width - 1]
|
|
if key == 0:
|
|
key_pressed = "No key press detected..."[: width - 1]
|
|
std_screen.addstr(height - 3, 0, key_pressed)
|
|
|
|
for i in range(0, 8):
|
|
std_screen.addstr(height - 2, i * 3, f"{i}██", curses.color_pair(i))
|
|
|
|
|
|
def status_bar(
|
|
std_screen: curses.window,
|
|
cursor: Cursor,
|
|
width: int,
|
|
height: int,
|
|
) -> None:
|
|
std_screen.attron(curses.A_REVERSE)
|
|
std_screen.attron(curses.color_pair(3))
|
|
|
|
status_bar = (
|
|
f"Press 'q' to exit | STATUS BAR | Pos: {cursor.get_x()}, {cursor.get_y()}"
|
|
)
|
|
std_screen.addstr(height - 1, 0, status_bar)
|
|
std_screen.addstr(height - 1, len(status_bar), " " * (width - len(status_bar) - 1))
|
|
|
|
std_screen.attroff(curses.color_pair(3))
|
|
std_screen.attroff(curses.A_REVERSE)
|
|
|
|
|
|
def set_color() -> None:
|
|
curses.start_color()
|
|
curses.use_default_colors()
|
|
for i in range(0, curses.COLORS):
|
|
curses.init_pair(i + 1, i, -1)
|
|
|
|
|
|
def get_text_input(std_screen: curses.window, prompt: str, y: int, x: int) -> str:
|
|
curses.echo()
|
|
std_screen.addstr(y, x, prompt)
|
|
input_str = ""
|
|
while True:
|
|
key = std_screen.getch()
|
|
if key == ord("\n"):
|
|
break
|
|
elif key == 27: # ESC key
|
|
input_str = ""
|
|
break
|
|
elif key in (curses.KEY_BACKSPACE, ord("\b"), 127):
|
|
input_str = input_str[:-1]
|
|
std_screen.addstr(y, x + len(prompt), input_str + " ")
|
|
else:
|
|
input_str += chr(key)
|
|
std_screen.refresh()
|
|
curses.noecho()
|
|
return input_str
|
|
|
|
|
|
def swap_size_input(
|
|
std_screen: curses.window,
|
|
state: State,
|
|
swap_offset: int,
|
|
) -> State:
|
|
swap_size_text = "Swap size (GB): "
|
|
std_screen.addstr(swap_offset, 0, f"{swap_size_text}{state.swap_size}")
|
|
if state.key == ord("\n") and state.cursor.get_y() == swap_offset:
|
|
state.show_swap_input = True
|
|
|
|
if state.show_swap_input:
|
|
swap_size_str = get_text_input(std_screen, swap_size_text, swap_offset, 0)
|
|
try:
|
|
state.swap_size = int(swap_size_str)
|
|
state.show_swap_input = False
|
|
except ValueError:
|
|
std_screen.addstr(
|
|
swap_offset, 0, "Invalid input. Press any key to continue."
|
|
)
|
|
std_screen.getch()
|
|
state.show_swap_input = False
|
|
|
|
return state
|
|
|
|
|
|
def reserve_size_input(
|
|
std_screen: curses.window,
|
|
state: State,
|
|
reserve_offset: int,
|
|
) -> State:
|
|
reserve_size_text = "reserve size (GB): "
|
|
std_screen.addstr(reserve_offset, 0, f"{reserve_size_text}{state.reserve_size}")
|
|
if state.key == ord("\n") and state.cursor.get_y() == reserve_offset:
|
|
state.show_reserve_input = True
|
|
|
|
if state.show_reserve_input:
|
|
reserve_size_str = get_text_input(
|
|
std_screen, reserve_size_text, reserve_offset, 0
|
|
)
|
|
try:
|
|
state.reserve_size = int(reserve_size_str)
|
|
state.show_reserve_input = False
|
|
except ValueError:
|
|
std_screen.addstr(
|
|
reserve_offset, 0, "Invalid input. Press any key to continue."
|
|
)
|
|
std_screen.getch()
|
|
state.show_reserve_input = False
|
|
|
|
return state
|
|
|
|
|
|
def draw_menu(std_screen: curses.window) -> State:
|
|
"""draw the menu and handle user input
|
|
Args:
|
|
std_screen (curses.window): the curses window to draw on
|
|
Returns:
|
|
State: the state object
|
|
"""
|
|
# Clear and refresh the screen for a blank canvas
|
|
std_screen.clear()
|
|
std_screen.refresh()
|
|
|
|
set_color()
|
|
|
|
state = State()
|
|
|
|
devices = get_devices()
|
|
|
|
device_id_mapping = get_device_id_mapping()
|
|
|
|
# Loop where k is the last character pressed
|
|
while state.key != ord("q"):
|
|
std_screen.clear()
|
|
height, width = std_screen.getmaxyx()
|
|
|
|
state.cursor.set_height(height)
|
|
state.cursor.set_width(width)
|
|
|
|
state.cursor.navigation(state.key)
|
|
|
|
state, device_menu_size = draw_device_menu(
|
|
std_screen=std_screen,
|
|
state=state,
|
|
devices=devices,
|
|
device_id_mapping=device_id_mapping,
|
|
)
|
|
|
|
swap_offset = device_menu_size + 2
|
|
|
|
swap_size_input(
|
|
std_screen=std_screen,
|
|
state=state,
|
|
swap_offset=swap_offset,
|
|
)
|
|
reserve_size_input(
|
|
std_screen=std_screen,
|
|
state=state,
|
|
reserve_offset=swap_offset + 1,
|
|
)
|
|
|
|
status_bar(std_screen, state.cursor, width, height)
|
|
|
|
debug_menu(std_screen, state.key)
|
|
|
|
std_screen.move(state.cursor.get_y(), state.cursor.get_x())
|
|
|
|
std_screen.refresh()
|
|
|
|
state.key = std_screen.getch()
|
|
|
|
return state
|
|
|
|
|
|
def main() -> None:
|
|
configure_logger("DEBUG")
|
|
|
|
state = curses.wrapper(draw_menu)
|
|
|
|
encrypt_key = getenv("ENCRYPT_KEY")
|
|
|
|
logging.info("installing_nixos")
|
|
logging.info(f"disks: {state.selected_device_ids}")
|
|
logging.info(f"swap_size: {state.swap_size}")
|
|
logging.info(f"reserve: {state.reserve_size}")
|
|
logging.info(f"encrypted: {bool(encrypt_key)}")
|
|
|
|
sleep(3)
|
|
|
|
installer(
|
|
disks=state.get_selected_devices(),
|
|
swap_size=state.swap_size,
|
|
reserve=state.reserve_size,
|
|
encrypt_key=encrypt_key,
|
|
)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|