mirror of
https://github.com/NixOS/nixpkgs.git
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8ab2f09522
The virtualisation.directBoot.initrd option was added for netboot
images, but the assertion to check directBoot enabled if it was used
caused an infinite recursion if it was. Minimal reproduction:
import nixos/tests/make-test-python.nix ({ pkgs, ... }: {
name = "";
nodes = {
machine = { config, ...}: {
imports = [ nixos/modules/installer/netboot/netboot-minimal.nix ];
virtualisation.directBoot = {
enable = true;
initrd = "${config.system.build.netbootRamdisk}/${config.system.boot.loader.initrdFile}";
};
};
};
testScript = "";
}) {}
The fix is to swap the two conditions, so that cfg.directBoot.enable
is checked first, and the initrd comparision will be short circuited.
This wasn't noticed during review because in earlier versions of the
virtualisation.directBoot patch, the assertion was accidentally in the
conditional above, so wasn't evaluated unless port forwarding was in
use.
1334 lines
48 KiB
Nix
1334 lines
48 KiB
Nix
# This module creates a virtual machine from the NixOS configuration.
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# Building the `config.system.build.vm' attribute gives you a command
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# that starts a KVM/QEMU VM running the NixOS configuration defined in
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# `config'. By default, the Nix store is shared read-only with the
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# host, which makes (re)building VMs very efficient.
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{ config, lib, pkgs, options, ... }:
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with lib;
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let
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qemu-common = import ../../lib/qemu-common.nix { inherit lib pkgs; };
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cfg = config.virtualisation;
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opt = options.virtualisation;
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qemu = cfg.qemu.package;
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hostPkgs = cfg.host.pkgs;
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consoles = lib.concatMapStringsSep " " (c: "console=${c}") cfg.qemu.consoles;
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driveOpts = { ... }: {
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options = {
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file = mkOption {
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type = types.str;
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description = lib.mdDoc "The file image used for this drive.";
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};
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driveExtraOpts = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = lib.mdDoc "Extra options passed to drive flag.";
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};
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deviceExtraOpts = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = lib.mdDoc "Extra options passed to device flag.";
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};
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name = mkOption {
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type = types.nullOr types.str;
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default = null;
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description =
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lib.mdDoc "A name for the drive. Must be unique in the drives list. Not passed to qemu.";
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};
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};
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};
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selectPartitionTableLayout = { useEFIBoot, useDefaultFilesystems }:
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if useDefaultFilesystems then
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if useEFIBoot then "efi" else "legacy"
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else "none";
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driveCmdline = idx: { file, driveExtraOpts, deviceExtraOpts, ... }:
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let
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drvId = "drive${toString idx}";
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mkKeyValue = generators.mkKeyValueDefault {} "=";
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mkOpts = opts: concatStringsSep "," (mapAttrsToList mkKeyValue opts);
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driveOpts = mkOpts (driveExtraOpts // {
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index = idx;
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id = drvId;
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"if" = "none";
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inherit file;
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});
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deviceOpts = mkOpts (deviceExtraOpts // {
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drive = drvId;
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});
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device =
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if cfg.qemu.diskInterface == "scsi" then
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"-device lsi53c895a -device scsi-hd,${deviceOpts}"
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else
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"-device virtio-blk-pci,${deviceOpts}";
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in
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"-drive ${driveOpts} ${device}";
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drivesCmdLine = drives: concatStringsSep "\\\n " (imap1 driveCmdline drives);
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# Shell script to start the VM.
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startVM =
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''
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#! ${hostPkgs.runtimeShell}
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export PATH=${makeBinPath [ hostPkgs.coreutils ]}''${PATH:+:}$PATH
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set -e
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# Create an empty ext4 filesystem image. A filesystem image does not
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# contain a partition table but just a filesystem.
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createEmptyFilesystemImage() {
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local name=$1
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local size=$2
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local temp=$(mktemp)
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${qemu}/bin/qemu-img create -f raw "$temp" "$size"
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${hostPkgs.e2fsprogs}/bin/mkfs.ext4 -L ${rootFilesystemLabel} "$temp"
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${qemu}/bin/qemu-img convert -f raw -O qcow2 "$temp" "$name"
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rm "$temp"
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}
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NIX_DISK_IMAGE=$(readlink -f "''${NIX_DISK_IMAGE:-${toString config.virtualisation.diskImage}}") || test -z "$NIX_DISK_IMAGE"
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if test -n "$NIX_DISK_IMAGE" && ! test -e "$NIX_DISK_IMAGE"; then
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echo "Disk image do not exist, creating the virtualisation disk image..."
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${if (cfg.useBootLoader && cfg.useDefaultFilesystems) then ''
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# Create a writable qcow2 image using the systemImage as a backing
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# image.
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# CoW prevent size to be attributed to an image.
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# FIXME: raise this issue to upstream.
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${qemu}/bin/qemu-img create \
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-f qcow2 \
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-b ${systemImage}/nixos.qcow2 \
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-F qcow2 \
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"$NIX_DISK_IMAGE"
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'' else if cfg.useDefaultFilesystems then ''
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createEmptyFilesystemImage "$NIX_DISK_IMAGE" "${toString cfg.diskSize}M"
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'' else ''
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# Create an empty disk image without a filesystem.
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${qemu}/bin/qemu-img create -f qcow2 "$NIX_DISK_IMAGE" "${toString cfg.diskSize}M"
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''
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}
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echo "Virtualisation disk image created."
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fi
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# Create a directory for storing temporary data of the running VM.
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if [ -z "$TMPDIR" ] || [ -z "$USE_TMPDIR" ]; then
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TMPDIR=$(mktemp -d nix-vm.XXXXXXXXXX --tmpdir)
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fi
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${lib.optionalString (cfg.useNixStoreImage)
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(if cfg.writableStore
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then ''
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# Create a writable copy/snapshot of the store image.
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${qemu}/bin/qemu-img create -f qcow2 -F qcow2 -b ${storeImage}/nixos.qcow2 "$TMPDIR"/store.img
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''
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else ''
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(
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cd ${builtins.storeDir}
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${hostPkgs.erofs-utils}/bin/mkfs.erofs \
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--force-uid=0 \
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--force-gid=0 \
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-L ${nixStoreFilesystemLabel} \
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-U eb176051-bd15-49b7-9e6b-462e0b467019 \
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-T 0 \
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--exclude-regex="$(
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<${hostPkgs.closureInfo { rootPaths = [ config.system.build.toplevel regInfo ]; }}/store-paths \
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sed -e 's^.*/^^g' \
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| cut -c -10 \
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| ${hostPkgs.python3}/bin/python ${./includes-to-excludes.py} )" \
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"$TMPDIR"/store.img \
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. \
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</dev/null >/dev/null
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)
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''
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)
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}
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# Create a directory for exchanging data with the VM.
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mkdir -p "$TMPDIR/xchg"
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${lib.optionalString cfg.useHostCerts
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''
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mkdir -p "$TMPDIR/certs"
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if [ -e "$NIX_SSL_CERT_FILE" ]; then
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cp -L "$NIX_SSL_CERT_FILE" "$TMPDIR"/certs/ca-certificates.crt
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else
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echo \$NIX_SSL_CERT_FILE should point to a valid file if virtualisation.useHostCerts is enabled.
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fi
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''}
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${lib.optionalString cfg.useEFIBoot
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''
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# Expose EFI variables, it's useful even when we are not using a bootloader (!).
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# We might be interested in having EFI variable storage present even if we aren't booting via UEFI, hence
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# no guard against `useBootLoader`. Examples:
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# - testing PXE boot or other EFI applications
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# - directbooting LinuxBoot, which `kexec()s` into a UEFI environment that can boot e.g. Windows
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NIX_EFI_VARS=$(readlink -f "''${NIX_EFI_VARS:-${config.system.name}-efi-vars.fd}")
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# VM needs writable EFI vars
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if ! test -e "$NIX_EFI_VARS"; then
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${if cfg.useBootLoader then
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# We still need the EFI var from the make-disk-image derivation
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# because our "switch-to-configuration" process might
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# write into it and we want to keep this data.
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''cp ${systemImage}/efi-vars.fd "$NIX_EFI_VARS"''
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else
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''cp ${cfg.efi.variables} "$NIX_EFI_VARS"''
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}
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chmod 0644 "$NIX_EFI_VARS"
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fi
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''}
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${lib.optionalString cfg.tpm.enable ''
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NIX_SWTPM_DIR=$(readlink -f "''${NIX_SWTPM_DIR:-${config.system.name}-swtpm}")
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mkdir -p "$NIX_SWTPM_DIR"
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${lib.getExe cfg.tpm.package} \
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socket \
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--tpmstate dir="$NIX_SWTPM_DIR" \
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--ctrl type=unixio,path="$NIX_SWTPM_DIR"/socket,terminate \
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--pid file="$NIX_SWTPM_DIR"/pid --daemon \
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--tpm2 \
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--log file="$NIX_SWTPM_DIR"/stdout,level=6
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# Enable `fdflags` builtin in Bash
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# We will need it to perform surgical modification of the file descriptor
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# passed in the coprocess to remove `FD_CLOEXEC`, i.e. close the file descriptor
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# on exec.
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# If let alone, it will trigger the coprocess to read EOF when QEMU is `exec`
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# at the end of this script. To work around that, we will just clear
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# the `FD_CLOEXEC` bits as a first step.
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enable -f ${hostPkgs.bash}/lib/bash/fdflags fdflags
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# leave a dangling subprocess because the swtpm ctrl socket has
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# "terminate" when the last connection disconnects, it stops swtpm.
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# When qemu stops, or if the main shell process ends, the coproc will
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# get signaled by virtue of the pipe between main and coproc ending.
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# Which in turns triggers a socat connect-disconnect to swtpm which
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# will stop it.
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coproc waitingswtpm {
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read || :
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echo "" | ${lib.getExe hostPkgs.socat} STDIO UNIX-CONNECT:"$NIX_SWTPM_DIR"/socket
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}
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# Clear `FD_CLOEXEC` on the coprocess' file descriptor stdin.
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fdflags -s-cloexec ''${waitingswtpm[1]}
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''}
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cd "$TMPDIR"
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${lib.optionalString (cfg.emptyDiskImages != []) "idx=0"}
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${flip concatMapStrings cfg.emptyDiskImages (size: ''
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if ! test -e "empty$idx.qcow2"; then
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${qemu}/bin/qemu-img create -f qcow2 "empty$idx.qcow2" "${toString size}M"
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fi
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idx=$((idx + 1))
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'')}
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# Start QEMU.
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exec ${qemu-common.qemuBinary qemu} \
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-name ${config.system.name} \
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-m ${toString config.virtualisation.memorySize} \
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-smp ${toString config.virtualisation.cores} \
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-device virtio-rng-pci \
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${concatStringsSep " " config.virtualisation.qemu.networkingOptions} \
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${concatStringsSep " \\\n "
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(mapAttrsToList
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(tag: share: "-virtfs local,path=${share.source},security_model=none,mount_tag=${tag}")
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config.virtualisation.sharedDirectories)} \
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${drivesCmdLine config.virtualisation.qemu.drives} \
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${concatStringsSep " \\\n " config.virtualisation.qemu.options} \
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$QEMU_OPTS \
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"$@"
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'';
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regInfo = hostPkgs.closureInfo { rootPaths = config.virtualisation.additionalPaths; };
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# Use well-defined and persistent filesystem labels to identify block devices.
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rootFilesystemLabel = "nixos";
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espFilesystemLabel = "ESP"; # Hard-coded by make-disk-image.nix
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nixStoreFilesystemLabel = "nix-store";
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# The root drive is a raw disk which does not necessarily contain a
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# filesystem or partition table. It thus cannot be identified via the typical
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# persistent naming schemes (e.g. /dev/disk/by-{label, uuid, partlabel,
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# partuuid}. Instead, supply a well-defined and persistent serial attribute
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# via QEMU. Inside the running system, the disk can then be identified via
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# the /dev/disk/by-id scheme.
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rootDriveSerialAttr = "root";
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# System image is akin to a complete NixOS install with
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# a boot partition and root partition.
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systemImage = import ../../lib/make-disk-image.nix {
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inherit pkgs config lib;
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additionalPaths = [ regInfo ];
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format = "qcow2";
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onlyNixStore = false;
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label = rootFilesystemLabel;
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partitionTableType = selectPartitionTableLayout { inherit (cfg) useDefaultFilesystems useEFIBoot; };
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# Bootloader should be installed on the system image only if we are booting through bootloaders.
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# Though, if a user is not using our default filesystems, it is possible to not have any ESP
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# or a strange partition table that's incompatible with GRUB configuration.
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# As a consequence, this may lead to disk image creation failures.
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# To avoid this, we prefer to let the user find out about how to install the bootloader on its ESP/disk.
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# Usually, this can be through building your own disk image.
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# TODO: If a user is interested into a more fine grained heuristic for `installBootLoader`
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# by examining the actual contents of `cfg.fileSystems`, please send a PR.
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installBootLoader = cfg.useBootLoader && cfg.useDefaultFilesystems;
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touchEFIVars = cfg.useEFIBoot;
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diskSize = "auto";
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additionalSpace = "0M";
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copyChannel = false;
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OVMF = cfg.efi.OVMF;
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};
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storeImage = import ../../lib/make-disk-image.nix {
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name = "nix-store-image";
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inherit pkgs config lib;
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additionalPaths = [ regInfo ];
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format = "qcow2";
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onlyNixStore = true;
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label = nixStoreFilesystemLabel;
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partitionTableType = "none";
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installBootLoader = false;
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touchEFIVars = false;
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diskSize = "auto";
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additionalSpace = "0M";
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copyChannel = false;
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};
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in
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{
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imports = [
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../profiles/qemu-guest.nix
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(mkRenamedOptionModule [ "virtualisation" "pathsInNixDB" ] [ "virtualisation" "additionalPaths" ])
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(mkRemovedOptionModule [ "virtualisation" "bootDevice" ] "This option was renamed to `virtualisation.rootDevice`, as it was incorrectly named and misleading. Take the time to review what you want to do and look at the new options like `virtualisation.{bootLoaderDevice, bootPartition}`, open an issue in case of issues.")
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(mkRemovedOptionModule [ "virtualisation" "efiVars" ] "This option was removed, it is possible to provide a template UEFI variable with `virtualisation.efi.variables` ; if this option is important to you, open an issue")
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(mkRemovedOptionModule [ "virtualisation" "persistBootDevice" ] "Boot device is always persisted if you use a bootloader through the root disk image ; if this does not work for your usecase, please examine carefully what `virtualisation.{bootDevice, rootDevice, bootPartition}` options offer you and open an issue explaining your need.`")
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];
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options = {
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virtualisation.fileSystems = options.fileSystems;
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virtualisation.memorySize =
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mkOption {
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type = types.ints.positive;
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default = 1024;
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description =
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lib.mdDoc ''
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The memory size in megabytes of the virtual machine.
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'';
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};
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virtualisation.msize =
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mkOption {
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type = types.ints.positive;
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default = 16384;
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description =
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lib.mdDoc ''
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The msize (maximum packet size) option passed to 9p file systems, in
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bytes. Increasing this should increase performance significantly,
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at the cost of higher RAM usage.
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'';
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};
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virtualisation.diskSize =
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mkOption {
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type = types.nullOr types.ints.positive;
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default = 1024;
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description =
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lib.mdDoc ''
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The disk size in megabytes of the virtual machine.
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'';
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};
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virtualisation.diskImage =
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mkOption {
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type = types.nullOr types.str;
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default = "./${config.system.name}.qcow2";
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defaultText = literalExpression ''"./''${config.system.name}.qcow2"'';
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description =
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lib.mdDoc ''
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Path to the disk image containing the root filesystem.
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The image will be created on startup if it does not
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exist.
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If null, a tmpfs will be used as the root filesystem and
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the VM's state will not be persistent.
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'';
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};
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virtualisation.bootLoaderDevice =
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mkOption {
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type = types.path;
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default = "/dev/disk/by-id/virtio-${rootDriveSerialAttr}";
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defaultText = literalExpression ''/dev/disk/by-id/virtio-${rootDriveSerialAttr}'';
|
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example = "/dev/disk/by-id/virtio-boot-loader-device";
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description =
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lib.mdDoc ''
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The path (inside th VM) to the device to boot from when legacy booting.
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'';
|
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};
|
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virtualisation.bootPartition =
|
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mkOption {
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type = types.nullOr types.path;
|
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default = if cfg.useEFIBoot then "/dev/disk/by-label/${espFilesystemLabel}" else null;
|
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defaultText = literalExpression ''if cfg.useEFIBoot then "/dev/disk/by-label/${espFilesystemLabel}" else null'';
|
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example = "/dev/disk/by-label/esp";
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description =
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lib.mdDoc ''
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The path (inside the VM) to the device containing the EFI System Partition (ESP).
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If you are *not* booting from a UEFI firmware, this value is, by
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default, `null`. The ESP is mounted under `/boot`.
|
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'';
|
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};
|
|
|
|
virtualisation.rootDevice =
|
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mkOption {
|
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type = types.nullOr types.path;
|
|
default = "/dev/disk/by-label/${rootFilesystemLabel}";
|
|
defaultText = literalExpression ''/dev/disk/by-label/${rootFilesystemLabel}'';
|
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example = "/dev/disk/by-label/nixos";
|
|
description =
|
|
lib.mdDoc ''
|
|
The path (inside the VM) to the device containing the root filesystem.
|
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'';
|
|
};
|
|
|
|
virtualisation.emptyDiskImages =
|
|
mkOption {
|
|
type = types.listOf types.ints.positive;
|
|
default = [];
|
|
description =
|
|
lib.mdDoc ''
|
|
Additional disk images to provide to the VM. The value is
|
|
a list of size in megabytes of each disk. These disks are
|
|
writeable by the VM.
|
|
'';
|
|
};
|
|
|
|
virtualisation.graphics =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description =
|
|
lib.mdDoc ''
|
|
Whether to run QEMU with a graphics window, or in nographic mode.
|
|
Serial console will be enabled on both settings, but this will
|
|
change the preferred console.
|
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'';
|
|
};
|
|
|
|
virtualisation.resolution =
|
|
mkOption {
|
|
type = options.services.xserver.resolutions.type.nestedTypes.elemType;
|
|
default = { x = 1024; y = 768; };
|
|
description =
|
|
lib.mdDoc ''
|
|
The resolution of the virtual machine display.
|
|
'';
|
|
};
|
|
|
|
virtualisation.cores =
|
|
mkOption {
|
|
type = types.ints.positive;
|
|
default = 1;
|
|
description =
|
|
lib.mdDoc ''
|
|
Specify the number of cores the guest is permitted to use.
|
|
The number can be higher than the available cores on the
|
|
host system.
|
|
'';
|
|
};
|
|
|
|
virtualisation.sharedDirectories =
|
|
mkOption {
|
|
type = types.attrsOf
|
|
(types.submodule {
|
|
options.source = mkOption {
|
|
type = types.str;
|
|
description = lib.mdDoc "The path of the directory to share, can be a shell variable";
|
|
};
|
|
options.target = mkOption {
|
|
type = types.path;
|
|
description = lib.mdDoc "The mount point of the directory inside the virtual machine";
|
|
};
|
|
});
|
|
default = { };
|
|
example = {
|
|
my-share = { source = "/path/to/be/shared"; target = "/mnt/shared"; };
|
|
};
|
|
description =
|
|
lib.mdDoc ''
|
|
An attributes set of directories that will be shared with the
|
|
virtual machine using VirtFS (9P filesystem over VirtIO).
|
|
The attribute name will be used as the 9P mount tag.
|
|
'';
|
|
};
|
|
|
|
virtualisation.additionalPaths =
|
|
mkOption {
|
|
type = types.listOf types.path;
|
|
default = [];
|
|
description =
|
|
lib.mdDoc ''
|
|
A list of paths whose closure should be made available to
|
|
the VM.
|
|
|
|
When 9p is used, the closure is registered in the Nix
|
|
database in the VM. All other paths in the host Nix store
|
|
appear in the guest Nix store as well, but are considered
|
|
garbage (because they are not registered in the Nix
|
|
database of the guest).
|
|
|
|
When {option}`virtualisation.useNixStoreImage` is
|
|
set, the closure is copied to the Nix store image.
|
|
'';
|
|
};
|
|
|
|
virtualisation.forwardPorts = mkOption {
|
|
type = types.listOf
|
|
(types.submodule {
|
|
options.from = mkOption {
|
|
type = types.enum [ "host" "guest" ];
|
|
default = "host";
|
|
description =
|
|
lib.mdDoc ''
|
|
Controls the direction in which the ports are mapped:
|
|
|
|
- `"host"` means traffic from the host ports
|
|
is forwarded to the given guest port.
|
|
- `"guest"` means traffic from the guest ports
|
|
is forwarded to the given host port.
|
|
'';
|
|
};
|
|
options.proto = mkOption {
|
|
type = types.enum [ "tcp" "udp" ];
|
|
default = "tcp";
|
|
description = lib.mdDoc "The protocol to forward.";
|
|
};
|
|
options.host.address = mkOption {
|
|
type = types.str;
|
|
default = "";
|
|
description = lib.mdDoc "The IPv4 address of the host.";
|
|
};
|
|
options.host.port = mkOption {
|
|
type = types.port;
|
|
description = lib.mdDoc "The host port to be mapped.";
|
|
};
|
|
options.guest.address = mkOption {
|
|
type = types.str;
|
|
default = "";
|
|
description = lib.mdDoc "The IPv4 address on the guest VLAN.";
|
|
};
|
|
options.guest.port = mkOption {
|
|
type = types.port;
|
|
description = lib.mdDoc "The guest port to be mapped.";
|
|
};
|
|
});
|
|
default = [];
|
|
example = lib.literalExpression
|
|
''
|
|
[ # forward local port 2222 -> 22, to ssh into the VM
|
|
{ from = "host"; host.port = 2222; guest.port = 22; }
|
|
|
|
# forward local port 80 -> 10.0.2.10:80 in the VLAN
|
|
{ from = "guest";
|
|
guest.address = "10.0.2.10"; guest.port = 80;
|
|
host.address = "127.0.0.1"; host.port = 80;
|
|
}
|
|
]
|
|
'';
|
|
description =
|
|
lib.mdDoc ''
|
|
When using the SLiRP user networking (default), this option allows to
|
|
forward ports to/from the host/guest.
|
|
|
|
::: {.warning}
|
|
If the NixOS firewall on the virtual machine is enabled, you also
|
|
have to open the guest ports to enable the traffic between host and
|
|
guest.
|
|
:::
|
|
|
|
::: {.note}
|
|
Currently QEMU supports only IPv4 forwarding.
|
|
:::
|
|
'';
|
|
};
|
|
|
|
virtualisation.restrictNetwork =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
example = true;
|
|
description =
|
|
lib.mdDoc ''
|
|
If this option is enabled, the guest will be isolated, i.e. it will
|
|
not be able to contact the host and no guest IP packets will be
|
|
routed over the host to the outside. This option does not affect
|
|
any explicitly set forwarding rules.
|
|
'';
|
|
};
|
|
|
|
virtualisation.vlans =
|
|
mkOption {
|
|
type = types.listOf types.ints.unsigned;
|
|
default = if config.virtualisation.interfaces == {} then [ 1 ] else [ ];
|
|
defaultText = lib.literalExpression ''if config.virtualisation.interfaces == {} then [ 1 ] else [ ]'';
|
|
example = [ 1 2 ];
|
|
description =
|
|
lib.mdDoc ''
|
|
Virtual networks to which the VM is connected. Each
|
|
number «N» in this list causes
|
|
the VM to have a virtual Ethernet interface attached to a
|
|
separate virtual network on which it will be assigned IP
|
|
address
|
|
`192.168.«N».«M»`,
|
|
where «M» is the index of this VM
|
|
in the list of VMs.
|
|
'';
|
|
};
|
|
|
|
virtualisation.interfaces = mkOption {
|
|
default = {};
|
|
example = {
|
|
enp1s0.vlan = 1;
|
|
};
|
|
description = lib.mdDoc ''
|
|
Network interfaces to add to the VM.
|
|
'';
|
|
type = with types; attrsOf (submodule {
|
|
options = {
|
|
vlan = mkOption {
|
|
type = types.ints.unsigned;
|
|
description = lib.mdDoc ''
|
|
VLAN to which the network interface is connected.
|
|
'';
|
|
};
|
|
|
|
assignIP = mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = lib.mdDoc ''
|
|
Automatically assign an IP address to the network interface using the same scheme as
|
|
virtualisation.vlans.
|
|
'';
|
|
};
|
|
};
|
|
});
|
|
};
|
|
|
|
virtualisation.writableStore =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = cfg.mountHostNixStore;
|
|
defaultText = literalExpression "cfg.mountHostNixStore";
|
|
description =
|
|
lib.mdDoc ''
|
|
If enabled, the Nix store in the VM is made writable by
|
|
layering an overlay filesystem on top of the host's Nix
|
|
store.
|
|
|
|
By default, this is enabled if you mount a host Nix store.
|
|
'';
|
|
};
|
|
|
|
virtualisation.writableStoreUseTmpfs =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description =
|
|
lib.mdDoc ''
|
|
Use a tmpfs for the writable store instead of writing to the VM's
|
|
own filesystem.
|
|
'';
|
|
};
|
|
|
|
networking.primaryIPAddress =
|
|
mkOption {
|
|
type = types.str;
|
|
default = "";
|
|
internal = true;
|
|
description = lib.mdDoc "Primary IP address used in /etc/hosts.";
|
|
};
|
|
|
|
virtualisation.host.pkgs = mkOption {
|
|
type = options.nixpkgs.pkgs.type;
|
|
default = pkgs;
|
|
defaultText = literalExpression "pkgs";
|
|
example = literalExpression ''
|
|
import pkgs.path { system = "x86_64-darwin"; }
|
|
'';
|
|
description = lib.mdDoc ''
|
|
Package set to use for the host-specific packages of the VM runner.
|
|
Changing this to e.g. a Darwin package set allows running NixOS VMs on Darwin.
|
|
'';
|
|
};
|
|
|
|
virtualisation.qemu = {
|
|
package =
|
|
mkOption {
|
|
type = types.package;
|
|
default = if hostPkgs.stdenv.hostPlatform.qemuArch == pkgs.stdenv.hostPlatform.qemuArch then hostPkgs.qemu_kvm else hostPkgs.qemu;
|
|
defaultText = literalExpression "if hostPkgs.stdenv.hostPlatform.qemuArch == pkgs.stdenv.hostPlatform.qemuArch then config.virtualisation.host.pkgs.qemu_kvm else config.virtualisation.host.pkgs.qemu";
|
|
example = literalExpression "pkgs.qemu_test";
|
|
description = lib.mdDoc "QEMU package to use.";
|
|
};
|
|
|
|
options =
|
|
mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
example = [ "-vga std" ];
|
|
description = lib.mdDoc "Options passed to QEMU.";
|
|
};
|
|
|
|
consoles = mkOption {
|
|
type = types.listOf types.str;
|
|
default = let
|
|
consoles = [ "${qemu-common.qemuSerialDevice},115200n8" "tty0" ];
|
|
in if cfg.graphics then consoles else reverseList consoles;
|
|
example = [ "console=tty1" ];
|
|
description = lib.mdDoc ''
|
|
The output console devices to pass to the kernel command line via the
|
|
`console` parameter, the primary console is the last
|
|
item of this list.
|
|
|
|
By default it enables both serial console and
|
|
`tty0`. The preferred console (last one) is based on
|
|
the value of {option}`virtualisation.graphics`.
|
|
'';
|
|
};
|
|
|
|
networkingOptions =
|
|
mkOption {
|
|
type = types.listOf types.str;
|
|
default = [ ];
|
|
example = [
|
|
"-net nic,netdev=user.0,model=virtio"
|
|
"-netdev user,id=user.0,\${QEMU_NET_OPTS:+,$QEMU_NET_OPTS}"
|
|
];
|
|
description = lib.mdDoc ''
|
|
Networking-related command-line options that should be passed to qemu.
|
|
The default is to use userspace networking (SLiRP).
|
|
|
|
If you override this option, be advised to keep
|
|
''${QEMU_NET_OPTS:+,$QEMU_NET_OPTS} (as seen in the example)
|
|
to keep the default runtime behaviour.
|
|
'';
|
|
};
|
|
|
|
drives =
|
|
mkOption {
|
|
type = types.listOf (types.submodule driveOpts);
|
|
description = lib.mdDoc "Drives passed to qemu.";
|
|
};
|
|
|
|
diskInterface =
|
|
mkOption {
|
|
type = types.enum [ "virtio" "scsi" "ide" ];
|
|
default = "virtio";
|
|
example = "scsi";
|
|
description = lib.mdDoc "The interface used for the virtual hard disks.";
|
|
};
|
|
|
|
guestAgent.enable =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description = lib.mdDoc ''
|
|
Enable the Qemu guest agent.
|
|
'';
|
|
};
|
|
|
|
virtioKeyboard =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description = lib.mdDoc ''
|
|
Enable the virtio-keyboard device.
|
|
'';
|
|
};
|
|
};
|
|
|
|
virtualisation.useNixStoreImage =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description = lib.mdDoc ''
|
|
Build and use a disk image for the Nix store, instead of
|
|
accessing the host's one through 9p.
|
|
|
|
For applications which do a lot of reads from the store,
|
|
this can drastically improve performance, but at the cost of
|
|
disk space and image build time.
|
|
|
|
As an alternative, you can use a bootloader which will provide you
|
|
with a full NixOS system image containing a Nix store and
|
|
avoid mounting the host nix store through
|
|
{option}`virtualisation.mountHostNixStore`.
|
|
'';
|
|
};
|
|
|
|
virtualisation.mountHostNixStore =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = !cfg.useNixStoreImage && !cfg.useBootLoader;
|
|
defaultText = literalExpression "!cfg.useNixStoreImage && !cfg.useBootLoader";
|
|
description = lib.mdDoc ''
|
|
Mount the host Nix store as a 9p mount.
|
|
'';
|
|
};
|
|
|
|
virtualisation.directBoot = {
|
|
enable =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = !cfg.useBootLoader;
|
|
defaultText = "!cfg.useBootLoader";
|
|
description =
|
|
lib.mdDoc ''
|
|
If enabled, the virtual machine will boot directly into the kernel instead of through a bootloader. Other relevant parameters such as the initrd are also passed to QEMU.
|
|
|
|
If you want to test netboot, consider disabling this option.
|
|
|
|
This will not boot / reboot correctly into a system that has switched to a different configuration on disk.
|
|
|
|
This is enabled by default if you don't enable bootloaders, but you can still enable a bootloader if you need.
|
|
Read more about this feature: <https://qemu-project.gitlab.io/qemu/system/linuxboot.html>.
|
|
'';
|
|
};
|
|
initrd =
|
|
mkOption {
|
|
type = types.str;
|
|
default = "${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}";
|
|
defaultText = "\${config.system.build.initialRamdisk}/\${config.system.boot.loader.initrdFile}";
|
|
description =
|
|
lib.mdDoc ''
|
|
In direct boot situations, you may want to influence the initrd to load
|
|
to use your own customized payload.
|
|
|
|
This is useful if you want to test the netboot image without
|
|
testing the firmware or the loading part.
|
|
'';
|
|
};
|
|
};
|
|
|
|
virtualisation.useBootLoader =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description =
|
|
lib.mdDoc ''
|
|
Use a boot loader to boot the system.
|
|
This allows, among other things, testing the boot loader.
|
|
|
|
If disabled, the kernel and initrd are directly booted,
|
|
forgoing any bootloader.
|
|
'';
|
|
};
|
|
|
|
virtualisation.useEFIBoot =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description =
|
|
lib.mdDoc ''
|
|
If enabled, the virtual machine will provide a EFI boot
|
|
manager.
|
|
useEFIBoot is ignored if useBootLoader == false.
|
|
'';
|
|
};
|
|
|
|
virtualisation.efi = {
|
|
OVMF = mkOption {
|
|
type = types.package;
|
|
default = (pkgs.OVMF.override {
|
|
secureBoot = cfg.useSecureBoot;
|
|
}).fd;
|
|
defaultText = ''(pkgs.OVMF.override {
|
|
secureBoot = cfg.useSecureBoot;
|
|
}).fd'';
|
|
description =
|
|
lib.mdDoc "OVMF firmware package, defaults to OVMF configured with secure boot if needed.";
|
|
};
|
|
|
|
firmware = mkOption {
|
|
type = types.path;
|
|
default = cfg.efi.OVMF.firmware;
|
|
defaultText = literalExpression "cfg.efi.OVMF.firmware";
|
|
description =
|
|
lib.mdDoc ''
|
|
Firmware binary for EFI implementation, defaults to OVMF.
|
|
'';
|
|
};
|
|
|
|
variables = mkOption {
|
|
type = types.path;
|
|
default = cfg.efi.OVMF.variables;
|
|
defaultText = literalExpression "cfg.efi.OVMF.variables";
|
|
description =
|
|
lib.mdDoc ''
|
|
Platform-specific flash binary for EFI variables, implementation-dependent to the EFI firmware.
|
|
Defaults to OVMF.
|
|
'';
|
|
};
|
|
};
|
|
|
|
virtualisation.tpm = {
|
|
enable = mkEnableOption "a TPM device in the virtual machine with a driver, using swtpm.";
|
|
|
|
package = mkPackageOptionMD cfg.host.pkgs "swtpm" { };
|
|
|
|
deviceModel = mkOption {
|
|
type = types.str;
|
|
default = ({
|
|
"i686-linux" = "tpm-tis";
|
|
"x86_64-linux" = "tpm-tis";
|
|
"ppc64-linux" = "tpm-spapr";
|
|
"armv7-linux" = "tpm-tis-device";
|
|
"aarch64-linux" = "tpm-tis-device";
|
|
}.${pkgs.hostPlatform.system} or (throw "Unsupported system for TPM2 emulation in QEMU"));
|
|
defaultText = ''
|
|
Based on the guest platform Linux system:
|
|
|
|
- `tpm-tis` for (i686, x86_64)
|
|
- `tpm-spapr` for ppc64
|
|
- `tpm-tis-device` for (armv7, aarch64)
|
|
'';
|
|
example = "tpm-tis-device";
|
|
description = lib.mdDoc "QEMU device model for the TPM, uses the appropriate default based on th guest platform system and the package passed.";
|
|
};
|
|
};
|
|
|
|
virtualisation.useDefaultFilesystems =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = true;
|
|
description =
|
|
lib.mdDoc ''
|
|
If enabled, the boot disk of the virtual machine will be
|
|
formatted and mounted with the default filesystems for
|
|
testing. Swap devices and LUKS will be disabled.
|
|
|
|
If disabled, a root filesystem has to be specified and
|
|
formatted (for example in the initial ramdisk).
|
|
'';
|
|
};
|
|
|
|
virtualisation.useSecureBoot =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description =
|
|
lib.mdDoc ''
|
|
Enable Secure Boot support in the EFI firmware.
|
|
'';
|
|
};
|
|
|
|
virtualisation.bios =
|
|
mkOption {
|
|
type = types.nullOr types.package;
|
|
default = null;
|
|
description =
|
|
lib.mdDoc ''
|
|
An alternate BIOS (such as `qboot`) with which to start the VM.
|
|
Should contain a file named `bios.bin`.
|
|
If `null`, QEMU's builtin SeaBIOS will be used.
|
|
'';
|
|
};
|
|
|
|
virtualisation.useHostCerts =
|
|
mkOption {
|
|
type = types.bool;
|
|
default = false;
|
|
description =
|
|
lib.mdDoc ''
|
|
If enabled, when `NIX_SSL_CERT_FILE` is set on the host,
|
|
pass the CA certificates from the host to the VM.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
config = {
|
|
|
|
assertions =
|
|
lib.concatLists (lib.flip lib.imap cfg.forwardPorts (i: rule:
|
|
[
|
|
{ assertion = rule.from == "guest" -> rule.proto == "tcp";
|
|
message =
|
|
''
|
|
Invalid virtualisation.forwardPorts.<entry ${toString i}>.proto:
|
|
Guest forwarding supports only TCP connections.
|
|
'';
|
|
}
|
|
{ assertion = rule.from == "guest" -> lib.hasPrefix "10.0.2." rule.guest.address;
|
|
message =
|
|
''
|
|
Invalid virtualisation.forwardPorts.<entry ${toString i}>.guest.address:
|
|
The address must be in the default VLAN (10.0.2.0/24).
|
|
'';
|
|
}
|
|
])) ++ [
|
|
{ assertion = pkgs.stdenv.hostPlatform.is32bit -> cfg.memorySize < 2047;
|
|
message = ''
|
|
virtualisation.memorySize is above 2047, but qemu is only able to allocate 2047MB RAM on 32bit max.
|
|
'';
|
|
}
|
|
{ assertion = cfg.directBoot.enable || cfg.directBoot.initrd == options.virtualisation.directBoot.initrd.default;
|
|
message =
|
|
''
|
|
You changed the default of `virtualisation.directBoot.initrd` but you are not
|
|
using QEMU direct boot. This initrd will not be used in your current
|
|
boot configuration.
|
|
|
|
Either do not mutate `virtualisation.directBoot.initrd` or enable direct boot.
|
|
|
|
If you have a more advanced usecase, please open an issue or a pull request.
|
|
'';
|
|
}
|
|
];
|
|
|
|
warnings =
|
|
optional (
|
|
cfg.writableStore &&
|
|
cfg.useNixStoreImage &&
|
|
opt.writableStore.highestPrio > lib.modules.defaultOverridePriority)
|
|
''
|
|
You have enabled ${opt.useNixStoreImage} = true,
|
|
without setting ${opt.writableStore} = false.
|
|
|
|
This causes a store image to be written to the store, which is
|
|
costly, especially for the binary cache, and because of the need
|
|
for more frequent garbage collection.
|
|
|
|
If you really need this combination, you can set ${opt.writableStore}
|
|
explicitly to true, incur the cost and make this warning go away.
|
|
Otherwise, we recommend
|
|
|
|
${opt.writableStore} = false;
|
|
''
|
|
++ optional (cfg.directBoot.enable && cfg.useBootLoader)
|
|
''
|
|
You enabled direct boot and a bootloader, QEMU will not boot your bootloader, rendering
|
|
`useBootLoader` useless. You might want to disable one of those options.
|
|
'';
|
|
|
|
# In UEFI boot, we use a EFI-only partition table layout, thus GRUB will fail when trying to install
|
|
# legacy and UEFI. In order to avoid this, we have to put "nodev" to force UEFI-only installs.
|
|
# Otherwise, we set the proper bootloader device for this.
|
|
# FIXME: make a sense of this mess wrt to multiple ESP present in the system, probably use boot.efiSysMountpoint?
|
|
boot.loader.grub.device = mkVMOverride (if cfg.useEFIBoot then "nodev" else cfg.bootLoaderDevice);
|
|
boot.loader.grub.gfxmodeBios = with cfg.resolution; "${toString x}x${toString y}";
|
|
|
|
boot.initrd.kernelModules = optionals (cfg.useNixStoreImage && !cfg.writableStore) [ "erofs" ];
|
|
|
|
boot.loader.supportsInitrdSecrets = mkIf (!cfg.useBootLoader) (mkVMOverride false);
|
|
|
|
boot.initrd.postMountCommands = lib.mkIf (!config.boot.initrd.systemd.enable)
|
|
''
|
|
# Mark this as a NixOS machine.
|
|
mkdir -p $targetRoot/etc
|
|
echo -n > $targetRoot/etc/NIXOS
|
|
|
|
# Fix the permissions on /tmp.
|
|
chmod 1777 $targetRoot/tmp
|
|
|
|
mkdir -p $targetRoot/boot
|
|
|
|
${optionalString cfg.writableStore ''
|
|
echo "mounting overlay filesystem on /nix/store..."
|
|
mkdir -p -m 0755 $targetRoot/nix/.rw-store/store $targetRoot/nix/.rw-store/work $targetRoot/nix/store
|
|
mount -t overlay overlay $targetRoot/nix/store \
|
|
-o lowerdir=$targetRoot/nix/.ro-store,upperdir=$targetRoot/nix/.rw-store/store,workdir=$targetRoot/nix/.rw-store/work || fail
|
|
''}
|
|
'';
|
|
|
|
systemd.tmpfiles.rules = lib.mkIf config.boot.initrd.systemd.enable [
|
|
"f /etc/NIXOS 0644 root root -"
|
|
"d /boot 0644 root root -"
|
|
];
|
|
|
|
# After booting, register the closure of the paths in
|
|
# `virtualisation.additionalPaths' in the Nix database in the VM. This
|
|
# allows Nix operations to work in the VM. The path to the
|
|
# registration file is passed through the kernel command line to
|
|
# allow `system.build.toplevel' to be included. (If we had a direct
|
|
# reference to ${regInfo} here, then we would get a cyclic
|
|
# dependency.)
|
|
boot.postBootCommands = lib.mkIf config.nix.enable
|
|
''
|
|
if [[ "$(cat /proc/cmdline)" =~ regInfo=([^ ]*) ]]; then
|
|
${config.nix.package.out}/bin/nix-store --load-db < ''${BASH_REMATCH[1]}
|
|
fi
|
|
'';
|
|
|
|
boot.initrd.availableKernelModules =
|
|
optional cfg.writableStore "overlay"
|
|
++ optional (cfg.qemu.diskInterface == "scsi") "sym53c8xx"
|
|
++ optional (cfg.tpm.enable) "tpm_tis";
|
|
|
|
virtualisation.additionalPaths = [ config.system.build.toplevel ];
|
|
|
|
virtualisation.sharedDirectories = {
|
|
nix-store = mkIf cfg.mountHostNixStore {
|
|
source = builtins.storeDir;
|
|
target = "/nix/store";
|
|
};
|
|
xchg = {
|
|
source = ''"$TMPDIR"/xchg'';
|
|
target = "/tmp/xchg";
|
|
};
|
|
shared = {
|
|
source = ''"''${SHARED_DIR:-$TMPDIR/xchg}"'';
|
|
target = "/tmp/shared";
|
|
};
|
|
certs = mkIf cfg.useHostCerts {
|
|
source = ''"$TMPDIR"/certs'';
|
|
target = "/etc/ssl/certs";
|
|
};
|
|
};
|
|
|
|
security.pki.installCACerts = mkIf cfg.useHostCerts false;
|
|
|
|
virtualisation.qemu.networkingOptions =
|
|
let
|
|
forwardingOptions = flip concatMapStrings cfg.forwardPorts
|
|
({ proto, from, host, guest }:
|
|
if from == "host"
|
|
then "hostfwd=${proto}:${host.address}:${toString host.port}-" +
|
|
"${guest.address}:${toString guest.port},"
|
|
else "'guestfwd=${proto}:${guest.address}:${toString guest.port}-" +
|
|
"cmd:${pkgs.netcat}/bin/nc ${host.address} ${toString host.port}',"
|
|
);
|
|
restrictNetworkOption = lib.optionalString cfg.restrictNetwork "restrict=on,";
|
|
in
|
|
[
|
|
"-net nic,netdev=user.0,model=virtio"
|
|
"-netdev user,id=user.0,${forwardingOptions}${restrictNetworkOption}\"$QEMU_NET_OPTS\""
|
|
];
|
|
|
|
virtualisation.qemu.options = mkMerge [
|
|
(mkIf cfg.qemu.virtioKeyboard [
|
|
"-device virtio-keyboard"
|
|
])
|
|
(mkIf pkgs.stdenv.hostPlatform.isx86 [
|
|
"-usb" "-device usb-tablet,bus=usb-bus.0"
|
|
])
|
|
(mkIf pkgs.stdenv.hostPlatform.isAarch [
|
|
"-device virtio-gpu-pci" "-device usb-ehci,id=usb0" "-device usb-kbd" "-device usb-tablet"
|
|
])
|
|
(let
|
|
alphaNumericChars = lowerChars ++ upperChars ++ (map toString (range 0 9));
|
|
# Replace all non-alphanumeric characters with underscores
|
|
sanitizeShellIdent = s: concatMapStrings (c: if builtins.elem c alphaNumericChars then c else "_") (stringToCharacters s);
|
|
in mkIf cfg.directBoot.enable [
|
|
"-kernel \${NIXPKGS_QEMU_KERNEL_${sanitizeShellIdent config.system.name}:-${config.system.build.toplevel}/kernel}"
|
|
"-initrd ${cfg.directBoot.initrd}"
|
|
''-append "$(cat ${config.system.build.toplevel}/kernel-params) init=${config.system.build.toplevel}/init regInfo=${regInfo}/registration ${consoles} $QEMU_KERNEL_PARAMS"''
|
|
])
|
|
(mkIf cfg.useEFIBoot [
|
|
"-drive if=pflash,format=raw,unit=0,readonly=on,file=${cfg.efi.firmware}"
|
|
"-drive if=pflash,format=raw,unit=1,readonly=off,file=$NIX_EFI_VARS"
|
|
])
|
|
(mkIf (cfg.bios != null) [
|
|
"-bios ${cfg.bios}/bios.bin"
|
|
])
|
|
(mkIf (!cfg.graphics) [
|
|
"-nographic"
|
|
])
|
|
(mkIf (cfg.tpm.enable) [
|
|
"-chardev socket,id=chrtpm,path=\"$NIX_SWTPM_DIR\"/socket"
|
|
"-tpmdev emulator,id=tpm_dev_0,chardev=chrtpm"
|
|
"-device ${cfg.tpm.deviceModel},tpmdev=tpm_dev_0"
|
|
])
|
|
];
|
|
|
|
virtualisation.qemu.drives = mkMerge [
|
|
(mkIf (cfg.diskImage != null) [{
|
|
name = "root";
|
|
file = ''"$NIX_DISK_IMAGE"'';
|
|
driveExtraOpts.cache = "writeback";
|
|
driveExtraOpts.werror = "report";
|
|
deviceExtraOpts.bootindex = "1";
|
|
deviceExtraOpts.serial = rootDriveSerialAttr;
|
|
}])
|
|
(mkIf cfg.useNixStoreImage [{
|
|
name = "nix-store";
|
|
file = ''"$TMPDIR"/store.img'';
|
|
deviceExtraOpts.bootindex = "2";
|
|
driveExtraOpts.format = if cfg.writableStore then "qcow2" else "raw";
|
|
}])
|
|
(imap0 (idx: _: {
|
|
file = "$(pwd)/empty${toString idx}.qcow2";
|
|
driveExtraOpts.werror = "report";
|
|
}) cfg.emptyDiskImages)
|
|
];
|
|
|
|
# By default, use mkVMOverride to enable building test VMs (e.g. via
|
|
# `nixos-rebuild build-vm`) of a system configuration, where the regular
|
|
# value for the `fileSystems' attribute should be disregarded (since those
|
|
# filesystems don't necessarily exist in the VM). You can disable this
|
|
# override by setting `virtualisation.fileSystems = lib.mkForce { };`.
|
|
fileSystems = lib.mkIf (cfg.fileSystems != { }) (mkVMOverride cfg.fileSystems);
|
|
|
|
virtualisation.fileSystems = let
|
|
mkSharedDir = tag: share:
|
|
{
|
|
name =
|
|
if tag == "nix-store" && cfg.writableStore
|
|
then "/nix/.ro-store"
|
|
else share.target;
|
|
value.device = tag;
|
|
value.fsType = "9p";
|
|
value.neededForBoot = true;
|
|
value.options =
|
|
[ "trans=virtio" "version=9p2000.L" "msize=${toString cfg.msize}" ]
|
|
++ lib.optional (tag == "nix-store") "cache=loose";
|
|
};
|
|
in lib.mkMerge [
|
|
(lib.mapAttrs' mkSharedDir cfg.sharedDirectories)
|
|
{
|
|
"/" = lib.mkIf cfg.useDefaultFilesystems (if cfg.diskImage == null then {
|
|
device = "tmpfs";
|
|
fsType = "tmpfs";
|
|
} else {
|
|
device = cfg.rootDevice;
|
|
fsType = "ext4";
|
|
});
|
|
"/tmp" = lib.mkIf config.boot.tmp.useTmpfs {
|
|
device = "tmpfs";
|
|
fsType = "tmpfs";
|
|
neededForBoot = true;
|
|
# Sync with systemd's tmp.mount;
|
|
options = [ "mode=1777" "strictatime" "nosuid" "nodev" "size=${toString config.boot.tmp.tmpfsSize}" ];
|
|
};
|
|
"/nix/${if cfg.writableStore then ".ro-store" else "store"}" = lib.mkIf cfg.useNixStoreImage {
|
|
device = "/dev/disk/by-label/${nixStoreFilesystemLabel}";
|
|
neededForBoot = true;
|
|
options = [ "ro" ];
|
|
};
|
|
"/nix/.rw-store" = lib.mkIf (cfg.writableStore && cfg.writableStoreUseTmpfs) {
|
|
fsType = "tmpfs";
|
|
options = [ "mode=0755" ];
|
|
neededForBoot = true;
|
|
};
|
|
"/boot" = lib.mkIf (cfg.useBootLoader && cfg.bootPartition != null) {
|
|
device = cfg.bootPartition;
|
|
fsType = "vfat";
|
|
noCheck = true; # fsck fails on a r/o filesystem
|
|
};
|
|
}
|
|
];
|
|
|
|
boot.initrd.systemd = lib.mkIf (config.boot.initrd.systemd.enable && cfg.writableStore) {
|
|
mounts = [{
|
|
where = "/sysroot/nix/store";
|
|
what = "overlay";
|
|
type = "overlay";
|
|
options = "lowerdir=/sysroot/nix/.ro-store,upperdir=/sysroot/nix/.rw-store/store,workdir=/sysroot/nix/.rw-store/work";
|
|
wantedBy = ["initrd-fs.target"];
|
|
before = ["initrd-fs.target"];
|
|
requires = ["rw-store.service"];
|
|
after = ["rw-store.service"];
|
|
unitConfig.RequiresMountsFor = "/sysroot/nix/.ro-store";
|
|
}];
|
|
services.rw-store = {
|
|
unitConfig = {
|
|
DefaultDependencies = false;
|
|
RequiresMountsFor = "/sysroot/nix/.rw-store";
|
|
};
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
ExecStart = "/bin/mkdir -p -m 0755 /sysroot/nix/.rw-store/store /sysroot/nix/.rw-store/work /sysroot/nix/store";
|
|
};
|
|
};
|
|
};
|
|
|
|
swapDevices = (if cfg.useDefaultFilesystems then mkVMOverride else mkDefault) [ ];
|
|
boot.initrd.luks.devices = (if cfg.useDefaultFilesystems then mkVMOverride else mkDefault) {};
|
|
|
|
# Don't run ntpd in the guest. It should get the correct time from KVM.
|
|
services.timesyncd.enable = false;
|
|
|
|
services.qemuGuest.enable = cfg.qemu.guestAgent.enable;
|
|
|
|
system.build.vm = hostPkgs.runCommand "nixos-vm" {
|
|
preferLocalBuild = true;
|
|
meta.mainProgram = "run-${config.system.name}-vm";
|
|
}
|
|
''
|
|
mkdir -p $out/bin
|
|
ln -s ${config.system.build.toplevel} $out/system
|
|
ln -s ${hostPkgs.writeScript "run-nixos-vm" startVM} $out/bin/run-${config.system.name}-vm
|
|
'';
|
|
|
|
# When building a regular system configuration, override whatever
|
|
# video driver the host uses.
|
|
services.xserver.videoDrivers = mkVMOverride [ "modesetting" ];
|
|
services.xserver.defaultDepth = mkVMOverride 0;
|
|
services.xserver.resolutions = mkVMOverride [ cfg.resolution ];
|
|
services.xserver.monitorSection =
|
|
''
|
|
# Set a higher refresh rate so that resolutions > 800x600 work.
|
|
HorizSync 30-140
|
|
VertRefresh 50-160
|
|
'';
|
|
|
|
# Wireless won't work in the VM.
|
|
networking.wireless.enable = mkVMOverride false;
|
|
services.connman.enable = mkVMOverride false;
|
|
|
|
# Speed up booting by not waiting for ARP.
|
|
networking.dhcpcd.extraConfig = "noarp";
|
|
|
|
networking.usePredictableInterfaceNames = false;
|
|
|
|
system.requiredKernelConfig = with config.lib.kernelConfig;
|
|
[ (isEnabled "VIRTIO_BLK")
|
|
(isEnabled "VIRTIO_PCI")
|
|
(isEnabled "VIRTIO_NET")
|
|
(isEnabled "EXT4_FS")
|
|
(isEnabled "NET_9P_VIRTIO")
|
|
(isEnabled "9P_FS")
|
|
(isYes "BLK_DEV")
|
|
(isYes "PCI")
|
|
(isYes "NETDEVICES")
|
|
(isYes "NET_CORE")
|
|
(isYes "INET")
|
|
(isYes "NETWORK_FILESYSTEMS")
|
|
] ++ optionals (!cfg.graphics) [
|
|
(isYes "SERIAL_8250_CONSOLE")
|
|
(isYes "SERIAL_8250")
|
|
] ++ optionals (cfg.writableStore) [
|
|
(isEnabled "OVERLAY_FS")
|
|
];
|
|
|
|
};
|
|
|
|
# uses types of services/x11/xserver.nix
|
|
meta.buildDocsInSandbox = false;
|
|
}
|