nixpkgs/nixos/tests/os-prober.nix
polykernel 4a9d9928dc nixos/nix-daemon: use structural settings
The `nix.*` options, apart from options for setting up the
daemon itself, currently provide a lot of setting mappings
for the Nix daemon configuration. The scope of the mapping yields
convience, but the line where an option is considered essential
is blurry. For instance, the `extra-sandbox-paths` mapping is
provided without its primary consumer, and the corresponding
`sandbox-paths` option is also not mapped.

The current system increases the maintenance burden as maintainers have to
closely follow upstream changes. In this case, there are two state versions
of Nix which have to be maintained collectively, with different options
avaliable.

This commit aims to following the standard outlined in RFC 42[1] to
implement a structural setting pattern. The Nix configuration is encoded
at its core as key-value pairs which maps nicely to attribute sets, making
it feasible to express in the Nix language itself. Some existing options are
kept such as `buildMachines` and `registry` which present a simplified interface
to managing the respective settings. The interface is exposed as `nix.settings`.

Legacy configurations are mapped to their corresponding options under `nix.settings`
for backwards compatibility.

Various options settings in other nixos modules and relevant tests have been
updated to use structural setting for consistency.

The generation and validation of the configration file has been modified to
use `writeTextFile` instead of `runCommand` for clarity. Note that validation
is now mandatory as strict checking of options has been pushed down to the
derivation level due to freeformType consuming unmatched options. Furthermore,
validation can not occur when cross-compiling due to current limitations.

A new option `publicHostKey` was added to the `buildMachines`
submodule corresponding to the base64 encoded public host key settings
exposed in the builder syntax. The build machine generation was subsequently
rewritten to use `concatStringsSep` for better performance by grouping
concatenations.

[1] - https://github.com/NixOS/rfcs/blob/master/rfcs/0042-config-option.md
2022-01-26 21:04:50 -05:00

122 lines
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Nix

import ./make-test-python.nix ({pkgs, lib, ...}:
let
# A filesystem image with a (presumably) bootable debian
debianImage = pkgs.vmTools.diskImageFuns.debian9i386 {
# os-prober cannot detect systems installed on disks without a partition table
# so we create the disk ourselves
createRootFS = with pkgs; ''
${parted}/bin/parted --script /dev/vda mklabel msdos
${parted}/sbin/parted --script /dev/vda -- mkpart primary ext2 1M -1s
mkdir /mnt
${e2fsprogs}/bin/mkfs.ext4 /dev/vda1
${util-linux}/bin/mount -t ext4 /dev/vda1 /mnt
if test -e /mnt/.debug; then
exec ${bash}/bin/sh
fi
touch /mnt/.debug
mkdir /mnt/proc /mnt/dev /mnt/sys
'';
extraPackages = [
# /etc/os-release
"base-files"
# make the disk bootable-looking
"grub2" "linux-image-686"
];
# install grub
postInstall = ''
ln -sf /proc/self/mounts > /etc/mtab
PATH=/usr/bin:/bin:/usr/sbin:/sbin $chroot /mnt \
grub-install /dev/vda --force
PATH=/usr/bin:/bin:/usr/sbin:/sbin $chroot /mnt \
update-grub
'';
};
# a part of the configuration of the test vm
simpleConfig = {
boot.loader.grub = {
enable = true;
useOSProber = true;
device = "/dev/vda";
# vda is a filesystem without partition table
forceInstall = true;
};
nix.settings = {
substituters = lib.mkForce [];
hashed-mirrors = null;
connect-timeout = 1;
};
# save some memory
documentation.enable = false;
};
# /etc/nixos/configuration.nix for the vm
configFile = pkgs.writeText "configuration.nix" ''
{config, pkgs, lib, ...}: ({
imports =
[ ./hardware-configuration.nix
<nixpkgs/nixos/modules/testing/test-instrumentation.nix>
];
} // lib.importJSON ${
pkgs.writeText "simpleConfig.json" (builtins.toJSON simpleConfig)
})
'';
in {
name = "os-prober";
machine = { config, pkgs, ... }: (simpleConfig // {
imports = [ ../modules/profiles/installation-device.nix
../modules/profiles/base.nix ];
virtualisation.memorySize = 1300;
# To add the secondary disk:
virtualisation.qemu.options = [ "-drive index=2,file=${debianImage}/disk-image.qcow2,read-only,if=virtio" ];
# The test cannot access the network, so any packages
# nixos-rebuild needs must be included in the VM.
system.extraDependencies = with pkgs;
[ sudo
libxml2.bin
libxslt.bin
desktop-file-utils
docbook5
docbook_xsl_ns
unionfs-fuse
ntp
nixos-artwork.wallpapers.simple-dark-gray-bottom
perlPackages.XMLLibXML
perlPackages.ListCompare
shared-mime-info
texinfo
xorg.lndir
grub2
# add curl so that rather than seeing the test attempt to download
# curl's tarball, we see what it's trying to download
curl
];
});
testScript = ''
machine.start()
machine.succeed("udevadm settle")
machine.wait_for_unit("multi-user.target")
print(machine.succeed("lsblk"))
# check that os-prober works standalone
machine.succeed(
"${pkgs.os-prober}/bin/os-prober | grep /dev/vdb1"
)
# rebuild and test that debian is available in the grub menu
machine.succeed("nixos-generate-config")
machine.copy_from_host(
"${configFile}",
"/etc/nixos/configuration.nix",
)
machine.succeed("nixos-rebuild boot --show-trace >&2")
machine.succeed("egrep 'menuentry.*debian' /boot/grub/grub.cfg")
'';
})