nixpkgs/nixos/modules/system/boot/modprobe.nix

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{ config, lib, pkgs, ... }:
with lib;
{
###### interface
options = {
system.sbin.modprobe = mkOption {
internal = true;
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default = pkgs.stdenv.mkDerivation {
name = "modprobe";
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buildCommand = ''
mkdir -p $out/bin
for i in ${pkgs.kmod}/sbin/*; do
name=$(basename $i)
echo "$text" > $out/bin/$name
echo 'exec '$i' "$@"' >> $out/bin/$name
chmod +x $out/bin/$name
done
ln -s bin $out/sbin
'';
text =
''
#! ${pkgs.stdenv.shell}
export MODULE_DIR=/run/current-system/kernel-modules/lib/modules
# Fall back to the kernel modules used at boot time if the
# modules in the current configuration don't match the
# running kernel.
if [ ! -d "$MODULE_DIR/$(${pkgs.coreutils}/bin/uname -r)" ]; then
MODULE_DIR=/run/booted-system/kernel-modules/lib/modules/
fi
'';
};
description = ''
Wrapper around modprobe that sets the path to the modules
tree.
'';
};
boot.blacklistedKernelModules = mkOption {
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type = types.listOf types.str;
default = [];
example = [ "cirrusfb" "i2c_piix4" ];
description = ''
List of names of kernel modules that should not be loaded
automatically by the hardware probing code.
'';
};
boot.extraModprobeConfig = mkOption {
default = "";
example =
''
options parport_pc io=0x378 irq=7 dma=1
'';
description = ''
Any additional configuration to be appended to the generated
<filename>modprobe.conf</filename>. This is typically used to
specify module options. See
<citerefentry><refentrytitle>modprobe.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> for details.
'';
type = types.lines;
};
};
###### implementation
Add support for lightweight NixOS containers You can now say: systemd.containers.foo.config = { services.openssh.enable = true; services.openssh.ports = [ 2022 ]; users.extraUsers.root.openssh.authorizedKeys.keys = [ "ssh-dss ..." ]; }; which defines a NixOS instance with the given configuration running inside a lightweight container. You can also manage the configuration of the container independently from the host: systemd.containers.foo.path = "/nix/var/nix/profiles/containers/foo"; where "path" is a NixOS system profile. It can be created/updated by doing: $ nix-env --set -p /nix/var/nix/profiles/containers/foo \ -f '<nixos>' -A system -I nixos-config=foo.nix The container configuration (foo.nix) should define boot.isContainer = true; to optimise away the building of a kernel and initrd. This is done automatically when using the "config" route. On the host, a lightweight container appears as the service "container-<name>.service". The container is like a regular NixOS (virtual) machine, except that it doesn't have its own kernel. It has its own root file system (by default /var/lib/containers/<name>), but shares the Nix store of the host (as a read-only bind mount). It also has access to the network devices of the host. Currently, if the configuration of the container changes, running "nixos-rebuild switch" on the host will cause the container to be rebooted. In the future we may want to send some message to the container so that it can activate the new container configuration without rebooting. Containers are not perfectly isolated yet. In particular, the host's /sys/fs/cgroup is mounted (writable!) in the guest.
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config = mkIf (!config.boot.isContainer) {
environment.etc."modprobe.d/ubuntu.conf".source = "${pkgs.kmod-blacklist-ubuntu}/modprobe.conf";
environment.etc."modprobe.d/nixos.conf".text =
''
${flip concatMapStrings config.boot.blacklistedKernelModules (name: ''
blacklist ${name}
'')}
${config.boot.extraModprobeConfig}
'';
environment.etc."modprobe.d/usb-load-ehci-first.conf".text =
''
softdep uhci_hcd pre: ehci_hcd
softdep ohci_hcd pre: ehci_hcd
'';
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environment.systemPackages = [ config.system.sbin.modprobe pkgs.kmod ];
system.activationScripts.modprobe =
''
# Allow the kernel to find our wrapped modprobe (which searches
# in the right location in the Nix store for kernel modules).
# We need this when the kernel (or some module) auto-loads a
# module.
echo ${config.system.sbin.modprobe}/sbin/modprobe > /proc/sys/kernel/modprobe
'';
environment.variables.MODULE_DIR = "/run/current-system/kernel-modules/lib/modules";
};
}