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65 lines
1.6 KiB
Nix
Executable file
65 lines
1.6 KiB
Nix
Executable file
# Closure size and startup time optimization for disposable use-cases
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{
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config,
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options,
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lib,
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...
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}:
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let
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cfg = config.microvm;
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canSwitchViaSsh =
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config.services.openssh.enable
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&&
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# Is the /nix/store mounted from the host?
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builtins.any ({ source, ... }: source == "/nix/store") config.microvm.shares;
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in
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lib.mkIf (cfg.guest.enable && cfg.optimize.enable) {
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# The docs are pretty chonky
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documentation.enable = lib.mkDefault false;
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boot = {
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initrd.systemd = {
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# Use systemd initrd for startup speed.
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# TODO: error mounting /nix/store on crosvm, kvmtool
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enable = lib.mkDefault (
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builtins.elem cfg.hypervisor [
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"qemu"
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"cloud-hypervisor"
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"firecracker"
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"stratovirt"
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]
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);
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tpm2.enable = lib.mkDefault false;
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};
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kernelParams = [
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# we only need one serial console
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"8250.nr_uarts=1"
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];
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swraid.enable = lib.mkDefault false;
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};
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nixpkgs.overlays = [
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(final: prev: {
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stratovirt = prev.stratovirt.override { gtk3 = null; };
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})
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];
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# networkd is used due to some strange startup time issues with nixos's
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# homegrown dhcp implementation
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networking.useNetworkd = lib.mkDefault true;
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systemd = {
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# Due to a bug in systemd-networkd: https://github.com/systemd/systemd/issues/29388
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# we cannot use systemd-networkd-wait-online.
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network.wait-online.enable = lib.mkDefault false;
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tpm2.enable = lib.mkDefault false;
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};
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# Exclude switch-to-configuration.pl from toplevel.
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system = lib.optionalAttrs (options.system ? switch && !canSwitchViaSsh) {
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switch.enable = lib.mkDefault false;
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};
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}
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