e65504b5f3
This is useful for virtual machines since we can have a persistent /nix/store on the host machine.
78 lines
2.1 KiB
Nix
78 lines
2.1 KiB
Nix
{
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config,
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lib,
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pkgs,
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...
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}:
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{
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imports = [ ];
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options.me = {
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_9pfs_nix_store.enable = lib.mkOption {
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type = lib.types.bool;
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default = false;
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example = true;
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description = "Whether we want to mount /nix/store over 9pfs (useful in virtual machines to share a directory from the host as a persistent nix store.";
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};
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_9pfs_nix_store.is_iso = lib.mkOption {
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type = lib.types.bool;
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default = false;
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example = true;
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description = "Whether this build is for an ISO. It changes how we mount the nix store.";
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};
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};
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config = lib.mkIf config.me._9pfs_nix_store.enable (
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lib.mkMerge [
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(lib.mkIf config.me._9pfs_nix_store.is_iso {
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# fileSystems = {
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# "/nix/store" = lib.mkForce {
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# fsType = "overlay";
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# device = "overlay";
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# options = [
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# "lowerdir=/nix/.ro-store"
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# "upperdir=/store"
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# "workdir=/work"
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# ];
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# depends = [
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# "/nix/.ro-store"
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# "/store"
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# "/work"
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# ];
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# };
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# "/store" = lib.mkForce {
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# fsType = "9p";
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# device = "nixstore";
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# options = [
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# "trans=virtio"
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# "version=9p2000.L"
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# "x-systemd.requires=modprobe@9pnet_virtio.service"
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# "msize=16384" # Maximum packet size. Increasing this should improve performance at the cost of increased memory usage.
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# "cache=loose"
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# ];
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# };
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# };
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})
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(lib.mkIf (!config.me._9pfs_nix_store.is_iso) {
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fileSystems = {
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"/nix/store" = lib.mkForce {
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fsType = "9p";
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device = "nixstore";
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neededForBoot = true;
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options = [
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"trans=virtio"
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"version=9p2000.L"
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"x-systemd.requires=modprobe@9pnet_virtio.service"
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"msize=16384" # Maximum packet size. Increasing this should improve performance at the cost of increased memory usage.
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"cache=loose"
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];
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};
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};
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})
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]
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);
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}
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