32 lines
1.2 KiB
Nix
32 lines
1.2 KiB
Nix
{ ... }:
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{
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# Don't make the nix store read-only, as this would prevent the overlay FS
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# from being able to mount it.
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boot.readOnlyNixStore = false;
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# Mount the hut nix store via NFS in read-only mode.
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fileSystems."/mnt/hut-nix-store" = {
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device = "hut:/nix/store";
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fsType = "nfs";
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options = [ "ro" ];
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};
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# A workdir is also needed, so setup a permanent dir using tmpfiles.
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systemd.tmpfiles.rules = [
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"d /mnt/nix-work 0700 root root -"
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];
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# Mount an overlay in /nix/store using as lower layer the NFS store and upper
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# layer the disk nix store. The destination is still the nix store in
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# /nix/store (confusing). We need rw access, as the daemon need to write the
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# lock files to build derivations locally.
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# HACK: Use /nix//store to prevent the overlay to be mounted on boot, see:
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# https://github.com/NixOS/nixpkgs/blob/17a46d09ac123d0da3a26855bf3af7db01f9c751/nixos/lib/utils.nix#L14
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fileSystems."/nix//store" = {
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device = "overlay";
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fsType = "overlay";
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options = [ "lowerdir=/mnt/hut-nix-store,upperdir=/nix/store,workdir=/mnt/nix-work" ];
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depends = [ "/nix/store" "/mnt/hut-nix-store" "/mnt/nix-work" ];
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};
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}
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