diff options
author | Ryan Lahfa <masterancpp@gmail.com> | 2023-04-24 19:39:54 +0200 |
---|---|---|
committer | GitHub <noreply@github.com> | 2023-04-24 19:39:54 +0200 |
commit | 7812abd3d0c3220df13b19b8f7d7887c895b4beb (patch) | |
tree | 3b084173d686dc118c3c10c39778436d5853307b /nixos | |
parent | 0afeb09b6363451de86be9ad37eca1cbf47ac756 (diff) | |
parent | 0df5257b8217dcbd43b195cc25e9fbc309017487 (diff) |
Merge pull request #227881 from NixOS/qemu-vm/mount-host-nix-store
nixos/qemu-vm: introduce `virtualisation.mountHostNixStore` option
Diffstat (limited to 'nixos')
-rw-r--r-- | nixos/modules/virtualisation/qemu-vm.nix | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/nixos/modules/virtualisation/qemu-vm.nix b/nixos/modules/virtualisation/qemu-vm.nix index cbc58344791d0..5b515a29ae628 100644 --- a/nixos/modules/virtualisation/qemu-vm.nix +++ b/nixos/modules/virtualisation/qemu-vm.nix @@ -574,12 +574,15 @@ in virtualisation.writableStore = mkOption { type = types.bool; - default = true; # FIXME + default = cfg.mountHostNixStore; + defaultText = literalExpression "cfg.mountHostNixStore"; description = lib.mdDoc '' If enabled, the Nix store in the VM is made writable by layering an overlay filesystem on top of the host's Nix store. + + By default, this is enabled if you mount a host Nix store. ''; }; @@ -713,6 +716,21 @@ in For applications which do a lot of reads from the store, this can drastically improve performance, but at the cost of disk space and image build time. + + As an alternative, you can use a bootloader which will provide you + with a full NixOS system image containing a Nix store and + avoid mounting the host nix store through + {option}`virtualisation.mountHostNixStore`. + ''; + }; + + virtualisation.mountHostNixStore = + mkOption { + type = types.bool; + default = !cfg.useNixStoreImage && !cfg.useBootLoader; + defaultText = literalExpression "!cfg.useNixStoreImage && !cfg.useBootLoader"; + description = lib.mdDoc '' + Mount the host Nix store as a 9p mount. ''; }; @@ -933,7 +951,7 @@ in virtualisation.additionalPaths = [ config.system.build.toplevel ]; virtualisation.sharedDirectories = { - nix-store = mkIf (!cfg.useNixStoreImage) { + nix-store = mkIf cfg.mountHostNixStore { source = builtins.storeDir; target = "/nix/store"; }; |