diff options
Diffstat (limited to 'nixos/modules/virtualisation/qemu-vm.nix')
| -rw-r--r-- | nixos/modules/virtualisation/qemu-vm.nix | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/nixos/modules/virtualisation/qemu-vm.nix b/nixos/modules/virtualisation/qemu-vm.nix index 6423432c78b6..041c7dbec702 100644 --- a/nixos/modules/virtualisation/qemu-vm.nix +++ b/nixos/modules/virtualisation/qemu-vm.nix @@ -278,7 +278,7 @@ in description = '' If enabled, the Nix store in the VM is made writable by - layering a unionfs-fuse/tmpfs filesystem on top of the host's Nix + layering an overlay filesystem on top of the host's Nix store. ''; }; @@ -395,6 +395,13 @@ in chmod 1777 $targetRoot/tmp mkdir -p $targetRoot/boot + + ${optionalString cfg.writableStore '' + echo "mounting overlay filesystem on /nix/store..." + mkdir -p 0755 $targetRoot/nix/.rw-store/store $targetRoot/nix/.rw-store/work $targetRoot/nix/store + mount -t overlay overlay $targetRoot/nix/store \ + -o lowerdir=$targetRoot/nix/.ro-store,upperdir=$targetRoot/nix/.rw-store/store,workdir=$targetRoot/nix/.rw-store/work || fail + ''} ''; # After booting, register the closure of the paths in @@ -412,7 +419,8 @@ in ''; boot.initrd.availableKernelModules = - optional (cfg.qemu.diskInterface == "scsi") "sym53c8xx"; + optional cfg.writableStore "overlay" + ++ optional (cfg.qemu.diskInterface == "scsi") "sym53c8xx"; virtualisation.bootDevice = mkDefault (if cfg.qemu.diskInterface == "scsi" then "/dev/sda" else "/dev/vda"); @@ -447,12 +455,6 @@ in options = [ "trans=virtio" "version=9p2000.L" ]; neededForBoot = true; }; - } // optionalAttrs cfg.writableStore - { "/nix/store" = - { fsType = "unionfs-fuse"; - device = "unionfs"; - options = [ "allow_other" "cow" "nonempty" "chroot=/mnt-root" "max_files=32768" "hide_meta_files" "dirs=/nix/.rw-store=rw:/nix/.ro-store=ro" ]; - }; } // optionalAttrs (cfg.writableStore && cfg.writableStoreUseTmpfs) { "/nix/.rw-store" = { fsType = "tmpfs"; |