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make the /nix/store writable under netboot images

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This commit is contained in:
michael bishop 2016-11-29 10:31:07 -04:00
parent 28fa4cfe56
commit e710edeecf
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GPG Key ID: C294FC1A485A409A
1 changed files with 22 additions and 6 deletions
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28
nixos/modules/installer/netboot/netboot.nix
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@ -26,11 +26,6 @@ with lib;
# here and it causes a cyclic dependency. # here and it causes a cyclic dependency.
boot.loader.grub.enable = false; boot.loader.grub.enable = false;
boot.initrd.postMountCommands = ''
mkdir -p /mnt-root/nix/store
mount -t squashfs /nix-store.squashfs /mnt-root/nix/store
'';
# !!! Hack - attributes expected by other modules. # !!! Hack - attributes expected by other modules.
system.boot.loader.kernelFile = "bzImage"; system.boot.loader.kernelFile = "bzImage";
environment.systemPackages = [ pkgs.grub2 pkgs.grub2_efi pkgs.syslinux ]; environment.systemPackages = [ pkgs.grub2 pkgs.grub2_efi pkgs.syslinux ];
@ -42,13 +37,34 @@ with lib;
options = [ "mode=0755" ]; options = [ "mode=0755" ];
}; };
# In stage 1, mount a tmpfs on top of /nix/store (the squashfs
# image) to make this a live CD.
fileSystems."/nix/.ro-store" =
{ fsType = "squashfs";
device = "../nix-store.squashfs";
options = [ "loop" ];
neededForBoot = true;
};
fileSystems."/nix/.rw-store" =
{ fsType = "tmpfs";
options = [ "mode=0755" ];
neededForBoot = true;
};
fileSystems."/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" ];
};
boot.initrd.availableKernelModules = [ "squashfs" ]; boot.initrd.availableKernelModules = [ "squashfs" ];
boot.initrd.kernelModules = [ "loop" ]; boot.initrd.kernelModules = [ "loop" ];
# Closures to be copied to the Nix store, namely the init # Closures to be copied to the Nix store, namely the init
# script and the top-level system configuration directory. # script and the top-level system configuration directory.
netboot.storeContents = netboot.storeContents =
[ config.system.build.toplevel ]; [ config.system.build.toplevel ];
# Create the squashfs image that contains the Nix store. # Create the squashfs image that contains the Nix store.