103 lines
2.9 KiB
Nix
103 lines
2.9 KiB
Nix
{pkgs, config, ...}:
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with pkgs.lib;
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let
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luks = config.boot.initrd.luks;
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openCommand = { name, device, ... }: ''
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# Wait for luksRoot to appear, e.g. if on a usb drive.
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# XXX: copied and adapted from stage-1-init.sh - should be
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# available as a function.
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if ! test -e ${device}; then
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echo -n "waiting 10 seconds for device ${device} to appear..."
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for ((try = 0; try < 10; try++)); do
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sleep 1
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if test -e ${device}; then break; fi
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echo -n .
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done
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echo "ok"
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fi
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# open luksRoot and scan for logical volumes
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cryptsetup luksOpen ${device} ${name}
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'';
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isPreLVM = f: f.preLVM;
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preLVM = filter isPreLVM luks.devices;
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postLVM = filter (f: !(isPreLVM f)) luks.devices;
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in
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{
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options = {
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boot.initrd.luks.enable = mkOption {
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default = false;
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description = '';
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Have luks in the initrd.
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'';
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};
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boot.initrd.luks.devices = mkOption {
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default = [ ];
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example = [ { name = "luksroot"; device = "/dev/sda3"; preLVM = true; } ];
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description = '';
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The list of devices that should be decrypted using LUKS before trying to mount the
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root partition. This works for both LVM-over-LUKS and LUKS-over-LVM setups.
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The devices are decrypted to the device mapper names defined.
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Make sure that initrd has the crypto modules needed for decryption.
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'';
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type = types.list types.optionSet;
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options = {
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name = mkOption {
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example = "luksroot";
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type = types.string;
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description = "Named to be used for the generated device in /dev/mapper.";
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};
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device = mkOption {
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example = "/dev/sda2";
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type = types.string;
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description = "Path of the underlying block device.";
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};
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preLVM = mkOption {
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default = true;
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type = types.bool;
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description = "Whether the luksOpen will be attempted before LVM scan or after it.";
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};
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};
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};
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};
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config = mkIf luks.enable {
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# Some modules that may be needed for mounting anything ciphered
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boot.initrd.kernelModules = [ "aes_generic" "aes_x86_64" "dm_mod" "dm_crypt"
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"sha256_generic" "cbc" "cryptd" ];
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# copy the cryptsetup binary and it's dependencies
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boot.initrd.extraUtilsCommands = ''
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cp -pdv ${pkgs.cryptsetup}/sbin/cryptsetup $out/bin
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# XXX: do we have a function that does this?
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for lib in $(ldd $out/bin/cryptsetup |grep '=>' |grep /nix/store/ |cut -d' ' -f3); do
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cp -pdvn $lib $out/lib
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cp -pvn $(readlink -f $lib) $out/lib
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done
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'';
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boot.initrd.extraUtilsCommandsTest = ''
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$out/bin/cryptsetup --version
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'';
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boot.initrd.preLVMCommands = concatMapStrings openCommand preLVM;
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boot.initrd.postDeviceCommands = concatMapStrings openCommand postLVM;
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environment.systemPackages = [ pkgs.cryptsetup ];
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};
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}
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