75 lines
2.1 KiB
Nix
75 lines
2.1 KiB
Nix
{pkgs, config, ...}:
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with pkgs.lib;
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let
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luksRoot = config.boot.initrd.luksRoot;
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in
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{
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options = {
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boot.initrd.luksRoot = mkOption {
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default = "";
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example = "/dev/sda3";
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description = '';
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The device 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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Make sure that initrd has the crypto modules needed for decryption.
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The decrypted device name is /dev/mapper/luksroot.
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'';
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};
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};
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config = mkIf (luksRoot != "") {
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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) $out/lib
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done
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'';
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# test whether cryptsetup finds all dependencies and is at least
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# version 1.4.1
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boot.initrd.extraUtilsCommandsTest = ''
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cryptsetup_version=$($out/bin/cryptsetup --version |cut -d' ' -f2)
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if test $(echo $version |cut -d'.' -f1) -lt 1; then
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if test $(echo $version |cut -d'.' -f2) -lt 4; then
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if test $(echo $version |cut -d'.' -f3) -lt 2; then
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echo "Somehow the version of cryptsetup is too old: $cryptsetup_version instead of 1.4.1"
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exit 1
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fi
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fi
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fi
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unset cryptsetup_version
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'';
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boot.initrd.preLVMCommands = ''
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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 ${luksRoot}; then
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echo -n "waiting for device ${luksRoot} 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 ${luksRoot}; 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 ${luksRoot} luksroot
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'';
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};
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}
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