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nix/os: more work on partition handling

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steveej 2018-11-04 23:56:36 +01:00
parent e7f6744be5
commit f94d349398
3 changed files with 37 additions and 7 deletions
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26
Justfile
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@ -76,15 +76,35 @@ hm-iterate-qtile:
# Sorry, this is a manual step for now. Please see nix/os/modules/encryptedDisk.nix for the layout
disk-prepare:
echo NOT IMPLEMENTED
# GPT partition table
# part1: size: 1MiB type: 4 BIOS BOOT
# part2: size: 512MiB label: 2-DISKID (36 char limit?)
# part3: size: * label: 3-DISKID (36 char limit?)
# cryptsetup format part3
# vgcreate DISKID part3
# lvcreate DISKID -L 8G -n swap
# lvcreate DISKID -l 100%FREE -n root
# sudo mkfs.vfat -F32 part2
# sudo mkfs.btrfs /dev/DISKID/root
# sudo mkswap /dev/DISKID/swap
# sudo mount /dev/DISKID/root /mnt
# sudo btrfs subvolume create nixos
# sudo btrfs subvolume create home
# sudo mount /dev/disk/by-partlabel/3-DISKID /mnt/DISKID-root
# pushd /dev/disk/by-partlabel/3-DISKID /mnt/DISKID-root
# sudo btrfs subvolume create nixos
# sudo mkdir nixos/{boot,home}
# sudo btrfs subvolume create home
#
# Mount the target disk specified by device configuration directory. The 'dir' argument points to a device configuration, e.g. 'nix/os/devices/steveej-live-mmc-SL32G_0x259093f6'
disk-mount dir:
just -v _device diskMount {{dir}}
just -v _device diskMount {{dir}} --argstr rebuildarg "dummy"
# Unmount target disk, specified by device configuration directory
disk-umount dir:
just -v _device diskUmount {{dir}}
just -v _device diskUmount {{dir}} --argstr rebuildarg "dummy"
# Perform an offline installation on the mounted the target disk, specified by device configuration directory
disk-install dir:
just -v _device diskInstall {{dir}}
just -v _device diskInstall {{dir}} --argstr rebuildarg "dummy"

4
nix/os/devices/default.nix
View file

@ -31,12 +31,12 @@ in {
ID=${diskId}
echo Mounting $ID
set -xe
cryptsetup luksOpen /dev/disk/by-partlabel/$ID-part3 $ID-part3
cryptsetup luksOpen /dev/disk/by-id/$ID-part3 $ID-part3
vgchange -ay $ID
mkdir -p /mnt/$ID-root
mount /dev/$ID/root /mnt/$ID-root -o subvol=nixos
mount /dev/$ID/root /mnt/$ID-root/home -o subvol=home
mount /dev/disk/by-partlabel/$ID-part2 /mnt/$ID-root/boot
mount /dev/disk/by-id/$ID-part2 /mnt/$ID-root/boot
'';
diskUmount = pkgs.writeScript "script" ''

14
nix/os/modules/encryptedDisk.nix
View file

@ -6,13 +6,23 @@ with lib;
let
cfg = config.hardware.encryptedDisk;
volumeGroup = cfg.diskId;
# This is important at install-time
bootGrubDevice = lib.concatStrings [ "/dev/disk/by-id/" cfg.diskId ];
bootFsDevice = lib.concatStrings [ "/dev/disk/by-partlabel/" cfg.diskId "-part2" ];
bootLuksDevice = lib.concatStrings [ "/dev/disk/by-partlabel/" cfg.diskId "-part3" ];
# These are guaranteed by LVM
rootFsDevice = lib.concatStrings [ "/dev/" volumeGroup "/root" ];
swapFsDevice = lib.concatStrings [ "/dev/" volumeGroup "/swap" ];
# TODO: verify the GPT PARTLABEL cap at 36 chars
shortenPartlabel = name: (builtins.substring 0 36 name);
# Cannot use the disk ID here because might be different at install vs. runtime.
# Example: MMC card which is used in the internal reader vs. USB reader
bootFsDevice = lib.concatStrings [ "/dev/disk/by-partlabel/" (shortenPartlabel ("2-"+cfg.diskId))];
bootLuksDevice = lib.concatStrings [ "/dev/disk/by-partlabel/" (shortenPartlabel ("3-"+cfg.diskId))];
in {
options.hardware.encryptedDisk = {
enable = mkEnableOption "Enable encrypted filesystem layout";