nixos/mini/install.txt

#
# enable ssh for root
#

sudo bash
systemctl start sshd
passwd

#
# install script below
#

# fix unlocking https://nixos.wiki/wiki/Bcachefs
nix-env -iA nixos.keyutils
keyctl link @u @s

#
# kill old efi boot stuff
#

efibootmgr
efibootmgr -b 0 -B
efibootmgr -b 1 -B
efibootmgr -b 2 -B
efibootmgr -b 3 -B
efibootmgr -b 4 -B
efibootmgr

# Defining some helper variables (these will be used in later code
# blocks as well, so make sure to use the same terminal session or
# redefine them later)
DISK=/dev/disk/by-id/nvme-CT4000P3PSSD8_2325E6E63746
DISK2=/dev/disk/by-id/ata-CT2000MX500SSD1_2138E5D5061F
HOST=mini

# ensure 4k sector size
nvme format --lbaf=1 --force $DISK
nvme id-ns -H $DISK

sleep 5

# kill old data
sgdisk --zap-all $DISK
blkdiscard -v $DISK
wipefs -a $DISK
gdisk -l $DISK

# wipe second disk
sgdisk --zap-all $DISK2
blkdiscard -v $DISK2
wipefs -a $DISK2

sleep 5

# create partitions
parted $DISK -- mklabel gpt
sgdisk -n 1:0:+1024M -c 1:"EFI System Partition" -t 1:EF00 $DISK
sgdisk -n 2:0:0 -c 2:"Linux" -t 2:8e00 $DISK
parted $DISK -- set 1 boot on

sleep 5

# take a look
cat /proc/partitions

# boot partition
mkfs.fat -F 32 -n EFIBOOT $DISK-part1

sleep 5

# create encrypted bcachefs over all disks, use only fast lz4 compression
bcachefs format --block_size=4096 --errors=ro --compression=lz4 --wide_macs --acl --encrypted --fs_label=nix --discard -f $DISK-part2 $DISK2

sleep 5

# prepare install, tmpfs root
mount -t tmpfs none /mnt

# Create directories to mount file systems on
mkdir -p /mnt/{nix,home,boot,root,etc/nixos}

# mount the ESP
mount $DISK-part1 /mnt/boot

# mount large bcachefs
mount -t bcachefs $DISK-part2:$DISK2 /mnt/nix

# ensure tmp fills not the RAM
mkdir -p /mnt/tmp /mnt/nix/tmp
mount --bind /mnt/nix/tmp /mnt/tmp

# bind mount persistent stuff to data
mkdir -p /mnt/nix/data/{home,root,nixos/$HOST}
mount --bind /mnt/nix/data/home /mnt/home
mount --bind /mnt/nix/data/root /mnt/root
mount --bind /mnt/nix/data/nixos/$HOST /mnt/etc/nixos

# create fake /nix/data to have the right paths
mkdir -p /nix/data
mount --bind /mnt/nix/data /nix/data

# take a look
mount

# configure
nixos-generate-config --root /mnt

# check /mnt/etc/nixos/hardware-configuration.nix /mnt/etc/nixos/configuration.nix

# copy config data from another machine including secrets

sudo scp -r /nix/data/nixos root@192.168.13.100:/mnt/nix/data

# install

nixos-install --option experimental-features 'nix-command flakes' --no-root-passwd --root /mnt

# unmount all stuff and sync

umount -Rl /nix/data /mnt
sync

# sync all /data after the install

sudo -E rsync -va --delete --one-file-system /nix/data/ root@192.168.13.100:/nix/data/