fix 1 to 4

README.org

@@ -1,4 +1,4 @@
-* Minimal NixOS Root on ZFS configuration
+* Minimal installer for NixOS using ZFS encrypted root
 This repo contains a minimal set of configuration needed for
 installing NixOS on a computer with ZFS as root filesystem.
 
@@ -8,17 +8,18 @@ LICENSE
 configuration.nix   <- configuration shared by all hosts
 flake.lock
 flake.nix
-hosts/exampleHost/default.nix  <- per-host configuration
-hosts/exampleHost/sshUnlock.txt
+hosts/nixos/default.nix  <- per-host configuration
+hosts/nixos/sshUnlock.txt
 modules/boot/default.nix
 modules/default.nix
 modules/fileSystems/default.nix
 modules/networking/default.nix
 modules/users/default.nix
-#+end_src
+#+end_src text
 
-Just enough to get you started.
-
-See [[https://github.com/ne9z/personal-dotfiles][my personal dotfiles repo]] for an example of how to configure
+* Thanks to
+See [[https://github.com/ne9z/personal-dotfiles][ne9z dotfiles repo]] for an example of how to configure
 servers and desktop computers in the same git repository, based on
 this template repo you are viewing now.
+
+[[https://openzfs.github.io/openzfs-docs/Getting%20Started/NixOS/Root%20on%20ZFS.html][Official Tutorial]]

flake.nix

@@ -18,10 +18,10 @@
         };
     in {
       nixosConfigurations = {
-        exampleHost = let
+        nixos = let
           system = "x86_64-linux";
           pkgs = nixpkgs.legacyPackages.${system};
-        in mkHost (import ./hosts/exampleHost { inherit system pkgs; });
+        in mkHost (import ./hosts/nixos { inherit system pkgs; });
       };
     };
 }

hosts/nixos/default.nix

@@ -1,6 +1,6 @@
 # #
 ##
-##  per-host configuration for exampleHost
+##  per-host configuration for nixos host
 ##
 ##
 
@@ -22,8 +22,8 @@
     };
     networking = {
       # read changeHostName.txt file.
-      hostName = "exampleHost";
-      timeZone = "Europe/Berlin";
+      hostName = "nixos";
+      timeZone = "Europe/Paris";
       hostId = "abcd1234";
     };
   };

install.sh

@@ -0,0 +1,251 @@
+#!/bin/env bash
+
+lsblk
+echo ""
+
+read -p "disk: " DISK
+read -p "swapsize GiB: " SWAPSIZEGIB
+read -p "reserve GiB: " RESERVEGIB
+read -sp "password: " POOLPASS
+
+EMAIL="marc@marcpartensky.com"
+NAME="Marc Partensky"
+
+RESERVE=$((RESERVEGIB * 1024))
+SWAPSIZE=$((SWAPSIZEGIB * 1024))
+
+
+MNT=$(mktemp -d)
+
+log() { echo -e "\n\033[1m${@}\033[0m"; }
+
+log Destroying zfs pool rpool and bpool just in case
+swapoff -a
+zpool import -fa
+for i in ${DISK}; do
+   zpool labelclear -f $i
+done
+zpool destroy -f bpool
+zpool destroy -f rpool
+zpool export -a
+
+log Unmounting filesystems just in case
+# ---
+umount -Rl "${MNT}"
+
+log Enabling Nix Flakes functionality
+# ---
+mkdir -p ~/.config/nix
+echo "experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf
+
+
+log Installing programs needed for system installation
+# ---
+if ! command -v git; then nix-env -f '<nixpkgs>' -iA git; fi
+if ! command -v jq;  then nix-env -f '<nixpkgs>' -iA jq; fi
+if ! command -v partprobe;  then nix-env -f '<nixpkgs>' -iA parted; fi
+
+
+log Partition the disks
+# ---
+partition_disk () {
+ local disk="${1}"
+ blkdiscard -f "${disk}" || true
+
+ parted --script --align=optimal  "${disk}" -- \
+     mklabel gpt \
+     mkpart swap  1MiB $((SWAPSIZE + 1))MiB \
+     mkpart rpool $((SWAPSIZE + 1))MiB -$((RESERVE + 100))MiB \
+     mkpart bpool -$((RESERVE + 100))MiB -$((RESERVE + 3))MiB \
+     mkpart EFI -$((RESERVE + 3))MiB -$((RESERVE + 2))MiB \
+     mkpart BIOS -$((RESERVE + 2))MiB -$((RESERVE + 1))MiB \
+     set 4 esp on \
+     set 5 bios_grub on \
+     set 5 legacy_boot on
+
+ partprobe "${disk}"
+ udevadm settle
+}
+
+for i in ${DISK}; do
+   partition_disk "${i}"
+done
+
+
+log Creating boot pool
+# ---
+# shellcheck disable=SC2046
+zpool create \
+    -o compatibility=grub2 \
+    -o ashift=12 \
+    -o autotrim=on \
+    -O acltype=posixacl \
+    -O canmount=off \
+    -O compression=lz4 \
+    -O devices=off \
+    -O normalization=formD \
+    -O relatime=on \
+    -O xattr=sa \
+    -O mountpoint=/boot \
+    -R "${MNT}" \
+    bpool \
+    $(for i in ${DISK}; do
+       printf '%s ' "${i}3";
+      done)
+
+
+log Creating root pool
+# ---
+# shellcheck disable=SC2046
+echo $POOLPASS | zpool create \
+    -o ashift=12 \
+    -o autotrim=on \
+    -R "${MNT}" \
+    -O acltype=posixacl \
+    -O canmount=off \
+    -O compression=zstd \
+    -O dnodesize=auto \
+    -O normalization=formD \
+    -O relatime=on \
+    -O xattr=sa \
+    -O mountpoint=/ \
+    -o feature@encryption=enabled \
+    -O encryption=on \
+    -O keyformat=passphrase \
+    rpool \
+   $(for i in ${DISK}; do
+      printf '%s ' "${i}2";
+     done)
+
+
+log Creating encrypted root system container
+# ---
+echo $POOLPASS | zfs create \
+    -o canmount=off \
+    -o mountpoint=none \
+    -o encryption=on \
+    -o keylocation=prompt \
+    -o keyformat=passphrase \
+    rpool/nixos
+
+
+log Creating system datasets, managing mountpoints with mountpoint=legacy
+# ---
+zfs create -o mountpoint=legacy     rpool/nixos/root
+mount -t zfs rpool/nixos/root "${MNT}"/
+zfs create -o mountpoint=legacy rpool/nixos/home
+mkdir "${MNT}"/home
+mount -t zfs rpool/nixos/home "${MNT}"/home
+zfs create -o mountpoint=legacy  rpool/nixos/var
+zfs create -o mountpoint=legacy rpool/nixos/var/lib
+zfs create -o mountpoint=legacy rpool/nixos/var/log
+zfs create -o mountpoint=none bpool/nixos
+zfs create -o mountpoint=legacy bpool/nixos/root
+mkdir "${MNT}"/boot
+mount -t zfs bpool/nixos/root "${MNT}"/boot
+mkdir -p "${MNT}"/var/log
+mkdir -p "${MNT}"/var/lib
+mount -t zfs rpool/nixos/var/lib "${MNT}"/var/lib
+mount -t zfs rpool/nixos/var/log "${MNT}"/var/log
+zfs create -o mountpoint=legacy rpool/nixos/empty
+zfs snapshot rpool/nixos/empty@start
+
+
+log Formatting and mounting ESP
+# ---
+for i in ${DISK}; do
+ mkfs.vfat -n EFI "${i}"4
+ mkdir -p "${MNT}"/boot/efis/"${i##*/}"4
+ mount -t vfat -o iocharset=iso8859-1 "${i}"4 "${MNT}"/boot/efis/"${i##*/}"4
+done
+
+
+log Cloning template flake configuration
+# ---
+mkdir -p "${MNT}"/etc
+git clone --depth 1 --branch custom \
+  https://github.com/marcpartensky/dotfiles-flake.git "${MNT}"/etc/nixos
+
+rm -rf "${MNT}"/etc/nixos/.git
+git -C "${MNT}"/etc/nixos/ init -b master
+git -C "${MNT}"/etc/nixos/ add "${MNT}"/etc/nixos/
+git -C "${MNT}"/etc/nixos config user.email $EMAIL
+git -C "${MNT}"/etc/nixos config user.name $NAME
+git -C "${MNT}"/etc/nixos commit -asm 'initial commit'
+
+
+log Customizing configuration to your hardware
+# ---
+for i in ${DISK}; do
+  sed -i \
+  "s|/dev/disk/by-id/|${i%/*}/|" \
+  "${MNT}"/etc/nixos/hosts/nixos/default.nix
+  break
+done
+
+diskNames=""
+for i in ${DISK}; do
+  diskNames="${diskNames} \"${i##*/}\""
+done
+
+sed -i "s|\"bootDevices_placeholder\"|${diskNames}|g" \
+  "${MNT}"/etc/nixos/hosts/nixos/default.nix
+
+sed -i "s|\"abcd1234\"|\"$(head -c4 /dev/urandom | od -A none -t x4| sed 's| ||g' || true)\"|g" \
+  "${MNT}"/etc/nixos/hosts/nixos/default.nix
+
+sed -i "s|\"x86_64-linux\"|\"$(uname -m || true)-linux\"|g" \
+  "${MNT}"/etc/nixos/flake.nix
+
+cp "$(command -v nixos-generate-config || true)" ./nixos-generate-config
+
+chmod a+rw ./nixos-generate-config
+
+# shellcheck disable=SC2016
+echo 'print STDOUT $initrdAvailableKernelModules' >> ./nixos-generate-config
+
+kernelModules="$(./nixos-generate-config --show-hardware-config --no-filesystems | tail -n1 || true)"
+
+sed -i "s|\"kernelModules_placeholder\"|${kernelModules}|g" \
+  "${MNT}"/etc/nixos/hosts/nixos/default.nix
+
+log Setting root password
+# ---
+rootPwd=$(mkpasswd -m SHA-512)
+sed -i \
+"s|rootHash_placeholder|${rootPwd}|" \
+"${MNT}"/etc/nixos/configuration.nix
+
+
+log Commiting changes to local repo
+# ---
+git -C "${MNT}"/etc/nixos commit -asm 'initial installation'
+
+log Updating flake lock file to track latest system version
+# ---
+nix flake update --commit-lock-file \
+  "git+file://${MNT}/etc/nixos"
+
+log Installing system and apply configuration
+# ---
+nixos-install \
+--root "${MNT}" \
+--no-root-passwd \
+--flake "git+file://${MNT}/etc/nixos#nixos"
+
+
+log Setuping encrypted swap. This is useful if the available memory is small
+# ---
+for i in ${DISK}; do
+   cryptsetup open --type plain --key-file /dev/random "${i}"1 "${i##*/}"1
+   mkswap /dev/mapper/"${i##*/}"1
+   swapon /dev/mapper/"${i##*/}"1
+done
+
+log Unmounting filesystems
+# ---
+umount -Rl "${MNT}"
+zpool export -a
+
+
+log The installation is done, enjoy

modules/boot/default.nix

@@ -44,11 +44,11 @@ in {
     };
     partitionScheme = mkOption {
       default = {
-        biosBoot = "-part5";
-        efiBoot = "-part1";
-        swap = "-part4";
-        bootPool = "-part2";
-        rootPool = "-part3";
+        swap = "1";
+        rootPool = "2";
+        bootPool = "3";
+        efiBoot = "4";
+        biosBoot = "5";
       };
       description = "Describe on disk partitions";
       type = types.attrsOf types.str;

modules/networking/default.nix

@@ -7,7 +7,7 @@ in {
     hostName = mkOption {
       description = "The name of the machine.  Used by nix flake.";
       type = types.str;
-      default = "exampleHost";
+      default = "nixos";
     };
     timeZone = mkOption {
       type = types.str;