more bcache stuff

utilities/nixos-installers/install_bcachefs.md

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+# Install nix minimal with bcachefs filesystem
+
+- optional encryption
+- optional auto unlock with USB key
+- custom iso installer
+  - `nix build .\#packages.x86_64-linux.iso-minimal-stable`
+
+## Format main drive with boot partition
+
+### Partition with GPT
+
+```sh
+DEVICE=sda
+parted /dev/$DEVICE -- mklabel gpt
+parted /dev/$DEVICE -- mkpart ESP fat32 1MB 2GB
+parted /dev/$DEVICE -- set 1 esp on
+# TODO make swap partition instead here? Bcachefs not working with swapfile
+parted /dev/$DEVICE -- mkpart PRIMARY 2GB 100%
+```
+
+### Format partitions
+
+- boot
+
+```sh
+BOOT=sda1
+mkfs.fat -F 32 -n BOOT /dev/$BOOT
+```
+
+- primary
+
+```sh
+PRIMARY=sda2
+keyctl link @u @s
+bcachefs format --label=nixos --encrypted /dev/$PRIMARY
+bcachefs unlock /dev/$PRIMARY
+```
+
+### Setup subvolumes
+
+```sh
+# keyctl link @u @s
+# TODO check this is it 7 or 8 for print?
+U=$(lsblk -o fsType,uuid | grep bcachefs | awk '{print $2}')
+echo $U
+mount /dev/disk/by-uuid/$U /mnt
+
+bcachefs subvolume create /mnt/@root
+bcachefs subvolume create /mnt/@nix
+bcachefs set-file-option /mnt/@nix --compression=zstd
+bcachefs subvolume create /mnt/@snapshots
+bcachefs set-file-option /mnt/@snapshots --compression=zstd
+bcachefs subvolume create /mnt/@swap
+bcachefs set-file-option /mnt/@swap --nocow
+bcachefs subvolume create /mnt/@persist
+
+umount /mnt
+```
+
+> Tip `getfattr -d -m '^bcachefs\.' filename`
+
+> Note: Format any additional drives if you need to
+
+### Mount subvolumes
+
+```sh
+DEV_B="/dev/disk/by-uuid/"$(lsblk -o NAME,UUID | grep $BOOT | awk '{print $2}')
+DEV_P="/dev/disk/by-uuid/"$(lsblk -o NAME,UUID | grep $PRIMARY | awk '{print $2}')
+mount -t bcachefs -o X-mount.subdir=@root $DEV_P /mnt
+mount -t vfat $DEV_B /mnt/boot --mkdir
+mount -t bcachefs -o X-mount.mkdir,X-mount.subdir=@nix,relatime $DEV_P /mnt/nix
+mount -t bcachefs -o X-mount.mkdir,X-mount.subdir=@snapshots,relatime $DEV_P /mnt/.snapshots
+mount -t bcachefs -o X-mount.mkdir,X-mount.subdir=@swap,noatime $DEV_P /mnt/.swap
+mount -t bcachefs -o X-mount.mkdir,X-mount.subdir=@persist $DEV_P /mnt/persist
+```
+
+### Generate hardware config
+
+```sh
+nixos-generate-config --root /mnt
+```
+
+- Copy useful bits out into real config in repo
+- Run nixos-install
+
+```sh
+nixos-install --flake "git+https://git.joshuabell.xyz/ringofstorms/dotfiles?dir=hosts/i001#i001"
+# nh os switch "git+https://git.joshuabell.xyz/ringofstorms/dotfiles?dir=hosts/i001#i001"
+```
+
+or from host machine? TODO haven't tried this fully
+
+```sh
+NIX_SSHOPTS="-i /run/agenix/nix2nix" sudo nixos-rebuild switch --flake "git+https://git.joshuabell.xyz/ringofstorms/dotfiles?dir=hosts/i001#i001" --target-host luser@10.12.14.157 --build-host localhost
+
+```