#cwd := $(notdir $(patsubst %/,%,$(dir $(abspath $(lastword $(MAKEFILE_LIST))))))
hostName    := courge
disk_ssd1   := /dev/disk/by-id/nvme-INTEL_SSDPEKKF256G8L_BTHP91220R5E256B
zpool       := $(hostName)
cipher      := aes-128-gcm
autotrim    := on
reservation := 1G
compression := zstd
target      := nixos@192.168.3.101
TARGET      := root@192.168.3.101

machine-id.clear:
	touch -a $@
	sudo unshare --mount sh -xc 'mount --bind $@ /etc/machine-id && systemd-machine-id-setup'
credential.secret: machine-id.clear
	sudo unshare --mount sh -xc 'mount --bind machine-id.clear /etc/machine-id && mount --bind . /var/lib/systemd && systemd-creds setup'
credential.secret.gpg: credential.secret
	sudo chown $(USER) credential.secret
	gpg --encrypt $(shell printf -- ' -r %s' $$(cat .gpg-id)) credential.secret
	shred -fu $<

ssh/host.key ssh/host.key.pub:
	mkdir -p $(@D)
	ssh-keygen -t ed25519 -f $@
ssh/host.key.gpg: ssh/host.key
	gpg --encrypt $(shell printf -- ' -r %s' $$(cat .gpg-id)) $<
	shred -fu $<
ssh/host.key.cred: ssh/host.key.gpg
	../gpg2cred-local.sh $< host.key

wipe:
	ssh $(TARGET) sh -xec '" \
	  modprobe zfs; \
	  ! zpool list $(zpool) || zpool export -f $(zpool); \
	  zpool labelclear -f /dev/disk/by-partlabel/$(hostName)_ssd1_zpool || true; \
	  sgdisk --zap-all $(disk_ssd1); \
	  partprobe || true; \
	  udevadm settle; \
	"'

part: wipe
	# https://wiki.archlinux.org/index.php/BIOS_boot_partition
	#sudo $$(which sgdisk) -a1 -n0:34:2047  -t0:EF02 -c0:"$(hostName)_ssd1_bios"  $(disk_ssd1)
	# https://wiki.archlinux.org/index.php/Partitioning#Tricking_old_BIOS_into_booting_from_GPT
	#printf '\200\0\0\0\0\0\0\0\0\0\0\0\001\0\0\0' | sudo dd of=$(disk_ssd1) bs=1 seek=462
	ssh $(TARGET) sh -xec '" \
	  sgdisk -n0::+256M -t0:EF00 -c0:"$(hostName)_ssd1_boot"  $(disk_ssd1); \
	  sgdisk -n0:0:+4G  -t0:8200 -c0:"$(hostName)_ssd1_swap"  $(disk_ssd1); \
	  sgdisk -n0:0:0    -t0:BF01 -c0:"$(hostName)_ssd1_zpool" $(disk_ssd1); \
	  sgdisk --randomize-guids $(disk_ssd1); \
	  sgdisk --backup=$(hostName)_ssd1.sgdisk $(disk_ssd1); \
	  partprobe || true; \
	  udevadm settle; \
	  mkfs.vfat -F 32 -s 1 -n EFI /dev/disk/by-partlabel/$(hostName)_ssd1_boot; \
	  zpool create -o ashift=12 \
	    -O utf8only=on \
	    -R /mnt/$(hostName) $(zpool) /dev/disk/by-partlabel/$(hostName)_ssd1_zpool; \
	  zpool set autotrim=$(autotrim) $(zpool); \
	  zfs set \
	    acltype=off \
	    atime=off \
	    canmount=off \
	    compression=$(compression) \
	    dnodesize=auto \
	    relatime=on \
	    xattr=off \
	    mountpoint=none \
	    $(zpool); \
	  zfs create -o canmount=off -o mountpoint=none $(zpool)/reserved; \
	  zfs set refreservation=$(reservation) $(zpool)/reserved; \
	  zfs create -o canmount=on -o mountpoint=/ \
	    $(if $(cipher),-o encryption=$(cipher) \
	    -o keyformat=passphrase \
	    -o keylocation=prompt) \
	    $(zpool)/root; \
	  for p in nix home var; do \
	    zfs create $(zpool)/root/\$$p; \
	  done; \
	  zfs set acltype=posixacl xattr=sa $(zpool)/root/var; \
	"'
	#https://askubuntu.com/questions/970886/journalctl-says-failed-to-search-journal-acl-operation-not-supported

	  #sudo zfs set sync=disabled $(zpool)/root/var/tmp
	  #sudo zfs set copies=2 $(zpool)/root/home/files

copy-ssh:
	host=$(TARGET); host=$${host#*@}; ssh-keygen -R $$host
	ssh-copy-id $(TARGET)
	#ssh -oForwardAgent=yes nixos@192.168.3.101 ssh-copy-id -i .ssh/id_ed25519.pub julm@192.168.3.1

install: NIX_STORE_DIR=/nix/store
install: targetRoot=/mnt/$(hostName)
install: targetStore=store=$(NIX_STORE_DIR)&remote-store=$(targetRoot)%3fstore=$(NIX_STORE_DIR)%26real=$(targetRoot)$(NIX_STORE_DIR)
install:
	nix -L build --out-link ../$(hostName).root \
	  "../..#nixosConfigurations.$(hostName).config.system.build.toplevel"
	ssh $(TARGET) sh -xec '" \
	  zpool list $(zpool) || zpool import $(zpool); \
	  test \$$(zfs get -H encryption -o value $(zpool)/root) = off || \
	  test \$$(zfs get -H keystatus -o value $(zpool)/root) = available || \
	  zfs load-key $(zpool)/root; \
	  mountpoint $(targetRoot) || \
	  mount -v -o zfsutil,X-mount.mkdir -t zfs $(zpool)/root $(targetRoot); \
	  mountpoint $(targetRoot)/boot1 || \
	  mount -v -o X-mount.mkdir /dev/disk/by-partlabel/$(hostName)_ssd1_boot $(targetRoot)/boot1; \
	  mountpoint $(targetRoot)/nix || \
	  mount -v -o zfsutil,X-mount.mkdir -t zfs $(zpool)/root/nix $(targetRoot)/nix; \
	  mountpoint $(targetRoot)/var || \
	  mount -v -o zfsutil,X-mount.mkdir -t zfs $(zpool)/root/var $(targetRoot)/var; \
	  findmnt \
	"'
	nix copy --to "ssh://$(TARGET)?$(targetStore)" ../courge.root
	gpg -d credential.secret.gpg | \
	ssh $(TARGET) sh -xec '" \
	  nix-env --store $(targetRoot) -p $(targetRoot)/nix/var/nix/profiles/system \
	    --set '$$(readlink -f ../$(hostName).root)'; \
	  mkdir -m 0755 -p $(targetRoot)/etc; \
	  touch $(targetRoot)/etc/NIXOS; \
	  install -D -o root -g root -m 400 /dev/stdin $(targetRoot)/var/lib/systemd/credential.secret; \
	"'
	ssh $(TARGET) nixos-enter --root $(targetRoot) -c '" \
	  set -eux; \
	  mount --rbind --mkdir / $(targetRoot); \
	  mount --make-rslave $(targetRoot); \
	  NIXOS_INSTALL_BOOTLOADER=1 $(shell realpath -e ../courge.root)/bin/switch-to-configuration boot; \
	  umount -R $(targetRoot) && rmdir $(targetRoot) \
	"'