Makefile

# Connectivity info for Linux VM
NIXADDR ?= unset
NIXPORT ?= 22
NIXUSER ?= stefan

# Get the path to this Makefile and directory
MAKEFILE_DIR := $(patsubst %/,%,$(dir $(abspath $(lastword $(MAKEFILE_LIST)))))

# The name of the nixosConfiguration in the flake
NIXNAME ?= vm-intel

# SSH options that are used. These aren't meant to be overridden but are
# reused a lot so we just store them up here.
SSH_OPTIONS=-o PubkeyAuthentication=no -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no

switch:
	sudo NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 nixos-rebuild switch --flake ".#${NIXNAME}"

test:
	sudo NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 nixos-rebuild test --flake ".#$(NIXNAME)"

# This builds the given NixOS configuration and pushes the results to the
# cache. This does not alter the current running system. This requires
# cachix authentication to be configured out of band.
cache:
	nix build '.#nixosConfigurations.$(NIXNAME).config.system.build.toplevel' --json \
		| jq -r '.[].outputs | to_entries[].value' \
		| cachix push stefan-nixos

# bootstrap a brand new VM. The VM should have NixOS ISO on the CD drive
# and just set the password of the root user to "root". This will install
# NixOS. After installing NixOS, you must reboot and set the root password
# for the next step.
#
# NOTE(stefan): I'm sure there is a way to do this and bootstrap all
# in one step but when I tried to merge them I got errors. One day.
vm/bootstrap0:
	ssh $(SSH_OPTIONS) -p$(NIXPORT) root@$(NIXADDR) " \
		parted /dev/nvme0n1 -- mklabel gpt; \
		parted /dev/nvme0n1 -- mkpart primary 512MiB -8GiB; \
		parted /dev/nvme0n1 -- mkpart primary linux-swap -8GiB 100\%; \
		parted /dev/nvme0n1 -- mkpart ESP fat32 1MiB 512MiB; \
		parted /dev/nvme0n1 -- set 3 esp on; \
		sleep 1; \
		mkfs.ext4 -L nixos /dev/nvme0n1p1; \
		mkswap -L swap /dev/nvme0n1p2; \
		mkfs.fat -F 32 -n boot /dev/nvme0n1p3; \
		sleep 1; \
		mount /dev/disk/by-label/nixos /mnt; \
		mkdir -p /mnt/boot; \
		mount /dev/disk/by-label/boot /mnt/boot; \
		nixos-generate-config --root /mnt; \
		sed --in-place '/system\.stateVersion = .*/a \
			nix.package = pkgs.nixUnstable;\n \
			nix.extraOptions = \"experimental-features = nix-command flakes\";\n \
			nix.binaryCaches = [\"https://stefan-nixos.cachix.org\"];\n \
			nix.binaryCachePublicKeys = [\"stefan-nixos.cachix.org-1:S1iE7zFwwpUesnnKkihuLgZKWtaG3Buf7Ca/QZtQzzM=\"];\n \
  			services.openssh.enable = true;\n \
			services.openssh.passwordAuthentication = true;\n \
			services.openssh.permitRootLogin = \"yes\";\n \
			users.users.root.initialPassword = \"root\";\n \
		' /mnt/etc/nixos/configuration.nix; \
		nixos-install --no-root-passwd; \
		nix-env -iA nixos.git; \
		reboot; \
	"

# after bootstrap0, run this to finalize. After this, do everything else
# in the VM unless secrets change.
vm/bootstrap:
	$(MAKE) vm/secrets
	NIXUSER=root $(MAKE) vm/copy
	NIXUSER=root $(MAKE) vm/switch

	ssh $(SSH_OPTIONS) -p$(NIXPORT) $(NIXUSER)@$(NIXADDR) " \
		sudo reboot; \
	"

# TODO
# copy our secrets into the VM
vm/secrets:
	# SSH keys
	rsync -av -e 'ssh $(SSH_OPTIONS)' \
		--exclude='environment' \
		$(HOME)/.ssh/ root@$(NIXADDR):~/.ssh

# copy the Nix configurations into the VM.
vm/copy:
	rsync -av -e 'ssh $(SSH_OPTIONS) -p$(NIXPORT)' \
		--exclude='vendor/' \
		--exclude='.git/' \
		--exclude='.git-crypt/' \
		--exclude='iso/' \
		--rsync-path="sudo rsync" \
		$(MAKEFILE_DIR)/ $(NIXUSER)@$(NIXADDR):/nix-config

# run the nixos-rebuild switch command. This does NOT copy files so you
# have to run vm/copy before.
vm/switch:
	ssh $(SSH_OPTIONS) -p$(NIXPORT) $(NIXUSER)@$(NIXADDR) " \
		sudo NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 nixos-rebuild switch --flake \"/nix-config#${NIXNAME}\" \
	"

# Build an ISO image
iso/nixos.iso:
	cd iso; ./build.sh