Added build script

.gitignore

@@ -1,2 +1,7 @@
 hardware-configuration.nix
+
+# VM files
+result
+*.qcow2
+
 *.swp

build.sh

@@ -0,0 +1,114 @@
+set -euo pipefail
+
+usage() {
+	echo "Usage: $(basename "$0") [-n <flake name>] [-fqwx] <nixos-rebuild args...>
+	This script is a wrapper around nixos-rebuild, designed to simplify applying configurations and testing in vm. Requires super-user privileges.
+
+	examples:
+		$(basename "$0") -n nixos switch
+		- switch configuration to flake named nixos
+
+		$(basename "$0") -f switch
+		- switch configuration and don't ask confirmation
+
+		$(basename "$0") -fwx
+		- build a fresh vm image and run it
+
+	-f
+		Don't ask for confirmation about deleting the /etc/nixos directory.
+	-n name
+		Flake name. Defaults to your hostname.
+	-q
+		Don't output messages from this script.
+	-w
+		Wipes the vm disk file before running qemu, has no effect if not using the -x option.
+		Building the vm after making changes to configs lead to errors without this.
+	-x
+		Run the vm automatically after build. This implies 'build-vm' argument.
+		Also forwards host port 2222 to quest port 22." 1>&2
+	exit 1
+}
+
+log() {
+	if [ "$quiet" != true ]; then
+		echo "[$(basename "$0")] $@"
+	fi
+}
+
+die() {
+	echo "$@"
+	exit 1
+}
+
+[ "$#" -eq 0 ] && usage
+
+original_dir="$(realpath ./)"
+source_dir="$(realpath "$(dirname "$0")")"
+
+name="$(hostname)"
+wipe_vm=""
+execute_vm=""
+force=""
+quiet=""
+
+while getopts ":n::fqwx" o; do
+	case "${o}" in
+		n)
+			name="$OPTARG"
+			;;
+		f)
+			force=true
+			;;
+		q)
+			quiet=true
+			;;
+		w)
+			wipe_vm=true
+			;;
+		x)
+			execute_vm=true
+			;;
+		*)
+			usage
+			;;
+	esac
+done
+shift $((OPTIND-1))
+
+if [ ! -d "$source_dir" ]; then
+	die "$source_dir is not a directory"
+fi
+
+dest_dir="/etc/nixos"
+if [ "$(realpath "$dest_dir")" != "$(realpath "$source_dir")" ]; then
+	if [ "$force" != true ]; then
+		confirm="n"
+		read -p "This will remove your /etc/nixos directory! Do you want to proceed? (y/n) " confirm
+		case "$confirm" in
+			y) ;;
+			*) die "aborting...";;
+		esac
+	fi
+	log "Clearing /etc/nixos"
+	rm -rf "$dest_dir"
+	log "Copying $source_dir to $dest_dir"
+	cp -r "$source_dir" "$dest_dir"
+	cd "$dest_dir" || exit 1
+else
+	log "WARNING: It's recommended to clone this repo somewhere else than $dest_dir"
+fi
+
+sed -Ei 's;^(hardware-configuration.nix)$;#\1;' .gitignore
+[ ! -f 'hardware-configuration.nix' ] && log "Adding hardware-configuration.nix" && nixos-generate-config --show-hardware-config > hardware-configuration.nix
+git add hardware-configuration.nix
+
+cd "$original_dir" || exit 1
+if [ "$execute_vm" = true ]; then
+	# Run the vm and forward ports
+	[ "$wipe_vm" = true ] && rm -f *.qcow2
+	log "Running: nixos-rebuild --flake \"$dest_dir/#${name}\" $@ build-vm && QEMU_NET_OPTS=\"hostfwd=tcp::2222-:22\" ./result/bin/run-${name}-vm"
+	nixos-rebuild --flake "$dest_dir/#${name}" "$@" build-vm && QEMU_NET_OPTS="hostfwd=tcp::2222-:22" ./result/bin/run-${name}-vm
+else
+	log "Running: nixos-rebuild --flake \"$dest_dir/#${name}\" $@"
+	nixos-rebuild --flake "$dest_dir/#${name}" "$@"
+fi