Alright fine we'll use chroot

gentoostrap.sh

@@ -79,7 +79,6 @@ Usage: $_name [OPTION]...
 
   -h			Print this help text
   -c			Perform the Gentoo half of installation. Must be invoked from a chroot
-			or a systemd-nspawn container
   -d			Perform the second Gentoo half of installation from a chroot
   -v			Print more status messages. Stacks
 
@@ -193,21 +192,15 @@ build-gentoo() {
 	"${EDITOR:-vim}" "$_optdest/etc/fstab"
 
 	# Now we need to pivot into a chroot and finish configuration natively
-	# Buuuut... since we're using systemd, we get to just spawn a systemd-nspawn container
 	popd
 	log "Pivoting to container for more setup"
 	cp "$0" "$_optdest/gentoostrap.sh"
-	for dir in proc sys dev; do
-		umount "$_optdest/$dir" || :
-	done
-	sudo systemd-nspawn --directory="$_optdest" /gentoostrap.sh -c
-
-	# The nspawn container sadly cannot manipulate the environment entirely, so we need to now do an ACTUAL chroot to install GRUB
 	mount --types proc /proc "$_optdest/proc"
 	mount --rbind /sys "$_optdest/sys"
 	mount --make-rslave "$_optdest/sys"
 	mount --rbind /dev "$_optdest/dev"
 	mount --make-rslave "$_optdest/dev"
+	chroot "$_optdest" /gentoostrap.sh -c
 	chroot "$_optdest" /gentoostrap.sh -d
 	log "Configuration complete! You should be good to reboot now."
 }
@@ -354,7 +347,7 @@ main() {
 	# TODO: That
 	# Validate core program dependencies
 	log "Validating dependencies" 2
-	if ! has basename chroot curl sha512sum systemd-nspawn tar; then
+	if ! has basename chroot curl sha512sum tar; then
 		error "Failed to find program: $_return" 1
 	fi