fs: waste less storage building Fedora

fs/build

@@ -93,20 +93,18 @@ case "$ROOTFS" in
 				IMAGE_URL="https://download.fedoraproject.org/pub/fedora-secondary/releases/35/Spins/aarch64/images/Fedora-Minimal-35-1.2.aarch64.raw.xz"
 			;;
 		esac
-		if [ ! -f "Fedora-$ARCH_FED.ext4" ]; then
-			# rootfs is 3rd partiton of raw image
+		if [ ! -f "fedora-$ARCH_FED.raw" ]; then
 			wget $IMAGE_URL -O fedora-$ARCH_FED.raw.xz
-			xz -vdk fedora-$ARCH_FED.raw.xz
-			IMAGE_LOOP=$(losetup -f -P fedora*.raw --show)
-			dd if=${IMAGE_LOOP}p3 of=Fedora-$ARCH_FED.ext4 status=progress
-			losetup -d $IMAGE_LOOP
+			xz -vd fedora-$ARCH_FED.raw.xz
 		fi
-		# TODO: write rootfs image to rootpart instead of copying over files
+		# rootfs is 3rd partiton of raw image
+		IMAGE_LOOP=$(losetup -f -P fedora-$ARCH_FED.raw --show)
 		mkdir -p fedorarootfsimg
-		mount Fedora-$ARCH_FED.ext4 fedorarootfsimg/
+		mount ${IMAGE_LOOP}p3 fedorarootfsimg/
 		cp -a fedorarootfsimg/* $CADMIUMROOT/tmp/root
 		for x in {1..3}; do sed -i '$d' root/etc/fstab; sleep 1; done # remove / , /boot, /boot/efi from fstab
 		umount fedorarootfsimg/
+		losetup -d $IMAGE_LOOP
 	;;
 	# let's explain this: when void is set, $V is set to -v, so it does 'grep -v musl', printing link without musl
 	# when $V is not set, grep is 'grep musl', printing only link with musl