Compress on-the-fly

build-image.sh

@@ -238,7 +238,6 @@ rm -rf ${FILES_TO_DELETE}
 mkdir /home
 mkdir /var
 mkdir /frzr_root
-mkdir /nix
 EOF
 
 # copy files into chroot again
@@ -264,8 +263,15 @@ fi
 echo "Free space"
 df -h
 
+IMG_FILENAME="${SYSTEM_NAME}-${VERSION}.img.xz"
+
 btrfs subvolume snapshot -r ${BUILD_PATH} ${SNAP_PATH}
-btrfs send -f ${SYSTEM_NAME}-${VERSION}.img ${SNAP_PATH}
+
+if [ -z "${NO_COMPRESS}" ]; then
+	btrfs send ${SNAP_PATH} | xz -9 -T0 > ${IMG_FILENAME}
+else
+	btrfs send -f ${SYSTEM_NAME}-${VERSION}.img ${SNAP_PATH}
+fi
 
 cp ${BUILD_PATH}/build_info build_info.txt
 
@@ -275,13 +281,8 @@ umount -l ${MOUNT_PATH}
 rm -rf ${MOUNT_PATH}
 rm -rf ${BUILD_IMG}
 
-IMG_FILENAME="${SYSTEM_NAME}-${VERSION}.img.tar.xz"
 if [ -z "${NO_COMPRESS}" ]; then
-	proc=$(cat /proc/cpuinfo | grep processor | wc -l)
-	tar -c -I"xz -9 -T${proc}" -f ${IMG_FILENAME} ${SYSTEM_NAME}-${VERSION}.img
-	rm ${SYSTEM_NAME}-${VERSION}.img
-
-	sha256sum ${SYSTEM_NAME}-${VERSION}.img.tar.xz > sha256sum.txt
+	sha256sum ${IMG_FILENAME} > sha256sum.txt
 	cat sha256sum.txt
 
 	# Move the image to the output directory, if one was specified.