use cp --reflink=auto

saves some space, if the destination is on the same filesystem on some
filesystems

50-dracut.install

@@ -12,7 +12,7 @@ case "$COMMAND" in
         if [[ -f ${INITRD_IMAGE_PREGENERATED} ]]; then
             # we found an initrd at the same place as the kernel
             # use this and don't generate a new one
-            cp "$INITRD_IMAGE_PREGENERATED" "$BOOT_DIR_ABS/initrd" \
+            cp --reflink=auto "$INITRD_IMAGE_PREGENERATED" "$BOOT_DIR_ABS/initrd" \
                 && chown root:root "$BOOT_DIR_ABS/initrd" \
                 && chmod 0600 "$BOOT_DIR_ABS/initrd" \
                 && exit 0

51-dracut-rescue-postinst.sh

@@ -57,7 +57,7 @@ if [[ ! -f $INITRDFILE ]]; then
 fi
 
 if [[ ! -f $NEW_KERNEL_IMAGE ]]; then
-    cp "$KERNEL_IMAGE" "$NEW_KERNEL_IMAGE"
+    cp --reflink=auto "$KERNEL_IMAGE" "$NEW_KERNEL_IMAGE"
     ((ret+=$?))
 fi
 

51-dracut-rescue.install

@@ -71,7 +71,7 @@ case "$COMMAND" in
 
         [[ -d "$BOOT_DIR_ABS" ]] || mkdir -p "$BOOT_DIR_ABS"
 
-        if ! cp "$KERNEL_IMAGE" "$BOOT_DIR_ABS"/linux; then
+        if ! cp --reflink=auto "$KERNEL_IMAGE" "$BOOT_DIR_ABS"/linux; then
             echo "Can't copy '$KERNEL_IMAGE to '$BOOT_DIR_ABS/linux'!" >&2
         fi