adding pv for progress bar for RAM loading

extra/pre-build.d/usr/lib/initcpio/hooks/archiso-custom

@@ -46,7 +46,8 @@ _mnt_sfs() {
 
     if [[ "${copytoram}" == "y" ]]; then
         msg -n ":: Copying squashfs image to RAM..."
-        if ! cp "${img}" "/run/archiso/copytoram/${img_fullname}" ; then
+        #if ! cp "${img}" "/run/archiso/copytoram/${img_fullname}" ; then
+        if ! pv -pterabT "${img}" > "/run/archiso/copytoram/${img_fullname}" ; then
             echo "ERROR: while copy '${img}' to '/run/archiso/copytoram/${img_fullname}'"
             launch_interactive_shell
         fi

extra/pre-build.d/usr/lib/initcpio/install/archiso-custom

@@ -13,6 +13,7 @@ build() {
     add_binary losetup
     add_binary mountpoint
     add_binary truncate
+    add_binary pv
 
     add_file /usr/lib/udev/rules.d/60-cdrom_id.rules
     add_file /usr/lib/udev/rules.d/10-dm.rules