[archiso] simplify _mnt_fs() and _mnt_sfs()

mount is now from util-linux (like in e135003c

)
Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

archiso/hooks/archiso

@@ -30,15 +30,13 @@ _mnt_fs() {
     local img_fullname="${img##*/}";
     local img_name="${img_fullname%%.*}"
     local dm_snap_name="${dm_snap_prefix}_${img_name}"
-    local ro_dev ro_dev_size ro_dev_fs_type rw_dev
+    local ro_dev ro_dev_size rw_dev
 
     mkdir -p "${newroot}${mnt}"
 
     _next_loop_dev
     ro_dev=$(_make_loop_dev "${img}")
     ro_dev_size=$(blockdev --getsz ${ro_dev})
-    ro_dev_fs_type=$(blkid -o value -s TYPE -p ${ro_dev} 2> /dev/null)
-
 
     if [[ "${cow_persistent}" == "P" ]]; then
         if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then
@@ -61,8 +59,8 @@ _mnt_fs() {
 
     echo "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} 8" | dmsetup create ${dm_snap_name}
 
-    msg ":: Mounting '/dev/mapper/${dm_snap_name}' (${ro_dev_fs_type}) to '${newroot}${mnt}'"
-    if ! mount -t "${ro_dev_fs_type}" "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" ; then
+    msg ":: Mounting '/dev/mapper/${dm_snap_name}' to '${newroot}${mnt}'"
+    if ! mount "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" ; then
         echo "ERROR: while mounting '/dev/mapper/${dm_snap_name}' to '${newroot}${mnt}'"
         launch_interactive_shell
     else
@@ -89,7 +87,7 @@ _mnt_sfs() {
     fi
     _next_loop_dev
     msg ":: Mounting '${img}' (SquashFS) to '${mnt}'"
-    if ! mount -r -t squashfs $(_make_loop_dev "${img}") "${mnt}" &> /dev/null ; then
+    if ! mount -r $(_make_loop_dev "${img}") "${mnt}" &> /dev/null ; then
         echo "ERROR: while mounting '${img}' to '${mnt}'"
         launch_interactive_shell
     fi