btrfs detection for grub and associated btrfs cleanup

lib/util-base.sh

@@ -435,7 +435,7 @@ install_grub_uefi() {
     [[ -f ${MOUNTPOINT}/usr/bin/grub_installer.sh ]] && rm ${MOUNTPOINT}/usr/bin/grub_installer.sh
         
     # If root is on btrfs volume, amend grub
-    [[ -e /tmp/.btrfsroot ]] && \
+    [[ $(findmnt -no FSTYPE ${MOUNTPOINT}) == "btrfs" ]] && \
         sed -e '/GRUB_SAVEDEFAULT/ s/^#*/#/' -i ${MOUNTPOINT}/etc/default/grub
 
     # Enble manjaro grub theme
@@ -615,7 +615,7 @@ bios_bootloader() {
                 [[ $(cat /tmp/.luks_dev) != "" ]] && sed -i "s~GRUB_CMDLINE_LINUX=.*~GRUB_CMDLINE_LINUX=\"$(cat /tmp/.luks_dev)\"~g" ${MOUNTPOINT}/etc/default/grub
 
                 # If root is on btrfs volume, amend grub
-                [[ $(lsblk -lno FSTYPE,MOUNTPOINT | awk '/ \/mnt$/ {print $1}') == btrfs ]] && \
+                [[ $(findmnt -no FSTYPE ${MOUNTPOINT}) == "btrfs" ]] && \
                   sed -e '/GRUB_SAVEDEFAULT/ s/^#*/#/' -i ${MOUNTPOINT}/etc/default/grub
 
                 # Same setting is needed for LVM 

lib/util-disk.sh

@@ -1317,17 +1317,15 @@ mount_partitions() {
         get_cryptroot
         echo "$LUKS_DEV" > /tmp/.luks_dev
         # If the root partition is btrfs, offer to create subvolumus
-        if [[ $(lsblk -lno FSTYPE,MOUNTPOINT | awk '/ \/mnt$/ {print $1}') == btrfs ]]; then
+        if [[ $(findmnt -no FSTYPE ${MOUNTPOINT}) == btrfs ]]; then
             # Check if there are subvolumes already on the btrfs partition
-            if [[ $(btrfs subvolume list /mnt | wc -l) -gt 1 ]] && DIALOG " The volume has already subvolumes " --yesno "\nFound subvolumes $(btrfs subvolume list /mnt | cut -d" " -f9)\n\nWould you like to mount them? \n " 0 0; then
+            if [[ $(btrfs subvolume list ${MOUNTPOINT} | wc -l) -gt 1 ]] && DIALOG " The volume has already subvolumes " --yesno "\nFound subvolumes $(btrfs subvolume list ${MOUNTPOUNT} | cut -d" " -f9)\n\nWould you like to mount them? \n " 0 0; then
                 # Pre-existing subvolumes and user wants to mount them
                 mount_existing_subvols
             else
                 # No subvolumes present. Make some new ones
-                DIALOG " Your root volume is formatted in btrfs " --yesno "\nWould you like to create subvolumes in it? \n " 0 0 && btrfs_subvolumes && touch /tmp/.btrfsroot
+                DIALOG " Your root volume is formatted in btrfs " --yesno "\nWould you like to create subvolumes in it? \n " 0 0 && btrfs_subvolumes
             fi
-        else 
-            [[ -e /tmp/.btrfsroot ]] && rm /tmp/.btrfsroot
         fi    
     fi