Mount a BTRFS partition and chroot into it

manjaro-chroot.sh

#!/bin/sh
# https://gist.github.com/KiLLeRRaT/c6e112fd61ebf0bcb865bc70f796e6b7

set -e

lsblk # FIND THE PARTITION NAME

echo "Enter the partition name: "
read PARTITIONNAME

cryptsetup luksOpen /dev/$PARTITIONNAME myvol
mkdir /mnt/myvol
mount -o subvol=@ /dev/mapper/myvol /mnt/myvol
mount /proc /mnt/myvol/proc --bind
mount /dev /mnt/myvol/dev --bind
mount /sys /mnt/myvol/sys --bind

echo "Do you have a separate boot partition? (y/n)"
read ANSWER
if [ "$ANSWER" = "y" ]; then
  echo "Enter the boot partition name: "
  read BOOTPARTITIONNAME
  mount /dev/$BOOTPARTITIONNAME /mnt/myvol/boot
fi

echo "Do you have a separate EFI partition? (y/n)"
read ANSWER
if [ "$ANSWER" = "y" ]; then
  echo "Enter the EFI partition name: "
  read EFIPARTITIONNAME
  mount /dev/$EFIPARTITIONNAME /mnt/myvol/boot/efi
fi

chroot /mnt/myvol

#vim /etc/default/grub
#update-grub