chroot on a reMarkable into /opt

remarkable-chroot.sh

opkg install busybox bash
ln -fs /bin/bash /opt/bin/sh
mkdir -p /mnt/ramdisk
mount -t tmpfs -o size=64m tmpfs /mnt/ramdisk
pushd /mnt/ramdisk
mkdir dev proc sys run opt
mount -t proc /proc proc/
mount -o bind /sys sys/
mount -o bind /dev dev/
mount -o bind /run run/
mount -o bind /opt opt/
\ls opt | while read name;do mkdir -p $name;mount --bind /opt/$name $name/;done
chroot . bin/bash
popd
/bin/umount -R /mnt/ramdisk