#!/usr/bin/bash -xe

# Prerequisites:
#
# - lpc55: install via `cargo install lpc55-host`
# - lfs: install via `yay -S littlefs2-fuse`
# - the bee needs to be in ROM bootloader
# - the mountpoint has to exist

fs=./bee.littlefs2
fs_offset=$((512 * 1024))  #  512K, start of 3rd PRINCE section
expected_fs_size=$((239 * 512))  # 119.5K, or 239 flash pages
mount=/mnt/bee
state=/tmp/bee-mount.state

# check no previous mount
if test -f $state; then
	set +x
	echo
	echo "File ${state} exists, this may indicate a mount already exists."
	echo "Clean up (scripts/defuse-bee), then try again."
	echo
	exit 1
fi

if [[ ! -d $mount ]]; then
	set +x
	echo
	echo "Mountpoint ${mount} does not exist."
	echo "Create it and make it user accessible (chown ${USER} ${mount})."
	echo
	exit 1
fi

# fetch the FS dump
lpc55 read-memory --output-file ${fs} ${fs_offset} ${expected_fs_size}
fs_size=$(stat -c%s ${fs})
if (( ${fs_size} != ${expected_fs_size} )); then
	exit 1
fi

# mount it
sudo modprobe loop
loop_device=$(sudo losetup --find --show ${fs})  # block size default is our 512B
sudo chmod a+rw ${loop_device}
# mkdir -p ${mount}
lfs ${loop_device} ${mount}
printf "loop_device=${loop_device}\nmount=${mount}" > ${state}
tree -h ${mount}